Abstract: A system and method for controlling air flow into a rotary screw compressor is provided. The system includes an unloader valve for controlling airflow into the compressor. An anti-rumble system may be included in the unloader valve housing. The unloader valve is an air operated sleeve-type valve. The anti-rumble system includes an integrated vent path for the discharge side of the compressor. All moving parts are sealed within the unloader housing to prevent malfunction due to dirt entering the mechanism.

Abstract: An apparatus includes a compressor having a rotor portion, an inlet and a discharge. A motor portion of the apparatus has an intake manifold connected to the discharge. A throttle is displaceable between an open and a closed position for controlling fluid flow between the discharge and the intake manifold. A bypass return line connects the rotor portion of the compressor to the inlet. A piston valve, movable between an open location and a closed location, controls flow through the bypass return line. A control line, connecting the intake manifold to the piston valve, controls the location of the piston valve. A control valve may be included to control fluid flow through the control line. A computer, which is affected by the operation of the motor, controls the position of the control valve.

Abstract: A bearing mounting with self-compensation for thermal expansion. A rotor is mounted in a housing by way of a first bearing having an outer race mounted in the housing and an inner race mounted on the rotor. The inner and outer races are relatively axially movable. A second bearing is mounted on an end of the rotor. A resilient member maintains the inner race in engagement with the outer race in response to relative axial movement between the inner and outer races due to varying thermal expansion rates between the housing and the rotor.

Abstract: The unloader has a piston-operated valving element which opens and closes a compressor, air inlet housing, inlet port to load and unload the associated compressor. A control, pressured air supply is addressed to the piston to cause the latter to translate the valving element into port closure, and in the absence of the aforesaid supply, vacuum pressure and incoming air displace the valving element from closure of the ports. One spring seats the piston, and another moves the valving element into closure when the compressor is shut down, in one embodiment of the invention. A guide rod pilots movements of the piston and valving element. In the combination, the unloader is wholly confined within an aluminum die-cast air inlet housing.

Abstract: In the arrangement, a gear housing rotatably journals juxtaposed ends of coacting lobed, male and female rotors on a horizontal plane, and a passageway confined in the housing, on a diagonal plane which tranverses the horizontal plane, conducts oil therethrough to rotor-end bearings from an oil-admittance port at an upper end of the passageway. The rotors, then, are below the port, at a lower end of the passageway and, accordingly, the gear housing-supplied oil is scavenged into the rotors. Further, the compressor has an airend which comprises the gear housing, the latter being of aluminum, die-cast formation, having parallel, side faces, with an oil filter mounting coupled to one of the faces. A drive gear, and a therewith meshing driven gear, are supported by the housing. The driven gear is drivingly coupled to the male rotor, substantially centrally in the housing, and the female rotor is journaled in the housing, as noted, outwardly (relative to the housing) from the driven gear and male rotor.

Abstract: An air compressor having a pair of coacting rotors, useful as a supercharger for an engine, has a throttle plate in the compressed-air discharge port of its airend. The plate is carried by a shaft which is journalled in the airend housing. An air bypass channel is formed in the housing, The channel being in communication with the air-end air inlet. A pair of apertures formed in the housing open onto both the channel and the rotors, and flapper valves, pivotably mounted in the channel, monitor the apertures. Spring steel limbs, fixed to the throttle plate shaft engage and disengage the valves, to close and open the apertures, respectively, as the shaft is rotated to open and close the compressed-air discharge port, respectively again, by means of the throttle plate.

Abstract: In the disclosed embodiment, the system has a gear housing and an oil reservoir in juxtaposition, with a separated wall therebetween, and a metering channel in penetration of the wall. A gear in the housing throws oil from the lower portion of the housing (i.e., the sump) upwardly to lubricate a meshing gear, bearings, and seals, etc., and to discharge some of the oil through the wall separation into the reservoir. As a consequence of the latter, the oil level in the sump is transformed from a high static level to a lowered, dynamic level in which only the teeth of the oil-throwing gear contact the oil. The metering channel insures that the housing will have some oil constantly supplied thereto from the reservoir, while the latter gear is throwing oil, and that the static level will subsequently return when the gear is halted.