Method for controlling the discharge pressure of an...

F - Mech Eng,Light,Heat,Weapons – 02 – D

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F02D 29/04 (2006.01) F02D 31/00 (2006.01) F02D 41/02 (2006.01) F04B 49/24 (2006.01)

Patent

CA 2660299

A system for controlling the pressure output of an engine-driven centrifugal fire pump includes a discharge pressure sensor mounted in the discharge line of the pump. A governor varies the rpms of the engine in response to pressure changes detected by the discharge pressure sensor. If the pressure in the system is higher than the desired output pressure when the engine is running at its idle speed an electronically controlled hydraulic relief valve responsive to the discharge pressure sensor operates to relieve the excess pressure in over pressure situations. If the pressure in the system is lower than the desired output pressure when the relief valve is fully closed, the engine speed is increased.

Système de régulation de la sortie de pression d'une pompe d'incendie centrifuge entraînée par un moteur, comprenant un capteur de pression de refoulement monté sur le conduit de refoulement de la pompe. Un régulateur modifie la vitesse de rotation du moteur en réponse aux changements de pression détectés par le capteur de pression de refoulement. Si la pression dans le système est supérieure à la pression de sortie désirée quand le moteur tourne au ralenti, un clapet de décompression hydraulique à commande électronique, répondant au capteur de pression de refoulement, est actionné pour évacuer l'excès de pression en cas de surpression. Si la pression dans le système est inférieure à la pression de sortie désirée quand le clapet de décompression est entièrement clos, la vitesse du moteur augmente.

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