A coaxial nozzle for electrofluid jet printing

Abstract

The invention discloses a coaxial nozzle for electrofluid spray printing. The coaxial nozzle comprises an outer nozzle and an inner nozzle. An axle hole is formed in the bottom of the outer nozzle and is connected with a connecting seat in a sleeved manner, an axial stepped hole is formed in the connecting seat, a base of the inner nozzle is sleeved in the stepped hole, a centring support is sleeved in the inner barrel, close to one side of the spout, of the outer nozzle, one end of an inner spraying needle is fixed on the base of the inner nozzle while the other end of the same penetrates a positioning through hole of the centring support to be fixed, a piezoelectric ceramic driver is connected to the outer wall of the connecting seat in a sleeved manner and is fixedly connected with an outer spraying barrel. The relative height of the inner nozzle and the outer nozzle can be precisely adjusted through the piezoelectric ceramic driving device, relative flow rate of different fluid in the inner and outer layers can be precisely controlled, the structural thickness of each 'shell' layer of coaxial spinning can be more precisely controlled, and coaxial centring precision of the inner and outer nozzles can be improved by the arrangement of the centring support.

Description

technical field [0001] The invention relates to a coaxial nozzle device, in particular to a coaxial nozzle used for preparing multi-layer nanofibers and multi-layer composite droplets by electrofluid jet printing. Background technique [0002] Electrofluidic jet printing is an important method for preparing multilayer nanofibers and multilayer composite droplets. The electrofluid jet printing method adopts the coaxial nozzle device of the sleeve type needle, sprays two or more different polymer solutions through the coaxial nozzle, and obtains a uniform, long-sized multilayer with a "shell-core" structure. coaxial nanofibers, or to obtain multilayer composite droplets with a "shell-core" structure. Multilayer composite droplets and / or "hollow powder" structured fibers have great potential in the fields of microfluidics, optoelectronics, and energy storage, and a large number of devices are yet to be developed. [0003] Coaxial nanofibers prepared by current jet printing in...

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to overcome the relative heights of the inner and outer nozzles in the coaxial nozzles of the electrofluid jet printing in the prior art, the non-replaceable nozzle structure cannot realize the adjustment of the solution flow rate, and the replaceable nozzle structure is difficult to process. For defects and deficiencies such as low precision, a new type of coaxial nozzle for electrofluid jet printing is provided. The relative height of the inner and outer nozzles can be precisely adjusted through the piezoelectric ceramic drive device to achieve precise control of the relative flow of different solutions in the inner and outer layers. And through the setting of the centering bracket structure, the coaxial centering accuracy of the inner and outer nozzles is improved, and the fixing effect of the inner spray needle is strengthened

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