Variable flow impeller-type water pump with movable shroud

Details Variable flow impeller-type water pump with movable shroud Variable flow impeller-type water pump with movable shroud

F - Mech Eng,Light,Heat,Weapons

01

P

F01P 5/10 (2006.01) F04D 1/00 (2006.01)

Patent

CA 2385897

A variable-capacity water pump includes a housing having an impeller mounted on a rotatable shaft. The pump impeller has a plurality of vanes fixed to a flange. A circumferentially surrounding shroud is axially movable within the housing and may move between extended and retracted positions to surround or expose the vanes and therefore control the effective working capacity of the pump. At low engine speeds, the vanes are fully extended and the maximum amount of kinetic energy is transferred to the coolant. When the rotational speed increases above a certain pre-determined level, the shroud is pushed upwards towards the inlet opening and a portion of the vanes becomes covered. The capacity of the pump decreases and the power required to drive the pump also decreases. Both passive and active control means for the shroud are disclosed.

Une pompe à eau à capacité variable comprend un logement renfermant un rotor monté sur un axe rotatif. Le rotor de la pompe est pourvu d'une pluralité d'aubes fixées à une bride. Une enveloppe montée en circonférence est axialement mobile dans le logement et peut se déplacer entre les positions étendue et rétractée pour entourer ou exposer les aubes et donc réguler la capacité effective de travail de la pompe. € bas régime, les aubes sont en pleine extension et une quantité maximale d'énergie cinétique est transférée au réfrigérant. Lorsque la vitesse de rotation augmente au-dessus d'un certain niveau prédéterminé, l'enveloppe est poussée vers le haut vers l'orifice d'entrée et une partie des aubes est recouverte. La capacité de la pompe diminue et la puissance nécessaire pour actionner la pompe diminue également. Des moyens de commande passive et active de l'enveloppe sont divulgués.

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