The working principle of the side channel blower is: when the impeller rotates, due to the centrifugal force, the wind vane causes the gas to move forward and outward, thereby forming a series of spiral movements. The air between the impeller blades rotates in a spiral shape and pushes the gas outside the pump body into the side groove (inhaled by the suction port). When it enters the side channel, the gas is compressed and then returned to the impeller blades again. Accelerate rotation. When air passes through the impeller and side grooves along a spiral track, each impeller blade increases the degree of compression and acceleration. As the rotation progresses, the kinetic energy of the gas increases, which further increases the pressure of the gas passing along the side channel. When the air reaches the connection point of the side groove and the discharge flange (side channel narrows at the outlet), the gas is pushed out of the blade and exits the pump body through the outlet muffler.

The Roots blower is a positive displacement. The air volume delivered is proportional to the number of revolutions. Each rotation of the three-blade impeller is performed by two impellers for three times of suction and exhaust. Compared with the two-blade type, the gas pulsation is less and the load changes. Small, high mechanical strength, low noise, and small vibration. There are two three-bladed impellers on the two parallel shafts. There is always a small gap between the wheel and the inner hole surface of the elliptical chassis and each of the impellers. Because the impellers rotate in opposite directions at a constant speed, the box body A certain amount of gas surrounded by the impeller is transported from the suction side to the discharge side. Each impeller is always maintained in the correct phase by the synchronous gear, and there will be no contact with each other, so it can be speeded up, does not require internal lubrication, and has a simple structure, smooth operation, stable performance, adaptable to multiple uses, and has been used in a wide range of field. The side channel blower and the Roots blower are very different, and the structure and working principle and working characteristics are different.