An Externally Adjustable Radially Extended Annular Gap Combined Nozzle for Preparation of Nano-micron Materials by Supercritical Fluid

Abstract

The invention relates to the field of preparation of nano / micro-materials, and particularly relates to an external adjustable radial expanding annular space combined nozzle for supercritical fluid prepared nano / micro-materials. The external adjustable radial expanding annular space combined nozzle is composed of a nozzle core, a conical end sleeve, a core adjusting cylinder, a sleeve adjusting cylinder, a spherical face sleeve, a main adjusting ring, a secondary adjusting ring, a crystallizer end part, a sealing ring, a roll bead, a fluid connecting pipe, a fastening bolt, an adjusting ring locking nut, a spherical face sleeve locking nut and a limiting screw. According to the requirement of the preparation technique of the supercritical fluid prepared nano / micro-materials, above members are selected to assemble a single-channel combined nozzle or a dual-channel inside or outside mixing combined nozzle or a three-channel inside or outside combined nozzle or a three-channel inside outside or outside inside mixing combined nozzle. The external adjustable radial expanding annular space combined nozzle reduces the processing cost, improves precision, uniformity of every annular gap ofthe nozzle and the nozzle dredging effect, realizes the external adjustment of the crystallizer of the nozzle annular gap, and eliminates the influence of increased annular gap distance caused by increase of annular gaps on the crystalizing process of the prepared material.

Description

technical field [0001] The invention relates to the field of nano-micron material preparation, in particular to an externally adjustable radially expanding annular gap combined nozzle for preparing nano-micron material with supercritical fluid. [0002] technical background [0003] Supercritical fluid preparation nano-micron material technology, or supercritical fluid crystallization or precipitation technology, is an effective technical means to prepare various nano-micron particles or ultrafine powders of materials with biological activity and heat sensitivity. The nozzle is a key component in the realization of this technical equipment. Conventional nozzles are made by laser drilling, mechanical drilling and capillary processing, which are not suitable for the preparation process of large-volume nano-micron materials, and cannot flexibly adjust the nozzles according to the requirements of nano-micron material output and preparation process; In addition, in the process of...

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Problems solved by technology

[0005] The main defects in the above-mentioned patents are: either the size of the ring gap cannot be adjusted outside the crystallizer, or although the size of the ring gap can be adjusted outside the mold, the expansion of the number of ring gaps must be carried out along the axial direction, so that the gap between The distance of the nozzle increases, which affects the crystallization process of the prepared material; in addition, there is a common problem that the machining accuracy of the nozzle parts is high, and it is difficult to ensure the uniformity of the annular gap along the circumferential direction.

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