Structure design and simulation of circular ring piezoelectric peristaltic pump

This paper aims to further explore the application of piezoelectric technology in peristaltic pump to made it further develop towards simple structure, small size and light weight and be used in broader areas. Combined with piezoelectric driven technology, the paper proposed a new type of circular ring piezoelectric peristaltic pump driven by circumferential traveling-wave based on the existing mechanical peristaltic pump structure. Its peristaltic stator is a ring and piezoelectric ceramic chips are bonded to the inner ring. Under the reactions of outer and inner rings, the stator produces peristalsis driven by circumferential traveling-wave along the torus, instead of the mechanical peristaltic pump which uses electromagnetic motor to drive eccentric pump to realize peristalsis. According to the elastic mechanics and vibration theory, the vibration formula was derived. The model of circular stator was built by using finite element analysis software, and the vibration mode in the circumferential direction and the driving mechanism were made by finite element analysis. Based on the consequences, the vibration mode of stator for circular ring piezoelectric peristaltic pump was confirmed, the whole structure was designed, and the working mechanism was simulated. The results show that the new type of piezoelectric peristaltic pump has both advantages of the mechanical peristaltic pump and the piezoelectric pump.