Stabilization ring and seal clearance for a scroll compressor

Details Stabilization ring and seal clearance for a scroll compressor Stabilization ring and seal clearance for a scroll compressor

F - Mech Eng,Light,Heat,Weapons

04

C

F04C 18/02 (2006.01) F04C 27/00 (2006.01) F04C 29/00 (2006.01) F04D 29/00 (2006.01)

Patent

CA 2232781

An axial compliance mechanism for a scroll-type compressor including a fixed scroll member, an orbiting scroll member and a bearing pad spatially fixed in relationship to the fixed scroll member. The axial compliance mechanism biases the orbiting scroll towards the fixed scroll by applying a fluid at high pressure to a radially inner portion of the back surface of the orbiting scroll member and a relatively lower pressure to a radially outer portion of the back surface. An annular stabilization ring is placed between a main bearing pad and the rear surface of the orbiting scroll lifting the orbiting scroll into engagement with the fixed scroll and inhibiting the tilting and wobbling of the orbiting scroll. The annular stabilization ring also maintains a clearance between the rear surface of the orbiting scroll and the main bearing pad thereby improving the performance of a sealing member disposed between the main bearing pad and the rear surface of the orbiting scroll member during start up of the compressor. The annular stabilization ring lifting the scroll member into engagement with the fixed scroll may be located in a shoulder at theouter periphery of the orbiting scroll member or it may form the annular portion of an Oldham ring which controls the orbiting motion of the orbiting scroll member.

Mécanisme de compliance axiale pour compresseur de type à spirales concentriques comportant une spirale fixe, une spirale orbitale et un patin de support fixé spatialement par rapport à la spirale fixe. Le mécanisme de compliance axiale presse la spirale orbitale en direction de la spirale fixe par application d'un jet de fluide haute pression sur une partie interne, dans l'axe radial, de la face arrière de la spirale orbitale et une pression relativement inférieure sur une partie externe, dans l'axe radial, de la face arrière. Une bague stabilisatrice annulaire est disposée entre un patin de support principal et la face arrière de la spirale orbitale, soulevant la spirale orbitale pour la mettre en prise avec la spirale fixe, inhibant ainsi tout basculement ou ballottement de la spirale orbitale. La bague stabilisatrice annulaire sert aussi à maintenir un jeu entre la face arrière de la spirale orbitale et le patin de support principal, améliorant ainsi le rendement d'un organe d'étanchéité disposé entre le patin de support principal et la face arrière de la spirale orbitale durant la mise en marche du compresseur. La bague stabilisatrice annulaire qui soulève la spirale de manière à la mettre en prise avec la spirale fixe peut être positionnée sur un épaulement situé à la périphérie externe de la spirale orbitale; elle peut aussi constituer la portion annulaire d'une bague d'Oldham utilisée pour commander le mouvement orbital de la spirale orbitale.

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