Mechanical seal with PFA bellows

Patent metadata

Field	Value
Publication number	US-8925928-B2
Application number	US-201213687895-A
Country	US
Kind code	B2
Filing date	Nov 28, 2012
Priority date	Nov 28, 2012
Publication date	Jan 6, 2015
Grant date	Jan 6, 2015

Abstract

A mechanical seal has a stationary face and rotating assembly adjacent to the stationary face. The rotating assembly includes an upper bellows ring, a lower bellows ring and a runner between the lower bellows ring and the stationary face. A bellows extends between the upper bellows ring and the lower bellows ring. In preferred embodiments, the bellows is constructed from a perfluoroalkoxy polymer and is secured within the upper bellows ring and the lower bellows ring by a selected locking mechanism. The locking mechanism may include the use of crimp rings configured for a press fit engagement within the upper and lower bellows rings. Alternatively, the locking mechanism may employ locking rings configured for threaded engagement with the upper and lower bellows rings.

First claim

What is claimed is:

1. A mechanical seal comprising:
a stationary face; and
a rotating assembly adjacent to the stationary face, wherein the rotating assembly includes:
an upper bellows ring, wherein the upper bellows ring includes an upper crimp ring recess, an upper crimp ring and one or more crimp ring screws that are configured to draw the upper crimp rings into the upper bellows rings;
a lower bellows ring, wherein the lower bellows ring includes a lower crimp ring reces…

Assignees

• Ge Oil & Gas Esp Inc

Inventors

• Howell Steven Alan
• Reeves Brian Paul
• Wang Chengbao
• Collins Charles

Classifications

• E21B43/128

  Fixed Constructions · mapped topic

• F04D29/126

  Mechanical Engineering · mapped topic

• F04B39/00 Primary

  Mechanical Engineering · mapped topic

• F16J15/36 Primary

  Mechanical Engineering · mapped topic

• F04D13/10

  Mechanical Engineering · mapped topic