Bearing wear detection devices
AssigneeThe A.P.V. Company Limited
InventorWilliam Howard Considine
Life of this patent
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Abstract
A sealed pump having a rotor and a stator and including an electromagnetic system comprising magnet means and a coil mounted on the rotor and stator and arranged such that a voltage is induced in the coil when the rotor rotates eccentrically, with the said voltage depending on the eccentricity.
Claims14
In a glandless sealed rotor pump of the type having a static housing, bearings in said housing, and a rotor mounted in said bearings and wholly contained within said housing:
- the improvement comprising an electromagnetic bearing wear detection system including magnet means mounted on said rotor and a coil mounted coaxially on said rotor outside said housing immediately adjacent the path of said magnet means as said rotor rotates, said magnet means being mounted eccentrically of said rotor so as to follow a circular path at a constant distance from said coil as said rotor rotates truly in said bearings whereby the flux threading said coil remains constant, but to follow a circular path varying in distance from said coil if said rotor rotates eccentrically whereby the flux threading said coil varies and induces an alternating e.m.f. in said coil, the amplitude of the e.m.f. varying with the eccentricity of said rotor and the frequency of the e.m.f. varying with the speed of rotation of said rotor.
A glandless sealed rotor pump having a static housing, bearings in said housing and a rotor mounted in said bearings and wholly contained within said housing and including an electromagnetic system comprising magnet means and a coil, one of said magnet means and coil being mounted on said rotor and the other of said magnet means and coil being mounted on said stator, said magnet means and coil being arranged such that a voltage is induced in said coil when said rotor rotates eccentrically with respect to said stator, with the voltage depending on the eccentricity, a measuring circuit, means for electrically coupling said coil to said measuring circuit, a cut out operatively connected to said measuring circuit, said measuring circuit energizing said cut out when the signal level exceeds a given level, and said measuring circuit including a memory device to record the maximum signal level since the circuit was energized.
Dependencies are inferred from the claim text.