Two-stage sandwich type traveling wave piezoelectric centrifugal pump and driving method thereof

Abstract

The invention discloses a two-stage sandwich type traveling wave piezoelectric centrifugal pump and a driving method thereof. The two-stage sandwich type traveling wave piezoelectric centrifugal pumpcomprises a base, a stator, a shell, an upper rotor, a lower rotor, a connecting shaft, a forward-closed impeller, a reverse-closed impeller, a first connecting pipe fitting, a second connecting pipefitting and four piezoelectric ceramic modules. During work, the four piezoelectric ceramic modules are excited to drive a particle on the inner side of annular teeth to perform micro-amplitude elliptical motion, the upper rotor and the lower rotor are driven to further drive positive and negative closed impellers to rotate in the same direction, fluid obtains energy for the first time through thelower closed impeller, and then enters the upper closed impeller through a pipeline to obtain energy for the second time, so that the fluid is pressurized twice. The bending type contraposition laminating suction device is simple and compact in structure, easy to seal and miniaturize, capable of accurately controlling flow, fast in response, low in noise, free of electromagnetic interference andelectromagnetic interference, and capable of powering off and self-locking; and compared with a conventional piezoelectric pump, the piezoelectric pump has the advantages of large flow and large output fluid pressure.

Description

technical field [0001] The invention relates to the field of fluid machinery, in particular to a two-stage sandwich traveling wave piezoelectric centrifugal pump and a driving method thereof. Background technique [0002] When the traditional centrifugal pump works, it needs to be driven by an external motor. In this way, the motor and the centrifugal pump are separated, so the structure is complex, and the volume is large and it is not easy to miniaturize; moreover, the fluid control accuracy of the centrifugal pump is not high, and it cannot supply small flow. It will generate a lot of noise; in addition, the operation of traditional motors will generate electromagnetic pollution, which will limit its direct application in fields sensitive to magnetic fields such as medical treatment and hygiene. [0003] Conventional piezoelectric pumps use the inverse piezoelectric effect of piezoelectric materials to deform the piezoelectric sheet to change the volume of the pump cavity...

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Problems solved by technology

[0002] When the traditional centrifugal pump works, it needs to be driven by an external motor. In this way, the motor and the centrifugal pump are separated, so the structure is complex, and the volume is large and it is not easy to miniaturize; moreover, the fluid control accuracy of the centrifugal pump is not high, and it cannot supply small flow. It will generate a lot of noise; in addition, the operation of traditional motors will generate electromagnetic pollution, which will limit its direct application in fields sensitive to magnetic fields such as medical care and hygiene

[0003] Conventional piezoelectric pumps use the inverse piezoelectric effect of piezoelectric materials to deform the piezoelectric sheet to change the volume of the pump cavity and realize liquid transmission. There are problems such as low output pressure and low output flow, which make its applicable range The reception is greatly limited, so increasing the output flow and output fluid pressure of the piezoelectric pump is a difficult problem for the current piezoelectric pump

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