Pumps – Electrical or getter type – Electromagnetic
Patent
1987-08-06
1989-05-09
Stout, Donald E.
Pumps
Electrical or getter type
Electromagnetic
164500, 1641471, 164312, 164156, B22D 2702, H02K 4400
Patent
active
048284602
ABSTRACT:
When molten metal within a molten metal tank is supplied to an injection sleeve of a casting machine through a molten-metal supply pipe by the operation of an electromagnetic pump, a sensor detects changes in height of the surface of molten metal within the tank as time passes, and a controller corrects the period during which the pump is driven on the basis of molten-metal surface detection signals from the sensor. The controller divides the difference in height of the surface of molten metal within the tank as between its highest level and its lowest level into a number n of regions, and drives the pump in such a controlled manner that the pump is connected to a three phase AC power source and is intermittently supplied with three-phase power having a constant voltage and a constant frequency so that the pump controls the molten-metal supply amount with its driven period serving as a molten-metal supply period. A molten-metal supply period for each supply operation is calculated from a predetermined equation using a molten-metal supply period corresponding to the highest level of the molten metal surface which is in turn determined from the results of casting tests. The degree of precision at which molten metal is supplied is further enhanced by an improved structure of the molten-metal supply pipe.
REFERENCES:
patent: 2219472 (1940-10-01), Defandorf et al.
patent: 3706399 (1972-12-01), Sundberg
patent: 3884291 (1975-05-01), Balevski et al.
patent: 3942577 (1976-03-01), Uozumi et al.
patent: 4633930 (1987-01-01), Behrens
patent: 4714102 (1987-12-01), Koya
Kubota Shoko
Motomura Noriyuki
Saito Hirozi
Stout Donald E.
Toshiba Kikai Kabushiki Kaisha
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