Peltier cooling system for the environment of a lubricated bearing enclosure wall

Abstract

Peltier Cooling System for the Environment of a Lubricated Bearing Enclosure Wall. The invention relates to a cooling system (2) for the environment of a lubricated bearing enclosure wall (17) of an aircraft turbomachine, comprising: a lubricated bearing enclosure (16), delimited by an outer wall (17); and at least one electrically powered Peltier module (26) comprising a cold plate (30) and a hot plate (31), one of these plates being placed against the outer face (19) of said outer wall. The plate placed against the outer wall is the hot plate when the enclosure is an upstream bearing enclosure (21), and the cold plate when the enclosure is a downstream bearing enclosure. The Peltier module can be electrically powered by a Seebeck-effect thermoelectric generator. Figure to be published with the abstract: Figure 2

Description

Title of the invention: Peltier cooling system for the environment of a lubricated bearing enclosure wall. TECHNICAL FIELD OF THE INVENTION

[0001] The present invention relates to a cooling assembly for the internal or external environment of a lubricated bearing enclosure wall, as well as a turbomachine comprising one or more of these cooling assemblies.

[0002] More specifically, the invention relates to a Peltier effect cooling system for the external environment of an upstream bearing enclosure wall and / or the internal environment of a downstream bearing enclosure wall of a turbomachine.

[0003] The invention finds applications in the field of aircraft turbomachinery, in particular turbojet engines for civil and military aircraft. TECHNOLOGICAL BACKGROUND OF THE INVENTION

[0004] In aircraft turbomachinery, in particular aircraft turbojets, there are several ventilated enclosures around the rotating shafts containing lubricated devices such as bearings and / or reducers, which are classically called "lubricated bearing enclosure" or "bearing enclosure".

[0005] Due to the hot environment in which they are placed (for downstream enclosures, where the oil is the cold source) or the high temperature of the lubricating oil which is injected into these enclosures (for upstream enclosures where the oil is the hot source) and heating due to the operation of the bearings and other lubricated devices they contain, their wall heats up rapidly during the operation of the turbomachine and remains hot for a long time after the turbomachine has stopped.

[0006] This situation tends to worsen in recent turbomachines, due to a general tendency to want to decrease the flow rate and increase the temperature of the oil at the inlet of the bearing housings or to tolerate greater heating inside them, in order to optimize the operation of the lubrication system and the performance of the turbomachine in general, which further increases the resulting temperature of the wall of these housings.

[0007] Depending on the location of the enclosure in the turbomachine, this significant temperature rise of its wall can be problematic for the internal or external environment of this enclosure.

[0008] In the case, for example, of an upstream bearing enclosure, which is the bearing enclosure located furthest upstream of the turbomachine, the problem concerns the external environment of the enclosure.

[0009] Indeed, the upstream bearing enclosure is located directly under the blower, with its outer wall placed opposite and at a short distance from the support of the blower blade feet.

[0010] However, the blade bases of a blower are typically made of resin. While this material offers the advantage of producing blade bases that are lightweight, strong, and of precise, complex shapes, it has the disadvantage of poor resistance to high temperatures. To avoid any risk of deformation and / or deterioration, the temperature of the resin parts must be kept below the glass transition temperature of the resin from which they are made.

[0011] Unfortunately, the enclosure constitutes a heat source for the fan blade root area, and the temperature of its outer wall can approach the glass transition temperature of the blade root resin. Since there is only a weak flow of hot air circulating between the hot wall of the enclosure and the fan blade root support, with a flow rate too low and a temperature too high to effectively dissipate the heat from the enclosure, the hot wall of the enclosure, located near and opposite the fan blade root support, is responsible for a significant and problematic temperature increase at the fan blade roots, both by radiation and convection.

[0012] The high temperature of the external wall of the upstream enclosure is therefore a problem for its external environment.

[0013] In the case of a downstream bearing enclosure, which is the bearing enclosure located furthest downstream of the turbomachine, the problem concerns the internal environment of the enclosure.

[0014] Indeed, the downstream bearing housing is located in a much hotter area of ​​the turbomachine because it is situated downstream of the combustion chamber. Its external wall is therefore strongly heated by the hot external environment in which it is located.

[0015] When the lubricating oil comes into contact with this very hot wall, it can degrade through a coking process. In addition to altering the physicochemical properties of the oil, thus reducing its performance, this coking process leads to the formation of solid deposits, which can clog the oil circuit's passages or filters and thus have serious consequences for the operation of the turbomachine.

[0016] Here again, the high temperature of the outer wall of the enclosure is a problem, but this time for its internal environment.

[0017] There is therefore a need for a cooling device, which is simple, efficient and versatile, which would allow either the external environment or the internal environment of a lubricated bearing enclosure wall to be cooled. Summary of the invention

[0018] The invention aims to solve this technical problem.

[0019] For this purpose, a first aspect of the invention teaches an assembly for cooling the environment of a lubricated bearing enclosure wall of an X-axis aircraft turbomachine.

[0020] This cooling assembly includes: • a lubricated bearing enclosure, delimited by an external wall having an outer face and an inner face, and • at least one Peltier thermoelectric module (also called a "Peltier module"), electrically powered and comprising two plates, one of which is a cold plate and the other a hot plate,

[0021] In addition, one of said plates is placed against the outer face of said outer wall.

[0022] Thanks to the assembly according to the invention, cooling of the environment of the wall of the lubricated bearing housing on which it is mounted is very simple. This is achieved by electrically supplying the Peltier module of the assembly so that a heat flow is created between its plates.

[0023] This assembly is advantageously versatile, because it is sufficient to reverse the direction of the electric current supplying the Peltier module, so that the direction of the heat flow created is reversed.

[0024] Thus, by simply adjusting the direction of the current, it is possible to choose whether the plate placed against the outer face of the outer wall of the enclosure is the hot plate or the cold plate and consequently whether cooling of the external or internal environment of the enclosure is obtained.

[0025] Furthermore, the use of a Peltier module to cool the internal or external environment of a lubricated bearing enclosure has many advantages.

[0026] First of all, it is compatible with the temperature differentials of the area concerned and the thermal powers to be evacuated.

[0027] Furthermore, since the operation of the cooling system according to the invention is based on the action of one or more Peltier modules, it is not necessary to use a heat transfer fluid to achieve cooling. The installation of a heat transfer fluid circulation circuit in the turbomachine is thus avoided, saving space and, above all, weight, and reducing the risk of leaks and failures. In addition, it is not necessary to draw air from a duct in the turbomachine to achieve this cooling, which limits the overall performance degradation caused by such extractions.

[0028] On the other hand, the Peltier module has a small footprint and no moving parts. It is also insensitive to vibrations.

[0029] All these characteristics of the Peltier module make the cooling assembly according to the invention particularly advantageous.

[0030] Advantageously, said lubricated bearing enclosure may be an upstream bearing enclosure. In this case, the plate that is placed against the outer face of the external wall is the hot plate.

[0031] With such a setting of the direction of the supply current, advantageously cooling of the external environment of the upstream enclosure is obtained which protects the blade feet of the opposite blower.

[0032] Indeed, the cold plate of the Peltier module is then directed towards the outside of the enclosure. It advantageously creates a cold screen which is interposed between the hot wall of the upstream bearing enclosure and the support in which the blade feet are mounted and which thermally insulates the support from the opposite heat source.

[0033] The cooling assembly thus makes it possible to guarantee an acceptable temperature for the support and the blade feet it contains, which remains well below the glass transition temperature of the resin, despite the proximity of the hot wall of the front bearing housing.

[0034] Advantageously, the cold plate of the Peltier module can then include fins. These fins increase the surface area of ​​the cold plate and improve the cooling heat exchange between the cold plate and the air present in the external environment of the enclosure.

[0035] Advantageously, said lubricated bearing enclosure may be a downstream bearing enclosure. In this case, the plate that is placed against the outer face of the external wall is the cold plate.

[0036] With such a setting of the direction of the supply current, advantageous cooling of the internal environment of the downstream enclosure is obtained which limits the phenomenon of oil coking.

[0037] Indeed, the cold plate of the Peltier module is then placed against the outer wall of the enclosure, which causes it to cool down. This reduces the temperature of the wall in contact with the oil, thus decreasing the risk of coking.

[0038] The cooling system thus makes it possible to guarantee an acceptable temperature at the level of the inner face of the outer wall of the enclosure, which limits the problems of coking of the lubricating oil inside the enclosure.

[0039] Advantageously, the cooling assembly can include several Peltier modules, one of whose plates is placed against the outer face of the external wall, these plates being arranged in an annular ring with axis X around the external wall.

[0040] The total cooling surface, corresponding to the surface of all the cold plates of the Peltier modules, is thus increased and can cover a larger portion of the external wall of the enclosure, which allows for better cooling of its internal or external environment.

[0041] Furthermore, when these plates are arranged circumferentially in an annular ring with axis X around the outer wall, they can, for example, be arranged so as to cover at 360° the portion of the outer wall corresponding to the location of a bearing which often constitutes the hottest place in the enclosure or the most sensitive to coking.

[0042] Advantageously, the cooling assembly may further include a Seebeck effect thermoelectric generator, comprising at least one Seebeck effect thermoelectric module (called a "Seebeck module"), which electrically supplies the Peltier module(s).

[0043] The Seebeck module(s) of the Seebeck effect thermo-electricity generator produce electricity when a temperature difference exists between their two plates. The electricity produced is sent to the Peltier module(s), which are then electrically powered and can produce a heat flux. It is therefore unnecessary to add a dedicated electric generator or to use part of the electricity produced by an electric generator already present in the turbomachine or aircraft for another function.

[0044] Advantageously, such a Seebeck effect thermo-electricity generating device has a small footprint, has no moving parts and is insensitive to vibrations.

[0045] A second aspect of the invention relates to a turbomachine comprising a cooling assembly as described above.

[0046] Advantageously, this turbomachine may include a cooling assembly in which said lubricated bearing enclosure is an upstream bearing enclosure and in which the plate which is placed against the outer face of the external wall is the hot plate, and a cooling assembly in which said lubricated bearing enclosure is a downstream bearing enclosure and in which the plate which is placed against the outer face of the external wall is the cold plate.

[0047] Thus, two identical cooling assemblies, but simply set differently, can be used at two different locations of the turbomachine, to equip two lubricated bearing enclosures subjected to different stresses, in order to cool in one case the external environment and in the other case the internal environment of the wall of the lubricated bearing enclosure concerned.

[0048] In this case, the turbomachine may further comprise a Seebeck-effect thermogenerating device for electricity, comprising at least one module Seebeck, which electrically powers the Peltier modules of the two cooling assemblies.

[0049] A unique Seebeck effect thermo-electricity generator device, which has all the advantages already listed above, can thus simultaneously power the two cooling sets, allowing for a saving of space and weight in the turbomachine.

[0050] Advantageously, when the turbomachine is a dual-flow turbomachine comprising an inter-flow compartment located between a primary airflow and a secondary airflow, and when the turbomachine further comprises a Seebeck effect thermal electricity generator, comprising at least one Seebeck module, which electrically supplies the Peltier module(s), this Seebeck effect thermal electricity generator can be disposed in the inter-flow compartment, with a plate of the Seebeck module(s) placed against a wall separating the inter-flow compartment from the secondary airflow.

[0051] The inter-vein compartment is sufficiently spacious to house the Seebeck effect thermo-electricity generator. Furthermore, when a plate of the Seebeck module(s) is placed against the casing wall separating the inter-vein compartment from the secondary airflow, there is a suitable and sufficient temperature differential, which does not reverse during the different phases of flight, to continuously produce electricity between its two plates, with one plate subjected to the temperature of this wall, which is cooled by the airflow circulating in the secondary airflow on the other side of the wall, and another plate subjected to the relatively warm temperature prevailing in the inter-vein compartment.

[0052] The invention and its various applications will be better understood by reading the following description and examining the accompanying figures. BRIEF DESCRIPTION OF THE FIGURES

[0053] The figures are presented for illustrative purposes only and are in no way limiting of the invention.

[0054] [Fig.1] is a schematic cross-sectional view of an example of a cooling assembly according to the invention equipping an upstream bearing enclosure.

[0055] [Fig.2] is an enlargement of the framed area of ​​[Fig.1].

[0056] [Fig.3] is a similar view to [Fig.2] for another variant of the invention.

[0057] [Fig.4] is a schematic cross-sectional view of another example of an assembly of cooling according to the invention equipping a downstream bearing enclosure.

[0058] [Fig.5] and [Fig.6] are overall schematic cross-sectional views of one half of turbomachine comprising two cooling units, one at the upstream bearing housing and the other at the downstream bearing housing, which are powered by a Seebeck effect thermo-generator of electricity on [Fig.5] and by a conventional electric generator on [Fig.6]. DETAILED DESCRIPTION

[0059] Unless otherwise specified, the same element appearing on different figures has a unique reference.

[0060] In the present application, the terms "upstream" or "front" and "downstream" or "rear" are defined with respect to the normal direction of gas flow (from upstream / front to downstream / rear) through a turbomachine.

[0061] The "turbomachine axis" is the longitudinal axis of the turbomachine corresponding to the axis of rotation of the turbomachine's rotor. A radial direction is a direction perpendicular to the turbomachine axis and intersecting this axis.

[0062] Unless otherwise specified, the adjectives "internal" or "interior" and "external" or "exterior" are used with reference to a radial direction, so that the internal or inner part of an element is, along a radial direction, closer to the axis of the turbomachine than the external or outer part of the same element.

[0063] The term "bearing enclosure" refers to a pressurized chamber in which one or more lubricated bearings are housed. The terms "upstream or forward bearing enclosure" and "upstream or forward enclosure" are synonymous and refer to the bearing enclosure located furthest upstream of the turbomachine. Similarly, the terms "downstream or aft bearing enclosure" and "downstream or aft enclosure" are synonymous and refer to the bearing enclosure located furthest downstream of the turbomachine.

[0064] Figure 1 and the enlargements of Figures 2 and 3 schematically represent a forward portion of a turbomachine 1 in which an example of a cooling assembly 2 according to the invention has been installed. The turbomachine 1 shown includes a reduction gear to decrease the rotational speed of the fan relative to that of the low-pressure shaft, but it is understood that the invention also applies to a turbomachine without a reduction gear.

[0065] In this front portion of turbomachine 1 there is conventionally a shaft 3 on which is mounted a ring of movable blades 4 called a fan 5. Each of these blades 4 has a body 6 (also called a blade) and a foot 7 and extends radially from a support 8 of blade feet mounted on the shaft 3 and in which the feet 7 of the blades 4 are engaged.

[0066] The blade feet support 8 shown is an annular support comprising a hub 9 fixed to the shaft 3, a disc-shaped flange 10 and a rim 11 on which the feet 7 of the blades 4 are fixed.

[0067] The shaft 3, the blade foot support 8 and the blower 5 form an assembly which is mobile in rotation around an axis X corresponding to the longitudinal axis of the turbomachine 1.

[0068] For this purpose, the shaft 3 is assembled to the fixed housing 12 of the turbomachine 1 by means of bearings 13, such as the ball bearing 14 and the cylindrical roller bearing 15 located in the front portion shown. These bearings 13, which are lubricated devices, are arranged in ventilated enclosures 16, the pressure of which is maintained below that of the external environment to prevent oil leaks, which are delimited by external walls 17 and by the shaft 3, and which are closed by seals 18, preferably of the labyrinth type.

[0069] The outer wall 17 of these enclosures 16 has an outer face 19 and an inner face 20.

[0070] The housing 16 containing the ball bearing 14 and the cylindrical roller bearing 15 shown in [Fig. 1] is the upstream bearing housing 21. This housing 21 is annular and extends all around the shaft 3, with the X-axis as its axis of rotational symmetry. As can be seen in Figures 1 to 3, it includes a portion 22 of an outer wall 17, located opposite the blade root support 8. More precisely, this portion 22 is located just below the downstream part of the rim 11, opposite and a short distance from it.

[0071] Between the blade foot support 8 and the portion 22 of the outer wall of the upstream bearing housing 21 is a hollow annular volume 23 which extends both upstream and downstream. This hollow annular volume 23, whose axis X constitutes the axis of symmetry of revolution, is bounded by the outer wall 17 of the upstream bearing housing 21, the shaft 3, the blade foot support 8, a wall 24 of the fixed housing 12 and a sealing ferrule 25.

[0072] Due to the high temperature of the lubricating oil in the upstream bearing housing 21 and the heating of the cylindrical roller bearing 15 directly below it, the portion 22 of the outer wall 17 heats up rapidly when the turbomachine 1 is operating. As it is located below and in the immediate vicinity of the blade foot support 8, its heat is transferred to the support 8 and to the resin blade feet 7 it contains.

[0073] To avoid this, a cooling assembly 2, comprising at least one Peltier module 26, is provided to equip the upstream bearing enclosure 21.

[0074] In a conventional manner, and as can be seen in the enlargements of Figures 2 and 3, this Peltier module 26 comprises two ceramic plates 27 between which is arranged a series of alternating polarity semiconductor elements 28, connected to each other by a conductor 29. When an electric current flows through the conductor 29, a heat flux is generated by the semiconductor elements 28 between the two plates. 27, one of which, called the cold plate 30, becomes colder, and the other, called the hot plate 31, becomes hotter.

[0075] According to the invention, one of the plates 27 of the Peltier module 26 is placed against the outer face 19 of the outer wall 17 of the enclosure 16. As in the example of figures 1 to 3, the enclosure 16 is an upstream bearing enclosure 21, it is the hot plate 31 which is in contact with the outer wall 17.

[0076] The cold plate 30 of the Peltier module 26 is thus directed towards the hollow annular volume 23 and is located opposite the blade support 8. When the Peltier module 26 is powered, it forms a cold screen interposed between the hot outer wall 17 of the upstream enclosure 21 and the blade support 8. This cold screen thermally insulates the support 8 from the heat source constituted by the outer wall 17 and lowers the overall temperature of the hollow annular volume 23 at this level, as well as that of the blade support 8.

[0077] An acceptable temperature for the support 8 and the blade feet 7 it contains is thus guaranteed, which remains largely below the glass transition temperature of the resin, despite the proximity of the hot outer wall 17 of the upstream bearing enclosure 21.

[0078] To produce the desired heat flux, this Peltier module 26 is electrically powered, via the electrical wires 32, for example by means of an electrical generator 33 as shown in [Fig.6].

[0079] This electric generator 33 can be a specific generator dedicated to this use, or preferably a generator which fulfills another function in the turbomachine, for example the small generator / alternator which supplies the electrical elements of the turbomachine (the central computer for example), or more preferably a large generator which covers part of the electrical needs of the aircraft.

[0080] Alternatively, the Peltier module 26 can advantageously be electrically powered by a Seebeck effect thermo-electricity generator device 34 as shown in [Fig.5].

[0081] This Seebeck effect thermo-electricity generator device 34 comprises at least one Seebeck module 35 which has a structure identical to the Peltier module 26 described previously, i.e. it also comprises two ceramic plates 27 between which are arranged semiconductor elements 28 connected to each other by a conductor 29. However, it operates in the opposite direction.

[0082] Indeed, such a Seebeck module 35 generates electricity in the conductor 29 when a temperature differential exists between its two plates 27. This electricity is sent via the electrical wires 32 to the Peltier module(s) 26 which are then electrically powered.

[0083] Since the efficiency of a Seebeck module 35 is relatively low, the Seebeck effect thermogenerator device 34 preferentially includes several of them to produce more electricity.

[0084] Similarly, the cooling assembly 2 can include several Peltier modules 26 in order to increase the total cooling surface, corresponding to the surface of all their cold plates 30, and to cover more completely the hottest parts of the outer wall 17 of the enclosure in order to better shield them.

[0085] These Peltier 26 or Seebeck 34 modules can be electrically connected in series, but are preferably connected in parallel in order to avoid a possible failure of one of them.

[0086] These Peltier modules 26 can advantageously be distributed circumferentially around the enclosure 21, for example at the level of the cylindrical roller bearing 15, thus forming an annular ring with axis X.

[0087] According to a variant shown in [Fig. 3], the Peltier module(s) 26 may further comprise fins 36, which extend from the cold plate 30 and into the hollow annular volume 23, in order to improve heat exchange between the cold plate 30 and the air present in the hollow annular volume 23, and thus improve its cooling. These fins 36 are, for example, substantially perpendicular to the cold plate 30.

[0088] In [Fig.4], another example of a cooling assembly 2 according to the invention is schematically represented, this time installed at the level of the downstream bearing enclosure 37 in the rear part of the turbomachine 1.

[0089] In this rear part of the turbomachine 1 there is conventionally a shaft 3 on which the movable blades of the compressors are mounted, the whole being movable in rotation around the axis X of the turbomachine 1.

[0090] For this purpose, the shaft 3 is assembled to the fixed housing of the turbomachine 1 by means of bearings 13, such as the cylindrical roller bearings 38 and 39 shown. These bearings 38 and 39 are arranged in a ventilated enclosure 16, called the downstream bearing enclosure 37, which is delimited by an external wall 17, having an outer face 19 and an inner face 20.

[0091] Due to the very high temperature of the external environment in which this downstream enclosure 37 is located, its outer wall 17 heats up considerably and there are risks of coking of the lubricating oil inside the enclosure, when it is projected and flows against the inner face 20 of the wall 17.

[0092] To avoid this, a cooling assembly 2 is fitted to this downstream bearing enclosure 37.

[0093] In the example shown in [Fig. 4], this cooling assembly 2 comprises several Peltier modules 26, connected in series, one of whose plates 27 is placed against the outer face 19 of a portion 40 of the outer wall 17 located above the bearing 39.

[0094] As this is the downstream bearing enclosure 37, it is the cold plate 30 which is in contact with the portion 40 of the external wall 17. This cold plate 30 thus cools the external wall 17 of the enclosure with which it is in contact and the risks of coking on the inner face 20 are greatly reduced.

[0095] To produce the desired heat flux, these Peltier modules 26 are electrically powered, via the electrical wires 32, by means of an electrical generator 33 or a Seebeck effect thermo-electricity generator device 34 as described with reference to the previous example.

[0096] Figures 5 and 6 show an example of a turbomachine 1 comprising two cooling assemblies 2, one located at the upstream bearing housing 21 and the other at the downstream bearing housing 37.

[0097] Advantageously, the Peltier modules 26 of these two cooling sets 2 can be electrically powered, via electrical wires 32, by a single common generator, which can be a conventional electrical generator 33 as in the example of [Fig.6] or a Seebeck effect thermo-electricity generator device 34 as in the example of [Fig.5].

[0098] In the case as shown in these figures of a twin-body, twin-flow turbomachine 1, this electric generator 33 or Seebeck effect thermo-electricity generator device 34 can advantageously be housed in the inter-flow compartment 41 located between the primary air flow 42 and the secondary air flow 43 of the turbomachine.

[0099] As shown in [Fig.5], in the case of a Seebeck effect thermo-electricity generating device 34, one of the plates 27 of the Seebeck module(s) 35 can be placed against the wall 44 of the housing separating the inter-vein compartment 41 from the secondary vein 43, to benefit from a suitable temperature differential with the second plate 27 of the Seebeck module 35 which is located in the inter-vein compartment 41.

[0100] If the Seebeck effect thermo-electricity generator device 34 comprises several Seebeck modules 35, these can advantageously be distributed circumferentially against the wall 44, thus forming an annular ring with axis X.

Claims

Demands

1. Cooling assembly (2) for the environment of a wall (17) of a lubricated bearing enclosure (16) of an X-axis aircraft turbomachine (1), characterized in that it comprises: - a lubricated bearing enclosure (16), delimited by an external wall (17) having an outer face (19) and an inner face (20), and - at least one Peltier module (26), electrically powered and comprising two plates (27) of which one is a cold plate (30) and the other is a hot plate (31), - and in that one of said plates (27) is placed against the outer face (19) of said external wall (17).

2. Cooling assembly (2) according to claim 1 characterized in that said lubricated bearing enclosure (16) is an upstream bearing enclosure (21), and in that the plate (27) which is placed against the outer face (19) of the outer wall (17, 22) is the hot plate (31).

3. Cooling assembly (2) according to claim 2 characterized in that the cold plate (30) comprises fins (36).

4. Cooling assembly (2) according to claim 1 characterized in that said lubricated bearing enclosure (16) is a downstream bearing enclosure (37), and in that the plate (27) which is placed against the outer face (19) of the outer wall (17, 40) is the cold plate (30).

5. Cooling assembly (2) according to any one of the preceding claims characterized in that it comprises several Peltier modules (26) one of whose plates (27) is placed against the outer face (19) of the outer wall (17) and in that these plates (27) are arranged in an annular ring with axis X around the outer wall (17).

6. Cooling assembly (2) according to any one of the preceding claims characterized in that it further comprises a Seebeck effect thermo-electricity generating device (34), comprising at least one Seebeck module (35), which electrically supplies the Peltier module(s) (26).

7. Turbomachine (1) comprising a cooling assembly (2) according to any one of the preceding claims.

8. Turbomachine (1) according to claim 7 characterized in that it comprises a cooling assembly (2) according to claim 2 and a cooling assembly (2) according to claim 4.

9. Turbomachine (1) according to claim 8 when dependent on claim 6, characterized in that said Seebeck effect thermo-electricity generating device (34) electrically supplies the two cooling assemblies (2).

10. Turbomachine (1) according to any one of claims 7 to 9 when dependent on claim 6, which is a dual-flow turbomachine comprising an inter-flow compartment (41) situated between a primary air flow (42) and a secondary air flow (43), characterized in that the Seebeck effect thermo-electricity generator device (34) is disposed in the inter-flow compartment (41), and in that the Seebeck module(s) (35) comprises a plate (27) placed against a wall (44) separating the inter-flow compartment (41) from the secondary air flow (43).