Scroll type compressor with variable displacement mechanism

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

Patent

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Details

F04C 29/00 (2006.01) F04C 18/02 (2006.01) F04C 29/10 (1995.01)

Patent

CA 2089783

A variable displacement, scroll-type compressor comprising a housing having fluid inlet and outlet ports. A fixed scroll member, placed within the housing, comprises a first plate from which a first spiral element extends. An orbiting scroll membercomprises a second plate from which a second spiral element extends. A pair of holes are formed through said first plate. A pair of bypass passages place intermediately located sealed-off fluid pockets in communication with a suction chamber. A pair of cylinders are formed within respective bypass passages. A valve member having a first and a second axial end is slidably disposed within each of the cylinders so as to close and open the corresponding bypass passage. A spring is disposed within the cylinder so as to urge the valve member to open the bypass passage. The valve member receives pressure at its first axial end from the intermediately located sealed-off fluid pocket. A three-way electromagnetic valve selectively controls communication between thesecond axial end of the valve member and either the suction chamber or the discharge chamber.

Cette invention concerne un compresseur volumétrique à spirales formé d'un corps ayant un orifice d'admission et un orifice de refoulement. Une spirale fixe placée dans le corps du compresseur comporte une première plaque sur laquelle s'élève un muret spiralé. La spirale mobile a la même configuration. La plaque de la première spirale comporte une paire de trous. Une paire de passages de dérivation mettent en communication des poches de gaz scellées situées entre lesdits trous avec une chambre d'aspiration. Les passages de dérivation renferment chacun un cylindre. Un obturateur ayant un premier et un second bouts dans le même axe est disposé dans chacun des cylndres de manière à pouvoir y coulisser entre une position de fermeture et une position de d'ouverture du passage de déric\vation correspondant. Un ressort placé dans le cylindre pousse l'obturateur vers la position d'ouverture du passage de dérivation. Un fluide sous pression provenant d'une des poches de gaz scellées pousse sur le premier bout de l'obturateur. Une soupape électromagnétique trois voies met en communication le second bout de l'obturateur soit avec la chambre d'aspiration soit avec la chambre de refoulement.

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