Sliding nozzle

Patent metadata

Field	Value
Publication number	US-11235384-B2
Application number	US-201716475174-A
Country	US
Kind code	B2
Filing date	Dec 8, 2017
Priority date	Jan 5, 2017
Publication date	Feb 1, 2022
Grant date	Feb 1, 2022

Abstract

In a sliding nozzle comprising three plates consisting of an upper plate, an intermediate plate capable of a sliding movement, and a lower plate, it is intended to suppress adhesion and deposition of metal oxides and others on wall surfaces of inner bores of the three plates. The intermediate plate has: a first inclined portion whose surface defines a slidingly closing directional leading-side wall surface of an inner bore thereof and extends obliquely downwardly in a diametrically contracting direction; a second inclined portion whose surface defines an upper part of a slidingly closing directional trailing-side wall surface of the inner bore thereof and extends obliquely downwardly in a diametrically contracting direction, and a third inclined portion whose surface defines a lower part of the slidingly closing directional trailing-side wall surface of the inner bore thereof and extends obliquely downwardly in a diametrically expanding direction.

First claim

The invention claimed is:

1. A sliding nozzle for controlling a flow rate of molten steel, comprising three plates consisting of an upper plate, an intermediate plate capable of a sliding movement, and a lower plate, wherein the intermediate plate has: a first inclined portion whose defines a slidingly closing directional leading-side wall surface of an inner bore thereof and extends obliquely downwardly in a direction away from the leading-side wall surface; a second inclined portion whose surface defines an upper part of a slidingly closing directional trailing-side wall surface of the inner bore thereof and extends obliquely downwardly in a direction away from the trailing-side wall surface, and a third inclined portion whose surface defines a lower part of the slidingly closing directional trailing-side wall surface of the inner bore thereof and extends obliquely downwardly in a direction towards the trailing-side wall surface.

2. The sliding nozzle as recited in claim 1 , wherein the lower plate has a fourth inclined portion whose surface defines a slidingly closing directional leading-side wall surface of an inner bore thereof and extends obliquely downwardly in a direction away from the leading-side wall surface.

3. The sliding nozzle as recited in claim 1 , wherein respective sliding directional inner bore dimensions of the intermediate plate and the upper plate in a region where the intermediate plate and the upper plate are in sliding contact with each other satisfy the following relation: the inner bore dimension of the intermediate plate≥the inner bore dimension of the upper plate, and respective sliding directional inner bore dimensions of the lower plate and the intermediate plate in a region where the lower plate and the intermediate plate are in sliding contact with each other satisfy the following relation: the inner bore dimension of lower plate≥the inner bore dimension of the intermediate plate.

4. The sliding nozzle as recited in claim 1 , wherein a central axis of an inner bore of the upper plate or upper inner bore axis lies non-coaxially with a central axis of an inner bore of the lower plate or lower inner bore axis, wherein the lower inner bore axis is offset on the slidingly closing directional leading-side with respect to the upper inner bore axis.

5. The sliding nozzle as recited in claim 1 , which further comprises a refractory member installed to at least one of the upper plate and an upper nozzle located above the upper plate and configured to inject gas into an inner bore of the at least one of the upper plate and the upper nozzle.

Assignees

• Krosakiharima Corp
• Nippon Steel Corp

Inventors

• Fukunaga Shinichi
• Kawarada Kouji
• Tani Kohei
• Oikawa Masashi

Classifications

• B22D41/42

  Features relating to gas injection · CPC title

• B22D41/34

  Supporting, fixing or centering means therefor · CPC title

• B22D41/28 Primary

  Plates therefor (B22D41/38 - B22D41/42 take precedence) · CPC title

• B22D11/10

  Supplying or treating molten metal (B22D41/00 takes precedence) · CPC title

• B22D41/24 Primary

  characterised by a rectilinearly movable plate (B22D41/38 - B22D41/42 take precedence) · CPC title