Scroll compressor having a suction check valve

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

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Details

F04F 5/50 (2006.01) F01C 1/04 (2006.01) F04C 2/02 (2006.01) F04C 18/02 (2006.01) F04C 18/063 (2006.01) F16K 15/06 (2006.01) F25B 31/02 (2006.01)

Patent

CA 2174200

A scroll compressor is provided with a check valve which is disposed in a suction chamber adjacent a suction port opening. The check valve provides fast response and enhanced operating characteristics for preventing reverse refrigerant flow and reverse scroll operation during compressor shutdown. During normal compressor operation the check valve is open to allow communication of refrigerant into the suction chamber where the refrigerant is acted upon by the scroll mechanism and discharged through a discharge port. A positive pressure differential exists between the discharge port and the suction port which unimpeded causes reverse scroll operation upon compressor shutdown. The positive pressure condition in the suction chamber forces the check valve to pivot to a closed position whereby it covers and substantially seals the suction port. By preventing reverse refrigerant flow through the suction port the check valve effectively eliminates the pressure differential and thereby prevents reverse scroll operation.

Cette invention concerne un compresseur à spirales muni d'un clapet de retenue à l'admission dans la chambre d'aspiration. Ce clapet de retenue à action rapide améliore les caractéristiques de fonctionnement du compresseur en empêchant les retours de frigorigène et l'inversion de marche de la spirale mobile à l'arrêt du compresseur. En cours de fonctionnement normal du compresseur, le clapet de retenue est ouvert pour permettre l'entrée du frigorigène dans la chambre d'aspiration où il est comprimé par le mécanisme à spirales et refoulé par une lumière de refoulement. Une différence de pression positive existe entre la lumière de refoulement et la lumière d'admission, pression qui, non compensée, cause l'inversion de marche de la spirale mobile à l'arrêt du compresseur. La pression positive dans la chambre d'admission force le clapet de retenue à se fermer et à bloquer de façon sensiblement étanche la lumière d'admission. En empêchant les retours de frigorigène par la lumière d'admission, le clapet élimine de façon efficace la différence de pression à l'origine de l'inversion de marche de la spirale mobile.

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