Rotary expansible chamber devices – Interengaging rotating members – Helical or herringbone
Patent
1982-12-22
1984-07-17
Smith, Leonard E.
Rotary expansible chamber devices
Interengaging rotating members
Helical or herringbone
F01C 116, F04C 200
Patent
active
044603223
ABSTRACT:
The invention relates to the design of the profiles of two meshing rotors, which are provided with helical lands and intervening grooves and adapted for rotation around parallel axes in a working space in a rotary screw machine, where one groove in one rotor (female rotor 1) co-operates with a corresponding land on a second rotor (male rotor 2), so that a chevron shaped chamber is formed by the flanks of the groove and the land, with the open legs of the chamber ending at the high-pressure end of the machine. The flank profiles according to the invention are designed so that the torque acting on the female rotor by the gas forces in the machine is 17-19.5%, preferably about 18.5%, of the corresponding torque on the male rotor, and that the blow hole area formed hereby at the high-pressure side of the rotor mesh does not exceed a value corresponding to 25 mm.sup.2 per liter volume of the chevron shaped chamber when this chamber has its maximum volume, calculated for a male rotor diameter of 100 mm, a male rotor length of 150 mm and a wrap angle of the male rotor of 300.degree.. According to an embodiment, the groove flanks of the female rotor are designed so that they include a leading groove flank portion, which follows an elliptic curve, and the land flanks of the male rotor are designed so that they include a leading land flank portion, which is line-generated by the elliptic groove flank portion of the female rotor.
REFERENCES:
patent: 2174522 (1939-10-01), Lysholm
patent: 2622787 (1952-12-01), Nilsson
patent: 3245612 (1966-04-01), Nilsson et al.
patent: 3414189 (1968-12-01), Persson
patent: 3423017 (1969-01-01), Schibbye
patent: 3787154 (1974-01-01), Edstrom
patent: 4140445 (1979-02-01), Schibbye
patent: 4412796 (1983-11-01), Bowman
Marks, Standard Handbook for Mechanical Engineers, McGraw-Hill, New York, 1967, pp. 2-52, 53.
Fredlund Sture
Schibbye Lauritz B.
Obee Jane E.
Smith Leonard E.
Sullair Technology AB
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