Noise reduced variable displacement vane pump

Details Noise reduced variable displacement vane pump Noise reduced variable displacement vane pump

F - Mech Eng,Light,Heat,Weapons

04

C

F04C 29/06 (2006.01) F04C 2/344 (2006.01)

Patent

CA 2638384

[0034] A novel and useful improvement to vane pumps, both variable displacement vane pumps and fixed displacement vane pumps, provides a supply of pressurized fluid to the region within the diameter of the pump rotor which would otherwise be a region of reduced pressure wherein air could be ingested by the pump. By reducing or preventing the ingestion of air, operating noise and damage to the pump can be reduced and wear in an engine or other system supplied from the pump can be reduced. The supply of pressurized working fluid also can be used to lubricate auxiliary components and/or accessories as well. Further, a portion of the supply of pressurized working fluid to this region can act to supercharge the pump, reducing the occurrence of cavitation at higher operating speeds.

L'invention a pour objet d'atténuer le phénomène qui survient dans les pompes à palettes classiques, où la région au centre du rotor se trouve à une pression réduite, ce qui peut provoquer l'ingestion d'air dans celle-ci, contribuant ainsi au bruit de fonctionnement et pouvant occasionner des dommages à la pompe. Une pompe (100) à palettes est pourvue d'un carter (102) de pompe, d'un compartiment de rotor comprenant un orifice d'entrée (128) et un orifice de sortie (132), d'un rotor (104) en interaction étanche avec le compartiment de rotor et définissant un compartiment (148) de cAEur intérieur et une pluralité de compartiments (120) de pompage extérieurs, et d'un passage (144) s'étendant de l'orifice de sortie (132) au compartiment (148) de cAEur intérieur. Le passage (144) apporte une source de fluide sous pression au compartiment (148) de cAEur intérieur pour réduire l'ingestion d'air.

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