Three stage scroll vacuum pump
AssigneeAir Squared, Inc.
InventorRobert W. Shaffer
Life of this patent
Estimating the term…
Abstract
A three stage vacuum pump has three stages of fixed scrolls and orbiting scrolls that operate simultaneously. A motor drives the second orbiting scroll within the third fixed scroll upon three equally spaced idlers. One idler then transmits rotation and torque into the second stage. The second orbiting scroll to has involutes upon both surfaces to engage the second fixed scroll inwardly and the first fixed scroll outwardly. The first fixed scroll has fins upon its back that extend into the atmosphere to transfer heat to air cool the invention. This pump also has a fan accelerating heat transfer. The pump operates the scrolls directly from a motor or from a motor and magnetic coupling so that the atmosphere does not infiltrate the pump.
Claims12
A three stage vacuum device producing a vacuum of approximately two milli-torr comprising:
- a first stage having a first fixed scroll and a first orbiting scroll, said first fixed scroll communicating to a space selected for evacuation, said first orbiting scroll having an inner face and an opposite outer face, said outer face of said first orbiting scroll meshing with said first fixed scroll;
- a second stage adjacent to said first stage inwardly, said second stage in gaseous communication to said first stage, said second stage having a second fixed scroll, said second fixed scroll meshing with said inner face of said first orbiting scroll;
- a third stage spaced inwardly of said second stage, said third stage in gaseous communication to said second stage, said third stage having a third fixed scroll and a second orbiting scroll, said second orbiting scroll meshing with said third fixed scroll;
- a driving pin journaled to said second orbiting scroll opposite said third fixed scroll;
- a motor operatively connected to said driving pin, said motor imparting rotation to said driving pin, said motor being generally opposite said first fixed scroll and outwardly of said second orbiting:
- scroll;
- and,
- said motor rotating said first orbiting scroll and said second orbiting scroll simultaneously thus evacuating gas molecules from the selected space.
Dependencies are inferred from the claim text.