WO2016000802A1

WO2016000802A1 - Method for producing a predetermined breaking point in a seal arrangement with a centering ring

Info

Publication number: WO2016000802A1
Application number: PCT/EP2015/001038
Authority: WO
Inventors: Alfred Jung
Original assignee: Alfred Jung
Priority date: 2014-06-30
Filing date: 2015-05-21
Publication date: 2016-01-07
Also published as: DE102014009480A1; EP3161356A1

Abstract

The invention relates to a method for producing a predetermined breaking point in a seal arrangement for flat flange connections. The seal arrangement has a preferably metal circular main part (1) which is machined preferably by embossing and/or stamping, has soft material supports (2, 3), preferably made of graphite or PTFE, on both sides, said supports being circumferential in an annular manner, and additionally forms an outer centering ring which is not provided with soft material supports (2, 3). The predetermined breaking point is produced in the region of the centering ring by scribing or cutting a circumferential groove (13, 14) using a chipless cutting blade or a laser beam or by embossing, stamping, or notch-rolling a circumferential groove (13, 14). The groove (13, 14) circulates either only on the upper face or only on the lower face of the centering ring, or both faces of the centering ring are provided with a respective circumferential groove (14), in which case the two grooves (14) are arranged so as to lie opposite other.

Description

Method for producing a predetermined breaking point in a sealing arrangement with centering ring

The invention relates to a method for producing a predetermined breaking point in a sealing arrangement for flat flange according to the preamble of claim 1 and according to the preamble of claim 4. Furthermore, the invention relates to a provided with a predetermined breaking point seal assembly for flat flange.

Various sealing arrangements for flat flange connections are known from the prior art, which have a circular metallic base body, which is provided on both sides with annular circulating soft material supports, such as graphite or PTFE, and also forms an outer centering ring not provided with soft material supports. The purpose of this centering ring part of the seal assembly is to effect a centered position of the seal assembly by placing the outer edge of the centering ring on flange bolts such that the center of the seal assembly coincides with the center of the flange joint. This is necessary so that the seal assembly does not hinder unimpeded flow of a medium to be transported through the flange and piping to it through any radially offset arrangement. The outer centering ring as such is common in the art and allows a very simple centering of the seal assembly during assembly.

Another very important point in the assembly of a seal assembly in a flat flange is that it is essential to tighten the flange evenly and professionally. This is occasionally neglected by fitters. With loose flange bolts due to improper tightening of the flange bolts, it can happen that the flanges are pushed apart due to high internal pressure of the medium flowing in the pipes. As a result, the centering ring behind the soft material supports, caused by the gap on both sides, is caused to oscillate by outflowing medium. These excited by the effluent medium vibrations of the centering ring are so strong that pieces of the centering break out, in projectile Be able to fly out of the flange connection and seriously injure passing or near-by technicians.

In thick Kammprofildichtungen, spiral wound gaskets or similar turned gaskets, it is therefore common in the art either by turning a predetermined breaking groove in the centering ring by means of a cutting lathe or to address a loose centering ring at some points on the metallic body of the seal assembly. This ensures that the centering ring, as soon as it starts to oscillate by any outflowing medium even slightly, completely breaks off. With the canceling of the centering ring, the vibrations are stopped immediately, and a threat to people is then excluded in any case.

The cutting and milling of a predetermined breaking groove in the centering ring as well as the centering of a centering ring are mainly used only in Kammprofildichtungen of predominantly over 2 mm thickness. Therefore, there are predetermined breaking points in the prior art only with turned, milled or wound jacketed seals. Such sealing arrangements of the prior art have installation thicknesses of about 5 mm and can therefore only be installed in correspondingly large Flanschblattspalte. For installation predominantly in narrow flange blade gaps of about 2 mm, punched graphite seals with metal carrier, aramid fiber and corrugated gaskets, etc. are used, where no breakaway groove according to the prior art is available. In the case of the centering ring manufactured separately and then dotted to the sealing body, e.g. Kammprofildichtungen, added that this method is extremely labor intensive and therefore very expensive.

Furthermore, there are already well functioning according to the prior art seal assemblies for installation in narrow Flanschblattspalte, see. for example, the sealing arrangements described in EP 1 062 442 B1 or in EP 1 974 158 B1, but these are embossed and / or stamped sealing arrangements. The main body of these seal assemblies has such a small thickness that eliminates machining.

Nevertheless, in terms of plant safety and plant availability, it is also highly desirable to include the seal arrangements for narrow flange blade gaps with a nominal Equip parts, because even thin flying around centering ring parts can do great damage and endanger people considerably.

The invention is therefore based on the object to provide a method which is suitable for producing a predetermined breaking point, in particular for sealing arrangements for narrow Flanschblattspalte. It is another object of the present invention to provide a seal assembly for flat flange joints made using this method.

The above object is achieved by a method according to claim 1, by a method according to claim 4 and by a sealing arrangement according to claim 7.

Advantageous and preferred embodiments of the inventive method according to claim 1 are the subject of claims 2 and 3. Advantageous and preferred Durchfuhrungsformen of the method according to claim 4 are the subject of claims 5 and 6. Advantageous and preferred embodiments of the sealing arrangement according to claim 7 are the subject of the claims 8 to 10.

Advantageous and preferred embodiments of the invention are explained below with reference to figures. It shows:

1 shows a cross-sectional view of one half of a built-in flange connection embossed seal assembly of the prior art according to EP 1 062 442 Bl without predetermined breaking point,

2 shows a cross-sectional view of one half of a built-in flange connection embossed corrugated ring seal of the prior art without predetermined breaking point,

3 is a cross-sectional view of a half of a rotated thick Kammprofildildichtung with rotated Sollbruchnut from the prior art,

4 is a cross-sectional view of a first embodiment of a sealing arrangement according to the invention,

5 shows a cross-sectional view of a second embodiment of a sealing arrangement according to the invention and

Fig. 6 in plan view, a third embodiment of a seal assembly according to the invention. FIG. 1 shows an embossed sealing arrangement for flat flange connections built into a flange connection, as is known from EP 1 062 442 B 1. This seal arrangement has a metallic base body 1, which is radially partially occupied on both sides with soft material pads 2, 3. The soft material supports 2, 3 may for example consist of graphite or PTFE. They are encapsulated by teeth 4, 5, 6 and 7 in the radial direction.

Fig. 1 is a cross-sectional view of the seal assembly and the flange with its flange leaves 8, 9 and the flange screws, of which in Fig. 1, a flange screw 10 can be seen. In the plan view, both the base body 1 and the soft material supports 2, 3 each have the shape of a circular ring, and the teeth 4, 5, 6 and 7 are circular circumferential ring teeth.

In Fig. 1, the left side, so the pipe side of the flange. That There, the medium to be transported flows. This arrangement also applies to the figures 2 to 5, which are explained below in more detail. On the left is always in the figures 2 to 5 so always the pipe side with the flowing medium, and right is the air atmosphere facing the outside.

Only one is shown in FIGS. 1 to 5, namely the right-hand half of the cross-section of the annular arrangement surrounding the sealing ring. The other half would result in each case by simple reflection of the half shown on the mid-perpendicular of the flange to the left.

In Fig. 1 it can be seen that the base body 1 of the seal assembly in the direction of the outside, in Fig. 1, ie, to the right, forms a centering ring, which rests with a rounded outer end 11 of the flange screw 10.

The seal assembly of FIG. 1 is prior art, is suitable for narrow

Flanschblattspalte, but has no predetermined breaking point.

FIG. 2 shows an embossed corrugated ring seal of the prior art incorporated in a flange connection without predetermined breaking point. The metallic main body 1 has a shaft here form, is partially covered on both sides with soft material pads 2, 3 and forms outwardly fitting to the flange screws, corrugated centering ring.

Fig. 2 is a cross-sectional view of the right half of the embossed corrugated ring seal and the flange with its flange leaves 8, 9 and the flange screws, of which in Fig. 2, a flange screw 10 can be seen. In plan view, both the main body 1 and the soft material supports 2, 3 each have the shape of a circular ring, and the peaks of the main body 1 are circular circumferential peaks. The same applies of course to the troughs.

Fig. 3 also shows prior art and shows in cross-section a rotated thick comb profiled seal for wide Flanschblattspalten with a metallic body 1. This has in its left portion made by turning two-sided comb profile, and in its right portion it forms a flat outer centering ring. In this centering ring, a predetermined breaking groove 12 has been produced by turning by means of a cutting turning tool.

The soft material supports which are also present in the comb profile seal and which cover the two comb profiles have been omitted in the illustration of FIG. 3 for the sake of clarity.

Fig. 3 is a cross-sectional view of the right half of the comb profile seal. In the plan view of the main body 1 has the shape of a circular ring, the ridges of the comb profile are circular circumferential ridges, and the predetermined breaking 12 is a circular circumferential groove.

The rotated Kammprofildichtung shown in Fig. 3 from the prior art with outer centering and breakaway groove 12 has the advantage that the centering ring breaks off at the predetermined breaking 12 before he can get into dangerous vibrations by any medium flowing out and then possibly Zentrierringbruchstücke in a projectile manner shoot out from the flange connection. However, the production of the turned Kammprofildildichtung is extremely expensive and material. In a method according to the invention for producing a predetermined breaking point in a sealing arrangement for flat flange, wherein the sealing arrangement has a preferably metallic and preferably machined by embossing and / or stamping annular main body, the both sides ring encircling Weichstoffaufla- conditions, preferably made of graphite or PTFE, and Furthermore, a not provided with soft material outer centering ring, the predetermined breaking point is created in the region of the centering by scoring or cutting a circumferential groove by means of a chipless cutting blade or laser beam or by embossing, punching or notching a circumferential groove, the groove either on the Top of the centering ring or only on the underside of the centering ring rotates or both sides of the centering ring are each provided with a circumferential groove, in which case the two grooves arranged so are that they are facing each other.

The particular advantage of this method according to the invention is that it can be applied to very thin body seal assemblies, e.g. in sealing arrangements with a base consisting of a sheet having a thickness of at least 0.1 mm but less than 1.5 mm, preferably less than 1.0 mm. Particularly preferred such sealing arrangements have in the original state prior to installation only a total thickness of less than 2.2 mm, preferably even less than 1, 7 mm, and are therefore suitable for installation in narrow Flanschblattspalte of less than 5 mm wide and even only 2 mm wide excellent.

Fig. 4 shows schematically a first embodiment of a seal assembly according to the invention, which was provided by means of a method according to the invention with a circumferential predetermined breaking groove in the region of the centering ring. Unlike in the case of the corrugated gasket of FIG. 2, however, in the exemplary embodiment of FIG. 4, a predetermined breaking groove 13 was incised in the underside of the centering ring by means of a non-cutting cutting blade.

If you were to rotate the representation of the seal assembly of Fig. 4 about its longitudinal axis by 180 °, then the breakaway groove 13 would of course be located on top of the centering ring. Fig. 4 is a cross-sectional view of the right half of the embossed corrugated ring seal according to the invention. In the plan view, both the base body 1 and the soft tissue supports 2, 3 each have the shape of a circular ring, and the wave crests of the base body 1 are circular, surrounding wave crests. The scored in the centering ring breaking groove 13 is a circular circumferential groove.

According to the invention it is also possible to introduce the aforementioned predetermined breaking groove 13 by cutting by means of laser beam or by embossing, punching or notching.

Fig. 5 shows schematically a second embodiment of a seal assembly according to the invention, which has been provided by means of a method according to the invention with two opposing circumferential Sollbruchnuten 14 in the region of the centering ring. Unlike in the case of the sealing arrangement of FIG. 1, in the embodiment of FIG. 5, however, the centering ring was not cut into the centering ring either on its upper side or on its underside by means of a chipless Cutting knife each scratched a predetermined breaking groove 14, wherein the two predetermined breaking grooves 14 are arranged opposite each other.

Fig. 5 is a cross-sectional view of the right half of this seal assembly according to the invention. In plan view, both the base body 1 and the soft material supports 2, 3 each have the shape of a circular ring, and the teeth of the base body 1 are circular circumferential ring teeth. The two scored in the centering Sollbruchnuten 14 are circular circumferential grooves 14th

According to the invention, it is also possible to introduce the abovementioned predetermined breaking grooves 14 by cutting by means of a laser beam or by embossing, punching or notching rolls.

The two Sollbruchnuten 14 according to the embodiment of FIG. 5 can be scratched or cut, for example, simultaneously by two opposing cutting blade. If the Kerbwalzverfahren is used, the two Sollbruchnuten 14 can also be rolled simultaneously by two opposing notching rollers.

The same applies to the stamping, embossing or laser beam cutting of the two predetermined breaking grooves 14.

Quite generally, it is particularly advantageous in the above-explained method according to the invention, the Sollbruchnut 13 or the two opposite Sollbruchnuten 14 to be arranged so that in the event of a break as large a part of the centering separates from the seal assembly. The predetermined breaking groove 13 or the predetermined breaking grooves 14 is or are therefore preferably mounted as close as possible to the region of the sealing arrangement covered by the soft material supports 2, 3.

Thus, in one embodiment of the method according to the invention, the groove 13 or the two opposing grooves 14 are mounted so that it is at least twice as far away from the outer edge of the centering ring as are from in the direction of groove 13 or grooves 14 facing outer edge of the soft material pads 2, 3.

In another embodiment of the method according to the invention, the groove 13 or the two opposing grooves 14 are mounted so that it is at least four times as far away from the outer edge of the centering ring as are from in the direction of groove 13 or grooves 14 facing outer edge of the soft material supports 2, 3.

In a further inventive method for producing a predetermined breaking point in a seal assembly for flat flange, wherein the seal assembly has a preferably metallic and preferably machined by stamping and / or punching annular base body, the circular side circular annular soft material supports, preferably made of graphite or PTFE, and further forms a centering ring not provided with soft material supports, is made by means of laser beam and / or by punching in the region of the centering a narrow slot extending in the circumferential direction, at least two locations, preferably at four offset by 90 ° to each other points, extending in the radial direction narrow break-off webs is interrupted. This further inventive method can be applied in a particularly advantageous manner for sealing arrangements with a very thin body, such as in seal assemblies with a body consisting of a sheet having a thickness of at least 0.1 mm, but less than 1.5 mm, preferably less than 0.8 mm. Particularly preferred such sealing arrangements have in the original state prior to installation only a total thickness of less than 2.2 mm, preferably even less than 1, 7 mm, and are therefore suitable for installation in narrow Flanschblattspalte of less than 5 mm wide and even only 2 mm wide excellent.

FIG. 6 shows in plan view an exemplary embodiment of an embossed sealing arrangement for narrow flange blade gaps produced by this further inventive method. In the metallic base body 1, a circumferentially extending narrow slot 15 was introduced in the region of the located outside of the soft material supports 2 by means of laser beam cutting, which in the embodiment shown in Fig. 6 at four offset by 90 ° to each other by points in the radial direction narrow Breakaway webs 16 is interrupted.

Instead of four breakaway webs 16, only three or two breakaway webs 16 and in other embodiments, more than four breakaway webs 16 may be provided in other embodiments.

Instead of introducing the slot 15 by means of laser beam cutting, in other embodiments the slot 15 can also be produced by punching.

Quite generally, it is advantageous to arrange the slot 15 with the predetermined breaking webs 16 such that, in the event of a break, the largest possible part of the centering ring separates from the sealing arrangement. The slot 15 is therefore preferably mounted as close as possible to the region of the seal arrangement covered with the soft material supports 2.

Thus, in one embodiment of the method according to the invention, the slot 15 is mounted so that it is at least twice as far away from the outer edge of the centering ring as from the outer edge of the soft material layers 2 pointing in the direction of the slot 15. In another embodiment of the method according to the invention, the slot 15 is mounted so that it is at least four times as far away from the outer edge of the centering ring as facing away from the slot 15 outer edge of the soft material layers. 2

In a preferred embodiment of a seal assembly according to the invention with the interrupted by narrow breaking ridges 16 narrow, circumferentially circumferential slot 15, the slot 15 has a width of 0.8 mm, and the predetermined breaking webs 16 each have a width of 0.4 mm. There are in this particular embodiment, four offset by 90 ° arranged predetermined breaking webs 16 are present. In another, the embodiment described above otherwise the same embodiment of a seal assembly according to the invention, only three such predetermined breaking webs 16 are provided, which are arranged offset by 120 °.

Claims

claims

1. A method for producing a predetermined breaking point in a sealing arrangement for flat flange, wherein the sealing arrangement has a preferably metallic and preferably machined by embossing and / or stamping kreisringförmi- gen base body (1), the

on both sides circular annular surrounding soft material supports (2, 3), preferably made of graphite or PTFE, and

furthermore forms an outer centering ring not provided with soft material supports (2, 3),

characterized in that

the predetermined breaking point is created in the region of the centering ring

by scratching or cutting a circumferential groove (13, 14) by means of a chipless cutting blade or by means of laser beam or

by embossing, punching or notching rollers of a circumferential groove (13, 14), wherein the groove (13, 14)

either only on the top of the centering or only on the underside of the centering ring rotates or

both the top and the bottom of the centering ring are each provided with a circumferential groove (14), in which case the two grooves (14) are arranged so that they face each other.

2. The method according to claim 1, characterized in that the groove (13) or the two opposing grooves (14) is mounted so or are that it is at least twice as far away from the outer edge of the centering or are as from in the direction of the groove (13) or grooves (14) facing outer edge of the soft material pads (2, 3).

3. The method according to claim 2, characterized in that the groove (13) or the two opposing grooves (14) is mounted or be so that it is at least four times as far away from the outer edge of the centering or are as from in the direction of the groove (13) or grooves (14) facing outer edge of the soft material pads (2, 3).

4. A method for producing a predetermined breaking point in a seal assembly for flat flange, wherein the seal assembly has a preferably metallic and preferably machined by stamping and / or stamping annular main body (1), the

characterized in that

by means of laser beam and / or by means of punching in the region of the centering ring, a slot (15) running in the circumferential direction is produced, which extends at at least two points, preferably at four points offset by 90 ° from each other, by webs (16) extending in the radial direction. is interrupted.

5. The method according to claim 4, characterized in that the slot (15) is mounted so that it is at least twice as far away from the outer edge of the centering ring as in the direction of slot (15) facing outer edge of the soft material pads (2, 3 ).

6. The method according to claim 5, characterized in that the slot (15) is mounted so that it is at least four times as far away from the outer edge of the centering ring as in the direction of the slot (15) facing outer edge of the soft material supports (2, 3 ).

7. Sealing arrangement for a flat flange connection, characterized by a predetermined breaking point produced by a method according to one of the preceding claims.

8. Sealing arrangement according to claim 7, characterized in that the base body (1) consists of a sheet having a thickness of at least 0.1 mm, but less than 1.5 mm, preferably less than 1.0 mm.

9. Sealing arrangement according to claim 7 or claim 8, characterized in that the seal assembly in the original state prior to installation has only a total thickness of less than 2.2 mm, preferably less than 1, 7 mm.

10. Sealing arrangement according to one of claims 7 to 9, characterized in that it has in both soft material pads (2, 3) covered area as well as in not covered with soft material pads (2, 3) area surrounding ring teeth and shafts or flat.