Recirculation valve in an aircraft engine

摘要

The present invention relates to an installation for lubricating and/or cooling in an aircraft engine comprising an oil tank (3), a main feed pipe (6) feeding a main pump (1) supplying a flow in a discharge line from the main pump (7) to one or several systems (2) to be lubricated and/or cooled, wherein the installation comprises a feed pipe for an auxiliary pump (8) fitted in parallel onto the main pipe (6) and connected to an auxiliary feed pump (1A), the latter supplying a flow in a discharge line from the auxiliary pump (8A) connected by a three-way circuit on the one hand to a non-return valve (4A) directed towards the main discharge line (7), and on the other hand to a hydraulically-operated (9) recirculation valve (5), in order to divert the flow from the auxiliary feed pump (1A) into a return line (8B) directly towards the tank (3).

主权项

1. Lubrication and/or cooling installation in an aircraft engine comprising an oil tank (3), a main feed pipe (6) feeding a main pump (1) and an auxiliary feed pump (1A), said main feed pipe (6) supplying a flow in a main discharge line (7) from the main pump (1) to one or several systems (2) to be lubricated and/or cooled, wherein the installation comprises a feed pipe (8) for the auxiliary pump (1A), said feed pipe (8) being connected at one end to the main feed pipe (6) and to at another end to the auxiliary feed pump (1A) and being fitted in parallel onto the main pipe (6), the auxiliary feed pump (1A) supplying a flow in a discharge line (8A) via a three-way circuit, the discharge line (8A) being connected on the one hand to a non-return valve (4A) directed towards the main discharge line (7), and on the other hand to a recirculation valve (5), said recirculation valve (5) being hydraulically controlled (9) by the oil pressure of the main discharge line (7) in order to open when said oil pressure reaches a predetermined value and to divert all the flow from the auxiliary feed pump (1A) into a return line (8B) directly towards the tank (3) or towards the main feed pipe (6) upstream from the main pump (1), said recirculation valve being otherwise closed so that all the flow from the auxiliary feed pump (1A) is diverted into the main discharge line (7) via the opened non-return valve (4A).