Oil-sealed vane-type rotary vacuum pump with oil feed

Details Oil-sealed vane-type rotary vacuum pump with oil feed Oil-sealed vane-type rotary vacuum pump with oil feed

F - Mech Eng,Light,Heat,Weapons

04

C

F04C 29/02 (2006.01) F01C 21/08 (2006.01) F04C 18/344 (2006.01)

Patent

CA 2227168

The invention concerns an oil-sealed vane-type rotary vacuum pump with a suction chamber (8) housing a rotatably mounted rotor (3) which has an anchoring section (21) and a bearing section (23) with a slot (24) in which two vanes (26) are mounted with a space (28) between them. The rotor bearing (3) comprises the bearing section (23) and a rotor-mounting bore (11). The vacuum pump also has an oil pump (45, 46), which produces a flow of oil through the space (28) between the vanes, and a system for controlling the flow of oil through the space (28), the oil passing through a channel (66) opening out in the rotor-mounting bore (11) and then through radial and longitudinal bores (68, 69) in the bearing section (23) of the rotor. In order to reduce the noise produced by the pump when in operation, the invention proposes that the location where the oil channel (66) opens out into the rotor-mounting bore (11) and the location of the radial bore (68) in the bearing section (23) of the rotor, with respect to the location of the vanes (26) or the vane-mounting slot (24), are such that oil can only flow into the space (28) between the vanes when the volume of the space is increasing, and that there is a permanently open line leading to the vacuum-suction chamber (8) for the oil leaving the space (28) between the vanes.

L'invention concerne une pompe à vide à palettes rendue étanche à l'huile, qui comporte une chambre d'aspiration (8), un rotor (3) monté rotatif dans ladite chambre d'aspiration, qui est muni d'une section d'ancrage (21) et une section d'appui (23), une fente (24) prévue dans la section d'ancrage, deux palettes (26) disposées dans la fente et qui délimitent un espace intermédiaire (28) compris entre elles. La pompe comprend également un support pour le rotor (3), qui englobe la section d'appui (23) et un alésage de palier (11), une pompe à huile (45, 46) permettant de produire un flux d'huile traversant l'espace intermédiaire (28) compris entre les palettes, ainsi qu'un système de commande pour l'huile traversant l'espace intermédiaire (28) par le biais d'un canal d'huile (66) débouchant dans l'alésage de palier (11) et, dans la section d'appui (23), par l'intermédiaire d'alésages radiaux et axiaux (68, 69). Afin de réduire les bruits de fonctionnement de la pompe à vide, il est prévu de choisir l'endroit où le canal d'huile (66) débouche dans l'alésage de palier (11) et celui de l'alésage radial (68) dans la section d'appui (23), en fonction de la position des palettes (26) ou de la fente (24) les contenant, de manière à ce que l'huile ne parvienne dans l'espace intermédiaire (28) compris entre les palettes que lorsque le volume dudit espace augmente, et qu'il soit prévu une jonction menant à la chambre d'aspiration (8), qui reste constamment ouverte, pour l'huile sortant de l'espace intermédiaire (28) compris entre les palettes.

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