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1. (WO2017040133) CIRCUMFERENTIAL BACK-TO-BACK ASSEMBLY WITH BIFURCATED FLOW

Pub. No.:    WO/2017/040133    International Application No.:    PCT/US2016/048309
Publication Date: Fri Mar 10 00:59:59 CET 2017 International Filing Date: Thu Aug 25 01:59:59 CEST 2016
IPC: F16C 32/06
Applicants: STEIN SEAL COMPANY
Inventors: GARRISON, Glenn, M.
Title: CIRCUMFERENTIAL BACK-TO-BACK ASSEMBLY WITH BIFURCATED FLOW
Abstract:
A circumferential seal assembly (1 or 21) capable of separating a gas into two separate flow paths before communication between a rotatable runner (15 or 35) and a pair of seal rings (3, 4 or 23, 24) is presented. The seal assembly (1 or 21) includes an annular seal housing (2 or 22), a pair of annular seal rings (3, 4 or 23, 24), a rotatable runner (15 or 25), and a plurality of groove structures (17, 37, 41 or 55). The seal housing (2 or 22) is interposed between a pair of compartments (5, 6 or 58, 59). The seal rings (3, 4 or 23, 24) are separately disposed within the seal housing (2 or 22) and separately disposed around the rotatable runner (15 or 35). The groove structures (17, 37, 41 or 55) are disposed along an outer annular surface (16 or 36) of the rotatable runner (15 or 35). A gas is communicable onto the groove structures (17, 37, 41 or 55). Each groove structure (17, 37, 41 or 55) includes at least two hydrodynamic grooves (19, 38, 43, or 49) that separate and communicate the gas onto the seal rings (3, 4 or 23, 24). Each groove (19, 38, 43, or 49) includes steps (62) whereby the depth (h) of at least one adjoining step (62) decreases in the direction opposite to rotation with or without the depth (h) of another adjoining steps (62) increasing in the direction opposite to rotation.