Dynamic shaft seal for pumping fibrous slurries
Patent 5344163 Issued on September 6, 1994. Estimated Expiration Date: 
September 28, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 28, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2136799 2153537 3040670 Mechanical seal assembly with integral pumping device Circumferentially grooved shroud liner Damping seal for turbomachinery Ring seal with overlapping flanges for contaminant trapping Dynamic seal Dynamic seal arrangement for impeller pump Captured rotor seal InventorsAssigneeApplicationNo. 952290 filed on 09/28/1992US Classes:277/424, Rib or groove on radial extending surface415/171.1Dynamically created sealExaminersPrimary: Cuchlinski, William A. Jr.Assistant: Cummings, Scott W. Attorney, Agent or FirmForeign Patent References
International ClassF16J 015/44AbstractA dynamic shaft seal for a fluid handling apparatus for pumping fibrous slurries, the fluid handling apparatus comprising an impeller mounted on a rotating shaft disposed in a pump housing, the shaft extending through an aperture extending from the pump housing into an impeller casing forming part of the pump housing. Prime mover means rotate the shaft. A slurry of a dispersed fibrous material in a fluid is disposed in the impeller casing, and a repeller chamber is formed in the pump housing in proximity to the aperture and in communication with the impeller casing. A repeller attached for rotation with the shaft extends into the repeller chamber to force a portion of the fluid in the impeller casing to move in a vortex in a direction away from the aperture. The invention includes means associated with the repeller to apply shear forces to the fluid vortex, and create circulatory flow within the vortex to maintain the dispersion of the fibrous material in the slurry.Field of SearchDynamically created seal | |
