Crescent gear pump with novel rotor set

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

Patent

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F04C 2/08 (2006.01) F04C 2/10 (2006.01)

Patent

CA 2596520

A novel crescent gear pump and pump rotor set for a crescent gear pump. The rotor set includes an outer rotor with teeth having a composite profile formed over the portion adjacent their root to conform to a circular arc and formed over the portion adjacent their tip to conform to a hypocycloid arc. The unique shape allows for increased volumetric capacity of the rotor set, when compared to trochoidal rotor sets of the same size. Further, operating noise is reduced, as are pulsations in the output of the pump when compared to the same pump with a trochoidal rotor set.

L~invention a pour objet une pompe à embrayage à griffes d~un genre innovant et un jeu de rotors pour pompe à embrayage à griffes. Le jeu de rotors comprend un rotor extérieur dont les dents présentent un profil composite formé sur la partie adjacente à leurs racines en conformité avec un arc circulaire et sur la partie adjacente à leurs pointes en conformité avec un arc hypocycloïde. Leur forme unique permet une capacité volumétrique accrue du jeu de rotors par rapport aux jeux de rotors trochoïdes de même taille. De plus, le fonctionnement est plus silencieux et les pulsations sont réduites au niveau du débit de la pompe par rapport à la même pompe avec un jeu de rotors trochoïdes.

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