| 摘要 |
<p>A pump apparatus for pumping molten metal from a furnace (5) to a place where it is to be used (46) is described which comprises a pump (1) of gas-plunger type having a container holding a chamber (18) with an inlet (47) for drawing metal from the furnace (5) to the chamber (18), and with an outlet (48) for forcing metal out of the chamber (18) to the place of use (46). According to the invention the inlet (47) and the outlet (48) of the chamber (18) are arranged at the bottom (9) thereof. Further, the apparatus includes a suction and pressure system (40) which comprises a closed circuit (49) containing a vacuum tank (42), a pressure tank (43), a vacuum pump/compressor unit (41) connected therebetween, and a valve means (44), the closed circuit being connected to the chamber via a conduit (50). A control system (19) is arranged to alternately connect and disconnect the vacuum tank (42) and pressure tank (43) and to synchronously therewith alternately open and close the inlet (47) and outlet (48) of the chamber by actuation of their valves (13).</p> |
