Heating – Work chamber having heating means – Crucible or pot heating furnace
Patent
1987-05-21
1988-11-01
Yuen, Henry C.
Heating
Work chamber having heating means
Crucible or pot heating furnace
432159, 432161, 432214, 266214, F27B 1400
Patent
active
047815817
DESCRIPTION:
BRIEF SUMMARY
The present invention pertains to a melting and holding furnace according to the preamble of claim 1.
Known melting and holding furnaces have a burner in both the melting chamber and in the holding chamber to heat the metal to be melted and to keep the molten metal hot, and the combustion gases thus produced are exhausted through one or two stacks.
The disadvantage here is that the structure is expensive to build, and a great deal of energy is consumed in the form of the gas or oil burned in the two burners.
The task of the present invention is therefore to create a melting and holding furnace of the type described above with a much improved compact design, which therefore takes up much less room and which makes it possible to make much greater use of the energy supplied by permitting the complete combustion of all the flue gases, thus providing the advantage of environmental safety.
This task is accomplished in a melting and holding furnace of the type indicated by means of the features in the characterizing portion of claim 1.
The insight on which the invention is based therefore consists in conducting the off-gas stream from the burner, by means of which the material in the melting chamber is melted, forcibly over the surface of the molten metal in the separate holding chamber, so that in this way heat is maintained continuously and at the same time the unburned components of the off-gases are reburned. In addition, the oily components and other constituents which are present when recycled scrap is used or melted can also be burned. In this way, the energy yield is higher and the waste gas is cleaner, which means that the furnace according to the invention is environmentally safe. The production of this melting and holding furnace is simplified by the use of only a single burner.
It is advisable for the inside surface of the cover or roof of the holding chamber to be higher than the bottom of the melting chamber, so that a free space always remains between the surface of the molten bath and the inside surface just mentioned, by means of which the hot combustion gases can flow from the melting chamber to the stack along the surface of the molten bath.
To make it possible in all cases for the combustion gases to leave the melting chamber and to flow over the surface of the molten bath in the holding chamber to the stack, pressure-equalization channels are supplied in accordance with an additional embodiment of the present invention; these channels are provided in a wall of the melting chamber and/or its shaft facing the holding chamber. These pressure-equalization channels provide an alternative to the passages between melting chamber and holding chamber and function whenever the free cross section of the passages is reduced too much by a temporary excess of melt.
A simple method for removing molten metal from the melting and holding furnace according to the invention is achieved in that the entire unit consisting of melting chamber with burner and holding chamber can be tipped by means of hydraulic devices.
An exemplary embodiment of the invention is described below with reference to the attached drawings:
FIG. 1 shows a cross section through an exemplary embodiment; and
FIG. 2 shows a sectoion along line II--II of FIG. 1.
The melting and holding furnace, especially for nonferrous metals, has a melting chamber 1 and a holding chamber 2. Above melting chamber 1 there is loading shaft 3, which is closed at the top with a cover 4. Cover 4 is opened by means of a hydraulically actuated rod according to arrow A. When cover 4 is open, melting chamber 1 can be charged through loading shaft 3 with material to be melted (e.g., aluminum or aluminum alloys) by means of a loading machine (not shown). Between melting chamber 1 and holding chamber 2 there are slot-shaped (see FIG. 2) passages 6, preferably two, located at the sides. These passages 6 connect melting chamber 1 to holding chamber 2. Holding chamber 2 is lower than melting chamber 1, in such a way that surface 7 of molten metal 8 is lower than floor 9 of
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Bleickert Gerhard
Fruh Stefan
Bleiwenz GmbH
Petock Michael F.
Yuen Henry C.
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