Multi-stage screw-compressor with different tooth profiles
AssigneeH & H Licensing Corporation
InventorWalter G. Spindler
Life of this patent
Estimating the term…
Abstract
A screw compressor has at least two pairs of compressor rotors arranged in series, the outside diameter of the rotors of the two pairs being substantially the same, and the ratio of the outside diameter to the diameter at the base of the rotor teeth or vanes of the second pair being such that the capacity of the rotors corresponds to the intake volume of fluid to be compressed flowing from the first to the second pair of rotors.
Claims7
A screw compressor system for compressing gaseous media adapted to compress small suction intake volumes of media and provided with a series of pairs of meshing rotors comprising two compression stages characterized in that the rotors of each series have an outside diameter which is large with respect to the suction intake volume of gas, one of said rotors of each series being a male rotor having teeth disposed in grooves of a female rotor, the axes of rotation of the second pair of rotors being spaced farther apart from each other than the axes of rotation of the first pair of rotors, and the ratio of the diameter of the rotors at the peripheral edge of the rotor teeth to the diameter of the rotor at the base of the teeth for the pairs of rotors being so related to provide grooves which compensate for the difference in volume between the intake of fluid to the first pair and the intake to the succeeding pair of rotors and wherein the rotors of the two compressor stages have essentially the same outside diameter, the ratio of the outside diameter to the dedendum diameter of the rotors in the second stage is smaller than the ratio of the outside diameter to the dedendum diameter of the rotors in the first stage and characterized in that the tooth contours of the rotors in the second stage are so designed that the ratio of tooth width of the female rotor at its narrowest point to the tooth groove width at its widest point is at least 1.0.
A screw type fluid compressor having a series comprising two pairs of rotors disposed in a housing and comprising helical threads with grooves of decreasing volume from intake to output ends of the rotors, one of said rotors being a driving male rotor having teeth disposed in grooves of a female rotor, means for flow of fluid from the first pair of rotors to the second pair of the series, the outside diameter of the rotors of the two pairs being substantially equal to each other, the axes of rotation of the second pair of rotors being spaced farther apart from each other than the axes of rotation of the first pair of rotors, the ratio of outside diameter to the diameter of the rotors at the base of the teeth of the second pair being smaller than that of the rotors of the first pair to provide grooves which compensate for the difference in volume between the intake of fluid to the first pair and the intake to the succeeding pair of rotors, and means for driving the male rotors of the two pairs at the same speed and characterized in that the tooth contours of the rotors in the second stage are so designed that the ratio of tooth width of the female rotor at its narrowest point to the tooth groove width at its widest point is at least 1.0.
Dependencies are inferred from the claim text.