The QJB type submerged mixer is one of the key equipment in the water treatment process, capable of achieving uniform and flowing processes for both solid-liquid two-phase flow and solid-liquid-gas three-phase flow during biochemical reactions. It consists of a submerged motor, impeller, and installation system. The submerged mixer features a direct-drive structure. Compared to traditional high-power motors that use a reducer to reduce speed, it offers advantages such as compact structure, low energy consumption, and ease of maintenance. The impeller is precision cast or stamp-formed, featuring high accuracy, strong thrust, and a streamlined, aesthetically pleasing design.