The blower is mainly composed of the following six parts: motor, air filter, blower body, air chamber, base (and oil tank), drip nozzle. The blower operates eccentrically on the rotor offset in the cylinder, and changes the volume between the blades in the rotor slot to suck in, compress, and discharge air. During operation, the pressure difference of the blower is used to automatically send lubrication to the drip nozzle, and drip into the cylinder to reduce friction and noise, while keeping the gas in the cylinder from returning. This type of blower is also called a sliding vane blower.
The impeller is generally composed of four parts: wheel cover, wheel disc, blade, and shaft disc. The structure of the impeller is mainly welded and riveted. According to the different installation angles of the impeller outlet, it can be divided into three types: radial, forward and backward. The impeller is the most important part of the centrifugal fan. It is driven by the prime mover and is the heart of the centrifugal impeller machinery. It is responsible for the energy transmission process described by Euler's equation. The flow inside the centrifugal impeller is affected by the rotation of the impeller and the surface curvature. Flow, backflow and secondary flow phenomena make the flow in the impeller very complicated. The internal flow of the impeller directly affects the aerodynamic performance and efficiency of the entire stage and even the entire machine.
The volute is mainly used to collect the gas from the impeller. At the same time, it can convert the kinetic energy of the gas into the static pressure energy of the gas by moderately reducing the gas velocity, and guide the gas to leave the volute exit. As a fluid impeller machine, the blower is a very effective method to start with the study of its internal flow field to improve its overall performance and work efficiency. In order to understand the real flow conditions inside the centrifugal blower, the scholars improved the design of the impeller and the volute to improve performance and efficiency, and did a lot of basic theoretical analysis, experimental research and numerical simulation calculation for the centrifugal impeller and volute.
