US 11,020,796 B2Granted

Immersion-type burner heater and molten-metal holding furnace

AssigneeTounetsu Co., Ltd.

InventorsKiyata Mochizuki, Manabu Yamada

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Abstract

An immersion-type burner heater includes a heater protection tube that is installed so as to penetrate a furnace wall or an upper lid of the molten-metal holding furnace with the tip end thereof being closed; an inner cylindrical member arranged inside the tube so as to define a combustion flow passage S between the tube and itself with the tip end side thereof being open and the inside thereof serving as an exhaust gas flow passage; and a gas burner part supplying fuel gas and air to the combustion flow passage. A helically extending projecting part is provided on at least one of the outer peripheral surface of the member and the inner peripheral surface of the tube at a position that is closer to its tip end side than to the part penetrating the furnace wall or the upper lid.

Claims7

Dependent claims

An immersion-type burner heater, comprising:

a heater protection tube installed so as to penetrate a furnace wall or an upper lid of a molten-metal holding furnace with a tip end thereof being closed;
an inner cylindrical member arranged inside the heater protection tube so as to define a combustion flow passage between the heater protection tube and itself with the tip end side thereof being open and the inside thereof serving as an exhaust gas flow passage;
a gas burner part supplying fuel gas and air to the combustion flow passage;
and
a helically extending projecting part provided on an outer peripheral surface of the inner cylindrical member at a position that is closer to the tip end side of the inner cylindrical member than to a part penetrating the furnace wall or the upper lid;
and
a heat insulating member made of a heat insulating material having a lower heat conductivity than the heater protection tube and provided on a part of the outer peripheral surface of the inner cylindrical member where the projecting part is provided.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/332,905Filed 23 Oct 2017
Priority: JP JP2016-21163228 Oct 2016
Published: US 2019/0255605 A122 Aug 2019
Granted: 1 Jun 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification13 codes

B22D 18/04
Pressure casting; Vacuum casting: low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
F23M 9/08
Baffles or deflectors for air or combustion products ; Flame shields: helical or twisted baffles or deflectors
B22D 41/015
Heating means: with external heating, i.e. the heat source not being a part of the ladle
B22D 45/00
Equipment for casting, not otherwise provided for