Plunger pump driven by piezoelectric chip vibrators

Abstract

The invention relates to a plunger pump driven by piezoelectric chip vibrators and belongs to the field of fluid driving control. A pump cover installed at the end of a cavity and a piston installed inside the cavity from a pump cavity body; piezoelectric vibrator bodies are installed on a connection block fixed to the end of a piston rod, and the two ends of each piezoelectric vibrator body are fixed to a left wall plate and a right wall plate; the vibrator bodies are each of a straight structure before being installed and are each of a bent structure after being installed; pressure stress is applied to piezoelectric chips; the parts, on the left side and the right side of the connection block, of the piezoelectric vibrator bodies form a first driving unit and a second driving unit, and the driving voltage phase difference of the two driving units is 180 degrees; and when the elongation amount of the piezoelectric vibrator bodies reaches the maximum in one driving unit, the shortening amount of the piezoelectric vibrator bodies reaches the maximum in the other driving unit, and the shortening amount and the elongation amount are restricted with each other. The plunger pump driven by the piezoelectric chip vibrators has the characteristics and advantages that a telescopic piezoelectric actuator is formed through the installation method, the manufacturing method and process are simple and low in cost; only the pressure stress is applied to the piezoelectric chips, the deformation of the first driving unit and the deformation of the second driving unit are restricted with each other, and the reliability is high; and the flow and pressure of the pump are easy to improve by increasing the number and the length of the piezoelectric vibrators.

Description

technical field [0001] The invention belongs to the field of fluid drive and control, in particular to a plunger pump driven by a piezoelectric wafer vibrator. Background technique [0002] Piezoelectric crystal pump has many advantages such as simple structure, small size, fast response, no electromagnetic interference, easy operation, good flow and pressure controllability, and is widely used in the fuel supply of medical treatment, chemical analysis, aerospace, automotive engines and fuel cells , 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 wafer pumps with various structures have been proposed. Although the structural forms and performances of the existing piezoelectric wafer pumps are quite different, they all use the bending deformation of the wafer-s...

AI Technical Summary

Problems solved by technology

Most of the existing piezoelectric wafer pumps are driven by circular piezoelectric vibrators, and their output flow and pressure are low, so they can only be used in low-pressure and micro-flow occasions; Piezoelectric wafers are subjected to alternating tension-compression stress, so they are easily damaged due to excessive deformation, low reliability, and cannot increase the output flow and pressure by increasing the scale and number of piezoelectric vibrators and driving voltage

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