Housing arrangement for a turbomachine as well as turbomachine arrangement having such a housing arrangement and method for manufacturing the housing arrangement

Abstract

The present invention relates to a housing arrangement for a turbomachine, comprising a support element, which is configured to bear a shaft, and a housing, which is centered at the support element. The housing is composed of an inner housing and an outer housing fastened at the support element, the housings being connected to each other by at least one connecting strut. A press fit is provided between the support element and the inner housing, in order to center the inner housing at the support element.

Claims

1. A housing arrangement for a turbomachine, comprising: a support element, which is configured for bearing a shaft; a housing, which is centered at the support element; wherein the housing has an inner housing and an outer housing fastened at the support element, which housings are connected to each other by at least one connecting strut; and wherein between the support element and the inner housing, a press fit is provided to center the inner housing at the support element.

2. The housing arrangement according to claim 1, wherein the outer housing has a bolt flange with a through hole for receiving a bolt, by which the outer housing is fastened at the support element, wherein the through hole is arranged at a position that, in relation to an axis of the shaft, is situated radially outside of the press fit.

3. The housing arrangement according to claim 1, wherein the support element has an outer shell surface and the inner housing has an inner shell surface, between which the press fit is provided.

4. The housing arrangement according to claim 3, wherein the support element has a flange surrounding an axis of the shaft and at which the outer shell surface is provided.

5. The housing arrangement according to claim 4, wherein the inner housing has a flange surrounding an axis of the shaft and at which the inner shell surface is provided.

6. The housing arrangement according to claim 3, wherein the inner housing has a flange surrounding an axis of the shaft and at which the inner shell surface is provided.

7. The housing arrangement according to claim 1, wherein, in a region of the press fit between the support element and the inner housing, a seal is arranged for sealing between the support element and the inner housing.

8. The housing arrangement according to claim 1, wherein a shaft seal is arranged between the inner housing and the shaft.

9. The housing arrangement according to claim 1, wherein the at least one connecting strut, is sufficiently elastic that the inner housing and the outer housing can undergo different thermal expansions.

10. The housing arrangement according to claim 9, wherein, in relation to its length, the at least one connecting strut is thinly formed in such a way that the at least one connecting strut is sufficiently elastic that the inner housing and the outer housing can undergo different thermal expansions.

11. The housing arrangement according to claim 9, wherein the at least one connecting strut is produced from a soft, elastic material, which is sufficiently elastic that the inner housing and the outer housing can undergo different thermal expansions.

12. The housing arrangement according to claim 1, wherein the shaft is borne in the support element by a bearing.

Description

BRIEF DESCRIPTION OF THE DRAWING FIGURES

(1) Additional advantageous enhancements of the present invention ensue from the dependent claims and the following description of preferred embodiments. Shown for this purpose, in a partially schematic manner, are:

(2) FIG. 1 a housing arrangement and a turbomachine arrangement in accordance with an embodiment of the present invention; and

(3) FIG. 2 a housing arrangement and a turbomachine arrangement in accordance with the prior art.

DESCRIPTION OF THE INVENTION

(4) FIG. 1 shows a housing arrangement and a turbomachine arrangement in accordance with an embodiment of the present invention. The housing arrangement and the turbomachine arrangement are a component part of a turbomachine, such as, for example, of an aircraft engine. The housing arrangement has a support element 1, which is configured to bear a shaft 2. The support element 1 has a first section 17, which is directed essentially vertically relative to an axis of the shaft 2 and, radially inside thereof, a second section 18, which revolves around the shaft 2. In the second section 18 of the support element 1, a bearing 13 is provided, which bears the shaft 2. In the present exemplary embodiment, the bearing 13 is designed as a roller bearing.

(5) The housing arrangement further has a housing 14, which is centered at the support element 1. The housing 14 is composed of an inner housing 3 and an outer housing 4 fastened at the support element 1, these housings being connected to each other by at least one connecting strut 5. Provided between the support element 1 and the inner housing 3 is a press fit 6 in order to center the inner housing 3 at the support element 1.

(6) The outer housing 4 has a bolt flange 7, which has a through hole 8 for receiving a bolt 9 and by which the outer housing 4 is fastened at the support element 1, with the through hole 8 being arranged at a position that, in relation to an axis of the shaft 2, is situated radially outside of the press fit 6. The bolt flange 7 rests against the first section 17 of the support element 1, which is aligned essentially vertically to an axis of the shaft 2.

(7) The support element has 1 an outer shell surface and the inner housing 3 has an inner shell surface, between which the press fit 6 is provided. In this case, the support element 1 has a flange 16, which surrounds an axis of the shaft 2, and at which the outer shell surface is provided. Here, the inner housing 3 has a flange 19, which surrounds the axis of the shaft 2 and at which the inner shell surface is provided.

(8) In relation to the axis of the shaft 2, the fastening of the outer housing 4 is situated at the support element 1 at a radially outer relative position by means of the bolt flange 7, the press fit 6 is situated at a radially middle relative position, and the second section 18 of the support element 1 for receiving the bearing 13 is situated at a radially inner relative position. In this way, the fabrication tolerances in the region of the flanges 16, 19 can turn out to be much higher than in the prior art, because the nominal dimensions have become smaller. More specifically, the press fit 61 of the prior art was replaced by the press fit 6 according to the invention, which is arranged radially further inward and thus has a smaller radius.

(9) The combination of the bolt connection 9, which is provided at the outer housing 4, and the press fit 6, which is radially spaced apart from it at the inner housing 3, leads overall, in comparison to the previously described prior art, to a more stable seating of the housing 14 at the support element 1. In addition, the assembly and disassembly of the housing 14 to and from the support element 1 is relatively simple, because the housing 14 is initially centered via the press fit 6 at the support element 1. Afterwards, the housing 14 can be bolted onto the support element 1 by the bolt 9. In this case, a re-centering of the through hole 8 of the outer housing 4 at a through hole provided in the support element 1 is not necessary.

(10) In a region of the press fit 6 between the support element 1 and the inner housing 3, an O-ring 10 is provided for sealing between the support element 1 and the inner housing 3. It has been found that the pressing of the O-ring 10 in the press fit 6 does not pose any problem in practice. Furthermore, at the inner housing 3 is arranged a shaft seal 11, 12 for the shaft 2. In the present exemplary embodiment, the shaft seal 11, 12 is formed by a mechanical ring seal 11 and a groove seal 12. The shaft seal 11, 12 is accommodated in a seal mount 15. The seal mount 15 is composed of a flange, which is formed at the outer housing 4 and revolves around the axis of the shaft 2.

(11) The at least one connecting strut 5 is sufficiently elastic that the inner housing 3 and the outer housing 4 can undergo different thermal expansions. This can be achieved, for example, by a relatively thin wall thickness of the connecting strut 5 or through the utilization of a relatively soft material for the connecting strut 5. In the region of the press fit 6, as a rule, no relative displacement between the support element 1 and the inner housing 3 is possible. However, radially above the press fit 6, a relative displacement between the support element 1 and the inner housing 3 is possible, because the connecting strut 5 has the corresponding elasticity. Radially below the press fit 6, a relative displacement between the inner housing 3 and the shaft 2 is likewise possible, because the shaft seal 11, 12 can be shifted axially to a certain extent with respect to the shaft 2.

(12) An exemplary embodiment of a turbomachine arrangement is composed of the previously described housing arrangement and the shaft 2, which is borne in the support element 1 by means of the bearing 13. In this case, the bearing 13 is secured at the shaft 2 and at the support element 1 via locking rings.

(13) During manufacture of the housing arrangement, the support element 1 is produced and is configured to bear the shaft 2. Moreover, the housing 14 is produced with the inner housing 3 and the outer housing 4, which are connected to each other through the at least one connecting strut 5. Subsequently, the inner housing 3 is centered at the support element 1 by means of the press fit 6 between the inner housing 3 and the support element 1. Afterwards, the outer housing 4 can be fastened at the support element 1 by means of the bolt 9.

(14) Although, in the preceding description, exemplary embodiments were explained, it is noted that a large number of modifications are possible. Moreover, it is noted that the exemplary embodiments are solely examples, which are not intended to limit the protective scope, the applications, and the structure in any way. Instead, the preceding description provides the person skilled in the art with a guideline for the implementation of at least one exemplary embodiment, with it being possible to make diverse changes, in particular in regard to the function and arrangement of the described component parts, without leaving the protective scope that ensues from the claims and the combinations of features equivalent to said claims.