Selection of Roots blower, what problems should be considered when selecting and purchasing Roots blower

Shopping Roots Blower It is mainly selected according to the flow and pressure, and meets other requirements such as installation and noise. Generally, choose the form first, such as centrifugal or axial flow. Select the model again, mainly according to the flow, pressure head, whether to cut the blade, and the size of the motor. Finally, other requirements such as noise shall be met. First of all, it is necessary to analyze the requirements of the process for air: whether it is a constant flow air supply or a constant pressure air supply. Roots blower belongs to a constant flow fan. The main working parameter is the air volume. The output pressure changes with the changes of pipes and loads, and the air volume changes very little. Centrifugal fan belongs to constant pressure fan, and the main working parameter is air pressure. The output air volume changes with the change of pipeline and load, and the air pressure changes little. The flow, air pressure and power of roots blower are completely different from those of centrifugal blower. The flow of blower generally changes little, but the pressure changes greatly. When the pressure increases, the shaft power increases; When the pressure of centrifugal fan increases, the shaft power decreases. It is absolutely not allowed to reduce the air volume and air pressure by reducing the valve. A vent can be installed to adjust the air volume of the aeration tank.