Stop block type wall-attached jet valveless piezoelectric minipump

Abstract

The invention discloses a stop block type wall-attached jet valveless piezoelectric minipump and belongs to the field of microfluid systems. A lower pump cavity is connected with the left end of a wall-attached portion. The right end of the wall-attached portion is connected with a first pump inlet buffering cavity through a first inlet direct-flow pipe, connected with a second pump inlet buffering cavity through a second inlet direct-flow pipe and connected with a pump outlet buffering cavity through an outlet direct-flow pipe correspondingly. The wall-attached portion is composed of a buffering cavity, a converging conical pipe and a stop block. The left end of the buffering cavity communicates with the lower pump cavity. The right end of the buffering cavity communicates with the small end of converging conical pipe. The large end of the converging conical pipe communicates with the left end of the first inlet direct-flow pipe, the left end of the second inlet direct-flow pipe and the left end of the outlet direct-flow pipe. The stop block is arranged right in the middle of the small end of the converging conical pipe. The flow channel at the small end of the converging conical pipe is divided into a front narrow flow channel and a back narrow flow channel which are identical. The stop block is composed of a left semi-cylinder and a right triangular prism, wherein the front side wall and the back side wall of the triangular prism are tangent to the semi-cylinder. The stop block is used for inducing fluid to flow in a wall-attached manner, the net flow of discharging of an outlet is increased, and the volume efficiency is improved.

Description

technical field [0001] The invention relates to the field of microfluidic systems, in particular to a valveless piezoelectric micropump structure, which is the core component and power element of the microfluidic system. Background technique [0002] The performance of the micropump directly determines the performance of the microfluidic system. Piezoelectric pump is a kind of reciprocating diaphragm micropump, which realizes the conversion of electrical energy into mechanical energy by using the inverse piezoelectric effect of piezoelectric materials, so as to achieve the purpose of transporting fluid. Compared with micropumps with other drive methods, piezoelectric pumps have the advantages of simple structure, small size, fast response, large actuation force, no electromagnetic interference, and insensitivity to the viscosity, ionic strength, and acidity and alkalinity of the conveying medium. It is widely used in chemical analysis, cooling of electronic devices, environ...

AI Technical Summary

Problems solved by technology

However, it is difficult to obtain a large difference in flow resistance by changing the structural parameters of the flow tube, which leads to the low volumetric efficiency of most valveless piezoelectric pumps of this type.

In order to generate a larger flow resistance difference and obtain higher volumetric efficiency, many micropumps with new structures have appeared. For example, a three-cavity valveless piezoelectric pump based on the Coanda effect is proposed in the document of the Chinese Patent Publication No. CN203248339U , three pump chambers are designed to control the flow rate and flow direction by controlling the amplitude of different pump chambers, but the three pump chambers make the structure occupy more space, increase the processing cost, and the application occasions are also limited, which is not conducive to miniaturization In addition, the characteristics of ideal control of flow direction have not been achieved in practical applications; Chinese Patent Publication No. CN102913422A proposes a valveless piezoelectric pump with choke body and flow resistance, and many choke bodies are designed at the bottom of the pump chamber , although it can save space, this kind of micropump can hardly bear the back pressure, and the actual application effect is not ideal

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