The pump body structure of gear pump principle

With the continuous deepening of research and improvement on gear pumps, variations of pump body structures based on gear pump principles continue to emerge. Cycloid internal meshing gear pump is an early type that uses a pair of conjugate cycloidal gears as working components, together with the pump body and auxiliary components, to form a volume change space. Subsequently, helical gear pumps emerged, which have higher working stability than spur gear pumps. In recent years, the concept of multi gear pumps has been proposed and several forms have been developed to improve work efficiency. The balanced composite gear pump is one of the research hotspots, which has the advantages of significantly increasing displacement and output power, reducing flow pulsation, and achieving radial force balance. But its structure is complex, its volume is large, and its cost is high. Many papers have been published to address the phenomenon of trapped oil in gear pumps, proposing several improvement measures, such as: