Heat exchanger for a turbomachine

Abstract

An annular heat exchanger with a longitudinal axis for a turbomachine, intended for example to be supported by an annular shell of a casing of the turbomachine, includes a one-piece annular part having a first fluidic circuit having at least one first conduit and at least one second conduit extending annularly and a second fluidic circuit having at least one first conduit and at least one second conduit extending annularly and arranged in a direction perpendicular to the longitudinal direction on either side of the first conduit and second conduit of the first circuit.

Claims

1. An annular heat exchanger with a longitudinal axis for a turbomachine, comprising: a one-piece annular part comprising a first fluidic circuit comprising a first conduit and a second conduit extending annularly and a second fluidic circuit comprising a third conduit and a fourth conduit extending annularly and arranged in a direction perpendicular to the longitudinal axis on either side of the first conduit and second conduit of the first circuit wherein the first and second conduits of the first circuit and the third and fourth conduits of the second circuit open at a first end of said annular part into a cavity which opens in a circumferential direction and into which is inserted a first sealing member which is shaped so as to: delimit with the annular part at least a first channel for fluidic connection of the first conduit of the first circuit with the second conduit of the first circuit, and delimit with the annular part at least one second channel for fluidic connection of the third conduit of the second circuit with the fourth conduit of the second circuit, the second channel being fluidically independent of the first channel.

2. The annular heat exchanger according to claim 1, in which the first sealing member comprises external grooves in which sealing gaskets are engaged.

3. The annular heat exchanger according to claim 1, in which the first sealing member comprises a wall extending in the direction perpendicular to the longitudinal axis and delimiting with the annular part two parallel second connecting channels.

4. The annular heat exchanger according to claim 3, wherein one of the two second connecting channels is arranged radially outside the other of the two second connecting channels, which are fluidly separated from each other by the wall of the first sealing member.

5. The annular heat exchanger according to claim 4, in which the first sealing member is locked in the cavity by a plate applied at a circumferential end of said annular part.

6. The annular heat exchanger according to claim 1, in which the third and fourth conduits of the second fluidic circuit are closed off by second members.

Description

BRIEF DESCRIPTION OF THE FIGURES

(1) FIG. 1 is a schematic perspective view of a turbomachine according to the known technique;

(2) FIG. 2 is a schematic perspective view of a portion of an annular heat exchanger mounted in the turbomachine of FIG. 1;

(3) FIG. 3 is a schematic illustration of the exchanger of FIG. 2 and the flow of oil therein;

(4) FIG. 4 is a schematic perspective view of a first end of a heat exchanger according to the invention:

(5) FIGS. 5A and 5B are schematic perspective views of sealing members mounted on said end of the heat exchanger;

(6) FIG. 6 is a schematic perspective view of the first end of the exchanger with another sealing plate mounted on said end;

(7) FIG. 7 is a schematic view of the first end of the heat exchanger according to the invention in a sectional plane perpendicular to the longitudinal axis as illustrated by the inset arrows A;

(8) FIG. 8 is a schematic sectional view of said first end of the heat exchanger, the oil circulation being illustrated.

DETAILED DESCRIPTION

(9) Reference is now made to FIGS. 4 to 8 which represent a heat exchanger according to the invention. Similarly to what has been described with reference to FIG. 3, the exchanger 12a also comprises a first fluidic circuit 37 of oil comprising a plurality of first conduits 38 and second conduits 40 substantially parallel to each other, the first conduits 38 comprising first and second portions 38a. The exchanger 12a also comprises a second thawing fluid circuit 42 comprising a first conduit 44 and a second conduit 46 which are parallel, the first conduit 44 comprising a first portion 44a and a second portion.

(10) The first conduits 38, 44 and second conduits 40, 42 of the first and second circuits 37, 42 are quite similar to what has been described previously with reference to FIG. 3 and differ from them only in their fluid connection to each other at the circumferential ends of the heat exchanger. Also, what will be described with reference to the first circumferential end 13 of the heat exchanger 12a is also valid for the second opposite circumferential end. Thus, the description will be made and shown only in relation to the first circumferential end 13 of the exchanger 12a using the second portion of the first conduit 38 of the first circuit 37 and the second conduit 40 of the first circuit 37 as well as using the second portion of the first conduit 38 and the second conduit 46 of the second circuit 42.

(11) The invention therefore proposes to provide a fluid connection of the first conduits 38 and second conduits 40 of the first circuit 37 and the fluid connection of the first conduit 44 and the second conduit 46 of the second circuit 42 without having to use a member structurally independent connection of the annular part 48 of the heat exchanger.

(12) In order to achieve, the heat exchanger, we first of all obtain a preform of the annular part 48 of the exchanger 12a which is made of a material which is a good conductor of heat, for example, an aluminium alloy. For this, a die is used to obtain simultaneously the first conduit 38 and the second conduit 40 of the first circuit 37 and the first conduit 44 and the second conduit 46 of the second circuit 42. At the end of this stage, the first conduits 38, 44 and second conduits 40, 46 of the first 37 and second 42 circuits extend from the first end 13 to the second end of the annular part 48 and open in a circumferential direction at the said ends. In a further step, a cavity is formed in the radial thickness of the annular part 48, the cavity being delineated by dotted lines in FIG. 8 and referenced 50. The second portions 38a of the first conduits 38 and the second conduits 40 of the first circuit 37 lead into this cavity. Also, since the first portion 44a of the first conduit 44 of the second circuit 42 and the second conduit 46 of the second circuit 42 opens only circumferentially at the level of the circumferential end face of the annular part 48, lateral bores 54 are made allowing the first portion 44a of the first conduit 44 of the second circuit 42 as well as the second conduit 46 of the second circuit 42 to communicate with the aforementioned cavity 50.

(13) In order to allow an independent oil circulation between the first circuit 37 and the second circuit 42 at the first end 13, a first sealing element 52 is added which is shaped in a special way, i.e.: to delimit with the annular part 48 at least a first fluid connection channel 55 of the first conduit 38 of the first circuit 37 with the second conduit 40 of the first circuit 37 and with, and to delimit with the annular part 48 at least one second fluidic connecting channel 56, 58 of the first conduit 44 of the second circuit 42 with the second conduit 46 of the second circuit 42, the second connecting channel 56, 58 being fluidically independent of the first connecting channel 55.

(14) In order to understand how the first sealing member 52 partly delimits the first connecting channel 55 and the second connecting channel 56, 58, we will now describe it. In particular, this one, shown in FIG. 5A, has an elongated shape in the longitudinal direction. In the circumferential direction, it comprises a first part 52a and a second part 52b which are substantially identical to each other and symmetrical to each other with respect to the median plane which is in position in the turbomachine a radial plane. The first part 52a and the second part 52b are connected to each other by a substantially flat connecting wall 52c which extends in a direction perpendicular to the longitudinal direction. The first part 52a and the second part 52b each comprise an annular groove 62 in which an annular seal 64 is mounted (FIGS. 5A and 7).

(15) The first sealing member 52 is mounted as a seal in cavity 50 of the annular part, with the ring seals 64 mounted in grooves 62. The end face of the first section 52a of the first organ 52 facing and at a distance from the outlets of the first sections 38a of the first ducts 38 and the outlets of the second ducts 40 forms an oil flow face in the first connecting channel 55. Also, the first sealing member 52 is dimensioned and the holes 54 are positioned on the annular part 48 in such a way that hole 54 of the second portion 44a of the first conduit 44 and hole 54 of the second conduit 46 open into the second connecting channel 56, 58. Specifically, it can be seen that each hole 54 is fluidly connected to two substantially parallel second connecting channels 56, 58, with the connecting wall 52c of the first sealing member 52 radially separating the two second connecting channels 56, 58. It can also be seen that the seals 64 provide a fluid seal between the first circuit 37 and the second circuit 42.

(16) Second sealing elements 66 are inserted, at the first end 13, in the outlet of the second portion 44a of the first conduit 44 of the second circuit 42 and in the outlet of the second conduit 46 of the second circuit 42. Each of the second sealing elements 66 comprises an annular groove 68 in which a seal 68 is mounted in a similar manner to that described with reference to the first organ 52, the function being identical.

(17) In order to keep the first sealing element 52 and the second sealing elements 66 in position despite the oil pressure, a plate 70 is applied to these elements at the circumferential end face. This plate is screwed into the ring section with screws 72.