Cold chamber magnesium pump assembly
US5630464A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 3, 1995 |
| Grant date | May 20, 1997 |
| Priority date | — |
| Expiry date | Nov 3, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22D17/30
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The machine has a holding pot containing molten magnesium in which a pumping chamber is submerged, a filling port is provided through a bottom wall of the pumping chamber, defined at least in part by a cylindrical wall surface, and an axially moveable control rod with a cylindrical shut-off part is moved between a position at which it is within the confines of the cylindrical wall surface and a position at which it is free of that wall surface. The clearance of the cylindrical wall surface and the cylindrical shut-off part of the control rod is such as to permit free movement of the rod part through the port, but, by virtue of the wetting of the surfaces by the molten magnesium, to seal the port against the pressures applied to it. Inert gas, such as argon, is introduced to the pumping chamber when the pumping chamber contains a charge of magnesium and the rod is in a shut-off position, to expel the charge of magnesium, through a runner, to a charging chamber, after which the rod is moved to a position at which the filling port is open to receive molten magnesium from the holding pot to the pumping chamber, the flow of relatively high pressure gas being cut off. Preferably, inert g…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.