EP 0115228 B1 19880302 - VOLUMETRIC MACHINE WITH CONICAL SCREWS
Title (en)
VOLUMETRIC MACHINE WITH CONICAL SCREWS
Publication
Application
Priority
FR 8221686 A 19821223
Abstract (en)
[origin: US4522576A] The rotors (M, F) each have a conical outer profile and a constant pitch diameter, the rotors being mounted in opposition in the housing (1) with their axes (2, 3) parallel and their pitch diameters tangent (4). The grooves (5) of the female rotor (F) have a radial depth, in relation to the pitch diameter, which varies in inverse proportion to the outside diameter of the female rotor (F), and which, more specifically, have a circular cross-section the radius of which increases progressively in the direction of reduction of the outside diameter of the female rotor, the center of these radii remaining on the pitch diameter. The rotors are produced advantageously by molding a plastic or by casting a light alloy.
IPC 1-7
IPC 8 full level
F01C 1/08 (2006.01); F01C 1/16 (2006.01); F04C 18/16 (2006.01)
CPC (source: EP US)
F01C 1/084 (2013.01 - EP US)
Citation (examination)
L.Rinder "Schraubenverdichter", 1979 Springer-Verlag, Wien; pages 4 t0 8
Designated contracting state (EPC)
DE GB IT SE
DOCDB simple family (publication)
FR 2538463 A1 19840629; FR 2538463 B1 19850621; DE 3375813 D1 19880407; EP 0115228 A1 19840808; EP 0115228 B1 19880302; JP H0578674 B2 19931029; JP S59131792 A 19840728; US 4522576 A 19850611
DOCDB simple family (application)
FR 8221686 A 19821223; DE 3375813 T 19831215; EP 83402429 A 19831215; JP 24226383 A 19831223; US 56265383 A 19831219