Vilter Manufacturing LLC

Luc Langouet

A variable capacity rotary screw compressor having a rotor housing including a bore, an inlet, an outlet, a slide valve recess and rotors. Passive and active slide valves are mounted in the recess. Individual passive and active slide valve balancing units are connected to the passive and active slide valves respectively. A prime mover is connected to selectively regulate the position of the active slide valve. A first conduit is connected between the housing inlet and the passive and active slide valve balancing units and includes a first valve operable to either open or close the first conduit. A second conduit is connected in fluid communication between the outlet and the passive and active slide valve balancing units and includes a second valve operable to either open or close the second conduit. A first sensor provides a first signal proportional to suction pressure. A second sensor provides a second signal proportional to discharge pressure. A third sensor provides a third signal proportional to the position of the active slide. A control receives the first, second and third signals and provides: first and second control outputs to open either the first or the second valve to balance the passive and active slide valves with either suction or discharge pressure; and a third control output connected to the prime mover for regulating the position of the active slide valve.

Compressor slide valve control

A bearing and seal assembly for supporting a rotor for rotation about an axis in a rotor receiving bore of a rotating machine which is concentric to the axis of rotation. The bearing and seal assembly includes a nonrotatable bearing support member dimensioned to loosely fit inside the rotor bore so as to be radially movable relative to the axis of rotation. A bearing receiving portion is provided on the bearing support that holds a bearing which mounts the rotor on the bearing support member. A seal is nonrotatably mounted on the bearing support and has an outer peripheral portion dimensioned to have a close tolerance nonrotating fit with an inner peripheral surface of the rotor bore; an inner peripheral portion; and an nonrotating sealing surface dimensioned to have a close tolerance sealing relationship with a rotating sealing surface on the rotor. The bearing support has a radial dimension that is less than the radial dimension between a radial outer portion and an inner peripheral surface of the bore to permit radial adjustment of the rotor axis to locate a rotor sealing surface in concentricity with the nonrotating sealing surface of the seal. A releasable clamping device is provided for securing the members together to lock the rotor and seal surfaces in the position of concentricity.

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Milwaukee, WI, United States of America

Luc Langouet