Hot air circulation oven types and air supply methods

Hot air circulation ovens generally have heating tubes and a circulating fan. Regardless of the oven's structure or whether the airflow is horizontal or vertical, hot air circulates throughout the oven. Therefore, they are generally referred to as hot air circulation ovens. Examples include electric blower ovens and double-door high-temperature sterilization ovens.

The air circulation system of a hot air circulation oven uses a fan-driven circulation system, ensuring uniform and efficient air circulation. The air is driven by a circulating air motor (using a contactless switch), which drives a blower through the heater, discharging hot air through the duct into the oven chamber. The used air is then drawn back into the duct as the air source for further circulation and heating, ensuring uniform indoor temperature. If the temperature fluctuates due to door opening and closing, the air circulation system quickly resumes operation until the set temperature is reached.

When designing a hot air circulation oven, the most appropriate structure is determined based on the specific material. Generally speaking, we've summarized two main types of air duct design structures: vertical and horizontal. Each has its own advantages and suits different applications.

The vertical air supply pattern creates a circulating air duct between the working chamber and the heat exchange chamber, with air flowing from top to bottom or bottom to top. This design is particularly suitable for materials that don't require a baking tray, providing a more efficient drying solution. The horizontal air supply pattern creates airflow from the upper duct, with a convection wall between the insulation layer and the working chamber. This convection wall has slightly angled air leaks, creating a horizontal airflow from left to right or right to left. This design is particularly suitable for materials that require a baking tray as a storage container.