DE1059474B - Connection of a steam supply line to a housing, in particular a turbine housing - Google Patents

Description

GERMAN

The invention relates to the difficult problem of connecting live steam supply lines for steam at the highest temperatures on housings, especially turbine housings. It is one for this Solution known in which an austenitic tube for the steam supply to nozzle bodies by means of an annular shoulder is clamped in a bore in the turbine housing.

With such an arrangement there is a relatively large heat flow between the Steam supply pipe and the housing as well as undesirable and dangerous heating under certain circumstances of the housing, since the pipe part heated by live steam carries the heat over the whole Depth of the housing bore can pass into the machine housing practically unhindered.

The invention relates to a further development and improvement of the aforementioned arrangement and exists in that the serving for bracing and sealing, assigned to the steam supply pipe, im Outer housing formed by a ring shoulder with play with respect to the housing over the connection points inwardly guided tube with the also over the connection point to the inside of the housing is connected to the extended end of the steam supply pipe, with between the called pipe ends outside their connection points an annular gap is present.

The arrangement according to the invention has the advantage that the heat path between the steam supply pipe and the ring shoulder that enables the attachment to be considerably increased by one with the Live steam not in contact pipe part is extended, which significantly reduced Heat transfer from the steam supply pipe to the housing results. This also have an effect that between the steam supply pipe and the pipe part producing the connection to the annular shoulder or between the latter and the turbine housing gap favorable in the sense of a Prevention of heat transfer from the steam supply pipe to the turbine housing.

Furthermore, the arrangement according to the invention has the great advantage of increased thermal elasticity Episode.

It should be mentioned that live steam feeds to nozzle boxes located inside the turbines are known, which are formed by rigidly connected to the nozzle boxes pipe socket. At this Arrangement which is welded to seal the housing between the housing and the pipe socket, Provides cone-shaped sealing walls made of different elastic material, but it is not a steam supply connection in the sense of connecting a steam supply line

on a housing, in particular

Turbine housing

Applicant:

Siemens-Schuckertwerke

Aktiengesellschaft,
Berlin and Erlangen,
Erlangen, Werner-von-Siemens-Str. 50

Carl Brennecke, Mülheim / Ruhr-Saarn,
has been named as the inventor

of the invention, in which it is important that the steam supply pipe exclusively on the outer Machine housing is held and clamped. The aforementioned arrangement is therefore with the subject not comparable to the invention.

In the following, the invention will be explained in more detail with reference to an embodiment that is shown in the drawing is reproduced.

1 here means the steam supply pipe provided for the steam supply line, which is at the same time part of a valve body 2. With 3 the outer housing of the turbine is referred to. This is designed as a double-shell turbine. The inner housing or a guide vane carrier is indicated by 4, in which a nozzle holder 5 separated from the steam supply pipe is inserted. Elastic sealing rings are inserted between the nozzle holder 5 and the steam supply pipe. The feed pipe 1 is clamped tightly within an annular groove 9 of the housing 3 by means of an annular shoulder 6. Both the annular shoulder and the annular groove are provided with conical seating surfaces 16. The annular shoulder 6 is connected to the end of the steam supply pipe 1 also passed through the housing by means of a pipe part 6 a guided through the inner bore 17 of the housing 3.

To facilitate manufacture, the annular shoulder 6 and the pipe part 6 α can be designed as a separate part which is screwed onto the end of the steam supply pipe 1 by means of thread 7

. ' 909 557/107

is and subsequently connected to the latter by a seal weld at la . A clamping nut 14, which is screwed into the thread 15 of the outer housing bore, is used to tighten the annular shoulder 6 on the conical sealing surfaces 16. In addition, for sealing between the annular shoulder 6 and the Housing 3 still has an annular lip weld 10, which enables a completely tight seal and is relieved of mechanical stresses by the nut 14.

As the drawing reveals, on the one hand between the pipe part 6 a and the steam supply pipe 1, on the other hand between the pipe body 6 a and the turbine housing 3 column 11 and 12 are switched on, which contribute significantly to the fact that the heat transfer 1 from the steam supply pipe 1 to the Housing 3 remains small and only the relatively limited cross section of the pipe part 6 a and the sealing surface 11 is considered for the direct heat transfer. A heat transfer between the pipe part 6 a and the housing part can be prevented particularly effectively by a screen 13 in the gap 12 between the housing and the pipe part 6 α . Likewise, in the gap 11 surrounding the tubular body 1 between the tubular body 1 and tubular part 6 α and nut 14, the heat transfer from the tubular body 1 to the machine housing 13 can be reduced by switching on a cooling coil 18.

It can be seen that the arrangement according to the invention even with different thermal expansions of the housing 3 and the attached pipe connection must show a favorable behavior.

In order to avoid axial forces on the welding lip in the event of any thermal expansion, the conical Sealing surface 16 designed with such an inclination that the generatrix the plane of the support surface the nut 14 on the ring shoulder 6 intersects in the central axis. There is now a thermal expansion a, which is present simultaneously in the radial and axial directions, it follows that as a result of the corresponding Force decomposition no axial component of the thrust occurs in the sealing weld seam.

Claims (5)

Patent claims: 1. Connection of a steam supply line to a housing, in particular a turbine housing, in which a with the supply pipe connected to the annular shoulder clamped from the outside in the housing and sealed is, characterized in that the supply pipe associated with the outer housing formed ring shoulder by a with play against the housing over the connection point inwardly guided tube with the also over the connection point to the interior of the Housing is connected to the extended end of the steam supply pipe, with between the named pipe ends outside their junction an annular gap is present. 2. Connection according to claim 1, characterized in that the extended over the connection point End of the steam supply pipe with the pipe section carrying the annular shoulder through a Screw connection is connected and the seal is made by a weld. 3. Connection according to claim 1, characterized in that the for clamping the ring shoulder serving nut encloses the steam supply pipe with an annular gap to which the annular gap between the two connected pipe ends, which are connected to the annular shoulder are connected. 4. Device according to claim 1, characterized in that the second tubular body with a conical approach is provided with which it is against an annular shoulder in the outer housing lays, the inclination of this conical surface is so * that its extension is the plane of the supporting surface the nut cuts on the central axis. 5. Device according to claim 1, characterized in that in the space between a heat-shielding cylinder is inserted into the second pipe section and the housing bore. Considered publications:
German Patent Nos. 564 761, 830 056;
U.S. Patent No. 2,527,446. 1 sheet of drawings © 909 557/107 6.59