Abstract: This invention relates to a shutter device for the precision control of a flow, comprising at least one organ for shutting a section for the passage of a flow, the motion of which is proportional to that of an actuator controlling it, wherein said device comprises at least two shutter organs controlled by the actuator by means of a transmission allowing to obtain slightly different proportionality coefficients for the motion of said organs.

Abstract: This invention relates to a flap valve with a shutter and a pneumatic actuator that is integrated into the valve, said actuator comprising a metal bellow interdependent with the shutter, wherein said bellow is directly welded onto an intermediate flange downstream from the valve and directly onto the shutter at the level of an end part upstream from the valve. The invention also relates to the use of such a valve as an isolating stop valve in the aerospace sector, preferably at high or cryogenic temperatures.

Abstract: The test rig of a machine (1) includes a distributed exploitation of the test results, where the signals originating from the sensors (2) are ordered into a single signal, passing through a broad pass-band cable (6), via a common acquisition module (5). The computers (11, 12, 13) in association with miscellaneous display means (7, 8, 9, 10) search for the measurements which interest them on pre-set frames of the signal by using lists of relations contained in a host computer (12).

Abstract: The present invention relates to a bearing for maintaining an inner mobile structural component with revolution symmetry, rotating inside an outer structural component, which is itself fixed or mobile, said bearing comprising a set of balls and at least one joining member which provides the mechanical contact between said balls and said outer structural component, said bearing also comprising a pressurized-oil damper known as a “squeeze film” damper, arranged at the annular contact surface between said joining member and the outer structural component, said bearing comprising at least two annular elastic seals, each arranged in a groove, at the edges of said annular contact surface, wherein the annular elastic seals are U-shaped lip seals, the hollow space of which is directed towards the “squeeze film”, or are E-type seals, the hollow spaces of which are directed towards the “squeeze film”, the leakproofing for each seal being ensured by the contact between said seal and t

Abstract: The present invention relates to a guide vane stage of a compressor comprising an outer ring and an inner ring, which are both concentric and preferably circular. The rings are connected to each other via a series of fixed vanes, and are characterized in that at least the inner ring is provided with holes or apertures which allows one of the ends of the vanes to pass through these holes or apertures. The vanes also have at their end a second aperture intended to allow the passage of a retaining and rigidifying component having an elastic function, in order to hold them in pairs.

Abstract: A process for collecting oxygen-enriched air during a phase of aerobic flight of a space launch for combustion inside at least one cryotechnic rocket engine is provided. The launch rocket comprises at least one turbofan. The turbofan comprises a high-pressure spool comprising a high pressure compressor, a combustion chamber, turbines, and a low-pressure spool surrounding the high-pressure spool. The spools comprise a blower for collecting the external fluid in the form of a main flow and a derived flow. The main flow follows compression, combustion and depressurization in the turbofan engine. The derived flow is separated into oxygen-enriched air and oxygen-depleted air. The oxygen-enriched air is stored for combustion in a rocket engine, while the oxygen-depleted air is ejected.

Abstract: The present invention is related to a bearing for maintaining an inner mobile structural component with a revolution symmetry, rotating inside an outer structural component, which is itself fixed or mobile, said bearing comprising a set of balls or rollers and at least an outer race which provides the mechanical contact between said balls or rollers and said outer structural component, said bearing also comprising a pressurized-oil damper known as a “squeeze film” damper, arranged at the annular contact surface between said outer race and the outer structural component, characterized in that each side surface of the outer race is in contact with a side seal having an annular form, said seals being securely fastened to the outer race by means of a series of anti-rotation fixing members.

Abstract: A guide vane stage of a compressor comprising an outer ring and an inner ring, both of which are concentric and preferably circular is provided. The rings are connected to each other via a series of fixed vanes, characterized in that at least one of the rings is provided with a series of holes or apertures which allow the vanes to pass through these holes or apertures. The fixed vanes also have, at at least one of their ends, an aperture to allow at least one locking element to pass through, making it possible to simultaneously securely fasten all the present in the guide vane stage, on the non-functional side of the ring. The end of the fixed vanes through which the locking element passes is buried in an elastomeric element.

Abstract: The present invention relates to an axisymmetric structural component, one of the ends of which is fitted with an inner circular flange for assembling, by bolting. The axisymmetric structural component with a second axisymmetric structural component. The flange comprises housings for receiving fixing elements such as bolts, pins or threaded rods. The housings are arranged on the circumference of the said flange at regular intervals. Each housing is, in longitudinal section (A—A) along a plane passing through the rotational axis of the component, T-shaped and consists of a first essentially cylindrical portion which is longitudinally open on the inner face (x) of the axisymmetric structural component and transversely open on the contact face (y) of the flange in the assembly. A second essentially semi-cylindrical portion is mounted on the flange which is also longitudinally open on the inner face (x) of the said structural component having an essentially D-shaped transverse section.

Abstract: A reservoir for a liquid circuit has a partition dividing it into an upper chamber and a bottom chamber from which liquid is drawn via an outlet conduit. An inlet conduit for returning liquid to the reservoir opens into a deaerator which is mounted on the partition so that the liquid is returned into the bottom chamber and the separated gas is discharged through a degassing orifice which opens into the upper chamber. The deaerator is provided with a valve which closes the degassing orifice when the reservoir is inverted or subjected or negative gravity, thus ensuring the continuing supply of liquid to the circuit under all operating conditions.

Abstract: A turbomachine stator vane set includes a ring of vanes having platforms arranged in a housing formed on an outer shell. The bottom of the housing has a non-planar surface which is spherical or cylindrical with a radius of curvature R, and the cooperating surface of the platforms has a corresponding non-planar surface which is spherical or cylindrical with a larger radius of curvature R+&Dgr;R prior to fitting and which is reduced to the radius R under stress, by the action of fastening rivets used to assemble the vane platforms with the outer shell.

Abstract: A sealing device for a turbomachine bearing chamber in which a bearing is mounted between a sleeve secured to a rotary shaft and a casing defining said bearing chamber, said sealing device comprising a labyrinth seal disposed on the sleeve at the junction with an adjacent air chamber, a static carbon ring which is not in contact with the shaft and is retained axially in position in a fixed annular support, and a rotary ring which is driven by the sleeve and which is centred without clamping on the sleeve by means of a ring seal and is retained axially in position by a flat annular spring, the rotary ring having a radial surface which faces and co-operates with a radial surface of the carbon ring and which is formed with lift grooves such that, during operation, a substantially frictionless sealing is effected between the two radial surfaces.

Abstract: A rotary displacement pump having a rotatable gear rotor is disclosed, the gear rotor having an outer ring gear with a plurality of internal teeth engaging the external teeth on a pinion gear which is, in turn, attached to a rotatable shaft. The ring gear has an outer diameter that is approximately equal to the diameter of the root circle of the internal gear teeth such that the plurality of teeth are circumferentially spaced apart to form generally radial passageways. The ring gear has one or more annular portions connecting the plurality of internal gear teeth. Each of the internal gear teeth has a forward portion and a rear portion, measured in the direction of rotation of the ring gear, with a tooth profile having a convex forward portion with a radius R1 and a convex rear portion having a radius R2 such that R1>R2.