| US 7,563,087 B2 | ||
| Pump rotor seal apparatus and method | ||
| Drew J. Van Norman, Whitewater, Wis. (US); and Curt Hagen, Delavan, Wis. (US) | ||
| Assigned to SPX Corporation, Charlotte, N.C. (US) | ||
| Filed on Apr. 18, 2006, as Appl. No. 11/405,525. | ||
| Prior Publication US 2007/0243091 A1, Oct. 18, 2007 | ||
| Int. Cl. F04C 2/00 (2006.01); F04C 27/02 (2006.01); F04C 29/02 (2006.01) | ||
| U.S. Cl. 418—102 [418/104; 418/141; 418/191] | 18 Claims |
| 1. A pump, comprising:
a body forming a chamber;
at least one rotor rotating in the chamber, the rotor having a shaft with a cylindrical outward face that has a first outer
diameter portion and a second outer diameter portion, with a shoulder between the first outer diameter portion and the second
outer diameter portion; and
a body hub portion extending from the body and oriented axially and having a cylindrical inner diameter face in rotational
sliding contact with one of the first or second outer diameter portions of the shaft, wherein a bushing clearance gap is defined
at the contact between the inner diameter face of the body hub and the second outer diameter portion of the rotor shaft, and
wherein the rotor has a circular axial facing surface and the body hub has an end facing axially that slidingly contacts the
axial facing surface of the rotor to define a body hub clearance gap, further wherein the rotor and the body hub portion define
between them a seal chamber, and wherein the body hub has a suction vent port penetrating the hub from the seal chamber.
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