Abstract: A compressor is powered by a motor which is, in turn, powered by a variable speed drive (VSD). The voltage/frequency relationship of the VSD may be adjusted dynamically to maximize efficiency or permit performance within a compressor performance envelope otherwise unavailable in view of the VSD and motor.

Abstract: A discharge collector and diffuser for a screw compressor, including a housing having an inlet for receiving flow from a compressor and an outlet and defining therebetween a collector portion, a transition portion and a diffuser portion, the collector portion being adapted to receive a plurality of non-parallel streams from a compressor and to guide the streams into a substantially parallel flow direction, the housing further having a splitter plate positioned in the collector portion to separate the non-parallel streams from each other, whereby the streams are maintained separate until they are substantially parallel, thereby reducing flow losses.

Abstract: A compressor for compressing refrigerant in an air conditioning or refrigeration system, including a housing having a suction port, a discharge port, and a compression chamber, a mechanism for producing a compression cycle for compressing the refrigerant, wherein the compression cycle occurs in the suction port, discharge port and compression chamber, and a mechanism for providing liquid refrigerant into the compression cycle at a desired location for reducing pressure pulsations and associated radiated noise produced during the compression cycle.

Abstract: A discharge collector and diffuser for a screw compressor, including a housing having an inlet for receiving flow from a compressor and an outlet and defining therebetween a collector portion, a transition portion and a diffuser portion, the collector portion being adapted to receive a plurality of non-parallel streams from a compressor and to guide the streams into a substantially parallel flow direction, the housing further having a splitter plate positioned in the collector portion to separate the non-parallel streams from each other, whereby the streams are maintained separate until they are substantially parallel, thereby reducing flow losses.

Abstract: A screw compressor including a housing having a discharge port; a plurality of rotors including at least one male rotor and at least one female rotor rotatably disposed in the housing for generating a discharge flow through the discharge port, the discharge port having a radial portion and an axial portion, wherein the discharge port is positioned relative to the plurality of rotors so that the radial portion opens prior to the axial portion whereby kinetic energy in the discharge flow can be recovered.

Abstract: A screw compressor includes a housing having a discharge port; and at least two rotors disposed in the housing for generating opposed discharge flows through the discharge port, wherein the discharge port has edges defining a discharge opening, and wherein the edges are rounded so as to smooth flow of the discharge flows past the edges.

Abstract: A screw compressor including a housing having a discharge port; a plurality of rotors including at least one male rotor and at least one female rotor rotatably disposed in the housing for generating a discharge flow through the discharge port, the discharge port having a radial portion and an axial portion, wherein the discharge port is positioned relative to the plurality of rotors so that the radial portion opens prior to the axial portion whereby kinetic energy in the discharge flow can be recovered.

Abstract: A method for coating surfaces of a screw machine. The method includes the steps of providing at least one of a plurality of screw machine components including a rotor housing having at least a pair of parallel, overlapping bores; at least a conjugate pair of intermeshing rotors located in the bores, wherein each of the rotors has helical lobes having radially outward tip portions and intervening radially inward root portions; rough coating a surface of at least one of the plurality of components with a conformable coating, wherein the coating is substantially unevenly applied to the surface and has variable thickness over said surface; and leveling the conformable coating to a substantially uniform thickness prior to final assembly of the plurality of components, the substantially uniform thickness selected to ease assembly of the components, while maintaining coating performance criteria.

Abstract: A compressor for compressing refrigerant in an air conditioning or refrigeration system, including a housing having a suction port, a discharge port, and a compression chamber, a mechanism for producing a compression cycle for compressing the refrigerant, wherein the compression cycle occurs in the suction port, discharge port and compression chamber, and a mechanism for providing liquid refrigerant into the compression cycle at a desired location for reducing pressure pulsations and associated radiated noise produced during the compression cycle.

Abstract: The compressor in a refrigeration system is controlled solely by a variable speed drive which controls the motor of the compressor by virtue of the varying of the frequency of the electricity provided to the motor. To minimize the initial cost and to minimize operating costs, the variable speed drive is cooled by refrigerant from the refrigeration system which permits the use of a smaller drive, and the variable speed drive is operated at, or approaching, a unity power factor.

Abstract: The compressor in a refrigeration system is controlled solely by a variable speed drive which controls the motor of the compressor by virtue of the varying of the frequency of the electricity provided to the motor. To minimize the initial cost and to minimize operating costs, the variable speed drive is cooled by refrigerant from the refrigeration system which permits the use of a smaller drive, and the variable speed drive is operated at, or approaching, a unity power factor.