Metallurgical apparatus – Means for melting or vaporizing metal or treating liquefied... – By stirring or mixing molten metal
Patent
1989-01-09
1990-01-09
Andrews, Melvin J.
Metallurgical apparatus
Means for melting or vaporizing metal or treating liquefied...
By stirring or mixing molten metal
266901, 366341, 75 65R, 75 68R, F27D 2304
Patent
active
048922943
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a device for liquid pumping and comprises a pump chamber which is arranged to receive a subportion of the liquid to be pumped. The pump chamber is provided with means for cyclic variation of the pressure in the pump chamber between a pressure greater than and a pressure less than in the chamber where the main portion of the liquid is. The pump chamber is further provided with at least one input opening and at least one output opening. The device can be used to pump all kinds of liquids, for example for stirring molten metal bodies in connection with holding or degasifying of such bodies, for circulation by pumping of aggressive or corrosive liquids, or for pumping of two liquid states for reducing the risk of emulsion forming.
TECHNOLOGY REVIEW
Furnaces for melting of metal, for example aluminium scrap, having means for circulation of the melted charge are previously known. Such furnaces generally comprise a main chamber provided with heating means, generally in the shape of gas or oil burners, for melting heavy material; a side chamber to be charged with small scrap; and a pump chamber for circulation of melted metal between the main chamber and the side chamber. A furnace of this type is disclosed in the Swedish patent publication 8200622-2. In this furnace, controllable pistons are used as valves which open and close openings between the pump chamber and the main chamber or the side chamber for guiding molten metal between the main chamber and the side chamber. However, such controllable pistons are heavily worn in the hard environment in which they work and must therefore be replaced regularly thereby entailing a maintenance cost. Furthermore, the provision of controllable piston valves also entails a comparatively high initial cost for the equipment.
SUMMARY OF THE INVENTION
The main object of the invention is, therefore to provide a device for liquid pumping which enables pumping of molten metal as well as pumping of many other types of liquids for stirring or circulation without the use of movable piston valves, so that the maintenance costs are reduced to a minimum and also the initial costs are reduced substantially. This object is achieved by a device for liquid pumping, including a main chamber and a pump chamber for receiving a subportion of the liquid to be pumped from the main chamber and which is provided with means for cyclic variation of the pressure in the pump chamber between a pressure greater than and a pressure less than the pressure in the main chamber. The pump chamber is connected to the main chamber by at least one input opening and at least one output opening. The input opening has a substantially lower flow resistance in the direction into the pump chamber than in the opposite direction and the output opening has a substantially lower flow resistance in the direction out of the pump chamber than in the opposite direction. Thereby, when the pump chamber is at a pressure lower than the pressure in the main chamber, a larger liquid quantity is sucked into the pump chamber through the input opening and when the pump chamber is at a pressure lower than the pressure in the main chamber a larger liquid quantity is forced out through the output opening than through the input opening, so that a net liquid quantity is sucked in through the input opening and forced out through the output opening.
In an alternative embodiment, the present invention provides a melting furnace or similar device having a main chamber, a side chamber connected to the main chamber by an opening in a furnace wall; and a pump chamber connected to the main chamber as well as to the side chamber by at least one opening to each chamber in the furnace wall. The pump chamber is provided with means for cyclic variation of the pressure in the pump chamber between a pressure higher than the pressure in either the main or side chamber and a pressure lower than pressure in the remaining chamber. At least one of the openings between the pump chamber and the main
REFERENCES:
patent: 3973763 (1976-08-01), Steinke et al.
patent: 4355789 (1982-10-01), Dolzhenkov et al.
patent: 4518424 (1985-05-01), Ormesher
Andrews Melvin J.
Granges Aluminium Aktiebolag
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