A Diffusion-Contraction Dual-cavity Parallel Wall Jet Valveless Piezoelectric Micropump

Abstract

The invention discloses a valveless piezoelectric micro-diffusion-contraction double-cavity parallel wall-attached jet in the field of microfluidics. The right side of the lower half of the second pump chamber is connected to the small end of the second conical converging pipe, the large end of the first conical converging pipe is respectively connected to the first rear diverging straight pipe and the first front diverging straight pipe, and the large end of the second converging conical pipe is The first and second rear straight pipes are connected to the front end of the inlet diffusion / contraction tube, and the rear end of the inlet diffusion / contraction tube is connected to the inlet buffer chamber. 1. The second front split straight pipe is connected to the rear end of the outlet diffusion / contraction pipe, and the front end of the outlet diffusion / contraction pipe is connected to the outlet buffer chamber. The double chamber parallel connection is adopted to increase the kinetic energy of the pumped fluid, so that the micropump The backpressure performance at the outlet is improved.

Description

Technical field [0001] The present invention relates to the field of microfluidic technology, and in particular, the structure of the valve piezoelectric micropump is a core component and power component of the microfluidic system. Background technique [0002] The piezoelectric pump is one of the reciprocating membrane micropump, and the plastic deformation of the piezoelectric material is achieved by utilizing the inverse pressure electrical effect of the piezoelectric material, and the volume of the pump chamber is changed, thereby achieving the purpose of the conveying fluid. Compared to micropumps of other driving methods, the piezoelectric pump has the advantages of simple structure, small size, fast in response, large actuation force, no electromagnetic interference, viscosity, ionic strength, acid and alkaline, etc., therefore It is widely used in chemical analysis, biocon chips and other fields. [0003] The attachment of the wall is also known as the Coanda, which is th...

AI Technical Summary

Problems solved by technology

However, with the development of science and technology, in more and more occasions (such as heart pumps), micropumps are required to pump fluids with large kinetic energy, that is, they have good back pressure performance, and multi-cavity series micropumps It can only increase the flow rate of the pump. For example, a series valveless piezoelectric pump is mentioned in the document of Chinese Patent No. CN104500373A, which only improves the outlet flow rate, but does not affect the back pressure performance of the micropump. little improvement

Images