The principle of the baffle door sealing fan is mainly based on the combination of aerodynamic and mechanical sealing. Here's a detailed explanation of how it works:
Aerodynamic principle: When air flows through the baffle door, according to Bernoulli's principle, a negative pressure zone will be formed at the edge of the baffle door, which makes the air flow speed faster and the pressure decrease. In this way, the surrounding air will flow towards the center of the flapper door where the flow rate is slower, resulting in a sealing effect.
Mechanical seal: Baffle doors typically employ a louvered double-layer baffle structure that first forms a mechanically sealed barrier on the flue section when the blades are in the closed position. This mechanically sealed barrier prevents most of the airflow and dust from passing through.
Sealed air system: On the basis of mechanical sealing, the baffle door sealing fan will also pass in the sealing air with a certain amount of pressure higher than the pressure of the working medium. This sealed air will form a high-pressure sealed air curtain wall around the baffle door, so that the blades are completely separated front and back, ensuring a higher partition effect.
Fan action: Sealed fan is a fan specially used for sealing air of coal mill and coal feeder of positive pressure direct blowing system. It drives the blades to rotate through a motor, creating an airflow that provides the flapper door with the required sealing air.
Regulation and adaptation: The baffle seal fan can be adjusted as needed to meet different working conditions. For example, the position of the baffle can be controlled by increasing or decreasing the air volume of the fan, thereby achieving adjustment of the inlet and outlet. Additionally, different types of gaskets can be replaced as needed to accommodate different gas or dust characteristics.
In summary, the baffle door sealing fan achieves effective isolation and sealing of airflow and dust by combining aerodynamic principles and mechanical sealing, as well as using the sealed air generated by the fan.