Metal powder producing apparatus and gas jet device for same

Patent metadata

Field	Value
Publication number	US-11298746-B2
Application number	US-201916719008-A
Country	US
Kind code	B2
Filing date	Dec 18, 2019
Priority date	Feb 4, 2019
Publication date	Apr 12, 2022
Grant date	Apr 12, 2022

Abstract

The metal powder producing apparatus includes: a first gas jet nozzle that includes jet holes disposed in a bottom surface of a gas jet device so as to form first rings each, and jets gas against molten metal flowing down through the liquid nozzles; a second gas jet nozzle that includes jet holes disposed in the bottom surface of the gas jet device so as to form second rings each on an outer side of a corresponding one of the first rings, and jets gas to prevent scatter of metal particles; and a third gas jet nozzle that includes jet holes disposed in the bottom surface of the gas jet device so as to form a third ring on an outer side of the second gas jet nozzle, and jets gas against an inner wall surface of the spray chamber.

First claim

What is claimed is:

1. A metal powder producing apparatus comprising:
a spray chamber;
a plurality of liquid nozzles causing a molten metal stored in a crucible to flow down into the spray chamber;
a gas jet device provided with a plurality of liquid nozzle insertion holes into each of which respective of the plurality of liquid nozzles are inserted;
a first gas jet nozzle including a plurality of first jet holes disposed in a bottom surface of the gas jet device in such a manner as to form first rings each around a corresponding one of the plurality of liquid nozzle insertion holes, gas jet directions of all the first jet holes pass through a first focus, the first gas jet nozzle jetting gas against the molten metal flowing down through the liquid nozzles to pulverize the molten metal;
a second gas jet nozzle including a plurality of second jet holes disposed in the bottom surface of the gas jet device in such a manner as to form second rings each on an outer side of a corresponding one of the first rings, gas jet directions of all the second holes pass through a second focus that is positioned below the first focus, the second gas jet nozzle jetting gas to prevent scatter of metal particles resulting from pulverization by the first gas jet nozzle; and
a third gas jet nozzle including a plurality of third jet holes disposed in the bottom surface of the gas jet device in such a manner as to form a third ring on an outer side of the second gas jet nozzle, axial directions of the third jet holes are set such that the gas jet direction of each third holes radially extends outward from a center of the third ring to a closest portion of an inner wall surface of the spray chamber, the third gas jet nozzle jetting gas against an inner wall surface of the spray chamber.

2. The metal powder producing apparatus according to claim 1 , further comprising:
a fourth gas jet nozzle including a plurality of jet holes disposed at a predetermined height in the spray chamber, the fourth gas jet nozzle jetting gas along an inner wall surface of the spray chamber to generate, in the spray chamber, a swirling flow around a center axis of the spray chamber.

3. The metal powder producing apparatus according to claim 2 , wherein
a plurality of the fourth gas jet nozzles are provided in a height direction in the spray chamber.

4. A gas jet device for a metal powder producing apparatus producing metal powder by jetting gas on a liquid, the gas jet device comprising:
a plurality of liquid nozzle insertion holes into which liquid nozzles causing a molten metal to flow down into a spray chamber are inserted;
a first gas jet nozzle including a plurality of first jet holes disposed in such a manner as to form first rings each around a corresponding one of the plurality of liquid nozzle insertion holes, gas jet directions of all the first jet holes pass through a first focus, the first gas jet nozzle jetting gas against the molten metal flowing down from the liquid nozzles to pulverize the molten metal;
a second gas jet nozzle including a plurality of second jet holes disposed in such a manner as to form second rings each on an outer side of a corresponding one of the first rings, gas jet directions of all the second holes pass through a second focus that is positioned below the first focus, the second gas jet nozzle jetting gas to prevent scatter of metal particles resulting from pulverization by the first gas jet nozzle; and
a third gas jet nozzle including a plurality of third jet holes disposed in such a manner as to form a third ring on an outer side of the second gas jet nozzle, axial directions of the third jet holes are set in such that the gas jet direction of each third holes radially extends outward from a center of the third ring to a closest portion of an inner wall surface of the spray chamber, the third gas jet nozzle jetting gas against an inner wall surface of the spray chamber.

Assignees

• Mitsubishi Power Ltd

Inventors

• Shibayama Takashi
• Imano Shinya
• Wang Yuting
• Eguchi Shigenobu

Classifications

• Y02P10/25

  Process efficiency · CPC title

• B22F9/082 Primary

  atomising using a fluid (using centrifugal force B22F9/10) · CPC title

• B22F2009/0824

  with a specific atomising fluid · CPC title

• B22F2009/088

  Fluid nozzles, e.g. angle, distance · CPC title

• B22F2999/00

  Aspects linked to processes or compositions used in powder metallurgy · CPC title