BE1027813B1 - LUBRICATION GROUP MODULAR CASING - Google Patents

Abstract

The present invention relates to a modular casing for an aircraft turbomachine lubrication unit comprising three casing elements. The pump housing (10) comprises a first tube (11) intended to receive pumps and to serve as a male part around which the filter housing (20) and the recovery housing (30) are arranged. The filter housing (20) accommodates an outlet filter. The recovery casing (30) includes the inlets (35) of the casing.

Description

Modular lubricating unit housing Technical area

The present invention relates to a housing for a lubrication unit for an aircraft turbomachine. Prior art

[0002] Document BE2017 / 5656 describes a lubricating unit casing for an aircraft turbomachine. One problem with this known casing is that it is complicated to manufacture, in particular because the various cavities and pipes require many cores for manufacturing by foundry, or require complex supports for manufacturing by three-dimensional printing. Summary of the invention

One of the aims of the invention is to provide a housing for a lubrication unit which is particularly easy to manufacture, while meeting the constraints, for example of weight and strength, inherent in such equipment for an aircraft turbomachine. To this end, the invention provides a modular lubricating unit housing comprising a first housing element (called pumping housing), a second housing element (called filter housing) and a third housing element (called recovery housing) which are intended to be fastened together.

The pumping casing for a modular aircraft turbomachine lubrication unit casing comprises: - a first tube having a first cavity configured to receive a plurality of pumps stacked in a first direction, the first tube having a first tubular part and a second tubular part, - a sole fixed to the first tube and extending in a second direction and a third direction, the second and the third directions being mutually perpendicular and perpendicular to the first direction, - inlets in the first cavity , and an exit from the first cavity; the pump housing being arranged to be attached to a modular lubricating unit housing filter housing and a modular lubricating unit housing recovery housing to form the modular lubrication unit housing; the first tubular part being configured to be placed in a second through cavity of a second tube of the filter housing); and the second tubular portion being configured to be placed in a third cavity of a third tube of the recovery sump.

[0005] The sole preferably forms a fixing base. It can be designed to be fixed to a support, for example an accessory gearbox such as an AGB.

[0006] The inlets preferentially open into the filter housing. They are preferably arranged to allow radial entry of the fluid into the first cavity. They are preferably aligned in the first direction. The outlet preferably opens into the recovery housing. It is preferably designed to allow radial exit from the first cavity. It is preferably located at an angle between 115 and 160 ° with respect to the inlets. Such an angle allows good management of pressure drops and proper operation of the lubrication unit. It is preferably located closer to the sole than the inlets.

The filtration housing for a modular aircraft turbomachine lubrication unit housing comprises: - a second tube having a second through cavity, and - a recess configured to receive a filter, the filter housing being arranged to be fixed a lubricating group modular housing pump housing and a lubricating group modular housing recovery housing to form the lubricating group modular housing; the second cavity being configured to receive a first tubular portion of a first tube of the pump housing; and the pump housing, the filter housing and the recovery housing configured such that, when secured together, the filter is in a fluid path between an outlet of a first cavity of the first tube of the pump housing and an outlet of the modular housing of the lubrication unit.

[0008] For example, after leaving the first cavity, the fluid path of the fluid may comprise a passage in an oil reservoir, a second passage in the first cavity and then filtration by said filter. The filter is preferably removable, so that it can be cleaned and / or changed.

The recovery casing for an aircraft turbomachine lubrication unit modular casing comprises: - a third tube having a third cavity, and - inlets for the lubrication unit modular casing; the recovery housing being arranged to be attached to a modular lubrication group housing pump housing and a modular lubrication group housing filter housing to form the modular lubrication unit housing; the third cavity being configured to receive a second tubular portion of a first tube of the pump housing; and the pump housing, filter housing, and recovery housing configured such that, when secured together, inlets of a first cavity of the first tube are in a fluid path between the inlets of the modular unit housing lubrication and the first cavity.

[0010] Preferably, the recovery casing for the casing comprises a plurality of wells, each well being configured to receive a strainer, so that one of the strainers is on a fluid path between each inlet of the casing and each inlet in the first. cavity. The strainers are preferably removable. The recovery casing may also include locations intended to receive valves.

[0011] Thus, the invention provides a modular casing of a turbomachine lubrication unit, for example for an aircraft, comprising a pumping casing according to one embodiment of the invention, a filtration casing according to one embodiment of the invention, and a recovery casing according to one embodiment of the invention, fixed together.

The modular housing according to the invention therefore comprises three separate elements fixed together, preferably removably. This three-part distribution simplifies manufacture, in particular because the access to the inlets and outlets of the first cavity are accessible from the outside when the pump housing is isolated. In addition, this also makes it possible to reduce the weight of the elements during their manufacture, and this allows modularity of the housing.

The inventor has found that the modular housing was particularly robust, while remaining light, by arranging it so that the first tube fits into the second and the third cavities. Indeed, this allows blocking in the second and third directions.

Furthermore, the distribution of the modular housing into three elements simplifies maintenance because it is possible to replace one of the elements without replacing the others.

The lubrication group preferably operates as follows. The lubricating fluid coming from the turbojet is recovered by the inlets of the modular crankcase. It preferably passes through the strainers. It enters the first cavity through the inlets, and its pressure is increased there by a first part of the pumps of the first cavity. It exits through the outlet to enter a reservoir of lubricating fluid. On leaving the reservoir, it is pumped by a second part of the pumps of the first cavity, then it passes through the filter. It then leaves the modular casing, and therefore the group, through the outlet of the modular casing, to return to the turbojet.

The outlet of the modular casing is preferably located in the filtration casing or in the recovery casing. It could nevertheless be 5 in the pumping casing while remaining within the scope of the invention.

[0017] One function of the pump housing is to be a housing for the pumps. One function of the filter housing is to be a housing for the filter located at the outlet of the pumps. One function of the sump is to interface with the lubricating liquid inlets in the sump. The recovery sump can also serve as an interface for the outlet of lubricating liquid from the sump.

[0018] The three elements of the modular housing can be made of the same material, for example magnesium, aluminum, or as7g06 aluminum. It is also possible, while remaining within the scope of the invention, that they are made of different materials.

In one embodiment of the invention, the modular housing comprises a first seal between the sole and a first contact surface of the filter housing and / or a second seal between a second surface of contact of the filter housing and a contact surface of the recovery housing. The second contact surface is preferably opposite the first contact surface in the first direction.

In one embodiment of the invention, the modular casing comprises fixing means, each of the fixing means fixing together the pumping casing, the filtration casing and the recovery casing. For example, each of the fixing means is an object in mechanical contact with each of the three housing elements, so as to fix them together.

In one embodiment of the invention, the fixing means comprise rods passing through first holes located in the pumping housing, through second holes located in the filtration housing and through third holes located in the recovery housing.

In one embodiment of the invention, the rods are parallel to the first direction. Preferably, one of the first holes is aligned, in the first direction, with one of the second holes and with one of the third holes.

In one embodiment of the invention, the first holes are holes passing through the sole.

In one embodiment of the invention, the second holes are located around the second cavity. For example, the second holes can be rectilinear channels parallel to the first direction and extending along the second cavity, outside thereof.

[0025] In one embodiment of the invention, the third holes are located in a ring located around an entrance to the third cavity. The ring is preferably perpendicular to the first direction. The contact surface of the recovery housing is preferably a surface of said ring.

The ring is preferably perpendicular to the first direction. The contact surface of the recovery housing is preferably a surface of said ring.

In one embodiment of the invention, the pumping housing is in one piece, and / or the filtration housing is in one piece, and / or the recovery housing is in one piece room.

The invention further provides a set of parts for a modular aircraft turbomachine lubrication unit casing, comprising: - a plurality of identical pump casings, - a plurality of filter casings, preferably identical, and

a plurality of recovery casings, comprising different variants of the recovery casing, said variants differing at least in the position of the inlets.

The different variants of the recovery casing are all suitable for being fixed to the pumping casing and to the filtration casing. For example, the different variants can be designed so that the contact surface of the recovery housing is identical and / or the ring is identical and / or the third holes are placed identically. The entries in the recovery casing and / or the strainer wells may differ between two variants. If the outlet of the modular sump is on the recovery sump, it can also differ between two variants.

Such a set of parts makes it possible to keep in stock only one model (or a reduced number of models) for the pumping casing, while the inlets of the recovery casing are adapted according to the model of the turbomachine. . The pumping casing is then generic, and the recovery casing is specific.

[0031] || There may also be several variants of the filter casing, all of which can be attached to the pumping casing and to the recovery casing.

The different variants of the recovery casing, and potentially of the filtration casing, are preferably designed to be all compatible with the same fixing means.

The invention further provides a lubrication unit for an aircraft turbomachine, the casing of which is a modular casing consisting of a pumping casing according to the invention, a filtration casing according to the invention, and a recovery casing according to the invention, fixed together, the lubrication group further comprising a plurality of pumps stacked in a first direction in the first cavity, and a filter arranged in the recess. Thus, the modular housing forms the entire housing of the lubrication group. There is therefore no need for additional parts to form the lubricating unit housing.

[0034] The invention further provides a method of manufacturing a pump housing, a method of manufacturing a filter housing, and a method of manufacturing a recovery housing.

The invention further provides a method of assembling a casing according to any one of the embodiments of the invention, and comprising the following steps: - providing a pumping casing according to any one of embodiments of the invention, - providing a filtration casing according to any one of the embodiments of the invention, - providing a recovery casing according to any one of the embodiments of the invention, - fitting the first tube successively in the second cavity and in the third cavity.

[0036] The interlocking is preferably in the first direction. The interlocking implies that the first tube passes completely through the second cavity.

Brief description of the figures

Other characteristics and advantages of the invention will become apparent on reading the detailed description which follows, for the understanding of which reference is made to the attached FIG. 1, which is an exploded view of the various parts of a modular housing of a lubrication unit according to one embodiment of the invention.

Methods of carrying out the invention

The present invention is described with particular embodiments and references to a figure, but the invention is not limited thereby. The figure described is schematic and is not limiting.

In the context of this document, the terms "first" and "second" serve only to differentiate the different elements and do not imply order between these elements.

In the figure, identical or similar elements may bear the same references.

The lubrication unit, the modular casing of which is described in this document, is preferably designed for use in an aircraft turbomachine, for example a double-flow turbojet. As described in document BE2017 / 5656, such a turbojet can include two compressors, a combustion chamber and two turbines. In operation, the mechanical power of the turbines is transmitted via a central shaft to the rotors to set the compressors in motion. The rotation of the rotor around its axis of rotation thus makes it possible to generate an air flow and to gradually compress the latter up to the entrance of the combustion chamber. A fan is coupled to the rotor and generates a primary flow and a secondary flow. The secondary flow is thus accelerated so as to generate a thrust reaction necessary for the flight of an airplane. Reduction means can reduce the speed of rotation of the fan and / or of the low-pressure compressor relative to the associated turbine and / or to the corresponding transmission shaft. This shaft is preferably mounted to rotate by means of bearings housed in lubrication enclosures. The turbomachine may include a lubrication circuit supplying lubricating fluid, for example oil, to the bearings of the shafts and to the reduction means. In addition to lubricating moving parts, the lubricating fluid can cool them, and / or heat areas to be defrosted.

The lubrication circuit may include a recovery pump and a feed pump for each member or each lubrication chamber. The recovery pumps like the feed pumps are preferably combined in a lubrication group. Optionally, the lubrication group can pump lubricating fluid to and from a reservoir.

[0043] Figure 1 illustrates parts of a modular housing for a lubrication unit according to one embodiment of the present invention. The modular casing comprises a pump casing 10 forming a first modular casing element, a filter casing 20 forming a second modular casing member and a recovery casing 30 forming a third modular casing member. It preferably comprises fixing means 40 fixing the three elements 10, 20, 30 together.

The pump housing 10 comprises a first tube 11 and a sole 15 fixed to the first tube 11. The first tube 11 comprises a first cavity 12, preferably cylindrical with an axis parallel to the first direction 101, configured to receive a plurality of pumps superimposed in a first direction 101. The pumps can for example be gerotor pumps or vane pumps. The sole 15 extends in a second direction 102 and a third direction 103, the second 102 and the third 103 directions being mutually perpendicular and perpendicular to the first direction 101. The first tube 11 has a first tubular part 16 and a second one. tubular part 17, the first tubular part 16 being located between the sole 15 and the second tubular part 17. The pumping casing 10 comprises inlets 13 for bringing a fluid into the first cavity 12, and an outlet 14 for exiting a fluid of the first cavity 12. There are preferably as many inlets 13 in the first cavity 12 as there are pumps. The pumping casing 10 preferably comprises a contact surface 18 located on the sole 15, around the surface portion of the sole 15 which is in contact with the first tube 11. The pumping casing 10 preferably comprises first holes 19, for example passing through the sole 15 in the first direction 101. They preferably open into the contact surface 18.

The filter housing 20 comprises a second tube 21 having a second through cavity 22, preferably in the first direction 101, and preferably cylindrical with an axis parallel to the first direction 101, and a recess 24 configured to receive a filter . The recess 24 includes an opening for inserting and removing the filter. The opening is preferably such that the direction of introduction of the filter is perpendicular to the first direction 101. The filter housing 20 preferably comprises a first contact surface 23 and a second contact surface 28. The filter housing 20 comprises preferably second holes 29, for example around the second cavity 22. They preferably open out on the one hand into the first contact surface 23 and on the other hand into the second contact surface 28.

The recovery casing 30 comprises a third tube 31 having a third cavity 32, preferably cylindrical with an axis parallel to the first direction 101, and inlets 35 of the modular casing of the lubrication group which open out from the modular casing, and preferably an outlet 36 of the modular housing of the lubrication unit which opens out from the modular housing. The inlets 35 and the outlet 36 are preferably located in the same plane, for example in a plate 34. The plate 34 preferably extends in the first 101 and the third 103 directions. The recovery casing 30 preferably comprises a plurality of wells 37, each well 37 being configured to receive a strainer so that one of the strainers is on a fluid path between each inlets 35 of the modular case and each inlet 13 in the first cavity 12. The direction of introduction of the strainers into the wells is preferably parallel to the third direction 103. The recovery casing 30 preferably comprises a ring 38 having a contact surface 33 located around an opening of the third cavity.

32. The recovery casing 30 preferably comprises third holes 39, for example passing through the ring 38 in the first direction 101. They preferably open into the contact surface 33.

The housing preferably comprises a first seal between the sole 15, for example the contact surface 18, and the first contact surface 23 of the filter housing 20 and / or a second seal between the second contact surface 28 of the filter housing 20 and the contact surface 33 of the recovery housing 30.

During assembly of the housing, the first tubular part 16 is slid into the second cavity 22 so as to pass through it and the second tubular part 17 is slid into the third cavity 32. Fastening means 40 can be used to fix together the three elements 10, 20, 30.

In one embodiment of the invention, the fixing means 40 comprise rods 41 passing through the first holes 19, through the second holes 29 and through the third holes 39. They can also include locking elements 42 to block the rods 41 on one side, and / or nuts 43 to block the rods on the other side. The casing is preferably provided so that the rods 41 are parallel to the first direction 101.

When the housing is assembled, the lubricating fluid is collected by the various inlets 35. It passes through the strainers in the wells 37 then into the inlets 13 of the first cavity 12. There are preferably as many inlets 35 in the modular casing as inlets 13 in the first cavity 12, so as to have fluid communication between a single inlet 35 of the modular casing and a single inlet 13 in the first cavity 12. The lubricating fluid is then pumped by them. pumps then it passes through the outlet 14 of the first cavity 12. It passes into the filter located in the recess 24 and leaves the modular housing through the outlet 36.

The invention further provides a set of parts making it possible to assemble several casings, said casings each comprising a same pumping casing 10, a filtration casing 20, and a different recovery casing 30. This assembly therefore comprises several variants of the recovery casing 30, all compatible with the same pumping casing 10. It may also include several variants of the filtration casing 20, all compatible with the same pumping casing.

10.

In one embodiment of the invention, all the variants of the recovery casing 30 have their third holes 39 located at the same places. The contact surface 33 can also be identical in the different variants.

In one embodiment of the invention, all the variants of the filter housing 20 have their second holes 29 located at the same places. The first contact surface 23 can also be identical in the different variants. The second contact surface 28 can also be identical in the different variants.

In other words, the invention relates to a modular casing for an aircraft turbomachine lubrication unit comprising three casing elements. The first element, called pumping casing 10, comprises a first tube 11 designed to receive pumps and to serve as a male part around which the second element, called filter casing 20 and the third element, called recovery casing, are arranged. 30. The filtration casing 20 makes it possible to receive an outlet filter. The recovery casing 30 includes the inlets 35 of the modular casing.

The present invention has been described in relation to specific embodiments, which have a purely illustrative value and should not be considered as limiting. In general, the present invention is not limited to the examples illustrated and / or described below.

above.

The use of the verbs "to understand", "to include", "to include", or any other variant, as well as their conjugations, can in no way exclude the presence of elements other than those mentioned.

The use of the indefinite article "UN", "a", or of the definite article "the", "the" or "the", to introduce an element does not exclude the presence of a plurality of these elements.

Reference numbers in the claims do not limit their scope.

Claims (15)

Claims 1. Pumping casing (10) for a modular casing of an aircraft turbomachine lubrication unit, and comprising: ee a first tube (11) having a first cavity (12) configured to receive a plurality of pumps stacked in a first direction (101), the first tube (11) having a first tubular part (16) and a second tubular part (17), and a sole (15) fixed to the first tube (11) and extending in a second direction (102 ) and a third direction (103), the second (102) and the third (103) directions being perpendicular to each other and perpendicular to the first direction (101), e of the inlets (13) in the first cavity (12), and an outlet (14) from the first cavity (12); the pump housing (10) being arranged to be attached to a filter housing (20) for a modular lubrication unit housing and to a recovery housing (30) for a modular lubrication unit housing to form the modular unit housing lubrication; the first tubular part (16) being configured to be placed in a second cavity (22) passing through a second tube (21) of the filter housing (20); and the second tubular part (17) being configured to be placed in a third cavity (32) of a third tube (31) of the recovery housing (30). 2. Filtration casing (20) for a modular casing for an aircraft turbomachine lubrication unit, and comprising: e a second tube (21) having a second through cavity (22), and e a recess (24) configured to receive a filter, the filter housing (20) being arranged to be attached to a pump housing (10) for a modular lubrication unit housing and to a recovery housing (30) for a modular lubrication unit housing to form the modular unit housing lubrication; the second cavity (22) being configured to receive a first tubular portion (16) of a first tube (11) of the pump housing (10); and the pump housing (10), the filter housing (20) and the recovery housing (30) being configured so that, when secured together, the filter is in a fluid path between an outlet (14) of 'a first cavity (12) of the first tube (11) of the pump housing (10) and an outlet (36) of the modular housing of the lubrication group. 3. Recovery casing (30) for a modular casing for an aircraft turbomachine lubrication unit, and comprising: e a third tube (31) having a third cavity (32), and e inlets (35) of the modular casing of the lubrication group; the collector housing (30) being arranged to be attached to a modular lubricating unit housing pump housing (10) and to a modular lubricating unit housing filter housing (20) to form the modular unit housing lubrication; the third cavity (32) being configured to receive a second tubular part (17) of a first tube (11) of the pump housing (10); and the pump housing (10), the filter housing (20) and the recovery housing (30) being configured so that, when fastened together, inlets (13) of a first cavity (12) of the first tube (11) are in a fluid path between the inlets (35) of the modular lubricating unit housing and the first cavity (12). 4. Recovery casing (30) according to the preceding claim, comprising a plurality of wells (37), each well (37) being configured to receive a strainer, so that one of the strainers is on a fluid path between each inlet ( 35) of the housing and each inlet (13) in the first cavity (12). 5. Modular casing of a turbomachine lubrication unit, for example for an aircraft, comprising a pumping casing (10) according to claim 1, a filter casing (20) according to claim 2, and a recovery casing (30). ) according to claim 3 or 4, secured together. 6. Modular housing according to the preceding claim, comprising a first seal between the sole (15) and a first contact surface (23) of the filter housing (20) and / or a second seal between a second contact surface (28) of the filter housing (20) and a contact surface (33) of the recovery housing (30). 7. Modular casing according to claim 5 or 6, comprising fixing means (40), each of the fixing means (40) fixing together the pumping casing (10), the filter casing (20) and the recovery casing. (30). 8. Modular housing according to the preceding claim, wherein the fixing means (40) comprise rods (41) passing through first holes (19) located in the pump housing (10), through second holes (29) located in the filter housing (20) and through third holes (39) located in the recovery housing (30). 9. Modular housing according to the preceding claim, wherein the rods (41) are parallel to the first direction (101). 10. A modular housing according to claim 8 or 9, wherein the third holes (39) are located in a ring (38) located around an entrance of the third cavity (32). 11. Modular housing according to any one of claims 5 to 10, wherein the pumping housing (10) is in one piece, and / or the filter housing (20) is in one piece, and / or the recovery housing (30) is in one piece. 12. A set of parts for a modular aircraft turbomachine lubrication unit casing, and comprising: e a plurality of pump housings (10) according to claim 1, which are identical, e a plurality of filter housings (20) according to claim 2, preferably identical, and e a plurality of recovery casings (30) according to claim 3 or 4, comprising different variants of the casing recovery casing (30), said variants differing at least by the position of the inlets (35) . 13. Aircraft turbomachine lubrication unit, the casing of which is a modular casing consisting of a pumping casing (10) according to claim 1, a filter casing (20) according to claim 2, and a recovery casing (30). ) according to claim 3 or 4, fixed together, the lubrication group further comprising a plurality of pumps stacked in a first direction (101) in the first cavity (12), and a filter arranged in the recess (24). 14. A method of manufacturing a pump housing (10) according to claim 1, and / or a filter housing (20) according to claim 2, and / or a recovery housing (30) according to claim 3 or 4. 15. A method of assembling a modular housing according to any one of claims 5 to 11, and comprising the following steps: e providing a pumping housing (10) according to claim 1, e providing a filter housing (20). ) according to claim 2, providing a recovery casing (30) according to claim 3 or 4, e fitting the first tube (11) successively into the second cavity (22) and into the third cavity (32).