The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 19, 1991
Filed:
Apr. 12, 1990
Robert A Ingalls, Springfield, VT (US);
Excet Corporation, Springfield, VT (US);
Abstract
Helical screw rotors for a screw rotor machine wherein, for both the male and female rotor, the rotor profile includes involute curves for the male and female rotor lobe tip portion and rotor root portion, thereby generating mating involute curved surfaces of the corresponding groove, root and tip portion for the female rotor, resulting in low leakage path between the high and low pressure volumes when the rotors are in mesh, and causing ramps on the lobe tips of both the male and female rotors to form high points thereof which act as sealing strips during intermesh rotation of the rotors and in conjunction with the screw rotor machine casing. The screw rotor machines are provided with capacity control variance for same drive rotor rpm by maintaining one rotor outside diameter, root diameter, and length to diameter ratio and basic lobe proportions the same, and with the same number of lobes while for the other rotor, the outside diameter, the root and pitch diameters, and the number of lobes are varied, while maintaining basic lobe proportions the same, with significant change in machine expansion or compression capacity for a compressible working fluid captured between the intermeshed helical screw rotors.