Screw-rotor machine with straight flank sections
First Claim
1. A pair of intermeshing rotors having helical lands and intervening grooves and adapted for rotation about parallel axes within a working space of a screw rotor machine, one of the rotors being of female rotor type and shaped such that each groove flank circle of the rotor and a minor portion located outside thereof, said minor portion following a curve approaching the adjacent groove when moving from the pitch circle outwardly, and the other of said rotors being of male rotor type and shaped such that each land flank thereof has a major portion located outside the pitch circle of the rotor and a minor portion located inside thereof, characterized in that in a plane perpendicular to the rotor axes said minor flank portion of at least one flank of each male rotor land comprises a first generally straight section located adjacent to the related pitch circle, and a second concavely curved section extending from said first section to the dedendum circle of the rotor, said first flank section forming at its point of intersection with the pitch circle an angle of less than 30°
- with a radial line drawn through said point of intersection from the center of the rotor.
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Accused Products
Abstract
Screw rotor machine comprising male and female rotors, where the profile of the flanks of the female rotor comprises portions inside and outside the pitch circle thereof, which portions at the point of intersection with the pitch circle have a common tangent and different radii of curvature and the profiles of the flanks of the male rotor inside the pitch circle have a generally straight section.
24 Citations
31 Claims
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1. A pair of intermeshing rotors having helical lands and intervening grooves and adapted for rotation about parallel axes within a working space of a screw rotor machine, one of the rotors being of female rotor type and shaped such that each groove flank circle of the rotor and a minor portion located outside thereof, said minor portion following a curve approaching the adjacent groove when moving from the pitch circle outwardly, and the other of said rotors being of male rotor type and shaped such that each land flank thereof has a major portion located outside the pitch circle of the rotor and a minor portion located inside thereof, characterized in that in a plane perpendicular to the rotor axes said minor flank portion of at least one flank of each male rotor land comprises a first generally straight section located adjacent to the related pitch circle, and a second concavely curved section extending from said first section to the dedendum circle of the rotor, said first flank section forming at its point of intersection with the pitch circle an angle of less than 30°
- with a radial line drawn through said point of intersection from the center of the rotor.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. Screw rotor machine apparatus for selectively compressing an expanding an elastic working fluid and having a casing with a working space providing with spaced apart high pressure and low pressure ports and including at least two intersecting bores with coplanar axes, a pair of cooperating intermeshing rotors disposed in said bores and having helical lands and intervening grooves, the rotors being adapted for rotation about parallel axes within the working space of the machine, one of the rotors being of female type and shaped such that each groove flank thereof has a major portion located inside the pitch circle of the rotor and a minor portion located outside thereof, said minor portion following a curve approaching the adjacent groove when moving from the pitch circle outwardly, and the other of said rotors being of male rotor type and shaped such that each land flank thereof has a major portion located outside the pitch circle of the rotor and a minor portion located inside thereof, characterized in that in a plane perpendicular to the rotor axes said minor flank portion of at least one flank of each male rotor land comprises a first generally straight section located adjacent to the related pitch circle, and a second concavely curved section extending from said first section to the dedendum circle of the rotor, said first flank section forming at its point of intersection with the pitch circle an angle of less than 30°
- with a radial line drawn through said point of intersection from the center of the rotor.
- View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
Specification