DE9117206U1 - Lamella and expander seal centering combination - Google Patents

Description

Josef Fey · ·' · · ,»*

Lamellar rings

86343 Koenigsbrunn

Laraellen and expander seal centering combination

The invention relates to a lamella and expander seal centering combination for exhaust pipe systems, in which a pipe connection piece designed as a bell
the other pipe connector with a ring carrier seal set
surrounds.

In exhaust pipe systems of combustion engines, compressors or similar, the pipes are often made of several parts so that the high, frequent exhaust

The axial expansions and contractions that occur during heating and cooling do not cause such stresses on these systems that would cause the pipe connections to be destroyed, especially at the welds and also at the supports. These stresses are also caused by the

the continuous vibrations emanating from the piston engines or compressors are increased considerably, with particular load peaks occurring when the machines are running, such as when high performance is required and in their critical speed ranges. Such axial

Pipe connectors that allow for displacement and have radial play as well as seal the gases are also called bell or tulip connections
called.

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Known solutions of this type use two so-called stabilizing double-lamella rings next to each other for gas sealing in the plug connections, the end areas of which are bent inwards in such a way that their inner contact surfaces are much closer to the groove bases, although there must still be some play so that these ring parts do not get stuck in the grooves under dry operating conditions with high temperatures and large vibrations, which would be further promoted by the fact that the contact surfaces of the bent ring parts in the groove bases are relatively small, meaning that high surface pressure values are present.

The radial play of the inwardly bent ring sections that exists under the described harsh operating conditions therefore causes a radial deflection of the two sections of the pipe plug connection relative to each other, albeit a small one, whereby these deflections assume higher values due to the elasticity and only limited load-bearing capacity of these rings in conjunction with the strong vibrations.

Another disadvantage is that these two stabilized lamella rings are not always installed in such a way that the joint areas at the ends are offset by 180° or can twist during operation so that the initially opposite position no longer exists and this results in an eccentric position of both pipe parts, the inner ring carrier to the bell bore, which also causes noise and, in the long term, damage.

These parts collide, which leads to greater abrasion on the surrounding bell, which means that this seal becomes increasingly leaky and must therefore be replaced early. The sealing effect is also reduced anyway by the bent ends and thus the reduced contact with the outer cylinder surface in the joint area, which is further increased by an eccentric position of the parts.

According to other known proposals, these problems should be eliminated by inserting flexible and axially flexible metal wound hoses into the exhaust pipe. However, such hoses are expensive and their service life is relatively short, as cracks often occur due to the vibrations - especially at the connection points. Such metal wound hoses also do not allow for larger bends and are therefore not suitable for short installations - especially with larger lateral offsets of the inlets and outlets.

The object of the invention is to create a pipe plug connection of this type which has a low purchase price, guarantees a high number of operating hours, does not cause rattling noises and also does not cause high wear and tear and thus damage, allows foolproof assembly with highly effective sealing conditions, which can also be used in the case of a strong lateral offset of the inlet and outlet to one another and in particular in the case of short installation spaces.

This object is achieved according to the invention in that at least two grooves are provided next to one another in a ring carrier, into which two externally clamping double lamella rings or an expander ring are inserted.

Further features of the invention are characterized by the patent claims.

The advantages achieved with the invention are in particular that with axially movable pipe plug connections for exhaust pipes of the type described, which are exposed to high loads and temperature fluctuations, a highly effective seal is always guaranteed with a long service life and noise-free operation, and the nested halves of the pipe connections always assume a central position with respect to one another with sufficient radial play of the seals, whereby no significant wear occurs and the vibration influences are dampened. The sealing and vibration-absorbing effect can be easily adjusted as required by using several identical lamellas or expander rings. All of this is achieved with a relatively inexpensive design of the plug connections, which also enable short installation spaces and/or strong lateral offset of the inlets and outlets.

The drawing shows embodiments of the invention, showing

Fig. 1 is a sectional view through the subject matter of the invention,

Fig. 2 shows a detail Z according to Fig. 1, on an enlarged scale,

Fig. 3 is a sectional view along the line AB in Fig. 1, in which the wall thicknesses are thickened to clarify the illustration,
5

Fig. 4 a relatively short version of a double plug connection with a strong lateral offset of the inlets and outlets, equipped with multiple lamella ring sets, 10

Fig. 5 shows a detail Y according to Fig. 4 on an enlarged scale.

In a lamella and expander centering ring combination 1 according to Fig. 1 and 2, the gas-discharging pipe 2 has a bell 3 as a pipe connection piece at its end, which is formed by expanding the same, the outer part being provided with an expanding cone area 4 to enable easy insertion during assembly.

A ring carrier 6 is firmly arranged on the pipe connection piece of the second pipe 5, which is inserted into the bell area and leads the gas. The ring carrier 6 is provided with a groove 7 at the front to accommodate two double-lamella rings 8 and then with a second groove 9 to accommodate a so-called expander ring 10. The double-lamella rings 8 are made of tempered, heat-resistant material, as is the open expander ring 10, which is polygonal, e.g. nine-fold, and with its outer edge areas 12 rests on an inner cylinder surface 13 of the bell 3 and with its intermediate areas 14 tangentially on the base surface 16 of the groove 9. The latter is under such spring tension that the two

Pipes 2 and 5 only swing very slightly against each other under the vibrations that occur, for example due to the piston engine operation, without hitting each other, whereby the bending stresses that occur in the expander ring 10 are within the permissible values. This always achieves both a centering of the two pipe parts relative to each other and a dampening of the vibration influences in this plug connection due to the friction that occurs.

Friction conditions that cause little abrasion are favored by the fact that the edges 17 and 20 of the double-lamella rings 8 and the expander ring 10 are rounded or chamfered and the two ends of the double-lamella rings are geometrically shaped in the same way as their other parts.

The inlet and outlet of the cranked pipe section 18 according to Fig. 4 is offset laterally by the dimension 19, whereby it is connected, for example, to a turbocharger 20.

To increase the sealing effect, for example when higher gas pressures are present, and also to control stronger vibrations, various combinations of lamellar and expander rings are used. For example, three grooves are provided in a ring carrier 21, two grooves 7 for two double lamellar rings 8 and between them a groove 9 for an expander ring 10.

In a ring carrier 23 of a supply pipe 24, see also Fig. 5, two grooves 25 are designed in such a way that they each have an externally clamping double-35

Lamellar ring 8 and between these an internally tensioning double lamellar ring 2 6, whereby the gas seal is increased even further. Between these two lamellar ring seals an expander ring 10 is inserted in a groove 25, but it can also be done in such a way that the expander ring 10 is arranged behind the two lamellar ring seals, regardless of their configuration, whereby to further increase the sealing effect, instead of the double lamellar rings 8, two double lamellar rings 8 can also be used next to each other in corresponding grooves of corresponding ring carriers.

For extremely high sealing requirements, three externally clamping double lamella rings 8 or 26 can also be considered per groove, as not shown, and one internally clamping double lamella ring between each of them.

Likewise, within the scope of the invention, two or three expander rings 10 can be combined with the double lamellar rings 8 or 26 for each sealing and guide set, if, for example, very strong vibration influences have to be absorbed. This means that the individual expander rings 10 can also be designed to be more elastic and thus softer, which results in lower surface pressures on the systems and allows easier assembly, since the forces occurring per ring are smaller.

The tube 24 is designed to be angled in front of the plug connection through its area 27, which shows that it can take on any desired shape, such as a straight tube design shown in dash-dotted lines 28, which makes it clear that with the inventive design of the combined lamella-expander ring design, the often angled and narrow

Space conditions in the engine or compressor compartment can be largely taken into account, in contrast to the metal wound hoses mentioned, which refers in particular to the lateral offset, dimension 19, of the gas supply and discharge pipes. The invention can also be used in the case of frequently used thicker-walled connecting pipes or exhaust manifolds, which are usually manufactured as cast parts.

Claims (3)

Josef Fey Lamellenringe 8634-3" Königsbrünn Lamellen- and Expander-Seal-Centering Combination Protection Claims 1. Lamellar and expander seal centering combination for exhaust pipe systems, in which a pipe connection piece designed as a bell surrounds the other pipe connection piece with a ring carrier seal set, characterized in that at least two grooves (7, 9) are provided next to one another in a ring carrier (6, 21, 23), into which two externally clamping double lamellar rings (8) or an expander ring (10) are inserted. 10 2. Lamellar and expander seal centering combination according to claim 1, characterized in that in ring carriers (21) in grooves (7) two externally spanning double lamella rings (8) are provided between an expander ring (10) in a groove (9) or next to one another in front of the latter. 3. Lamellar and expander seal centering combination according to claim 1, characterized in that either in a ring carrier (23) in a groove (25) two or three externally clamping double lamella rings (8) and between these one or two internally clamping double lamella rings [26] and adjacent to the side remote from the gas one or two expander rings (10) in grooves (9) or that further adjacent to the latter only externally or externally and internally clamping double lamella rings (8, 26) are provided.