FR3011270A1 - DEVICE FOR CONNECTING A FIXED PART OF A TURBOMACHINE AND A DISTRIBUTOR FOOT OF A TURBOMACHINE TURBINE - Google Patents

Abstract

Connecting device (1) of a fixed part of a turbomachine (2) and a distributor foot (31) (3), comprising an annular flange (111), to be connected integrally to the fixed part (2) and connected to the foot (31), comprising: - an annular mechanical holding plate (8), for connecting the fixed part of the turbomachine (2) and the foot (31), extending between and separating upstream chambers (4) and downstream (5), - an annular sealing plate (9), elastically deformed, to prevent fluid flow between the upstream (4) and downstream (5) chambers, arranged upstream of the mechanical holding plate (8) and comprising a first edge (91) integrally connected to the mechanical holding plate (8), and a second edge (92) held in abutment against a bearing surface (83) of the mechanical holding plate (8) by elastic deformation of the sealing plate (9) forming a sealed contact.

Description

DEVICE FOR CONNECTING A FIXED PART OF TURBOMACHINE AND A DISTRIBUTOR FOOT OF A TURBOMACHINE TURBINE TECHNICAL FIELD This is a question of the technical field of aircraft turbomachines. In particular, it is a question of the field of devices adapted to connect a distributor foot and a fixed part of a turbomachine. STATE OF THE ART Connection devices, as illustrated in FIGS. 1 and 2, are known from a fixed part of a turbomachine, for example an inter-turbine casing 2, and a distributor's foot. a turbomachine turbine, for example a turbomachine low pressure turbine. Such devices comprise one or more pieces having an annular shape so as to extend 360 ° around a turbomachine shaft.

Such devices typically comprise an annular flange 111 adapted to be integrally connected to the fixed part of a turbomachine, for example to the inter-turbine casing 2. The flange 111 is adapted to be connected to the foot 31 of the distributor 3, typically of a to allow radial sliding of the foot 31 of the distributor 3. Such a device makes it possible, among other things, to isolate upstream 4 and downstream 5 chambers 5 from each other, the upstream 4 and downstream 5 chambers being arranged upstream and downstream respectively. downstream of the distributor foot 31.

However, during normal operation of the turbomachine, the upstream of the device is subjected to a large thermal radiation from the fixed portion of the turbomachine, for example the inter-turbine casing 2.

Parts of the device exposed to such radiation can reach high temperatures, typically of the order of 800 to 1100 ° C. In particular, the flange 111 of the device 1 then reaches high temperatures, typically of the order of 500 ° C to 850 ° C and expands.

This results in stresses tending to a flow of the flange 111 downstream, typically in the direction and direction of the arrow 501. This causes a moment of tilting or unwinding of the entire device 1 downstream. However, the presence of the foot 31 of the dispenser prevents the unwinding of the device. The foot 31 of the distributor is then subjected to the corresponding efforts. As illustrated in FIG. 2, the distributor is typically blocked at the top by hooks of the casing of the turbomachine opposing these forces, typically by exerting efforts in the direction and direction of the arrows 502. The distributor 3 is therefore subjected to constraints that reduce its life and may cause it to rupture. In addition, these constraints result from thermal gradients in a small area. Thus the stresses can vary greatly depending on the conditions to which the flange 111 is subjected and are difficult to predict. SUMMARY OF THE INVENTION An object of the invention is in particular to reduce the stresses to which the dispenser is subjected. For this purpose, there is provided a device for connecting a fixed part of a turbomachine and a distributor leg of a turbomachine turbine, comprising an annular flange, the flange being adapted to be connected in solidarity with the fixed part of the turbomachine and to be connected to the foot of the distributor, the flange comprising: an annular mechanical holding plate, adapted to form a connection between the fixed part of the turbomachine and the distributor foot, the mechanical holding plate extending between and separating an upstream chamber and a downstream chamber disposed respectively upstream and downstream of the distributor foot, and an elastically deformed annular sealing plate, adapted to prevent fluid flow between the upstream chamber and the downstream chamber, the plate of sealing being disposed upstream of the mechanical holding plate and comprising a first edge connected integrally to the holding plate m echanical, and a second edge held in abutment against a bearing surface of the mechanical holding plate due to the elastic deformation of the sealing plate, so as to form a sealing contact between the sealing plate and the surface support of the mechanical resistance plate.

The presence of the sealing plate makes it possible to limit the rise in temperature of the flange, in particular of the mechanical holding plate, by limiting, or at least partially blocking, a heat transfer by convection and / or conduction of the fluid of the fluid. vein to the flask.

This results in a large decrease in the magnitude of the tilting moment of the device downstream. Thus, the tilting forces exerted on the distributor foot by the device are then reduced even further, decreasing the wear of the distributor and the risk of rupture of the distributor at a stress zone. It is thus possible to reduce the stresses to which the distributor is subjected. Another advantage is to increase the robustness of the system, particularly from the thermal point of view.

The invention is advantageously completed by the following features, taken alone or in any of their technically possible combinations: the sealed plate is adapted to at least partially block thermal radiation from the fixed part of the turbomachine and directed towards the holding plate mechanical, the mechanical resistance plate comprises a first edge adapted to be integrally connected to the fixed turbine engine part by first connection means secured to the mechanical holding plate and a second edge adapted to be connected to the distributor foot by second connection means of the mechanical resistance plate, the first or second connection means comprise the bearing zone, the second connection means comprise two upstream and downstream annular flanges integral with the mechanical holding plate, the two flanges being adapted to come pinch the foot of the dispenser, the z one support is a surface of the upstream flange of the mechanical strength plate, the mechanical strength plate comprises at least one opening softening the mechanical strength plate, the first edge of the waterproof plate is an inner edge, the second edge being an outer edge disposed downstream of the inner edge. The invention also relates to a turbomachine turbine comprising a device as described above.

The invention furthermore relates to a turbomachine comprising a device as described above. DRAWINGS Other objectives, characteristics and advantages will appear on reading the description which follows, which is given by way of nonlimiting illustration with reference to the drawings, among which: FIG. 1 represents a sectional view of a device according to the prior art, FIG. 2 represents the forces applied to a turbine distributor connected to a device according to the prior art; FIG. 3 represents a sectional view of FIG. FIG. 4 shows a sectional view of a detail of a device according to another exemplary embodiment of the invention, and FIG. 5 represents a view of a device according to an exemplary embodiment of the invention. front view of parts of a flange of a device according to another exemplary embodiment of the invention. DESCRIPTION With reference to Figure 3, there is described a connection device 1 of a fixed part of a turbomachine and a foot 31 of distributor 3 of a turbomachine turbine according to an exemplary embodiment.

Turbomachine General structure The turbomachine is for example a turbine engine of the fan-cooled type or the non-ducted fan (in English - open rotor "or" unducted fan ") of an aircraft. The turbomachine is typically organized along an axis called turbomachine axis.

Typically, a flow of air entering the turbomachine at an air inlet is compressed and then mixed with fuel and burned in a combustion chamber, the combustion gases for rotating a rotor or several turbine rotors around an axis of the turbomachine. The turbomachine comprises for example a high pressure turbine for driving a high pressure compressor, and a low pressure turbine for driving a low pressure compressor and a fan.

By interior or central, and external or peripheral, here qualifies elements according to their distance relative to an axis (not shown) of the turbomachine on which the device is intended to be installed, when the device 1 is in operating position . Similarly, "over" means that disposed at a relatively greater distance from the shaft of the turbomachine, and "below" is understood to be disposed at a relatively shorter distance from the shaft of the turbine. turbomachine when the device 1 is in the operating position. In this way, an element that is relatively closer to a shaft of the turbomachine is described as interior. In the same way, an element relatively far from the shaft of the turbomachine is termed external. Thus, in a given element, a qualified interior or central part is typically arranged at a relatively smaller distance from the axis of the turbomachine than a qualified part of outside or peripheral, when the device 1 is in position Operating.

Upstream and downstream, we call here elements according to their relative position along the axis of the turbomachine. An upstream component is thus described that is relatively closer to an air inlet of the turbomachine or further from an air outlet of the turbomachine, typically a nozzle. Similarly, here downstream is described an element relatively more distant from the air inlet of the turbomachine or closer to the air outlet of the turbomachine. Typically, the upstream and downstream terms refer to the general direction of air circulation in the turbomachine between its inlet and outlet.

Axial and respectively radial elements are described as being relative to an axial or radial direction of the turbomachine. The connection device is typically disposed at a turbine. The connection device is for example arranged at the inlet of the turbine, at the connection between the fixed part of the turbomachine and the low pressure turbine, for example at the inlet of the low pressure turbine downstream of the high pressure turbine, for example at the connection between the inter-turbine casing 2 and the low pressure turbine.

Turbomachine fixed part The fixed turbomachine part is distinct from the distributor foot 31 3. The fixed turbine engine part is for example a casing, for example an inter-turbine casing 2. The inter-turbine casing 2 is typically an intermediate casing between two parts of the turbomachine. The inter-turbine casing 2 can be interposed between the high pressure and low pressure turbines housed in their respective casings. The inter-turbine casing 2 comprises for example inner and outer walls defining a stream 71 flow circulation between the high pressure and low pressure turbines, and arms extending between the inner and outer walls. The turbine typically comprises a plurality of stages each with a distributor receiving a flow of gas and straightening it to apply to a rotating wheel in a given direction. The turbine is typically a low pressure turbine. Dispenser The distributor 3 is for example a low pressure distributor 3 disposed at the inlet of the low pressure turbine, that is to say the upstream distributor of the low pressure turbine, typically disposed downstream of a turbine fluid rectifier. high pressure, for example directly downstream of the rectifier, or downstream of a wheel disposed itself downstream of the rectifier. Alternatively, the distributor may be disposed downstream of the low-pressure turbine, or at another turbine. The distributor 3 comprises a head and a foot 31 held stationary in the turbomachine. The distributor 3 is disposed substantially radially, the foot 31 being turned inwardly and the head outwardly. The head is typically fixed by hooks of a casing of the turbomachine. The foot 31 is fixed to the connection device.

General structure of the annular flange The device comprises a flange 111. The flange 111 is annular, that is to say that it has an annular shape. The flange 111 is adapted to be connected to the foot 31 of the dispenser. The flange 111 is adapted to be integrally connected to the fixed part of a turbomachine, typically to the inter-turbine casing 2. By a solid connection between two elements, it is generally understood that the connection is such that a movement of one elements according to one degree of freedom implies the same movement of the other element according to the same degree of freedom. The solidarity connection is for example a fixing. This connection ensures the maintenance of the foot 31 of the dispenser. Mechanical Retention Plate General Structure The flange 111 comprises a mechanical seal plate 8. The mechanical seal plate 8 is annular, i.e., annular in shape. Annular form comprises a shape extending substantially around a given axis, the shape being located in an area between a first cylinder of central revolution centered on the axis and having a first radius and a second cylinder of revolution device centered on the axis and having a second radius larger than the first radius. In other words, the annular shape extends substantially around the axis, remaining at a minimum distance from the axis, in the manner of a ring.

An annular shape thus typically comprises a shape having a substantially rounded outer contour and having a central orifice. The annular shape may be continuous, that is to say that its projections in planes orthogonal to the axis comprise a closed loop arranged around the axis.

The annular shape can be interrupted, that is to say that its projections in orthogonal planes to the axis comprise a loop having at least one interruption, that is to say one or a plurality of interrupts. The interruption can interrupt the form from side to side, in the manner of a C, or only partially, that is to say that a closed loop surrounds the axis, the closed loop being in at least one zone significantly less thick than the rest of the form. The mechanical resistance plate 8 is adapted to form a connection between the fixed portion of the turbomachine and the foot 31 of the distributor. It is thus possible for the flange to be connected with the fixed part of the turbomachine, typically the inter-turbine casing 2, and the foot 31 of the distributor when the device 1 is positioned in the turbomachine. The mechanical resistance plate 8 extends between and separates an upstream chamber 4 and a downstream chamber 5. The upstream chamber 4 is typically arranged between the fixed part of the turbomachine, typically the inter-turbine casing 2, and the flange 111. The upstream chamber 4 and the downstream chamber 5 are respectively disposed upstream and downstream of the foot 31 of the distributor when the device 1 is positioned in the turbomachine. The mechanical resistance plate thus ensures the connection of the flange 111 to the inter-turbine casing 2 and the foot 31 of the distributor. The mechanical holding plate thus ensures the foot holding function 31 of the dispenser. The mechanical holding plate 8 may comprise a first edge 81 and a second edge 82. The two edges 81 and 82 may form an inner edge and an outer edge. Preferably, the inner edge is disposed upstream of the outer edge. Integral Connection to the Fixed Turbomachine Part The integral connection of the mechanical holding plate 8 to the fixed turbine engine part, typically to the inter-turbine casing 2, can be achieved by any means known to those skilled in the art. The integral connection is for example made by first connection means secured to the mechanical holding plate 8.

Preferably, the first edge 81 of the mechanical resistance plate 8 may be adapted to be connected integrally to the fixed part of the turbomachine, typically to the inter-turbine casing 2, by the first connection means secured to the holding plate 8. Preferably, the first edge 81 is an inner edge of the mechanical holding plate 8. The integral connection between the first edge 81 and the fixed part of the turbomachine can thus be made by welding (not shown). Alternatively, the first connection means may comprise at least one fastening flange 112, arranged for example at the first edge 81. Such a fastening flange 112 typically has an orifice through which a fastening element 113 can be inserted, typically a bolt-type element, as shown, typically of a screw-nut type element. The fastening element 113 may be adapted to pass through an orifice of the fixed turbine engine part, typically of the inter-turbine casing 2, or of an intermediate connection element 114 comprising, for example, dedicated flanges coming to grip a wall of the part This type of intermediate connection element 114 may be included in the device 1 or may form a separate element of the device 1. It will be understood that such an arrangement may be reproduced several times along the length of the turbine. annular structure of the mechanical holding plate 8 so as to ensure better fixation.

Connection to the distributor foot The connection of the mechanical seal plate 8 to the foot 31 of the distributor can be achieved by any means known to those skilled in the art.

The connection is for example made by second connection means of the mechanical resistance plate 8. The connection may for example allow a radial sliding of the foot 31 of the distributor relative to the mechanical resistance plate 8. The connection is for example a connection secured in translation along the axis of the turbomachine, preferably also integral in rotation along axes orthogonal to the axis of the turbomachine, preferably integral in rotation regardless of the axis. Preferably, the connection is integral in rotation and integral in translation except along the radial axis, that is to say that the only allowed relative movement is the translation along the axis orthogonal to the axis of the oriented turbomachine in the same direction as foot 31; in other words the connection may allow only a radial sliding of the foot relative to the mechanical resistance plate 8. The connection may alternatively be a connection secured in translation and in rotation. Preferably, the second edge 82 of the mechanical seal plate 8 can be adapted to be connected to the foot 31 of the distributor by the second connection means of the mechanical seal plate 8. Preferably, the second edge 82 is an outer edge of the plate 25 of mechanical strength. In the case where the connection is a connection secured in translation and rotation, the integral connection between the second edge 82 and the foot 31 may be made by welding (not shown). Alternatively, the second connection means may comprise two flanges, an upstream flange 12 and a downstream flange 13. The flanges 12 and 13 are preferably annular flanges, that is to say that they each have an annular shape.

By annular flange generally means a fixing piece of annular shape, that is to say pierced in its center, and typically having orifices at its periphery to allow attachment to another element, typically another element forming flange.

The flanges 12 and 13 are for example each integral with the mechanical resistance plate 8. The connection of a flange 12 or 13 to the rest of the mechanical seal plate 8 may be a direct connection to the mechanical seal plate 8 or by through an intermediate portion, and / or through the other flange. The integral connection can thus be made by welding between the mechanical resistance plate 8 and the flange 12 or 13, or the mechanical resistance plate 8 and the flange 12 or 13 can be made so as to form a single piece.

Alternatively or in addition, the flange 12 or 13 may be mounted integral with the mechanical seal plate 8. According to one example, the flange 12 or 13 may comprise at least one fixing orifice 136. Such a fixing orifice 136 may be arranged so that a fastener 137 can be inserted therethrough, typically a screw-nut type member, typically of the bolt type, as shown in FIG. 3. The fastening element 137 can be adapted to pass through an orifice of the mechanical holding plate 8 and / or an intermediate connection element, typically the other flange.

It is understood that such an arrangement can be reproduced several times along the annular structure of the mechanical seal plate 8 so as to ensure better fixation. With reference to FIG. 3, one of the flanges, typically the upstream flange 12, can form only one piece with a part of the mechanical holding plate 8 extending between this flange and the first solidarity connection means. The other flange, typically the downstream flange 13, can then be mounted integral with the upstream flange 12 by means of fastening elements 137 passing through aligned orifices of the two flanges 12 and 13, each flange 12 and 13 having a plurality of holes distributed along their annular structure. The two flanges 12 and 13 are for example adapted to pinch the foot 31 of the dispenser. The two flanges 12 and 13 thus form a clamp.

The two flanges 12 and 13 thus come into contact with the foot 31 of the distributor, on either side of the distributor, in order to maintain it in position in the turbomachine. The two flanges 12 and 13 typically come into contact with the foot 31 of the distributor at respective ends 125 and 135, the ends also forming the second edge of the mechanical holding plate 8. For this purpose, the flanges 12 and 13 are typically arranged so that the ends 125 and 135 of the two flanges 12 and 13 are separated from a space, this space forming a receiving space of the foot 31 of the dispenser.

The size of the space can typically be adjusted, for example by connection means of a flange 13 to the other 12, for example connection means 136 and 137 as described above. In order to obtain a tight contact zone, it is possible to arrange a sealing element comprising one or more sealing pieces, for example one or more sealing plates or plates, typically sealing plates 312 and 313. between each flange 12 and 13 and the foot 31 of the dispenser. Between the at least one of the flanges 12 and / or 13 and the foot 31, the sealing element can thus be formed of a plurality of distinct sealing pieces distributed along the zone disposed between the flange and the flange. foot 31, the damping parts being separated from each other so as to form interruptions of the sealing element. The upstream flange 12 and / or downstream flange 13 may have scalloping, typically between fixing orifices, typically between the fixing orifices 126 of the upstream flange 12 and between the fixing orifices 136 of the downstream flange 13. By festooning, one means that the orifices are placed between notches giving the upstream flange 12 and / or annular downstream flange 13 a shape "festoon" or, in other words, a crenellated form with typically rounded edges. The feasting makes it possible to reduce the quantity of material necessary for the manufacture of the flange in question.

Ajour The mechanical resistance plate 8 may comprise at least one aperture 84. The at least one aperture is dimensioned to soften the mechanical resistance plate 8.

The aperture thus forms an opening connecting the upstream and downstream of the mechanical resistance plate 8. The at least one aperture is typically formed at an intermediate zone of the annular holding plate 8 disposed between its edge inner 81 and its outer edge 82, typically between the first connection means and the second connecting means of the mechanical holding plate 8. The at least one ajour may comprise a plurality of openings. The openings may be uniformly distributed over the circumference of the mechanical holding plate 8 so as to ensure a mechanical and / or dynamic balance of the mechanical strength plate. The mechanical holding plate 8 may thus comprise a plurality of openings, as shown in FIG. 3. The at least one aperture may have different shapes. The at least one aperture may for example have a circular and / or oblong shape, and / or triangular, and / or rectangular.

The shape is dimensioned so as to allow sufficient mechanical strength and so as to limit the mass of the mechanical resistance plate 8. As illustrated in FIG. 5, a mechanical holding plate 8 can comprise a plurality of triangular-shaped openings 842, typically oriented head to tail so as to increase the number of openings. The mechanical strength plate 8 may also comprise one or more openings 8 of another shape, typically at least one rectangular shaped aperture 844.

Sealing plate General structure The flange 111 comprises a sealing plate 9. The sealing plate 9 is annular, that is to say that it is annular. In normal use, the sealing plate 9 is elastically deformed. The sealing plate is adapted to prevent fluid flow between the upstream chamber 4 and the downstream chamber 5. This sealing allows for example to prevent hot air circulation on certain elements arranged downstream, typically turbine disks, so as to allow better mechanical strength. The sealing plate 9 includes a first edge 91 and a second edge 92. The first edge 91 of the waterproof plate 9 may be an inner edge, and the second edge 92 may be an outer edge disposed downstream of the inner edge. The first edge 91 is integrally connected to the mechanical holding plate 8.

The second edge 92 is held in abutment against a bearing surface 83 of the mechanical holding plate 8 due to the elastic deformation of the sealing plate 9, so as to form a sealing contact between the sealing plate 9 and the bearing surface 83 of the mechanical seal plate 8. The sealing plate 9 is disposed upstream of the mechanical seal plate (8). The two main functions of the flange 111, namely the mechanical strength of the foot 31 of the distributor and the sealed separation of the upstream chamber 4 and the downstream chamber 5 are thus dissociated between the two plates of the flange 111 according to the invention.

A first advantage is therefore to be able to separately size the two elements so that each ensures its function, without having to size a single wall capable of performing both functions, which is the case in the interior art.

The embodiment of the flange according to the invention is therefore simpler and less expensive because it is sufficient to make each wall in the material and the dimensions specific to its function and not to have to combine them. The mechanical resistance plate 8 can for example be made entirely or at least partially in Inco net 718. The sealing plate 9 can be made entirely or at least partially in HA188. Moreover, the separation of functions makes it possible to optimally size each of the plates separately. In addition, as previously described, the sealing plate 9 is disposed upstream of the mechanical holding plate 8 and has a first edge connected to the mechanical holding plate 8 and a second edge in contact with the mechanical holding plate 8 Thus, the sealing plate 9 sealingly separates at least a portion of the mechanical holding plate 8 and the upstream chamber 4.

However, as indicated above, when the turbomachine is in operation, the upstream chamber 4 is subjected to high temperatures. In particular, the sealing plate 9 is thus adapted to prevent a contact of a fluid with at least a part of the mechanical holding plate 8, the fluid coming from a stream 71 of the turbomachine in the form of a vein fluid flow 73, the fluid being able to enter the chamber 4. The sealing plate 9 is thus adapted to limit heat transfer by convection and / or conduction of the upstream chamber 4 to the mechanical holding plate 8, in particular from the vein fluid to the mechanical holding plate 8. As illustrated in FIG. 3, the chamber 4 is typically fluidly connected to the stream 71 disposed above the upstream chamber 4 and the flange 111 in the turbomachine. This fluid is thus a turbine outlet fluid, typically an output fluid from the high pressure turbine, and is therefore at an elevated temperature greater than 1000 ° C. During operation of the turbomachine, the upstream of the device 1 is subjected to possible return of the vein fluid at high temperature.

The arrival of fluid from this vein 71 may be limited by introducing into the chamber a colder purge flow and thus maintain a sufficient pressure in the chamber to prevent the introduction of fluid from the vein 71.

This purge flow typically comes from the high pressure compressor. However, during the operation of the turbomachine, this purge flow can be decreased and / or the pressure of the vein fluid 71 can be increased, so that a flow of vein fluid 73 enters the chamber 4.

In the prior art, this stream of vein fluid 73 thus participates, by thermal transfer phenomena by conduction and convection, to the temperature rise of the flange 111 and therefore to its expansion, to its extension. This results in stresses tending to unfold the flange 111 downstream. This causes a tilting moment or unwinding of the entire device 1 downstream and therefore an even faster wear of the distributor 3. However, unlike the prior art, the presence of the plate 9 can limit the rise in temperature of the flange 111, in particular of the mechanical resistance plate 8, by limiting, or at least partially blocking, a heat transfer by convection and / or conduction of the vein fluid to the flange 111. This results in a sharp decrease in the magnitude of the tilting moment of the device 1 downstream. Thus, the tilting forces exerted on the foot 31 of the dispenser by the device 1 are then reduced even further, thereby decreasing the wear of the distributor 3 and the risk of rupture of the distributor 3 at a stress zone 32. Similarly, it is thus possible to reduce the fatigue of the distributor 3, that is to say the wear due to the periodic succession of stresses between the passage of the turbomachine from a non-operating state to a state normal operation and between the passage of the turbomachine from a normal operating state to an off state.

Thus, in addition to reducing overall the forces exerted on the foot 31 of the distributor 3, the invention can further reduce the fatigue phenomenon of the distributor 3 caused by the periodic repetition of forces exerted on the foot 31 of the dispenser.

The sealing plate, which in turn is fully subject to heat transfer by convection and / or conduction with the fluid present in the upstream chamber 4, is however only connected integrally at its first edge 91. The second edge 92 being only maintained in support by elastic deformation, the sealing plate 9 is free at this second edge and the sealing plate can then deform without causing significant stress. The unfolding phenomenon associated with the rise in temperature of the sealing plate 9 is typically downstream, the sealing contact can be maintained and the function of the sealing plate 9 preserved.

In particular, unlike the prior art, the deformation of the flange 111 is mainly at the level of the sealing plate 9 and therefore does not imply strong constraints on the foot 31 of the distributor because the latter is not connected to the sealing plate 9 but to the mechanical holding plate 8.

In addition, the watertight plate 9 may be adapted to at least partially block thermal radiation coming from the inter-turbine casing 2 and directed towards the mechanical resistance plate 8. During normal operation of the turbomachine, the upstream of the device 1 is subjected to a significant thermal radiation from the fixed part of a turbomachine, typically a casing, typically the turbine casing 2. This radiation is due to an elevated temperature of the fixed part of the turbomachine. In the devices according to the prior art, the flange 111 of the device, exposed to such radiations, reaches high temperatures when the turbomachine is in operation, the temperatures being of the order of 900 ° C., and reaching temperatures typically of the order of 1100 ° C.

In particular, in these devices according to the prior art, the flange 111 of the device 1, then reaching high temperatures, tends to expand, to expand. This results in stresses tending to unfold the flange 111 downstream. This causes a moment of tilting or unwinding of the entire device 1 downstream. However, compared with the prior art, the presence of the sealing plate 9 according to the invention makes it possible to limit the rise in temperature of the mechanical holding plate 8 which is in connection with the foot 31 of the distributor, by blocking at least partially thermal radiation from the fixed portion of a turbomachine, typically a housing, typically the inter-turbine casing 2, and directed to the mechanical resistance plate 8. This results in a further decrease in the magnitude of the moment tilting of the device 1 downstream, or even its disappearance. Indeed, in the case of the device according to the invention, the stresses are further reduced with respect to the device according to the prior art, because the temperature of the mechanical resistance plate 8 during operation of the turbomachine is further reduced. because of the lower heat transfer by radiation and the expansion phenomenon of the flange 111 is even more strongly reduced.

Thus, the tilting forces exerted on the foot 31 of the dispenser by the device 1 are then further reduced, decreasing even more the wear of the distributor 3 and the risk of rupture of the distributor 3 at a zone of stress 32. The sealing plate 9 also makes it possible to reduce the fatigue of the distributor 3 resulting from the fact that the foot 31 is subjected to periodic stresses between the passage of the turbomachine from a non-operating state and to an operating state normal and between the passage of the turbomachine from a normal operating state to an off state. Thus, in addition to further reducing the forces exerted on the foot of the distributor 3, it is possible to further reduce the phenomenon of fatigue caused by the periodic repetition of forces exerted on the foot 31 of the dispenser, a phenomenon which can further increase the risk of rupture of a distributor 3 whose foot 31 is pinched by a device according to the prior art with respect to a constant effort. Bearing surface The bearing surface 83 of the mechanical holding plate 8 is typically adapted to receive the non-integrally connected end of the sealing plate 9. The bearing surface 83 of the mechanical holding plate 8 is typically adapted so that the sealing plate 9 bears against it whatever the deformations, caused by temperature variations, of the sealing plate 9 and the mechanical holding plate 8. The bearing surface 83 must allow friction with the sealing plate 9 to limit wear. This friction can be obtained by choosing a pair of compatible materials for the bearing surface 83 and the sealing plate 9, and / or by surface treatment. The addition of the sealing plate 9 does not modify the engine mounting range. The first integral connection means or the second connection means may comprise the bearing surface 83.

For example, the bearing zone 83 may be a surface of the upstream flange 12 of the mechanical holding plate (8). The bearing surface 83 is advantageously arranged so that the sealing plate 9 protects a large part of the mechanical holding plate 8.

Connection secured to the mechanical resistance plate The connection secured to the sealing plate 9 to the mechanical holding plate 8 is advantageously arranged so that the sealing plate 9 protects all its surface a large part of the plate The part of the sealing flange 9 extending between the integral connection at the first edge 91 and the support at the second edge 92 is preferably kept at a distance from the mechanical holding plate 8 This distance makes it possible to form a buffer zone making it possible to limit conduction heat transfer between plates 8 and 9 with respect to a configuration involving direct contact over their entire surface. This distance also makes it possible to limit the frictional stresses that could be applied to the mechanical seal plate 8 by the sealing plate 9 during the deformation of the sealing plate 9 due to temperature changes.

Such frictional stresses could cause wear of the mechanical resistance plate 8. According to an exemplary embodiment illustrated in FIG. 4, the sealing plate 9 can be connected solidly to the mechanical resistance plate 8 by means of a weld.

In particular, the sealing plate 9 can be welded to the mechanical seal plate 8 at a solder shell 93. The solder ring 93 can thus form a recess for welding without risk of damaging the holding plate 8. In addition, the recess forms the buffer zone for limiting heat transfer. Substrate downstream structure General structure The device 1 may further comprise a downstream sheet metal overlap sheet covering, or rear cover plate, also called a disconnecting seal, the downstream cover plate 6 being annular and integral with the flange 111.

The disconnecting seal 6 and typically disposed downstream of the flange 111, for example disposed downstream of the flanges 12 and 13 when the device comprises such flanges, so as to limit heating of a downstream chamber 5 disposed under and downstream of the foot 31 of the dispenser, by a flow of a fluid 72 from a vein located above the downstream chamber 5. Connection integral with the flange The downstream cover plate 6 is typically integrally formed with the flange 111 in a manner similar to the flanges 12 and 13 The connection of the downstream cover plate 6 to the flange 111 can be a direct connection to the flange or via an intermediate portion, and / or via a flange 12 and / or 13.

The integral connection can thus be made by welding or the flange 111 and the downstream cover plate 6 can be made so as to form a single piece. According to one example, the downstream cover plate 6 may comprise at least one fixing orifice 66. Such a fixing orifice 66 may be arranged so that a fastening element 137 can be inserted through, typically a screw-type element. nut, typically a bolt type member, as shown. The fastening element 137 may be adapted to pass through an orifice of the flange 111 and / or of an intermediate connecting element, typically the upstream flange 12 and / or the downstream flange 13. It is understood that such an arrangement can be reproduced several times along the annular structure of the flange so as to ensure better fixation. With reference to FIG. 3, one of the flanges, typically the upstream flange 12, may be connected integrally by welding to the flange 111 along an annular connection zone. The downstream cover plate 6 may be integral with the upstream flange 12 by means of fastening elements 137 passing through aligned orifices of the upstream flange 12 of the downstream cover plate, each having a plurality of holes distributed along the their annular structure.

Claims (10)

REVENDICATIONS1. Connecting device (1) of a fixed turbine engine part (2) and a distributor foot (31) (3) of a turbomachine turbine, comprising an annular flange (111), the flange (111) being adapted to be integrally connected to the fixed part of the turbomachine (2) and to be connected to the foot (31) of the distributor, the device being characterized in that the flange (111) comprises: a mechanical holding plate (8) annular, adapted to form a connection between the fixed part of the turbomachine (2) and the foot (31) of the distributor, the mechanical resistance plate (8) extending between and separating an upstream chamber (4) and a downstream chamber ( 5) respectively disposed upstream and downstream of the foot (31) of the distributor, and an annular sealing plate (9), elastically deformed, adapted to prevent fluid flow between the upstream chamber (4) and the downstream chamber (5) , the sealing plate (9) being arranged upstream of the plate of te mechanical nude (8) and comprising a first edge (91) integrally connected to the mechanical resistance plate (8), and a second edge (92) held in abutment against a bearing surface (83) of the plate mechanical resistance (8) due to the elastic deformation of the sealing plate (9), so as to form a sealing contact between the sealing plate (9) and the bearing surface (83) of the sealing plate mechanical strength (8). 2. Device according to claim 1, wherein the sealed plate (9) is adapted to at least partially block thermal radiation from the fixed part of the turbomachine (2) and directed to the mechanical holding plate (8). 3. Device according to claim 1 or 2, wherein the mechanical resistance plate (8) comprises a first edge (81) adapted to be integrally connected to the fixed part of the turbomachine (2) by first connection means ( 112, 113) secured to the mechanical holding plate (8) and the second edge (82) adapted to be connected to the foot (31) of the distributor by second connection means (12, 13) of the mechanical holding plate (8). ). 4. Device according to claim 3, wherein the first or second connection means (112, 113, 12, 13) comprise the bearing zone. 5. Device according to claim 3 or 4, wherein the second connection means (12, 13) comprise two upstream flanges (12) and annular downstream (13) integral with the mechanical holding plate (8), the two flanges ( 12, 13) being adapted to clamp the foot (31) of the dispenser. 6. Device according to claims 4 and 5, wherein the bearing zone (83) is a surface of the upstream flange (12) of the mechanical seal plate (8). 7. Device according to any one of claims 1 to 6, wherein the mechanical seal plate (8) comprises at least one aperture (84) softening the mechanical seal plate (8). 8. Device according to any one of claims 1 to 7, wherein the first edge (81) of the sealing plate (8) is an inner edge, the second edge (82) being an outer edge disposed downstream of the inner edge. . Turbomachine turbine comprising a device according to one of claims 1 to 8. 10. Turbomachine comprising a device according to one of claims 1 to 8.30.