Controllable mechanical seal

Details Controllable mechanical seal Controllable mechanical seal

F - Mech Eng,Light,Heat,Weapons

16

J

341/106, 277/2,

F16J 15/34 (2006.01)

Patent

CA 1273033

CONTROLLABLE MECHANICAL SEAL ABSTRACT: A controllable mechanical seal (18) for sealing a shaft (16) rotatable relative to the housing (12) of a fluid machine (10) includes first (24) and second (30) face elements having first (34) and second (36) radial surfaces. The first element (24) is adapted for rotation with the shaft (16). The second element (30) is adapted to be stationary within the housing (12). One of the elements is movable axially relative to the shaft. The first and second surfaces (34,36) are adapted to define a gap (38) within which there is a thin lubricating fluid film. An actuator (32,32a) is provided for deforming at least one of the surfaces so that the gap converges in a direction from a high pressure side (20) to a low pressure side (22) of the seal. A sensor (48) is provided for measuring a temperature indicative of incipient contact of said surfaces (34,36). A control system (46) responsive to the sensor (48) 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.

519107

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