Rotary expansible chamber devices – Multistage
Patent
1997-08-25
1999-09-14
Vrablik, John J.
Rotary expansible chamber devices
Multistage
418 552, 418 553, 418 555, 418 56, 418 57, 418 60, 464102, F04C 1804
Patent
active
059512687
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns 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 spiralshaped 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.
BACKGROUND OF THE INVENTION
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.
SUMMARY OF THE INVENTION
Accordingly, in accordance with the invention, a vacuum pump with circular translation cycle comprising a stationary body with at least one stationary disk that includes, 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 connecting the movable disk to said body and supported by it, for driving circular translational motion of the movable disk relative to said body during the operation of the pump, actuating means for driving the movable disk by means of a pump shaft to cause it to effect said circular translation movement, said pump also including a device for limiting relative circular translation movement, said mechanism comprising at least one bush supported by said pump shaft, is characterized in that said pump shaft is centrally located in relation to the stationary body, said mechanism also comprises a crankshaft adapted to move with a circular translation movement and which is connected at one end to the movable disk, movement of which it drives, while its other end, close to the actuating means, is supported by said bush, and in that the device for limiting relative circular translation movement is a metal bellows, one end of the metal bellows being attached to the stationary body and the other end of the metal bellows being attached to the crankshaft, the metal bellows surrounding the crankshaft.
Experience has shown that a bellows of the above kind is capable of assuring the relative movement limitation (anti-torsion) function when the pump is rated to generate volumes at most equal to 25 m.sup.3 /hour, without problems, in particular without fatigue; note also that a bellows of the above kind assures total isolation of the pump enclosure, in which the vacuum is formed, from the outside and from the remainder of the pump, which increases the number of possible applications of a pump of the above kind. A pump of the above kind is therefore a so-called dry pump the active parts of which are isolated from the exterior and free of any lubricant, oil or grease. A pump of the above kind is obviously of great simplicity, compact overall size and, consequently, low cost.
Advantageously, the pump comprises a movable disk constituted of two movable plates the spiral-shap
REFERENCES:
patent: 3782865 (1974-01-01), Braun
patent: 3817664 (1974-06-01), Bennett et al.
patent: 4477238 (1984-10-01), Terauchi
patent: 4650405 (1987-03-01), Iwanami et al.
Leclaire Remy
Pottier Daniel
S.B.P.V. (Societe des Brevets P. Vulliez)
Vrablik John J.
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