Scroll type fluid displacement apparatus having a capacity...

F - Mech Eng,Light,Heat,Weapons – 04 – C

Patent

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Details

F04C 18/02 (2006.01) F04C 2/02 (2006.01) F04C 15/02 (1995.01) F04C 29/08 (1995.01)

Patent

CA 2068776

A scroll type fluid displacement apparatus, in particular, a scroll type compressor, is disclosed. The apparatus includes a pair of scroll members at an angular and radial offset for forming fluid pockets, each scroll member having a spiral element. A bypass hole is provided on a wall of at least one of the spiral elements of the scroll members for communicating between the fluid pockets and a suction chamber. A valve mechanism, which operates in a radial direction, controls the opening and closing of the bypass hole. The valve mechanism is responsive to the rotational motion of the scroll members and/or the pressure in at least one of the fluid pockets. When the apparatus is driven at excessive speed, the valve mechanism operates in response to centrifugal force to open the bypass hole. The compressed fluid in the fluid pockets then is released into the suction chamber through the opened bypass hole, and the compression capacity is reduced to a proper value. Additionally, when the pressure in the fluid pockets becomes excessive, the valve mechanism operates to open the bypass hole to thereby decrease the pressure a proper value.

Cette invention concerne un appareil de pompage du type à spirales et, en particulier, un compresseur à spirales. L'appareil comprend une paire de spirales décalées angulairement et radialement pour former des poches de fluide, chaque spirale étant un flasque sur lequel se profile une ailette spiralée. Un orifice de dérivation est ménagé dans une paroi d'au moins une des ailettes spiralées des spirales pour établir la communication entre les poches de fluide et une chambre d'aspiration. Un clapet radial règle l'ouverture et la fermeture de l'orifice de dérivation. Ce clapet réagit au mouvement tournant des spirales et/ou à la pression qui règne dans au moins une des poches de fluide. Lorsque l'appareil est en surrégime, le clapet ouvre l'orifice de dérivation sous l'effet de la force centrifuge. Le fluide comprimé dans les poches de fluide est alors admis dans la chambre d'aspiration par cet orifice et la capacité de compression est ramenée à un niveau approprié. De plus, lorsque la pression dans les poches de fluide devient trop élevée, le clapet ouvre l'orifice de dérivation pour réduire cette pression à une valeur appropriée.

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