Pump drive head backspin retarder

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

Patent

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F04B 9/10 (2006.01) F01C 21/00 (2006.01) F04C 29/00 (2006.01)

Patent

CA 2187579

A pump drive head backspin retarder includes a vane pump having an impeller with a plurality of spring loaded vanes and a pawl clutch centrally disposed in the impeller and having a hub and a plurality of pawls. Each pawl is pivotally attached to the hub for movement between first and second positions. The impeller includes a plurality of pawl receiving recesses, whereby, for a first direction of rotation, pawls of the pawl clutch pivot to the first position corresponding to a disengaged state for providing no mechanical contact with the impeller and, for a second direction of rotation opposite the first, pawls of the pawl clutch pivot to the second position due to inertia corresponding to an engaged state thereby engaging corresponding pawl receiving recesses.

Ralentisseur de contre-rotation pour tête d'entraînement de pompe comportant une pompe à palettes constituée d'un rotor doté d'une pluralité de palettes radiales commandées par ressort et d'un engrenage à linguets monté au centre du rotor et comportant un moyeu et une pluralité de linguets. Chaque linguet est monté en pivotement sur le moyeu, ce qui assure leur mobilité entre une première et une deuxième positions. Le rotor comporte une pluralité d'encoches dans lesquelles les linguets vont se loger pour assumer une première position correspondant au désenclenchement du rotor; lors d'une rotation dans le sens opposé, l'inertie fait pivoter les linguets vers leur deuxième position dans les encoches pratiquées dans le rotor, position qui correspond à l'état d'embrayage du rotor.

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