Hydromechanical control for a variable delivery positive...

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

Patent

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Details

F02M 59/20 (2006.01) F02C 7/232 (2006.01) F02C 9/30 (2006.01) F02C 9/38 (2006.01) F02D 9/08 (2006.01)

Patent

CA 2206919

A hydromechanical control system for a variable delivery, positive displacement fuel pump includes a variable area orifice metering window through which fuel from the pump outlet passes on its way to a gas turbine aircraft engine. The fuel pressures on either side of the fuel metering window are ported to corresponding sides of a spool of a pump control valve. The position of the valve spool controls the fuel flow to either side of a pump control actuator, whose movement varies the displacement of the pump. A bypass fuel flow upstream of the fuel metering valve is also ported to the pump control valve. During steady-state pump operation, a relatively small and constant value of fuel flow is bypassed through the pump control valve and back to the pump inlet. However, upon increasing or decreasing pump speed transients, the bypass fuel flow is increased or decreased in a proportional amount. In this way, improved control of the pump during transient conditions is achieved.

Cette invention concerne un dispositif de commande hydromécanique de pompe à essence volumétrique à débit variable, comportant un dispositif de mesure à orifice de section variable par lequel passe le carburant refoulé par la pompe vers la turbine à gaz d'un aéronef. La pression du carburant de part et d'autre du dispositif de mesure est reportée de part et d'autre du tiroir de la valve de commande de la pompe. La position du tiroir règle le débit de carburant acheminé de part et d'autre d'un mécanisme dont le mouvement fait varier le débit de la pompe. Une dérivation relie la canalisation de refoulement de la pompe en amont du dispositif de mesure à la valve de commande de la pompe. En régime établi, une quantité relativement faible et constante de carburant est retournée à l'entrée de la pompe via cette canalisation de dérivation et la valve de commande de la pompe. En régime transitoire, la quantité de carburant retournée à la pompe est plus ou moins grande, selon que la vitesse de fonctionnement de la pompe augmente ou diminue. Le dispositif de cette invention permet ainsi une meilleure régulation du débit en régimes transitoires.

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