Supersonic atomizing nozzle with single-stage laval and hartmann combined structure

Abstract

The invention relates to a supersonic atomizing nozzle with a single-stage laval and hartmann combined structure. The supersonic atomizing nozzle comprises a liquid guide cavity, wherein a nozzle orifice is formed in the lower part of the liquid guide cavity; an annular high-pressure air inflow cavity is encircled around the liquid guide cavity; an air inlet channel is formed in the inner side wall of the high-pressure air inflow cavity; the high-pressure air inflow cavity is communicated with the nozzle orifice through the air inlet channel; the air inlet channel adopts a cross hartmann two-stage resonance tube structure which is formed from an inlet guide pipe, an outlet guide pipe, a first-stage resonance tube and a second-stage resonance tube which are communicated; the inlet guide pipe and the first-stage resonance tube are arranged on the same straight line; the outlet guide pipe and the second-stage resonance tube are arranged on the same straight line; the tail ends of the first-stage resonance tube and the second-stage resonance tube are sealed; the inlet guide pipe is a reducer pipe with characteristics of a laval pipe. Compared with the prior art the supersonic atomizing nozzle with the single-stage laval and hartmann combined structure disclosed by the invention has the advantages that the characteristics of the laval pipe and the cross hartmann resonance pipe are combined to form the air inlet channel with the annular ring structure, so as to obviously increase the nozzle atomizing efficiency, lower the diameter of the atomized particles and narrow the size distribution.

Description

technical field [0001] The invention relates to an atomizing nozzle, in particular to a supersonic atomizing nozzle with a single-stage fusion laval and hartmann structure. Background technique [0002] At present, with the development of modern powder metallurgy technology and high-performance powder metallurgy materials, as well as the development of advanced preparation technologies such as ball grid array packaging, metal injection molding, thermal spraying, and metal rapid prototyping 3D printing, more stringent requirements have been put forward for metal powders. Requirements, such as powder particle size and uniformity, fluidity and so on. Now, most of the powder market and technology applicable to these advanced preparation technologies are monopolized by foreign powder product companies, such as titanium alloy powder, aluminum alloy powder, magnesium alloy powder, stainless steel powder, etc., and their price is as high as that of conventional powder Metallurgy re...

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Problems solved by technology

However, judging from the domestic and foreign research reports that have been consulted, there is no nozzle style with both structures

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