The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 21, 2017
Filed:
Oct. 21, 2014
Applicant:
Gary K. Evans, Kilgore, TX (US);
Inventor:
Gary K. Evans, Kilgore, TX (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F04D 17/10 (2006.01); F04D 29/08 (2006.01); F16J 15/34 (2006.01); F04D 7/02 (2006.01); F04D 29/12 (2006.01);
U.S. Cl.
CPC ...
F16J 15/3404 (2013.01); F04D 7/02 (2013.01); F04D 29/128 (2013.01); F16J 15/348 (2013.01); F16J 15/3436 (2013.01);
Abstract
A cartridge seal for centrifugal pump comprises a shaft tube assembly attached to a structure. A shaft tube of the shaft tube assembly receives a shaft of the centrifugal pump. A shaft collar of the cartridge seal attached to a second end of the shaft tube is in communication with a second end of the structure. A chamber tube of the shaft tube assembly and the shaft tube collectively define a chamber that contains compressed gas. A spring is located in the chamber of compressed gas. The compressed gas and the spring cause the shaft tube assembly to substantially prevent movement of fluids between the shaft and the structure in the centrifugal pump.