JP2001248970A - Heat preserving system for molten metal holding furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate an inconvenience of indispensably causing a short lifetime of a molten metal holding furnace due to local heating of a molten metal of the furnace caused by a small thermal conductivity of a combustion gas of a preheated medium by using a gas burner as a heating means in the furnace. SOLUTION: The molten metal holding furnace A is disposed in a fluidized- bed furnace 10. In this case, the furnace A or the molten metal M is uniformly heated in the furnace 10 having high thermal conductivity of the preheated medium to prolong a lifetime of the furnace. Further, a fluidized-bed 2 of the furnace 10 is made of a far infrared generating substance. Thus, the furnace A and the metal M is heated from its interior, and further more uniform heating is realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat retaining device for a molten metal holding furnace, which is used in casting.

[0002]

2. Description of the Related Art Conventionally, this kind of heat retaining device is shown in FIG.
As shown in the figure, the crucible 20 in the molten metal holding furnace A is surrounded by a burner furnace 30. By heating the burner furnace 30 by the hot air of the gas burners 31, 31, the molten metal holding furnace A and thus the molten metal M are kept warm. I was

[0003]

However, in such a conventional heat retaining apparatus for a molten metal holding furnace, a preheating medium as a heating means is a gas burner 31 having a small thermal conductivity.
As a result, since the holding furnace A and hence the molten metal M are locally heated, the life of the holding furnace A must be shortened.

An object of the present invention is to eliminate these disadvantages.

[0005]

In order to achieve this object, a heat retaining apparatus for a molten metal holding furnace according to the present invention comprises:
Since the molten metal holding furnace is disposed in the fluidized bed furnace, the holding furnace and thus the molten metal are heated in the fluidized bed furnace having a high thermal conductivity of the preheating medium. As a result, the holding furnace and thus the molten metal are easily heated uniformly.

If the fluidized bed in the fluidized bed is made of a far-infrared ray generating material, the temperature of the holding furnace and thus the molten metal can be heated from the inside by the far-infrared ray effect. Things.

[0007]

FIG. 1 is a sectional view of a heat retaining apparatus for a molten metal holding furnace according to the present invention.

In FIG. 1, A is a molten metal holding furnace and 10 is a fluidized bed furnace thereof, which corresponds to the "heat keeping apparatus" of the present invention.
Reference numeral 11 denotes an upper end opening, which is formed on the upper surface of the fluidized bed furnace 10. Reference numeral 20 denotes a crucible, which is fitted into the upper end opening 11 of the fluidized bed furnace 10. The molten metal M is stored in the crucible 20. Numerals 12 and 12 denote supports, which support the crucible 20 in the fluidized bed 10.

A heating air supply port 14 is provided in the fluidized bed furnace.
It is provided at the lower end of 10. The heating air is supplied through the heating air supply port 14 into the fluidized bed furnace 10. Reference numeral 15 denotes a dispersion plate, which is provided at a lower portion of the fluidized bed furnace 10. The dispersion plate 15 supports the fluidized bed 2 and disperses the heated air flowing through the through holes 151, 151,... Into the fluidized bed 2 to heat the fluidized bed 2 to a high temperature. Here, the fluidized bed 2 is made of alumina, silica, zirconia, a mixture of alumina and silica, or a mixture of alumina, silica and zirconia.
５００500 μm. Therefore, the fluidized bed 2 has a high specific heat, and furthermore, it is easy to emit far-infrared rays. 16,16,
Are heated air bubbles which move upward in the fluidized bed 2. The upper part of the fluidized bed 2 in the fluidized bed furnace 10 has an air atmosphere.

[0010]

According to the heat retaining apparatus for a molten metal holding furnace according to the present invention, the molten metal holding furnace is disposed in the fluidized bed furnace, and thus the holding furnace and, consequently, the molten metal are heated in the fluidized bed furnace having a high heat conductivity of the preheating medium. As a result, the holding furnace and thus the molten metal are easily heated uniformly.

[0011] Therefore, by using the heat retaining device of the molten metal holding furnace, the holding furnace and the molten metal are uniformly heated, so that the life of the holding furnace can be extended.

If the fluidized bed in the fluidized bed is made of a far-infrared ray generating substance, the holding furnace and thus the molten metal can be heated from the inside by the far-infrared ray effect. Things.

[Brief description of the drawings]

FIG. 1 is a sectional view of a heat retention device for a molten metal holding furnace according to the present invention.

FIG. 2 is a diagram of a conventional example corresponding to FIG.

[Explanation of symbols]

 A: Melt holding furnace 10: Fluidized bed furnace 2: Fluidized bed

Claims (2)

[Claims] 1. A heat retention device for a molten metal holding furnace, wherein the molten metal holding furnace is disposed in a fluidized bed furnace. 2. The heat retention device for a molten metal holding furnace according to claim 1, wherein the fluidized bed in the fluidized bed is made of a far-infrared ray generating material.