Atomizing nozzle and method for producing powder

Abstract

The invention relates to an atomizing nozzle for producing 3D printing powder. The atomizing nozzle comprises a nozzle body, wherein a flow guide pipe is arranged in the center of the nozzle body; a first annular atomizing chamber, a second annular atomizing chamber and a third annular atomizing chamber are arranged around a center line of the flow guide pipe in the nozzle body from inside to outside; air feeding tubes are arranged on the first annular atomizing chamber, the second annular atomizing chamber and the third annular atomizing chamber; the first annular atomizing chamber, the second annular atomizing chamber and the third annular atomizing chamber are correspondingly connected with a first injecting chamber, a second injecting chamber and a second injecting chamber; the area of air inlets of the injecting chambers is less than that of air outlets of the injecting chambers; the annular atomizing chambers and the injecting chambers form Laval tubes; the distance from the air inlets of the injecting chamber to the center line of the flow guide pipe sequentially increases from inside to outside. The atomizing nozzle is high in production efficiency; the powder is high in degree of sphericity; the particle size of a product is adjustable; a powder product with a certain particle size distribution can be produced as requirement, so that the workload of after-treatment in powder production can be decreased.

Description

technical field [0001] The invention belongs to the field of powder preparation, and in particular relates to an atomizing nozzle and a method for producing powder. Background technique [0002] The gas atomization pulverization method is an important method for preparing metal and alloy powders. Its basic principle is the process of crushing liquid metal into small liquid droplets and solidifying into powder with high-speed airflow. The core is to control the process of gas on the metal liquid flow. , so that the kinetic energy of the airflow can be converted into the surface energy of the nascent powder to the greatest extent. Therefore, the atomization nozzle, as a control component, becomes the key technology of gas atomization, and the structure and performance of the nozzle determine the performance and efficiency of the atomized powder. [0003] The gas atomization powder making method is also widely used in the preparation and production of metal powder for 3D print...

AI Technical Summary

Problems solved by technology

In terms of sphericity, the metal powder prepared by laminar flow atomization method and ultrasonic atomization method has a certain gap in sphericity compared with the tightly coupled restrictive nozzle, and the powder morphology and special-shaped powder morphology produced by different nozzle structures are also different. Difficult to sieve during production

Moreover, part of the structure needs to be dismantled when the patented nozzle is used, which is no different from replacing the whole atomizing nozzle in the production process, and cannot improve production efficiency.

Images