DE102013205880B4 - sealing arrangement - Google Patents

Abstract

Sealing arrangement of a rotary joint, in particular for a turbomachine, which has at least a first and a second sealing surface (12,13) which sealingly abut each other and can rotate relative to each other, wherein the first sealing surface (13) on a sealing body (3) is arranged , which is held by at least one seal carrier (4), and wherein at least one spring element (5) is provided, which on the one hand against a stop (6) and on the other hand against the sealing body (3) and / or the seal carrier (4) abuts the sealing body (3) with the first sealing surface (13) to press against the second sealing surface (12), wherein the seal carrier (4) and / or the sealing body (3) with one end of the spring element (5) and / or the stop ( 6) are materially connected to another end of the spring element (5), characterized in that the spring element (5) has a guide body (7) along which the spring expands and cont can be ranked.

Description

BACKGROUND OF THE INVENTION

FIELD OF THE INVENTION

The present invention relates to a sealing arrangement of a rotary joint, in particular for a turbomachine, such as a stationary gas turbine or an aircraft engine, according to the preamble of claim 1, as in the document DE 201 07 960 U1 is disclosed.

STATE OF THE ART

In the publication DE 296 01 428 U1 discloses a mechanical seal, which has a bellows as a spring element.

In turbomachines, such as stationary gas turbines or aircraft engines, rotors rotate relative to fixed stators. Accordingly, there are many areas of turbomachine in which rotating components must be sealed against static components, such as in the bearing of the rotors, the bearing chambers must be sealed against leaking oil.

For this purpose, it is known from the prior art to provide so-called carbon face seals, in which a sealing body (referred to as carbon) seals with its sealing surface against a counter-sealing surface, wherein the sealing body (carbon) is arranged to rotate. In order to be able to compensate for axial movements or thermal expansions, the sealing body must also be movable in the axial direction, ie in a longitudinal direction of the rotary shaft, in order to maintain a secure, firm and constant contact with the stationary counter-sealing surface. Accordingly, it is known to provide a corresponding seal arrangement, which makes it possible to bias the sealing body in the axial direction against the sealing surface of the stationary component. Such a known sealing arrangement is in 4 shown in a partial sectional view, which represents only one half of a longitudinal section.

According to the known sealing arrangement, which in a similar way in the EP 0 112 269 A2 is described is a sealing body 3 with its sealing surface 13 against the sealing surface 12 a stationary component 2 pressed. This is done by the spring force of a coil spring 5 causes, between an axially movable Zustellring 11 and a stop element 6 is arranged, wherein the stop element 6 rotationally fixed and fixed in the axial direction with the shaft 1 connected is. In addition, for radial stabilization, a seal carrier 4 arranged, the annular ring-shaped sealing body 3 surrounds. Between the likewise annular stop element 6 and the annular seal carrier 4 are distributed over the circumference of seal carrier 4 and stop element 6 the spring elements 5 arranged on corresponding guide rods, which also for guiding the Zustellrings 11 serve, wherein in a flange-like approach of the Zustellrings 11 corresponding openings are provided for the passage of the guide rods. With an axial displacement of the shaft 1 with respect to the stationary component 2 the sealing effect is maintained, since the sealing body 3 over the springs 5 is biased in the direction of the stationary component.

Due to the large number of different components, however, the assembly effort for a corresponding sealing arrangement is very high and there is the risk that corresponding components are lost or incorrectly mounted. In addition, results from the large number of individual components that must have a minimum size for a suitable handling a lot of space.

DISCLOSURE OF THE INVENTION

OBJECT OF THE INVENTION

It is therefore an object of the present invention to provide a sealing arrangement which eliminates or reduces the problems described above and in particular allows a quick, easy and secure installation of a seal assembly in a turbomachine.

TECHNICAL SOLUTION

This object is achieved by a sealing arrangement with the features of claim 1. Advantageous embodiments are the subject of the dependent claims.

The seal assembly may be at least partially manufactured by a generative manufacturing process in which the component is built up in layers from powder materials. Examples include selective laser melting (SLM), selective laser sintering, selective electron beam melting, selective electron beam sintering or cold gas spraying, and selective hardfacing. Overall, in the generative manufacturing process, a distinction can be made between processes in which powder is selectively added to a structure in a powder bed and processes in which the powder is selectively applied only in those areas which contribute to the formation of the desired structure. All such methods can be used in the present invention.

By generatively producing at least a part of a seal arrangement, the number of components can be reduced, so that errors in the assembly of the individual components are avoided and the entire seal arrangement can be formed with smaller dimensions.

In a sealing arrangement according to the invention in which a sealing body with a first sealing surface seals against a second sealing surface and the first sealing surface and the second sealing surface are movable relative to one another, a seal carrier is provided which holds the sealing body. In addition, at least one spring element is arranged, which on the one hand abuts against a stop and on the other hand against the sealing body and / or the at least one seal carrier to press the sealing body or the seal carrier with the sealing body having the first sealing surface against the second sealing surface. In such a structure, it is proposed to materially connect the seal carrier and / or the sealing body with one end of the spring element and / or the stop from another end of the spring element, so that at least partially generative production, the spring element at least with one of the components, ie for example, the seal carrier or the stopper is integrally formed. In this way, at least two independent structural components, namely on the one hand the seal carrier and the spring element or on the other hand, the stop and the spring element, a single component can be made. Furthermore, according to the invention, the at least one spring element or each spring element has a guide body, along which the spring element can be expanded and contracted.

Preferably, however, several components of the seal assembly can be integrally manufactured in a generative manufacturing process, so that the number of components can be further reduced.

Such a guide body, for example in the form of a guide rod or pin can be materially connected to an end member and / or with the seal carrier and thus produced together with this component generatively.

The guide body may extend through an opening of the stop element, wherein by the connection of the spring element with the seal carrier and the connection of the guide body with the seal carrier and the connection of the spring element with the stop element, an assembly of a seal carrier, a spring element and the associated guide body with end element and a stop element can be formed, which can be produced generatively in total. Such an assembly can be rotatably connected to a shaft, for example via the stop element, wherein only the sealing body still has to be arranged on the seal carrier in order to finish the part of the seal arrangement rotating with the shaft. The sealing body can be held in a form-fitting manner with respect to at least one degree of freedom of movement of the seal carrier.

The spring element may be formed by a leaf spring, a coil spring, a coil spring, a cellular structure, an auxetic structure and / or an elastic element.

The various components of a generativ manufactured assembly, such as seal carrier, guide body, spring element or stop element can be made of different materials to meet the different requirements.

list of figures

• 1 eine Schnittansicht einer ersten Ausführungsform einer erfindungsgemäßen Dichtungsanordnung;
• 2 die Dichtungsanordnung aus 1 in einem Betriebszustand mit gespannter Feder;
• 3 eine Schnittansicht einer zweiten Ausführungsform einer erfindungsgemäßen Dichtungsanordnung; und in
• 4 eine Schnittansicht einer bekannten Dichtungsanordnung nach dem Stand der Technik.

The accompanying drawings show in a purely schematic manner in FIG

• 1 a sectional view of a first embodiment of a seal assembly according to the invention;
• 2 the seal arrangement 1 in a tensioned spring operating condition;
• 3 a sectional view of a second embodiment of a seal assembly according to the invention; and in
• 4 a sectional view of a known seal assembly according to the prior art.

EMBODIMENTS

Further advantages, characteristics and features of the present invention will become apparent in the following detailed description of the embodiments, wherein the invention is not limited to these embodiments.

The 1 shows a seal assembly which is comparable in its basic structure to a seal assembly of the prior art, as for example in 4 is shown. One with a wave 1 rotating sealing body or sealing body 3 seals with its sealing surface 13 opposite a stationary sealing surface 12 a fixed component 2 from. The sealing body 3 is from a seal carrier 4 held on the shaft, as well as the sealing body 3 is arranged annularly around the shaft, wherein in the representations of 1 to 4 only a part of a sectional view is shown and thus the other sectional surfaces of the annular Body are omitted below the dashed mirror plane.

The sealing body 3 can in the embodiment shown the 1 only positive fit on the shaft 1 be held, with a radial and an axial movement in a direction away from the fixed component 2 is prevented by the seal carrier, while in a direction to the stationary component 2 a certain mobility of the sealing body 3 can be given.

At the annular seal carrier 4 are distributed over the circumference of several guide body 7 arranged in the form of guide rods, which provide a guide for around the guide body 7 arranged coil springs 5 provide.

Each of the leaders 7 along the circumference of the annular seal carrier 4 are arranged, is through an associated opening of a likewise annular stop member 6 guided, which in the form of a flange against rotation with the shaft 1 connected is. At the end of each management staff 7 is an end element 9 provided, which is not through the opening of the stop 6 can be performed so that the end element 9 a limitation on the movement of the management staff 7 through the opening of the stop element 6 forms. Accordingly, the seal carrier 4 in the axial direction, that is in the direction of the longitudinal axis of the shaft 1 , on the one hand until it stops against the stop element 6 and in the other direction until it stops the end element 9 on the stop element 6 move.

The around the management staffs 7 arranged coil springs 5 clamp the seal carrier 4 in the direction of the stationary component 2 before, so the sealing surface 13 of the sealing body 3 at the sealing surface 12 of the stationary component is applied.

Will the rotor and thus the shaft 1 in the direction of the stationary component 2 moves, like the arrow in 2 indicates, the coil spring 5 compressed and by the spring force with which the screw 5 the seal carrier 4 in the direction of the stationary component 2 presses, becomes the sealing body 3 with its sealing surface 13 against the sealing surface 12 of the stationary component pressed. Thus, axial tolerances or axial movements can be compensated and the sealing effect can be maintained.

In the sealing arrangement according to the invention, at least parts of the sealing arrangement are produced by a generative method, so that the number of components can be reduced and the installation effort is thus reduced. At the same time many sources of incorrect assembly of the components can be excluded. In the embodiment shown, for example, the seal carrier 4 with the guide elements or guide rods 7 and the respective end elements 9 as well as the spring elements 5 and the stop 6 generated by a generative process. Such generative methods are, for example, selective laser beam welding or selective electron beam welding in a powder bed or targeted, three-dimensional buildup welding with targeted feeding of the powder to the corresponding weld. Common to these generative method is that the components are built up in layers, with very complex shapes and different material compositions can be realized. Thus, for example, in a generative structure of the seal carrier 4 , the guide rods 7 , the spring elements 5 , the stop element 6 and the end elements 9 be selected for the different components different materials and it can be the individual components with the different materials in a simple manner cohesively interconnected. For example, the spring element 5 on the one hand with one end to the seal carrier 4 be arranged cohesively and with the other end to the stop element 6 , Accordingly, attachment points or attachment surfaces between the spring elements arise 5 on the one hand and the seal carrier 4 and / or the stop element 6 ,

An alternative embodiment of a sealing arrangement according to the invention is shown in FIG 3 shown. The seal arrangement of 3 again comprises a seal carrier 4 , in the present case integral with the stop element 6 is formed, which rotatably on the shaft (not shown) can be arranged. Thus, there is no axial mobility of the seal carrier 4 with respect to the stop element 6 given and the axial mobility of the sealing body 3 is realized by an axially displaceable Zustellring 11 is provided as a separate part of the seal carrier, similar to the seal arrangement of 4 , The delivery ring 11 is via a spring element 5 , which may be formed in the embodiment shown as an elastic element or as a cellular elastic structure, on the stop element 6 arranged and is located on the sealing body 3 at. By deformation of the spring element 5 can thus the sealing body 3 be moved in the axial direction and it can be an axial compensation with respect to the sealing surface of a fixed component (not shown here).

In the present embodiment of 3 can the seal carrier 4 with the stop element 6 , the spring element 5 and the delivery ring 11 be integrally formed and thus made generative. For mounting on a rotating shaft then only the stop element 6 be rotatably connected to the shaft and the sealing body 3 in the space between shaft and seal carrier 4 be inserted.

Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that the invention is not limited to these embodiments, but rather modifications are possible in the manner that individual features omitted or other combinations of features can be realized as long as the scope of protection of the appended claims is not abandoned.

Claims (8)

Sealing arrangement of a rotary joint, in particular for a turbomachine, which has at least a first and a second sealing surface (12,13) which sealingly abut each other and can rotate relative to each other, wherein the first sealing surface (13) on a sealing body (3) is arranged , which is held by at least one seal carrier (4), and wherein at least one spring element (5) is provided, which on the one hand against a stop (6) and on the other hand against the sealing body (3) and / or the seal carrier (4) abuts the sealing body (3) with the first sealing surface (13) to press against the second sealing surface (12), wherein the seal carrier (4) and / or the sealing body (3) with one end of the spring element (5) and / or the stop ( 6) are materially connected to another end of the spring element (5), characterized in that the spring element (5) has a guide body (7) along which the spring expands and con can be traded. Seal arrangement according to Claim 1 , characterized in that the guide body (7) with an end member (9) and / or with the seal carrier (4) is integrally connected. Sealing arrangement according to one of the preceding claims, characterized in that the sealing body (3) is positively held by the seal carrier (4). Sealing arrangement according to one of the preceding claims, characterized in that two or more, preferably all, materially interconnected components of the sealing arrangement have been produced generatively. Sealing arrangement according to one of the preceding claims, characterized in that the spring element (5) comprises a leaf spring, a coil spring, a coil spring, a cellular structure, an auxetic structure and / or an elastic element. Sealing arrangement according to one of the preceding claims, characterized in that the seal carrier (4) comprises a separate, movable infeed ring (11) or is formed by this. Sealing arrangement according to one of the preceding claims, characterized in that the seal carrier (4) and / or the sealing body (3) together with the spring element (5) and / or the stop (6) are produced generatively together with the spring element (5). Seal arrangement according to Claim 6 , characterized in that the guide body (7) is produced generatively together with an end element (9) and / or together with a seal carrier (4).

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