Abstract: A multi-stage compressor comprises a gas compressor, a centrifugal blower having an input connected with a gas source and an output connected with the gas compressor and providing a flow of compressed gas as a first stage of compression to the gas compressor, and a power source mechanically connected with and driving both the centrifugal blower and gas compressor to provide multi-stage compression of said gas.

Abstract: A multi-stage compressor comprises a gas compressor, a centrifugal blower having an input connected with a gas source and an output connected with the gas compressor and providing a flow of compressed gas as a first stage of compression to the gas compressor, and a power source mechanically connected with and driving both the centrifugal blower and gas compressor to provide multi-stage compression of said gas.

Abstract: A compressor cooling system is provided for use with an engine PTO driven oil-flooded air compressor. The compressor cooling system includes an oil flow path from the compressor oil outlet, through an oil/coolant heat exchanger, and to the compressor oil inlet. The system further includes a coolant flow path in fluid communication with the engine cooling system with the oil/coolant heat exchanger interposed in the coolant flow path. Thus, coolant flowing through the engine cooling path also flows through the oil/coolant heat exchanger in heat transfer relation with the compressor oil flowing therethrough. The compressor coolant flow path is integrated into the engine cooling system so that flow through the compressor coolant flow path is not interrupted by operation of the thermostatic bypass valve in the engine cooling system.

Abstract: A compound turbocharger system for an engine/compressor unit is disclosed including a pair of conventional turbochargers including turbine components connected in series to convert exhaust gas energy from the engine cylinders into mechanical energy for driving a pair of impeller-type compressor components arranged to supply sufficient quantities of air to the intake manifold of the engine cylinders and to the intake manifold of the compressor cylinders. In one embodiment, the impeller-type compressor components are arranged in parallel. In a second embodiment, the impeller-type compressor components are arranged in series with the air supplied to the intake manifold of the engine cylinders being provided by the first compressor component.

Abstract: A compound turbocharger system (2, 2', 112) for an engine/compressor unit (4, 4') is disclosed including a pair of conventional turbochargers (14, 16, 111, 113) including turbine components (18, 22, 114, 116) connected in series to convert exhaust gas energy from the engine cylinders (6, 104, 106, 108, and 110) into mechanical energy for driving a pair of impeller-type compressor components (26, 28, 118 and 120) arranged to supply sufficient quantities of air to the intake manifold (42, 122) of the engine cylinders (6, 104, 106, 108, 110) and to the intake manifold (40, 124) of the compressor cylinders (8, 100, 102). In one embodiment, the impeller-type compressor components (26, 28) are arranged in parallel. In a second embodiment, the impeller-type compressor components (118, 120) are arranged in series with the air supplied to the intake manifold (122) of the engine cylinders (104, 106, 108, 110) being provided by the first compressor component (118).

Abstract: A method and apparatus for controlling a compressor is disclosed wherein both the compressed air output and the speed of the compressor are simultaneously adjusted in relation to compressed air demand over a wide range of air demands and in a way so as to use less input energy during below-peak demand and automatically return the compressor to an operating condition of minimum speed and minimum power input when there is no demand on the compressor. A reciprocating piston compressor with at least two, and typically more than two, compression chambers driven by a prime mover has a separate unloader device for each compression chamber. A control assembly is responsive to tank pressures indicating demand on the compressor with the movement of one movable control member simultaneously operating both a control valve adapted for successively operating each of the unloader devices one at a time and a speed regulating member for the prime mover.