A dual-oscillator self-excited pump

Abstract

The invention belongs to the field of microfluid transmission and control and particularly relates to a double-vibrator self-excited pump. A sensor is mounted in a pump body, upper and lower inlet valve cavities of the pump body and butterfly valves adhered to the valve cavities separately form upper and lower inlet valves while upper and lower outlet valve cavities and butterfly valve adhered tothe valve cavities separately form upper and lower outlet valves, and the butterfly valves are formed by adhering pressure rings, valve blocks and valve seats; pump covers are mounted on the upper andlower sides of the pump body and press and connect vibrators in the upper and lower cavities separately to upper and lower cavities of the pump body through seal rings, the vibrators in the upper andlower cavities are formed by adhering substrates and piezoelectric plates, and the sensor and the vibrators in the upper and lower cavities are connected to a power supply through different guide wire groups; the vibrators in the upper and lower cavities, the seal rings, the upper and lower inlet valves and the upper and lower outlet valves form parallel upper and lower pump cavities; the power supply outputs direct current voltage, and when the fluid pressure reaches an extreme value, the output voltage of the power supply and the transformation directions of the vibrators in the upper and lower cavities are reversed. The double-vibrator self-excited pump has the advantages that excitation frequency is formed automatically according to the change state of the fluid pressure of the pump cavity, and the valve is high in efficiency and high in output ability and control precision.

Description

technical field [0001] The invention belongs to the field of microfluid transmission and control, in particular to a double vibrator self-excited pump. Background technique [0002] As an important branch of piezoelectric actuators, piezoelectric pumps have the advantages of simple structure, small size, fast response, no electromagnetic interference, easy operation, and good flow / pressure controllability. And fuel cell fuel supply, micro-electro-hydraulic systems and other aspects have broad application prospects, and its research and development has attracted extensive attention from scholars all over the world. In order to meet the application requirements in different fields, piezoelectric pumps with various structures have been proposed. Although the structure and performance of the proposed piezoelectric pumps are quite different, they all use the bending deformation of the wafer-shaped piezoelectric vibrator under the action of an electric field to realize fluid driv...

AI Technical Summary

Problems solved by technology

However, in actual work, the output flow and pressure of the piezoelectric pump are greatly affected by the working conditions. The fluid viscosity, temperature and output pressure affect the resonant frequency of the pump by affecting the system damping. When the deviation of the set excitation frequency is large, the output flow and pressure of the pump will drop significantly

Therefore, the output performance of the piezoelectric pump at a fixed frequency is not ideal, and the accuracy of the output flow and pressure calculated according to the set driving voltage and frequency is also low

In addition, most of the existing piezoelectric pumps use cantilever beam stop valves, which have low rebound stiffness, poor flatness and cut-off effect, which seriously affect the output flow and pressure of the pump.

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