Volumetric screw compressor
AssigneeSociete Anonyme D.B.A.
InventorsJean-Jacques Carre, Pierre Courbot, Roland Levrai
Life of this patent
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Abstract
The compressor, with rotating assemblies of low inertia, and of compact construction, comprises, housed in a housing, two hollow rotors (5, 6), for example out of plastic material, fixed respectively on a front shaft member (20, 21) journalled in a front bulkhead (26) and each supported at the rear by a rear bearing assembly (11) fixed to a rear end wall (2) of the housing and entirely contained within the internal space (7, 7) in the rotor. The drive is provided by the female rotor (6). The inner surfaces of the housing and the outer surfaces of the rotor threads are coated with an overthickened layer of an erodable coating material containing particles of a dry lubricant material.
Claims13
A screw compressor, comprising a male rotor and a female rotor respectively arranged within two intercommunicating parallel cylindrical chambers formed in a housing and closed, at their opposite axial ends, by a rear end wall and a front bulkhead, each rotor being supported and rotatingly driven by a shaft means including a first shaft end extending through said front bulkhead, said first shaft ends being provided with meshing toothed wheels for synchronously driving said rotors, each said first shaft end extending within a recess formed in the corresponding rotor and being coupled for rotation therewith within said recess, characterized in that each rotor includes a hub having a longitudinally extending transversing internal space, each said shaft means comprising a rear bearing assembly received within the corresponding end portion of said internal space and sealingly mounted on a rear shaft member fixed to said rear end wall, and a front shaft member forming said first shaft end secured to the corresponding rotor and cooperating with an annular seal received within a tubular portion of said front bulkhead which extends into said front end portion of said internal traversing space.
A screw compressor comprising a male rotor and a female rotor having cooperating threads respectively housed in two parallel intercommunicating chambers formed in a housing having inner walls and closed, at their opposite axial ends, by a rear end wall and a front end wall, respectively, each rotor being supported and driven in rotation by shaft means comprising a first shaft end extending through said front end wall, said first shaft ends being provided with meshing toothed wheels for synchronous driving of said rotors, characterized in that at least said inner walls of said chambers are coated with an overthickened layer of an erodable coating material containing particles of dry lubricant material, said driving toothed wheels being meshingly coupled without angular play.
Dependencies are inferred from the claim text.