Blower is a kind of general machinery used for conveying gas or gas mixture. According to the different working principles, blowers can be divided into two categories, respectively, positive displacement and centrifugal, of which as for positive displacement, we mainly use Roots blowers and screw blowers. As for centrifugal, the most common are multi-stage centrifugal fans, single-stage centrifugal fans and gear growth blowers.

Roots blower is a volumetric rotary blower, its advantages are low noise, uniform gas supply, so it has been widely used in many industrial fields. The multi-stage centrifugal blower has the disadvantages of large volume, heavy mass and poor flow regulation performance, so its use will be limited in some specific application scenarios, such as large industrial equipment.

Single-stage gear blower adopts three-way flow design theory, and its efficiency is greatly improved, so it is widely used in some application scenarios that require high efficiency, such as air purification equipment. The air suspension blower uses dynamic pressure air suspension bearings to achieve rotating shaft suspension, without lubrication, energy saving of more than 30%, noise of about 80 decibels, so it is widely used in some application scenarios that require energy saving and low noise, such as medical equipment. The magnetic suspension blower uses active magnetic suspension bearings to achieve rotor suspension, without lubrication, energy saving of more than 30%, noise of about 80 decibels, so it is widely used in some application scenarios requiring energy saving and low noise, such as aerospace equipment.