Meshing helical rotors

• US 20040228753A1
• Filed: 12/16/2003
• Published: 11/18/2004
• Est. Priority Date: 12/16/2002
• Status: Active Grant

• Current Assignee: Carrier Corporation (Carrier Global Corporation)
• Original Assignee: Carrier Corporation (Carrier Global Corporation)
• Inventors: Tang, Yan
• Granted Patent: US 7,163,387 B2
• Time in Patent Office: Days
• US Class Current: 418/206.5
• CPC Class Codes: F01C 1/084 Toothed wheels
• CPC Class Codes: F01C 1/16 with helical teeth, e.g. chevron-shaped, screw type for non-parallel axes of movement F01C3/00

Abstract

A conjugate pair of intermeshing rotors having helical lobes having helical crests and intervening grooves and adapted for rotation about parallel axes within a working space of a screw rotor machine. Each rotor has a tip circle, a pitch circle, and a root circle, one rotor of each pair being a female rotor such that the major portion of each lobe of said female rotor is located inside the pitch circle of the female rotor. The other rotor is a male rotor formed such that the major portion of each lobe of said male rotor is located outside said pitch circle of the male rotor. The lobes of one rotor follow the grooves of the other rotor to form a continuous sealing line between said pair of rotors, each of the lobes having a primary and secondary flank portion, wherein the primary flank portion of said lobes of the female rotor have a profile formed from at least one ellipse and the primary flank portion of the lobes of the male rotor have a profile formed from at least one ellipses.

Claims

1. A conjugate pair of intermeshing rotors having helical lobes comprising helical crests and intervening grooves and adapted for rotation about parallel axes within a working space of a screw rotor machine, each rotor has a tip circle, a pitch circle, and a root circle, one rotor of each pair being a female rotor such that the major portion of each lobe of said female rotor is located inside said pitch circle of said female rotor, the other rotor being a male rotor formed such that the major portion of each lobe of said male rotor is located outside said pitch circle of said male rotor, the lobes of one rotor following the grooves of the other rotor to form a continuous sealing line between said pair of rotors, each of said lobes having a primary and secondary flank portion, wherein said primary flank portion of said lobes of said female rotor have a profile formed from at least one ellipse and said primary flank portion of said lobes of said male rotor have a profile formed from at least one ellipses.

2. The conjugate pair of intermeshing rotors according to claim 1, wherein said primary flank portion of said lobes of said female rotor is formed by first and second tangent ellipses and said primary flank portion of said lobes of said male rotor is formed by first and second tangent ellipses.