Electric hot air drying oven (also known as electric hot constant temperature air drying oven) is a universal laboratory/industrial equipment that uses electric heating elements to generate heat, combined with an air circulation system to achieve constant temperature drying, baking, curing, sterilization or preheating of items. It is widely used in scientific research, electronics, food, chemical industry and other fields.
Its working logic revolves around the design of "accurate temperature control+uniform heating", and the core process is as follows:
Heating stage: The electric heating tube (commonly stainless steel heating tube) inside the box generates heat after being powered on, directly heating the air inside the box;
Cycle stage: The built-in blower motor drives the fan to rotate, forcefully blowing the heated hot air to various corners inside the box, forming a "hot air cycle" to avoid local temperature unevenness;
Temperature control stage: The temperature sensors inside the box (such as platinum resistors and thermocouples) monitor the temperature in real time. When the temperature reaches the set value, the controller automatically cuts off the power supply to the heating tube; When the temperature is lower than the set value, re energize and heat to ensure that the temperature inside the box is stable within the target range (the temperature control accuracy can usually reach ± 1 ℃~± 3 ℃);
Exhaust stage: Some models are equipped with adjustable exhaust valves, which can discharge moisture or harmful gases evaporated during the drying process, improve drying efficiency, and protect samples.
Working principle and system composition
Heating system: using electric heating tubes or wires as heat sources, accurately adjusting power through PID intelligent control instruments to achieve temperature stability control. The temperature sensor monitors the temperature inside the box in real-time and provides feedback to the control system for dynamic adjustment.
Blowing circulation system: The centrifugal impeller and guide duct work together to force hot air to circulate inside the box, ensuring temperature uniformity (within ± 2 ℃). Vertical or horizontal air supply design is suitable for different material drying needs, avoiding local overheating or uneven drying.
Ventilation system: The exhaust and intake ports dynamically balance the air pressure inside the box, timely discharge moisture and steam, and maintain a dry environment.
Security protection system
Overtemperature alarm device: automatically cuts off power when the temperature exceeds the set value to prevent equipment or sample damage.
Temperature limit protection: Dual safety mechanism ensures safe operation.