Improved suction inlet for rotary compressor

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

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F04C 29/00 (2006.01)

Patent

CA 2200290

A suction inlet passage in a cylinder block of a rotary compressor includes a generally symmetrical diverging port which has generally conic cross-sections that divergingly open into a cylinder bore. The diverging port provides a buffer cavity which reduces pulsations and associated noise. The suction inlet passage is further provided with an entrance passage and a converging passage, which is disposed between the entrance passage and the diverging port and which has a smaller cross-section than either the entrance passage or the diverging port. The suction inlet passage serves as a diffuser with the converging passage functioning as the throat of the diffuser so as to increase volumetric efficiency with respect to the suction gas entering the cylinder bore. The diverging port extends the point of suction inlet close-off, and correspondingly enlarges the close-off angle, resulting in extending the period of unclosed compression and enhancing the supercharging effect. In this manner, the improved suction inlet passage increases volumetric efficiency, reduces pulsations and associated noise, and increases the pressure of the suction gas in the cylinder bore at the beginning of the compression cycle.

Passage d'aspiration dans un bloc-cylindres d'un compresseur rotatif comportant un orifice divergent généralement symétrique dont les sections généralement coniques s'ouvrent de façon divergente dans l'alésage d'un cylindre. L'orifice divergent fournit une cavité d'amortissement qui réduit les vibrations et le bruit qui leur est attribué. Le passage d'aspiration contient en outre un passage d'entrée et un passage convergent, qui est placé entre le passage d'entrée et l'orifice divergent et qui possède une section plus petite que le passage d'entrée ou que l'orifice divergent. Le passage d'aspiration sert de diffuseur pour le passage convergent qui agit comme l'étrangleur du diffuseur, de façon à augmenter l'efficacité volumétrique en ce qui a trait au gaz d'aspiration s'introduisant dans l'alésage d'un cylindre. L'orifice divergent allonge le point de fermeture de l'aspiration, et de ce fait même agrandit l'angle de fermeture, parvenant ainsi à prolonger la durée de compression non fermée et à améliorer l'effet de surcompression. De cette façon, le passage d'aspiration amélioré augmente l'efficacité volumétrique, réduit les vibrations et le bruit qui leur est attribué et augmente la pression du gaz d'aspiration dans l'alésage du cylindre au début du cycle de compression.

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