Device for depressurizing at least one chamber (E1, E2) of a turbomachine (1) intended to accommodate at least one bearing (7, 8) of a rotor of said turbomachine, which bearing is supplied with lubricating oil under pressure by a feed pump (15) and by an oil feed duct (16), said device comprising at least one breather tube (10) connected to said chamber in order to extract an oil mist therefrom, an oil separator (30) able to separate the oil from the air in said mist and a jet pump (11) pneumatically connected to said chamber by said breather tube and said oil separator, said pump comprising a pump tube (17) into which there open a primary circuit (21) supplied with fluid under pressure via a fluid feed duct and a secondary circuit (22) connected to said oil separator in order to place the chamber under a reduced pressure, characterized in that the primary circuit (21) comprises at least two pressurized-fluid injectors (13, 24) positioned in said tube and fed independently of one another.
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