Rotary face seal with anti-crowning features

F - Mech Eng,Light,Heat,Weapons – 16 – J

Patent

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F16J 15/34 (2006.01)

Patent

CA 2729791

A typical rotary face seal employs a seal ring (2) rotating relative to a sealing surface (3) and also employs means to urge the seal ring towards the sealing surface in order to effect a seal. The seal ring may itself comprise a seal face (5) bonded to a backing ring (4). In certain applications, the seal face may deform significantly as a result of the temperature variations experienced and an undesirable crowning of the seal face may occur. Such crowning may be reduced by employing an improved seal ring with anti-crowning features in which the thickness of an edge (5a, 5b) of the seal face is different from that in the middle (5d) of the seal face, or in which a relief slot (16) is employed in the seal face. The improved seal ring is particularly suited for rotary face seals used in a rotary valve in a rotary gas separation device.

Un joint facial rotatif typique emploie une bague détanchéité tournant par rapport à une surface détanchéité et emploie également des moyens pour presser la bague détanchéité vers la surface détanchéité afin deffectuer un joint. La bague détanchéité peut elle-même comprendre une face de joint liée à une bague dappui. Dans certaines applications, la face de joint peut se déformer considérablement à la suite des variations de température subies et un cintrage non souhaitable de la face de joint peut se produire. Un tel cintrage peut être réduit grâce à une bague détanchéité améliorée présentant des caractéristiques anti-cintrage dans laquelle lépaisseur dun bord de la face de joint est différente de celle au milieu de la face de joint, dans laquelle une fente dallègement est employée dans la face de joint. La bague détanchéité améliorée est particulièrement appropriée aux joints faciaux rotatifs utilisés dans une soupape rotative dans un dispositif de séparation de gaz rotatif.

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