Vacuum pumps
AssigneeThe BOC Group, Inc.
InventorNigel Paul Schofield
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Abstract
A vacuum pump of the regenerative type comprising a rotor and a stator body in which the rotor is adapted for rotation. The rotor has a series of blades positioned in an annular array on a side of the rotor. The stator has an annular channel within which the blades can rotate having a cross-sectional area greater than that of the individual blades except for a small part of the channel which has a reduced cross-section providing a close clearance for the blades. Further, the rotor has at least two series of blades positioned in concentric annular arrays on a side of the rotor and the stator has a corresponding number of channels within which the blades of the arrays can rotate. The channels are linked to form a continuous passageway through which gas being evacuated by the pump can pass.
Claims9
A vacuum pump of the regenerative type comprising:
- a stator body;
- a rotor to rotate within said stator body;
- the rotor having at least two series of blades positioned in concentric annular arrays on a side of the rotor;
- the stator body having at least two annular channels within which the blades rotate, each of said at least two annular channels having a cross-sectional area greater than that of the said blades;
- and
- means for linking the at least two annular channels to form a continuous passageway for passage of gas being evacuated by the pump.
Dependencies are inferred from the claim text.