Double-cavity valveless piezoelectric pump of tee joint structure

Abstract

The invention discloses a double-cavity valveless piezoelectric pump of a tee joint structure. An inlet cushioning cavity, an outlet cushioning cavity, an inlet flow pipe, two outlet flow pipes and the lower half parts of two pump cavities are arranged on a pump body. The inlet flow pipe is formed by a convergence taper pipe and two flow division taper pipes which are symmetrically arranged relative to the center line of the convergence taper pipe in a communicated mode. The convergence taper pipe of the inlet flow pipe is communicated with the inlet cushioning cavity, one ends of the two flow division taper pipes are communicated with the big end of the convergence taper pipe, and the other ends of the two flow division taper pipes are respectively communicated with one of the two pump cavities. One ends of the two outlet flow pipes are respectively communicated with one of the two pump cavities, and the other ends of the two outlet flow pipes are both communicated with the outlet cushioning cavity. The inlet cushioning cavity is communicated with a pump inlet, and the outlet cushioning cavity is communicated with a pump outlet. Two piezoelectric vibrators 3 are loaded with alternating voltage signals of the same phase respectively, the flowing discharge capacity of fluid in the forward direction is enhanced, the phenomena of separation of boundary layers and wall-attached flow due to flowing at a large taper angle and with high frequency are avoided, energy loss is lowered, and the efficiency of the valveless piezoelectric pump is improved.

Description

technical field

[0001] The invention relates to the field of microfluid transmission and control and micromechanical technology, in particular to a double-cavity valveless piezoelectric pump with a three-way structure. Background technique

[0002] Piezoelectric pump is a kind of mechanical micropump, which belongs to positive displacement pump. It is widely used in the fields of micro-transportation of drugs, cell separation, cooling of electronic products, micro-injection of fuel, chemical micro-analysis, and transition control of pipeline flow. At present, piezoelectric pumps are mainly divided into two types: valved piezoelectric pumps and valveless piezoelectric pumps. Valveless piezoelectric pumps have no movable valves, and have a simple structure, which is more suitable for miniaturization and miniaturization, and can meet the needs of high-frequency applications. Work requirements, overcome the shortcomings of valved piezoelectric pumps that cause noise when the flo...

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