Elastomer energized rod seal
First Claim
1. Annular seal for sealing between a static and a dynamic machine part, therebetween which a fluid or gas seal is required, the annular seal being made of a resilient material and energized by a surrounding compression ring, the annular seal being installed with the compression ring in a common, rectangular housing groove such that it separates the compression ring from a moving surface of the dynamic machine part and the downstream wall of the housing groove, characterized by the outer diameter of the seal meeting or exceeding that of the groove bottom, the seal having a seal apex, the seal being configured for concentrating contact forces against the moving surface solely via the seal apex.
2 Assignments
0 Petitions
Accused Products
Abstract
The present seal system is in two parts. First is that of an elastomer energizer, which may be in the shape of a square ring, o-ring, or an other custom design for energizing the seal system. Second is that of a seal element having a particular geometry and composition. The geometric layout of the seal element ensures firm contact between the seal and groove bottom, independently of the seal pressure and radial position of the moving part, and concentrates contact forces against the moving part by means of a seal apex. In the installed state, the seal is forced into contact with the groove bottom by having an outer diameter matching or exceeding that of the groove bottom, and a radial height exceeding that of the housing groove. Further, the influence of the compression ring or energizer is balanced out by positioning the seal apex near the axial position of the center of the energizer. The seal apex itself is defined by an inlet angle upstream of the apex of preferably more than 30° to the moving part, and a downstream slip angle of greater than 5° preferably greater than 7°.
-
Citations
16 Claims
- 1. Annular seal for sealing between a static and a dynamic machine part, therebetween which a fluid or gas seal is required, the annular seal being made of a resilient material and energized by a surrounding compression ring, the annular seal being installed with the compression ring in a common, rectangular housing groove such that it separates the compression ring from a moving surface of the dynamic machine part and the downstream wall of the housing groove, characterized by the outer diameter of the seal meeting or exceeding that of the groove bottom, the seal having a seal apex, the seal being configured for concentrating contact forces against the moving surface solely via the seal apex.
Specification