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AssigneeVihorlat, narodny podnik
InventorsMichal Kostura, Jan Pandula, Absolon Harmansky, Slavomir Smiga, Stefan Kepic
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A serial flow of a variable-boiling point volatile fluid is established through the wall of a casting mold and through a heater and condenser associated therewith by means of a pump. The condenser includes a lower portion in the path of flow of the volatile liquid, and an upper portion through which an auxiliary conduit extends, such conduit conveying a variable flow of coolant through the upper condenser portion. Changes in vapor pressure of the volatile liquid as the temperature in the mold changes are detected in the upper portion of the condenser by a suitable sensing device, and the output indication of the latter is employed to control a regulating valve for the auxiliary conduit to vary the flow of coolant in the auxiliary conduit. Such variations in flow, in turn, serve to adjust the vapor pressure, and thus the boiling point, of the volatile liquid and to thereby help compensate for temperature changes in the casting mold.
In an arrangement for regulating the temperature of a casting mold, a casting mold having a wall, first conduit means having upstream and downstream ends and a first portion and extending through the wall of the casting mold for conveying a first volatile fluid to remove heat from the mold wall at a rate related to the then-occurring boiling point of the first fluid, condenser means including a hollow chamber having an upper portion and a lower portion in fluid communication, the upstream end of the first conduit means terminating in a first relatively low point of the lower portion of the condenser means and the downstream end of the first conduit means terminating in a second relatively high point of the lower portion, second conduit means extending into the upper portion of the condenser means for conveying a second cooling fluid through said upper portion, regulatable heater means associated with a first portion of the first conduit means between the upstream end thereof and the casting mold for selectively heating the associated first portion, and pump means serially disposed in the path of the first conduit means for maintaining a serial flow of the first fluid through the first conduit means and the lower portion of the condenser means.
Dependencies are inferred from the claim text.