A Piezoelectric Screw Pump for Precision Liquid Transfer

Abstract

The invention discloses a piezoelectric screw pump for precision liquid transmission, belonging to the technical field of piezoelectric screw pump and fluid-solid coupling. Including screw pump and drive mechanism. The screw pump includes a screw and a threaded pipe that are clearance-fitted by a rectangular thread, and the threaded pipe is provided with an inlet and an outlet. The driving mechanism includes a pair of piezoelectric vibrators in the same plane, that is, a horizontal piezoelectric vibrator and a vertical piezoelectric vibrator; the horizontal piezoelectric vibrator and the vertical piezoelectric vibrator have the same structure, and the piezoelectric vibrator includes a pair of displacement amplifiers and a piezoelectric stack. The displacement amplifying piece is a diamond-shaped hollow frame piece, a pair of displacement amplifying pieces are connected in sequence, and the piezoelectric stack is fixedly arranged in one displacement amplifying piece. The drive mechanism is connected with the outer circumference of the annular hinge through a flexible hinge; the annular hinge is fixedly sleeved on the threaded pipe. A positive sinusoidal signal is supplied to the drive mechanism, and the threaded pipe is elliptically moved relative to the screw through the annular hinge, so that the gap between the screw and the threaded pipe changes to realize the transmission of liquid.

Description

technical field [0001] The invention belongs to the technical field of piezoelectric screw pump and fluid-solid coupling, in particular to a piezoelectric screw pump used for precise liquid transmission. Background technique [0002] The structure of the existing piezoelectric screw pump adopts a piezoelectric ceramic sheet as a driving device, and the output amplitude of the piezoelectric ceramic sheet is small, resulting in a low output power of the piezoelectric screw pump; the screw and the threaded tube are driven by conical thread meshing, and There is no fitting clearance between the screw and the threaded pipe. The output flow of the piezoelectric screw pump is completely determined by the output amplitude of the piezoelectric ceramic sheet. The output flow of the piezoelectric screw pump cannot be controlled by the structural changes of the screw and the threaded tube. Precise transfer control of liquids. There is no fixing device in the design structure. When the...

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Problems solved by technology

[0002] The structure of the existing piezoelectric screw pump uses piezoelectric ceramics as the driving device. The output amplitude of the piezoelectric ceramics is small, resulting in low output power of the piezoelectric screw pump; There is no fit clearance between the screw and the threaded pipe

The output flow of the piezoelectric screw pump is completely determined by the output amplitude of the piezoelectric ceramic sheet. The output flow of the piezoelectric screw pump cannot be controlled by the structural changes of the screw and the threaded tube, and the output flow of the screw pump cannot be deduced through theoretical formulas, which is difficult to achieve. Precise Transport Control of Liquids

There is no fixed device in the design structure. When the piezoelectric ceramics are working, both the screw and the threaded tube will vibrate, and the gap between the screw and the threaded tube is uncertain, resulting in unreliable performance of the piezoelectric screw pump. The piezoelectric ceramics The work efficiency of the tablet cannot be effectively utilized

[0003] The traditional screw pump works through the motor to drive the screw, and most of them use electromagnetic motors. The structure of the electromagnetic motor is complicated and the volume is large, which makes it difficult for the screw pump to be miniaturized.

The electromagnetic motor has no self-locking ability after power failure, which makes the traditional screw pump unable to guarantee the precision of liquid transmission

Traditional electromagnetic motors will produce electromagnetic pollution. In some occasions where electromagnetic interference is sensitive, traditional screw pumps cannot be directly applied.

Most of the traditional screw pumps have fixed steering, which can only pump liquid in one direction, and cannot achieve two-way pumping

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