FR3045718A1 - DEVICE FOR THE SEALED CROSSING OF A TURBOMACHINE FENCE - Google Patents

Abstract

The invention relates to a traversing device (100) for the sealed passage of an instrumentation cable (51, 52) between two compartments of a turbomachine separated by a partition (200) having an opening (210) characterized in that it comprises: a first cup (10), said internal cup, intended to be secured within said partition (200), having an annular base (11) and an outgrowth (12) protruding from at said annular base (11) and having a through recess (15) suitable for the passage of said instrumentation cable (51, 52); said protrusion (12) having a geometry adapted to traverse said opening (210) of said partition (200); a second cup (20), said external cup, intended to be secured outside said partition (200), having a boss (22) covering said protrusion (12) of said first cup (10), said second cup ( 20) having an orifice (24, 23) for the output of said instrumentation cable.

Description

DEVICE FOR THE SEALED CROSSING OF A ROOF

TURBOMACHINE

TECHNICAL FIELD OF THE INVENTION

The field of the invention relates to development turbomachines on which a large number of instrumentations is necessary to characterize and validate certain technical choices for the development of so-called series turbomachines.

The invention relates more particularly to a sealed through device for the passage of instrumentation cables between two compartments of a turbomachine separated by a partition, such as a turbine casing.

STATE OF THE PRIOR ART

On turbomachines in the development phase, we seek to obtain the maximum of information relating to the operation of the turbomachine. Thus, the test turbomachines have a large number of instrumentations inside the various elements of a turbomachine that it is necessary to wire and connect to analysis means positioned outside the turbomachine.

For example, at the stator of the low-pressure turbine assembly of the turbomachine, it is desirable to instrument each stage of the low-pressure turbine so as to obtain a feedback on the whole. of the low pressure turbine. For this, it is necessary to provide a passageway for guiding the instrumentation cables from the inside to the outside of the turbomachine, in particular passing through the low pressure turbine casing.

However, given the environment on either side of the low pressure turbine casing, it is not always possible to instrument each stage of the turbine because the residual space does not allow the assembly watertight crossing devices generally used.

In addition, for sensitive parts imperatively requiring instrumentation, it is sometimes necessary to impose an architectural modification of the turbomachine for mounting a sealed through device and thus allow the instrumentation of the turbomachine. However, this configuration amounts to characterizing a turbomachine with architectural arrangements that will not be reproduced on the series turbomachine, which poses problems of representativeness and validation.

In addition, given the large dimensions of the traversing devices, it is sometimes difficult to obtain a good seal crossing especially when the device is mounted on a curved wall as the turbomachine casings.

SUMMARY OF THE INVENTION

In this context, the invention aims to remedy all or part of the disadvantages of the state of the art identified above, and in particular to provide a sealed passage device for the passage of instrumentation cables having a small space so as to position it on each of the stages of a turbomachine low pressure turbine, to overcome modifications or retouching of certain turbomachine elements necessary for the implementation of a traversing device and improving sealing of such a crossing.

To this end, the invention relates to a traversing device for the sealed passage of an instrumentation cable between two compartments of a turbomachine separated by a partition having an opening characterized in that it comprises: - a first cup, said inner cup, intended to be secured within said partition, having an annular base and protrusion protruding from said annular base and having a recess opening adapted to the passage of said instrumentation cable; said protrusion having a geometry adapted to traverse said opening of said partition; a second cup, called said external cup, intended to be secured to the outside of said partition, having a boss covering said protrusion of said first cup, said second cup comprising an orifice for the output of said instrumentation cable.

In addition to the main features which have just been mentioned in the preceding paragraph, the sealed penetration device according to the invention may have one or more additional characteristics among the following, considered individually or according to the technically possible combinations: - said cup internal comprises a lumen formed on the periphery of said protrusion and in that said outer cup has a lumen formed on the periphery of said boss forming said orifice for the output of said instrumentation cable, the two lights cooperating so as to form a tangential output for the passage of said instrumentation cable; said tangential exit for the passage of said instrumentation cable has a passage section modifiable by relative rotation of the two cups; said orifice of said outer cup is an opening formed on the upper part of the boss forming a radial outlet for the passage of said instrumentation cable; said device comprises a shutter having an opening for the passage of said instrumentation cable and filling the recess emerging from the inner cup; the inner cup has an internal shoulder arranged inside said protuberance of said inner cup forming a bearing surface for positioning said shutter; said device comprises sealing means; - The sealing means are formed by a sealing cement filling the internal space of said device.

The invention also relates to a passage device for the sealed passage of a first instrumentation cable and a second instrumentation cable between two compartments of a turbomachine separated by a partition (200) having an opening characterized in that it comprises: - a first cup, said inner cup, intended to be secured within said partition, having an annular base and an outgrow projecting from said annular base and having a recess opening adapted to the passage of said instrumentation cable; said protrusion having a geometry adapted to traverse said opening of said partition and having; said inner cup having a lumen formed on the periphery of said protrusion; a second cup, called said external cup, intended to be secured to the outside of said partition, having a boss covering said protrusion of said first cup, said external cup comprising: a light formed on the periphery of said boss, the two lights cooperating to form a tangential outlet for the passage of said first instrumentation cable; - An opening on the upper part of the boss forming a radial outlet for the passage of said second instrumentation cable.

In addition, the device comprises sealing means adapted to achieve a seal at said light formed on the periphery of said boss and at said opening formed on the upper part of the boss.

BRIEF DESCRIPTION OF THE FIGURES

Other features and advantages of the invention will emerge on reading the description which follows, with reference to the appended figures, which illustrate: FIG. 1 illustrates a perspective view of an exploded view of a traversing device waterproof according to the invention positioned on either side of a turbomachine casing; Figure 2 illustrates a sectional view of an exploded leakage device illustrated in Figure 1; FIG. 3 illustrates a perspective view of a sealed feedthrough device according to the invention in position on a turbomachine casing; FIG. 4 illustrates a sectional view of the leak-proof device illustrated in FIG. 3.

For clarity, identical or similar elements are identified by identical reference signs throughout the figures.

DETAILED DESCRIPTION OF AN EMBODIMENT

Figure 1 is a perspective view of an exploded of the various elements constituting the sealing device 100 according to the invention. FIG. 2 is a cross-sectional representation of an exploded section of the leak-proof device illustrated in FIG.

Figure 3 illustrates in perspective the sealed through device according to the invention in position on the turbomachine casing. Figure 4 shows a sectional view of this sealing device mounted on the crankcase.

With reference to FIGS. 1 to 4, the leaktight penetration device 100 according to the invention allows the sealed passage of instrumentation cables 51, 52 between two compartments of a turbomachine separated by a casing 200 having an opening 210 for the passage of instrumentation cables. In the embodiment illustrated in Figures 1 to 4, the housing 200 is a low pressure turbine casing.

The leaktight penetration device 100 according to the invention comprises: a first cup 10, called inner cup, intended to be secured to the inside of the housing 200, the inner cup 10 having a through hole 15 allowing the passage of at least one instrumentation cable 51,52; a second cup 20, said external cup, intended to be secured to the outside of the housing 200; an internal shutter 30 for closing at least partially the opening hole 15 of the inner cup 10, while allowing the passage of at least one instrumentation cable 51, 52.

The inner cup 10 is formed by an annular base 11 and an outgrowth 12, for example of cylindrical shape, projecting from the annular base 11. The protrusion 12 advantageously has a shape complementary to the opening 210 arranged in the casing 200 for the passage of the instrumentation cables 51, 52. In the exemplary embodiment, the opening 210 formed in the casing 200 is a circular opening.

The annular base 11 of the inner cup 10 forms a bearing surface for the positioning of the inner cup 10 on the inner face of the housing 200. The securing of the inner cup 10 on the housing 200 is made in a sealed manner by example by electric welding points.

In addition, the protrusion 12 has on its side at least one notch forming a hole 13 for the passage of at least one instrumentation cable 52.

The inner cup 10 also comprises holding means 14 for holding in position the inner shutter 30. By way of example the holding means are formed by an annular shoulder formed inside the protrusion 12 thus forming a bearing surface for the internal shutter 30.

The inner shutter 30 has an opening, for example U-shaped, whose dimensions are adjusted according to the number of instrumentation cables 51, 52 that it is necessary to pass. Thus, the internal shutter 30 allows the passage of the instrumentation cables 51,52 while closing a portion of the hole 15 of the inner cup 10.

The outer cup 20 is formed by an annular base 21 and a boss 22 projecting from said annular base 21. The annular base 21 forms a bearing surface for the positioning of the outer cup 20 on the face 200 of the outer casing. In the same way as the inner cup 10, the fastening of the outer cup 20 on the housing is made in a sealed manner for example by electric welding point.

The boss 22 is adapted to cover the opening 210 of the housing 200 and the protrusion 12 of the inner cup 10 thus forming a "cap" at the opening of the housing 200. The boss 22 has on its at least one side 23 allowing the passage of at least one instrumentation cable 52.

The two slots 13, 23 arranged on the sides of the two cups make it possible to achieve a tangential output of the instrumentation cables 52 with respect to the casing 200 as illustrated in FIG. 2.

Depending on the relative positioning of the two cups 10, 20, it is possible to adjust, by relative rotation thereof, the passage section of the tangential outlet by making more or less coincide the lights 13, 23 between they. Thus, it is possible to configure the passage section of the tangential output as a function of the number of instrumentation cables 52 to be passed. It is also possible to completely close this tangential outlet by pivoting one of the two cups by 180 ° so that the lights 13, 23 are in opposition.

In a complementary manner, the boss 22 may also have in the upper part an opening 24 formed at the upper surface of the boss 22 so as to allow the passage of at least one instrumentation cable 51, and thus forming a radial output of the traversing device.

Thus, the traversing device 100 according to the invention allows to have a first instrumentation cable output, called "tangential" and a second instrumentation cable output in a radial direction, called " radial outlet ", for the passage of different instrumentation cables 51, 52, which may have for example different diameters. Thus, the leaktight penetration device 100 according to the invention is a versatile device that can be used in different turbine engine architecture. Indeed, according to the uses and needs, it is possible to seal, for example by means of sealing cement, an outlet that would not be used in a particular application.

The sealed through device 100 according to the invention is an easily achievable device, usable in many applications and inexpensive to manufacture, especially by its simple geometric shapes.

For example, the cups 10, 20 have a thickness of less than 1 mm and advantageously of the order of 0.2 mm at the annular base 11, 21.

The traversing device 100 according to the invention makes it possible to perform instrumentation also in an inaccessible environment, the external dimensions of such a traversing device being small, for example of the order of 12 mm in diameter and 7 mm high for the passage of a capacitive cable 2.5 mm in diameter and a plurality of cables 1 mm in diameter.

The reduced size of the traversing device 100 according to the invention thus eliminates the architectural modification of test turbomachines such as for example deviation of cooling ramps at the stator of a low pressure turbine.

The small dimensions of the traversing device 100 also improve the sealing thereof, by improving the contact between the small cups and in particular when the traversing device is positioned on a turbomachine casing having a curved surface. Indeed, the contact surface between the traversing device and the casing 200 is all the more so as the dimensions of the device are reduced, which contributes to improving the sealing of the passage 200 of the casing. Geometry the traversing device 100 also ensures a pressure resistance in the case of use in a turbomachine low pressure turbine.

The upper opening 24 of the outer cup 20 advantageously allows the output of an instrumentation cable 51 having a diameter greater than 2 mm, the minimum radius of curvature of the cable would not allow to achieve a tangential output by the tangential exit of the traversing device 100.

Conventionally, the sealing of the traversing device is completed by the application of a sealing cement to fill the various asperities of the device and to make a seal around the instrumentation cables at the level of Outputs of the outer cup 20. The invention is not limited to the embodiments previously described with reference to the figures and variants could be envisaged without departing from the scope of the invention.

Claims (10)

1. Device for passing through (100) for the sealed passage of an instrumentation cable (51, 52) between two compartments of a turbomachine separated by a partition (200) having an opening (210) characterized in that it comprises: - a first cup (10), said inner cup, intended to be secured within said partition (200), having an annular base (11) and an outgrowth (12) projecting from said annular base (11) and having a through recess (15) suitable for the passage of said instrumentation cable (51, 52); said protrusion (12) having a geometry adapted to traverse said opening (210) of said partition (200); a second cup (20), called an outer cup, intended to be secured to the outside of said partition (200), having a boss (22) covering said protrusion (12) of said first cup (10), said second cup (20) having an orifice (24, 23) for the output of said instrumentation cable. 2. Device traversing (100) according to claim 1 characterized in that said inner cup (10) comprises a slot (13) formed on the periphery of said protrusion (12) and in that said outer cup (20) comprises a light (23) formed on the periphery of said boss (22) forming said orifice for the output of said instrumentation cable, the two lumens (13, 23) cooperating to form a tangential outlet for the passage of said instrumentation cable ( 52). 3. traversing device (100) according to claim 2 characterized in that said tangential outlet for the passage of said instrumentation cable (52) has a passage section modifiable by relative rotation of the two cups (10, 20). 4. traversing device (100) according to claim 1 characterized in that said orifice of said outer cup (20) is an opening (24) formed on the upper portion of the boss (22) forming a radial outlet for the passage of said cable instrumentation. 5. traversing device (100) according to one of claims 1 to 4 characterized in that said device comprises a shutter (30) having an opening for the passage of said instrumentation cable and filling the opening opening (15) of the inner cup. 6. traversing device (100) according to claim 5 characterized in that the inner cup (10) has an inner shoulder (24) arranged inside said projection (22) of said inner cup (10) forming a surface support for positioning said shutter (30). 7. traversing device (100) according to one of claims 1 to 6 characterized in that said device comprises sealing means. 8. Device traversing (100) according to claim 7 characterized in that the sealing means are formed by a sealing cement filling the internal space of said device (100). 9. A passage device (100) for the sealed passage of a first instrumentation cable (52) and a second instrumentation cable (51) between two compartments of a turbomachine separated by a partition (200) having an opening (210) characterized in that it comprises: - a first cup (10), said internal cup, intended to be secured inside said partition (200), having an annular base (11) and an outgrowth ( 12) protruding from said annular base (11) and having a through recess (15) adapted for passage of said instrumentation cable (51, 52); said protrusion (12) having a geometry adapted to traverse said opening (210) of said partition (200) and having; said inner cup (10) having a lumen (13) formed on the periphery of said protrusion (12); a second cup (20), referred to as an outer cup, intended to be secured to the outside of said partition (200), having a boss (22) covering said protrusion (12) of said first cup (10), said external cup (20) comprising: - a lumen (23) formed on the periphery of said boss (22), the two lumens (13, 23) cooperating to form a tangential outlet for the passage of said first instrumentation cable (52); - An opening (24) formed on the upper part of the boss (22) forming a radial outlet for the passage of said second instrumentation cable (51). 10. Device for passage (100) for the sealed passage of a first instrumentation cable (52) and a second instrumentation cable (51) between two compartments of a turbomachine according to claim 9 characterized in that said device (100) comprises sealing means capable of sealing at said light (23) formed on the periphery of said boss (22) and at said opening (24) formed on the upper part of the boss ( 22)