Feasibility of Contact Elimination of a Mechanical Face Seal Through Clearance Adjustment

The feasibility of eliminating contact in a noncontacting flexibly mounted rotor (FMR) mechanical face seal is studied. The approach for contact elimination is based on a parametric study using FMR seal dynamics. Through clearance adjustment it is possible to reduce the maximum normalized relative misalignment between seal faces and, therefore, eliminate seal face contact. Clearance is measured by proximity probes and varied through a pneumatic adjustment mechanism. Contact is determined phenomenologically from pattern recognition of probe signals and their power spectrum densities as well as angular misalignment orbit plots, all calculated and displayed in real-time. The contact elimination strategy is experimentally investigated for various values of stator misalignment and initial rotor misalignment. Contrary to intuition but compliant with the parametric study, the experimental results show that for the seal under consideration contact can be eliminated through clearance reduction.

[1]  Min Zou,et al.  Real-time Condition Monitoring of Mechanical Face Seal , 1998 .

[2]  I. Etsion,et al.  Experimental Observation of the Dynamic Behavior of Noncontacting Coned-Face Mechanical Seals , 1984 .

[3]  I. Etsion,et al.  Feasibility study of a controlled mechanical seal , 1991 .

[4]  I. Etsion,et al.  Performance of the Coned-Face End Seal with Regard to Energy Conservation , 1983 .

[5]  Min Zou,et al.  Real-time monitoring and control of a noncontacting mechanical face seal , 1998 .

[6]  Itzhak Green,et al.  Clearance Control of a Mechanical Face Seal , 1999 .

[7]  R. Metcalfe.  Dynamic whirl in well-aligned, liquid-lubricated end-face seals with hydrostatic tilt instability , 1980 .

[8]  Itzhak Green,et al.  Higher harmonic oscillations in a noncontacting FMR mechanical face seal test rig , 1994 .

[9]  Gordon S. Buck.  A Methodology for Design and Application of Mechanical Seals , 1980 .

[10]  I. Etsion,et al.  Observation of Self-Excited Wobble in Face Seals , 1979 .

[11]  Min Zou,et al.  Sensitivity analysis for the design and operation of a non-contacting mechanical face seal , 2000 .

[12]  Itzhak Green,et al.  An experimental investigation of the steady-state response of a noncontacting flexibly mounted rotor mechanical face seal , 1995 .

[13]  Itzhak Green.  Gyroscopic and support effects on the steady-state response of a noncontacting flexibly mounted rotor mechanical face seal , 1989 .

[14]  Itzhak Green.  The Rotor Dynamic Coefficients of Coned-Face Mechanical Seals With Inward or Outward Flow , 1987 .

[15]  Richard F. Salant,et al.  Electronically controlled mechanical seal for aerospace applications--Part 2: Transient tests , 1995 .

[16]  Itzhak Green,et al.  Physical Modeling and Data Analysis of the Dynamic Response of a Flexibly Mounted Rotor Mechanical Seal , 1995 .