Mechanical seal with automatic gap convergence control

Details Mechanical seal with automatic gap convergence control Mechanical seal with automatic gap convergence control

1986-03-17

1987-02-17

Ward, Robert S.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

277 81R, 277 961, 277901, F16J 1534

Patent

active

046434372

ABSTRACT:
A controllable mechanical seal for sealing a shaft rotatable relative to the housing of a fluid machine includes first and second face elements having first and second radial surfaces. The first element is adapted for rotation with the shaft. The second element is adapted to be stationary within the housing. One of the elements is movable axially relative to the shaft. The first and second surfaces are adapted to define a gap within which there is a thin lubricating fluid film. An actuator is provided for deforming at least one of the surfaces so that the gap converges in a direction from a high pressure side to a low pressure side of the seal. A sensor is provided for measuring a temperature indicative of incipient contact of said surfaces. A control system responsive to the sensor generates an external voltage which is applied to the actuator to control the convergence of the surfaces and thus maintain an optimum thickness of the lubricating film for a wide range of operating conditions.

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Metcalfe, R., "Performance Analysis of Axisymmetric Flat Face Mechanical Seals," 6th International Conference on Fluid Sealing, Munich, West Germany (1973), 14 pp.
Lebeck, A. O., "Design of an Optimum Moving Wave and Tilt Mechanical Face Seal for Liquid Applications," 9th International Conference on Fluid Sealing, Noordwijkerhout, Netherlands (1981), 22 pp.
Salant, R. F. and Key, W. E., "Development of an Analytical Model for Use in Mechanical Seal Design," 10th International Conference on Fluid Sealing, Cranfield, England (1984), 19 pp.
Salant, R. F. and Key, W. E., "Improved Mechanical Seal Design Through Mathematical Modelling," 1st International Pump Symposium, Texas A&M University (1984), 10 pp.

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