Accession Number : ADD014142

Title :   Multiple Tooth Engagement Single Screw Mechanism.

Descriptive Note : Patent, Filed 27 Aug 86, patented 25 Apr 89,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Winyard, David C

Report Date : 25 Apr 1989

Pagination or Media Count : 5

Abstract : In order to form single screw mechanisms it is known to make use of combinations comprising a mainrotor having a conical surface and projecting threads having a generally helicoidal shape. The crests of the threads are intended to cooperate with a casing, thereby forming compression chambers, and the mainrotor is adapted to cooperate with one or a number of gaterotors, the teeth of which are in meshing relation with the threads formed on the mainrotor. The space formed between two adjacent threads of the mainrotor form a compression chamber which is sealed off at one end by a gaterotor tooth and at the other end by a casing closed end. When fluid is sucked into the compression chamber, the rotation of the mainrotor permits a progressive reduction in the volume of the compression chamber, compressing the fluid until the compression chamber is put into communication with a casing outlet. This patent discloses a single screw mechanism with a reduced differential pressure applied to the gaterotor teeth. This is accomplished by providing multiple tooth engagement of gaterotor teeth in a particular mainrotor compression chamber. Multiple tooth engagement makes possible the use of metallic gaterotor teeth and the elimination of gaterotor supports used to prevent the disengagement of gaterotor teeth due to high differential pressure. Keywords: Patents. (AW)

Descriptors :   *PATENTS, *COMPRESSOR ROTORS, *SEALED SYSTEMS, *SCREWS, CHAMBERS, COMPRESSION, CONICAL BODIES, HIGH PRESSURE, PRESSURE GRADIENTS, REDUCTION, SURFACES, TEETH

Subject Categories : Hydraulic and Pneumatic Equipment
      Couplers, Fasteners, and Joints

Distribution Statement : APPROVED FOR PUBLIC RELEASE