Rotary expansible chamber devices – Working member has planetary or planetating movement – Helical working member – e.g. – scroll
Patent
1997-08-25
2000-02-08
Vrablik, John J.
Rotary expansible chamber devices
Working member has planetary or planetating movement
Helical working member, e.g., scroll
418 554, 418 555, F04C 1804
Patent
active
060222026
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a pump, in particular a vacuum pump, with circular translation cycle.
To be more precise, it concerns a vacuum pump with circular translation cycle comprising a stationary body with a stationary disk that includes, at least on one side thereof, a spiral-shaped projection, a movable disk facing the stationary disk and also including at least one spiral-shaped projection interleaved with the spiral-shaped projection of the stationary disk and with the same angular range, a mechanism by which the movable disk is connected to said body and supported by it, for driving circular translational motion of the movable disk relative to said body during operation of the pump, actuating means for driving the movable disk by means of a pump shaft so that it effects said circular translation movement, said pump also comprising a device for limiting relative circular translation movement guiding the movable disk in its circular translation movement and avoiding any torsion.
A pump of this kind is described in FR-A-2 141 402, for example. Although a pump of this kind as described in the aforementioned document gives excellent results, it nevertheless has the drawback of comprising many components and of being bulky, especially in the radial direction, in particular because said mechanism is made up of three cranks coupled and synchronized together and disposed at the periphery of the pump, these cranks themselves assuring limitation of the relative circular translation movement.
An aim of the present invention is to provide a pump of the above type that does not have these drawbacks.
Accordingly, in accordance with the invention, a vacuum pump with circular translation cycle include a stationary body including at least one stationary disc which has on one face a spiral-shaped projection, a moveable disk facing the stationary disk and also having at least one spiral-shaped projection interleaved with the spiral-shaped projection of the stationary disk and with the same angular range, a mechanism by which the moveable disk is connected to said body and supported by it, for driving circular translational motion of the moveable disk relative to said body during operation of the pump, actuating means for driving the mobile disk by means of a pump shaft so that it effects said circular translation movement, said pump also including a device for limiting relative circular translational movement, said mechanism comprising at least one bush carried by the pump shaft, characterized in that said pump shaft is centered relative to the stationary body and the circular translational movement limiter device comprises a ring having stationary teeth between which teeth attached to the moveable disc are interleaved.
A limiter device of the above design is capable of assuring the relative movement limitation (anti-torsion) function even if the pump is rated to generate large volumes up to 100 m.sup.3 /h, even 500 m.sup.3 /h, and even beyond this.
Preferably, the stationary teeth are limited by cylindrical surfaces with axes parallel to the axis of the pump and the section of which in a plane perpendicular to said axis is composed of circular arcs of radius R and r, respectively, the centers of which are on a circle of radius R.sub.p centered on said axis, arcs lying inside and arcs lying outside said circle.
Advantageously, the moveable teeth are limited by cylindrical surfaces with axes parallel to the axis of the pump and the section of which in a plane perpendicular to said axis is composed of arcs of the same circles respectively outside and inside said circle.
Preferably, .alpha. being the angle between two stationary teeth or movable teeth and E being the eccentricity, which corresponds to the radius of the cylinder traced out by the moveable axis around the stationary axis of the pump, ##EQU1##
Advantageously, the crank radius is adjustable.
Preferably, the axis of the passage which receives the end of the pump shaft is slightly offset relative to the axis of the exterior surface of the bush in which sai
REFERENCES:
patent: 3802809 (1974-04-01), Vulliez
patent: 4178143 (1979-12-01), Thelen et al.
patent: 4795323 (1989-01-01), Lessie
Leclaire Remy
Pottier Daniel
S.B.P.V. (Societe des Brevets P. Vulliez)
Vrablik John J.
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