WO2018082837A1

WO2018082837A1 - Housing arrangement for a turbomachine, and method for assembling a housing arrangement of this type

Info

Publication number: WO2018082837A1
Application number: PCT/EP2017/072954
Authority: WO
Inventors: Rüdiger BACKASCH; Andreas Mucha
Original assignee: Siemens Aktiengesellschaft
Priority date: 2016-11-04
Filing date: 2017-09-13
Publication date: 2018-05-11
Also published as: DE102016221664A1

Abstract

The invention relates to a housing arrangement (10) for a turbomachine, comprising an inner housing (12), an outer housing (14) which encloses the inner housing (12) at least partially, and a sealing ring (16) for radial sealing between the inner housing (12) and the outer housing (14). In order to make an assembly of the housing arrangement (10) possible here in a simple and reliable way and without the risk of damage of the sealing ring (16), it is provided according to the invention that a radially outer section of the sealing ring (16) is arranged in an inner circumferential groove (20) of the outer housing (14), and a radially inner section of the sealing ring (16) bears against an outer circumferential face (22) of the inner housing (12), that the sealing ring (16) is interrupted at one point, and that the outer housing (14) has a radial through opening (28) adjacently with respect to the interruption point of the sealing ring (16). The invention relates, furthermore, to a method for assembling a housing arrangement (10) of this type.

Description

description

Housing assembly for a turbomachine, and method for mounting such a housing assembly

The present invention relates to a housing assembly for a turbomachine, in particular z. B. steam turbine, according to the preamble of claim 1, and a method for assembling such a housing assembly.

Such a housing arrangement is known for example from the patent publication WO 2009/112299 AI. The known housing arrangement comprises an inner housing, an outer housing enclosing the inner housing, and two (visible in the drawing) sealing rings for radial sealing between the inner housing and the outer housing, said sealing rings are each arranged in an outer circumferential groove of the inner housing and a radially outer portion the sealing rings in each case bears against an inner circumferential surface of the outer housing.

The problem here is the assembly of the housing assembly.

According to an internal state of the art of the applicant, in such a housing assembly, an adhesive is first placed in the respective groove and then a broken at one point sealing ring inserted into the groove and compressed by a corresponding device and for a certain period of time in this state in the groove held so that the sealing ring is glued clamped in the groove.

As long as the sealing ring is held by the adhesive in the groove, the inner housing without obstruction by the sealing ^¬ ring can be mounted in the outer housing. However, it has been shown that the adhesive does not always reliably hold ^¬ or by bonding the sealing ring through the outer housing during assembly, the bond is released. Consequently, it can in this assembly process to a Clamping or folding of the sealing ring and further damage, in particular of the sealing ring come.

It is therefore an object of the present invention to improve a housing arrangement of the type mentioned above or a method for mounting such a housing assembly so that the assembly in a simple and reliable manner and without the risk of damage to the sealing ring he can follow ^¬ .

According to the invention this object is achieved by a

Housing arrangement according to claim 1 or a method for assembling a housing arrangement according to claim 4. The dependent claims relate to advantageous developments of the invention.

The housing arrangement according to the invention is characterized in that a radially outer portion of the sealing ring is disposed in an inner circumferential groove of the outer housing and a radially inner portion of the sealing ring on an outer circumferential surface (mating surface) of the inner housing rests that the sealing ring is interrupted at one point, and that the outer housing adjacent to the point of interruption of the sealing ^¬ ring has a radial passage opening.

A first special feature of the invention

Housing arrangement thus consists in that the sealing ring is arranged in an inner circumferential groove of the outer housing, so that by a (temporary) spreading of the sealing ring a simple and reliable mounting of the inner housing in the

Outer housing can be done. This feature is synergistically related to a second feature, which is that the outer housing adjacent to the

Breaking point of the sealing ring has a radial passage opening. This through hole makes it possible NaEM ^¬ Lich, by means of a corresponding (pin-like) tool from the outside through the through opening to the lower To reach breaking parts of the sealing ring and spread the sealing ring with it.

In one embodiment of the housing arrangement, the passage opening of the outer housing is closed (subsequently again).

In a development of this embodiment, the passage opening of the outer housing is provided with an internal thread and closed by means of a threaded pin and / or by means of a screw cap.

In the case of a double-walled outer housing in the region of the passage opening, the passage opening is formed by a first (inner) and a second (outer) opening through the relevant walls. In this case, the at ^¬ the openings are preferably aligned coaxially with one another, where ^¬ at the second opening z. B. may also have a larger diameter than the first opening.

The inventive method for mounting a

Housing arrangement of the type described here includes the

Steps: - inserting the sealing ring into the inner circumferential groove of the Au ^¬ ßengehäuses,

Inserting a pin from the outside into the radial passage opening of the outer housing, so that a front end of the pin enters the point of interruption of the sealing ring and thus spreads the sealing ring,

Inserting the inner housing into the outer housing, removing the pin from the passage opening of the outer housing so that the sealing ring relaxes and the radially inner portion of the sealing ring thus abuts against the outer peripheral surface of the inner housing. In one embodiment, the front end of the pin (tool) used in the mounting method is tapered. For example, the front end of the pin may be conical or frustoconical.

In one embodiment of the housing arrangement or of the assembly method, it is provided that sealing ring ends adjacent to the point of interruption of the sealing ring are formed with oblique surfaces. Such inclined surfaces (not radially ver ^¬ running) can advantageously contribute to simplify the mentioned spreading of the sealing ring. In particular, the inclined surfaces z. B. be formed so that a measured in the circumferential direction of the sealing ring distance between see see the sealing ring ends from radially outside to radially inside decreases. One at its point of interruption formge ^¬ stalteter sealing ring can advantageously z. B. are also spread by a cylindrical shape shaped front end of an inserted into the through ^¬ opening pin.

In one embodiment of the housing arrangement or the mounting method is provided that the passage opening of the outer housing is provided with an internal thread. In one embodiment of the assembly method can be provided in this case that the pin is hen with an external thread verse ^¬ hen and the pin is introduced by screwing into the passage ^¬ opening.

In one embodiment of the assembly method, the inner housing is inserted by an axial insertion into the outer housing. This procedure is, for example, then required oh ^¬ nehin when the outer housing as a so-called pot housing (and without axial and / or radial pitch) is pre ^¬ see.

In one embodiment of the assembly method, the

Through opening of the outer housing closed after removal of the pin. In particular, this sealing can z. B. by screwing a threaded pin in the through hole and / or by screwing a

Screw on a cover accessible on the outside of the outer housing mouth of the through hole.

According to a further aspect of the invention, a turbo ^¬ machine, in particular z. As a steam turbine, proposed, comprising a housing assembly of the type described here. The inner housing may in this case be provided in a manner known per se for accommodating a rotor equipped with rotor blades and for forming a flow region of the turbomachine (eg steam engine). Further, the inner housing can be on the inside with shovels Leit ^¬ and / or be provided at least one guide vane carrier for fastening of vanes.

In addition to the use of the described housing arrangement or the described assembly method for a steam turbine is a use in particular z. B. for a gas turbine into consideration.

The invention will be further described by means of embodiments with reference to the accompanying drawings. They show:

1 is an axial sectional view of a housing assembly according to an embodiment,

Fig. 2 radial section view of the housing assembly

Fig. 1 along the line II-II, and

Fig. 3 is an enlarged view of a designated in Fig. 2 with x details.

FIGS. 1 and 2 show a housing arrangement 10 for a steam turbine, comprising an approximately tubular inner housing 12, an inner housing 12 enclosing and also approximately tubular outer housing 14, and a sealing ring 16 for ra ^¬ dialen seal between the inner housing 12 and the outer housing 14th

FIG. 1 shows, for the sake of simplicity, only one axial subregion of the axial section which essentially continues to extend in the axial direction

Housing assembly 10, namely in the region of the sealing ring 16, and Fig. 2 shows accordingly this sealing ring 16 containing radial section. In the described Ausführungsbei ^¬ game the outer housing 14 is executed in the illustrated axial part ^¬ area double-walled. Likewise for the sake of simplicity, FIGS. 1 and 2 do not show the "internals" of the housing arrangement 10 required for the formation of the relevant steam turbine. This concerns z. B. arranged in the interior of the inner housing 12 angeord ^¬ Neten and equipped with blades rotor and on an inner peripheral surface 18 of the inner housing 12 arranged vanes or Leitschaufelträger.

Lastly, to FIGS. 1 and 2 to be noted Fig. That it is in each case by "combination representations" is where in each case the left half of the drawing an "assembled state" and in the respective right half of the drawing an "Betriebszu ^¬ stand" is illustrated.

The "mounting state" here is the situation in which the inner housing 12 is mounted in the outer housing 14. In ^¬ is asked embodiment, this assembly is carried out by axial insertion of the inner housing 12 in the Außengehäu ^¬ se 14. The "operating state" is the amount of situation in which the inner housing is already installed in the outer housing 14 12th Subsequently, the structure of the assembled housing assembly 10 with reference to the respective right Hälf ^¬ th of Fig. 1 and Fig. 2, described (operating condition). In this fully assembled state, a radially outer portion of the seal ring 16 is disposed in an inner circumferential groove 20 of the outer housing 14, and a radially inner portion of the seal ring 16 abuts an outer peripheral surface 22 of the inner housing 12.

The contact force is provided here by the sealing ring 16 itself, the inner diameter of which is so large or slightly smaller than the diameter of the outer peripheral surface 22 of the inner housing 12 in the region where the sealing ring 16 is applied.

For a good sealing effect, it is also expedient if a height of the sealing ring 16 measured in the axial direction of the housing arrangement 10 is at most slightly smaller than the width of the inner circumferential groove 20 measured in the same direction.

Should in view of the mounting process described further below ^¬ in the radial direction of the

Housing assembly 10 measured depth of the inner circumferential groove 20 should be at least as large as the measured in the same direction width of the sealing ring 16, since in this case advantageously complete sealing of the sealing ring 16 during the assembly process in the inner circumferential groove 20 is made possible.

The sealing ring 16 is interrupted at one point, wherein the outer housing 14 adjacent to the point of interruption of the sealing ring 16 has a radial passage opening 24. Due to the double-walledness of the outer housing 14 in the presented Darge ^¬ axial portion of the housing assembly 10, the radial through hole 24 is formed in this example of a first opening 24-1 (through the "inner wall" through) and a coaxially disposed second opening 24-2 (through the "outer wall").

The passage opening 24 is expediently closed, as also shown in the figures. For this purpose, the openings 24-1 and 24-2 are each provided with an internal thread and by means of a threaded pin 26 (in the opening 24-1) and by means of a screw cap (screw plug) 28 (at the outer mouth of the opening 24-2) locked.

Hereinafter, referring to the respective left halves of Fig. 1 and Fig. 2, the method for mounting the

Housing assembly 10 described in more detail. In a first step, the sealing ring 16 is inserted into the inner circumferential groove 20 of the outer housing 14 in such a way that its point of interruption is aligned with the passage opening 24. The sealing ring 16 can advantageously be slightly compressed due to its interruption and then relaxed into the inner circumferential groove 20.

In a second step, a pin-shaped tool, here a screw 30, introduced from the outside into the through hole 24 of the outer housing 14, so that a front end of the screw 30 enters the point of interruption of the sealing ring 16 and thus spreads the sealing ring 16. The ^{insertion of} the screw 30 takes place by screwing it into the opening 24-1 provided with a corresponding internal thread. The resulting state is shown in Figs. 1 and 2 (left half of the drawing, respectively).

In a third step, the inner housing is inserted into the Au ^¬ ßengehäuse 14 12th In the example shown, the inner housing 12 in particular in the axial direction of the

Housing assembly 10 are inserted. Furthermore, z. B. in this step, in practice, also provided for the formation of the relevant turbomachine rotor together with the inner housing 12 are installed. In a fourth step, the screw 30 is removed again from the passage opening 24, here by unscrewing it from the opening 24-1 and removing it through the larger opening 24-2 in this case. As a result, the sealing ring 16 relaxes, and its radially inner portion thus abuts against the outer peripheral surface 22 of the inner housing 12.

In a fifth step, the passage opening 24 is closed again. For this purpose, the threaded pin 26 is first screwed into the opening 24-1 and then screwed the screw 28 into the opening 24-2. The re ^¬ sultierende state in the respective right halves of the drawing ^¬ Fig. 1 and Fig. 2 can be seen.

FIG. 3 is an enlarged view of the detail marked x in FIG. 2. FIG. From this it can be clearly seen that the front end of the screw 30 is tapered, so that upon insertion of the screw 30 a force is applied to the sealing ring 16 at sealing ring ends 16-1 and 16-2.

Alternatively or in addition to such a taper of the tool end comes z. B. in consideration, deviating from the apparent in Fig. 2 example, the sealing ring ends 16-1, 16-2 not with radial end surfaces but with inclined surfaces, so that z. B. also a non-tapered end or z. B. cylindrical end of the tool (here: screw 30) for spreading the sealing ring 16 is suitable.

The invention and the described embodiment of a housing assembly 10 is particularly suitable for ^{Ausgestal ¬} tion of a steam turbine, z. B. in an axial portion of a turbine housing, in which an inflow of

Main steam or a discharge of exhaust steam is provided.

Claims

Housing means (10) for a turbomachine, comprising an inner housing (12), a said inner housing (12) Wenig ^¬ least partially enclosing the outer housing (14), and egg ^¬ NEN sealing ring (16) for radial sealing between the inner housing (12) and the Outer housing (14),

characterized in that a ra ^¬ dial outer portion of the sealing ring (16) in a nenumfangsnut inner (20) of the outer housing (14) is arranged and a radially inner portion of the sealing ring (16) on an outer peripheral surface (22) of the inner housing (12) is located on ^¬ that the sealing ring (16) at a location is unterbro ^¬ surfaces, and that the outer housing (14) adjacent the point of interruption of the sealing ring (16) has a radial through-hole (24).

Housing assembly (10) according to claim 1, wherein the passage opening (24) of the outer housing (14) is closed.

Housing assembly (10) according to claim 2, wherein the passage opening (24) of the outer housing (14) is provided with an internal thread and by means of a threaded pin (26) and / or by means of a screw cap (28) ver ^{¬ is} closed.

A method of assembling a housing assembly (10) according to any one of claims 1 to 3, comprising the steps

Inserting the sealing ring (16) into the inner circumferential groove (20) of the outer housing (14),

- Introducing a pin (30) from the outside into the radial passage opening (24) of the outer housing (14), so that a front end of the pin (30) enters the Unterbre ^¬ chungsstelle the sealing ring (16) and thus the sealing ring (16) spreads,

Inserting the inner housing (12) into the outer housing (14), - Removing the pin (30) from the through hole (24) of the outer housing (14), so that the sealing ring (16) relaxes and the radially inner portion of the sealing ring (16) thus on the outer peripheral surface (22) of the inner housing (12 ) applies.

5. The method of claim 4, wherein the front end of

Pen (30) is tapered.

A method according to claim 4 or 5, wherein adjacent to the Unterbre ching site of the sealing ring (16) adjacent Dichtrin ^¬ ing (16-1, 16-2) are formed with inclined surfaces.

Method according to one of claims 4 to 6, wherein the through opening (24) of the outer housing (14) with an internal thread and the pin (30) is provided with an external thread and the pin (30) by screwing into the through hole (24) is introduced ,

Method according to one of claims 4 to 7, wherein the inner housing (12) is inserted by an axial insertion into the outer housing (14).

9. The method according to any one of claims 4 to 8, wherein the

Through opening (24) of the outer housing (14) after removal of the pin (30) is closed.

10. Turbomachine, in particular steam turbine, comprising a housing arrangement (10) according to one of claims 1 to 3.