Electric Field Driven Droplet Jetting Nozzle Based on Pyroelectric Effect

Abstract

The invention discloses an electric field driving type micro-drop jetting spray head based on the pyroelectric effect. The jetting spray head comprises a storage cylinder, a nozzle, a pyroelectric crystal ring, a heating ring and a shell, the nozzle is arranged below the storage cylinder, the nozzle is conical, a space within the storage cylinder and the nozzle is insulated from the outside, the pyroelectric crystal ring is of an annular structure, is installed on the shell and located right below the nozzle, the outer ring surface of the pyroelectric crystal ring and a jetting liquid in the storage cylinder are equipotential, the heating ring is located on the periphery of the pyroelectric crystal ring, and is used for heating the pyroelectric crystal ring, and the shell is fixed on the outer side of the storage cylinder in a sleeving mode. According to the electric field driving type micro-drop jetting spray head, on one hand, a lot of problems caused by high voltage and complex circuits required by direct applying of an external electric field can be avoided, and on the other hand, the problem of influence of the size of a gap between the pyroelectric crystal and a jetting device on the stability of the jet printing process can be solved.

Description

technical field [0001] The invention relates to the technical field of additive manufacturing and droplet ejection, in particular to an electric field-driven droplet ejection nozzle based on pyroelectric effect. Background technique [0002] The droplet ejection device can be applied to many fields such as micro-electro-mechanical system manufacturing technology, electronic packaging technology, display manufacturing technology, and ink-jet printer technology. At present, droplet ejection devices can be generally divided into "push" ejection and "pull" ejection according to their ejection principles. The "push" type injection is to eject the liquid in the injection chamber by driving the diaphragm, etc., and its structure is relatively simple. The "pull" jetting is a jetting method driven by an electric field, also known as electrojet printing, which can achieve nanoscale resolution, but in electrojet printing technology, the electric field is usually driven by an external ...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a pyroelectric effect-based electric field-driven micro-droplet ejection nozzle, which can avoid many problems caused by directly applying the high voltage and complicated circuits required by the external electric field on the one hand. It can solve the problem of the influence of the gap size between the pyroelectric crystal and the spraying device on the stability of the printing process

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