DE4114579A1 - Clamping ring for elastomeric sealing ring in pipe - consists of expander ring with overlapping ends - Google Patents

Abstract

The clamping ring for fixing an elastomeric sealing ring in a pipe sleeve consists of a divided expander ring (1), the ends (2,2') of which overlap (5) when in position. The expander ring (1) ends (2,2') are fixed together by means of teeth (4), cams, cavities, frictional surafces and such like, or by adhesion or welding. The two overlapping expander-ring ends (2,2') interlock on their radial outer periphery or abut leaving a radially outer gap between their ends, bridged by a thin-walled, guide-sleeve. A connecting-wire or strip is inserted into the pipe's holloe duct. ADVANTAGE - The sealing inserted between the sleeve and the elastomeric sealing ring it contains requires only relatively low radial forces to be applied to the clamping ring for the sealing ring to be deformed near the clamping ring.

Description

The invention relates to a clamping ring with which an elas tomer sealing ring in the sleeve of a pipe is increasing.

So that in the sleeve of a pipe, for example one Stoneware pipe, inserted elastic sealing ring not when retracting the tip end of the next pipe in one prevent the sealing of the socket connection the way is pushed up to the socket level, ver one applies fasteners that the sealing ring in its functional operational position at the beginning or fix approximately in the middle of the sleeve. As Be fixings for the sealing ring are used - mostly consisting of hardening synthetic resins - adhesive or ver casting compounds, but their use is relatively large apparatus (storage, mixing, pouring, etc.) and work intensive production effort required. Considerable Ra tionalization opportunities arise from the fact that instead of adhesive or casting compounds, clamping rings for Get involved. To ent when manufacturing the pipes existing radial diameter tolerances of the sleeves at the same time, these clamping rings are usually as with Mount on the different inside diameters water adjustable spreader rings.

As far as these expansion rings radially on the outside of their joint the spreading ring ends the circular shape of the outer surface have an interrupting gap results in the gap a leak at the sealing ring, which the tightness of the entire socket connection is endangered (DE-OS 27 43 238, DE-PS 27 54 982).  

Spreading rings are also known which have this disadvantage not have (DE-PS 23 53 184, NL-OS 81 02 199, DE-PS 32 16 682). Such expansion rings consist of Injection molding plastic rings (from PP, PVC or the like). Because their cross-sectional shape - above all in the overlap area of the two spread ring ends - right is relatively complicated, are to her fro position accordingly expensive injection molding tools what the manufacture of this plastic Expander rings considerably more expensive.

These disadvantages can be overcome by using a made of thick steel wire undivided Avoid expansion ring, the radial diameter of which is the operating position over the elastic limit of Steel wire is enlarged (DE-PS 32 47 452). These Mecha increases the diameter of the steel wire niche by cold stretching the already in the sleeve located expansion ring. He is for this stretch considerable radial press forces are required, because in addition to the Forces to achieve the sealing necessary Deformation of the between the expansion ring and the sleeves inner wall portion of the elastomeric you tion ring must the steel of the expansion ring through large Radial forces are stretched so much that the spread ring in its operating position after the material elastic shrinkage still required the for the Ab Sealing and fixing of the sealing ring required che diameter enlargement. From constructi ven and for cost reasons, the diameter of the sleeve fen so small that between the outside man tel of the unexpanded expansion ring and the inner surface the sleeve is only a very small one, starting from the sealing ring filled space of a few millimeters (e.g. from 3-4 mm). Within this space plays when mounting the sealing ring and the Spreader ring which broke out of those on the spreader ring  Radial forces caused deformation of the sealing ring ges and that due to the elastic shrinkage he required oversized diameter increase of the expansion ring. It is obvious that with such small radial assembly gaps and such large radial forces when stretching the steel wire muf do not let blasting be avoided. Mean especially those sleeve explosions pose a danger to the durability of the future pipeline where the sleeve a barely recognizable crack - a so-called ten hairline crack - which is usually only under the effect of the earth's load or the impact stress by traffic loads to the final break of the Sleeve of the pipe already installed in the pipeline leads.

The invention has for its object a clamp ring for attaching an elastomeric sealing ring to create in the sleeve of a pipe that at simple The most cross-sectional formation is an all-round uninterrupted one Seal between the sleeve and the inside guaranteed elastomeric sealing ring, and at its Assembly essentially only the relatively small radial forces need to be applied to the clamping ring, to achieve the functionally necessary deformation of the sealing ring in the area of the clamping ring are such.

This task is accomplished according to the invention by the union solved the following features:

• a) the clamping ring is designed as a split expansion ring det,
• b) the expansion ring consists of an originally continued continuously of the same cross-section, in extrusion, rolling, Pull or in a similar continuous Strand production process manufactured, suitable  cut to length and shaped into an unconnected ring strand of material (steel wire, steel or plastic rod or rod, steel or plastic tubes or similar),
• c) the expansion ring also instructs in the operating position its spreading ring ends on an overlap section,
• d) on a tangential longitudinal area on both Spreading ring arranged locking device is only by non-cutting and / or cutting input or Deforming the original also on the spread wrestling material of the same cross-section strand manufactured,
• e) existing in the operating position of the expansion ring dene, was done by means of the locking device potential definition of be in the overlap section sensitive spreader is through in mutual Meshed teeth, cams and recesses, Friction surfaces or the like and / or by gluing or welding the overlapping expansion ring ends causes
• f) at the latest in the operating position of the expansion ring go the two overlapping expanding ring end at their radial outer circumference also at the joint seamlessly one above the other, or one between the two the radially outer joint located on the expanding ring ends is by a - preferably thin-walled or radial flattened outside - guide sleeve or the like bridged radially outside pressure-neutral.

The invention, out as a split expansion ring formed clamping ring can be made from a roll pullable steel or plastic wire, e.g. B. from one Stainless steel square wire 4 × 4 mm, by fitting Cut to length and bend in the simplest way. That with the known expansion ring (DE-PS 32 47 452) he required welding of the two expanding ring ends together not applicable. The welding of stainless steel is because of that  in the event of emission of chrome and nickel vapors smoke development harmful to health (increased Cancer risk). In addition, such little sweat pose a risk of breakage when high tensile forces are applied there were weak points, since the undivided spread ring after its expansion in the inner groove of the seal ring has largely disappeared in the case of her Fracture can hardly be determined afterwards, and the therefore the tightness of the socket connection in question len. In the expansion ring according to the invention, the instead a weld in the overlap section and something locking device arranged in addition (small Teeth, cams and recesses, friction surfaces, etc.) by non-cutting (pressing, rolling or the like) and / or by cutting (grinding, milling, drilling or The like.) Shaping or deforming the two spreader ring ends in a short, fully automated production step made. Any vulnerabilities can do not arise because the required strength ke the spreader ring in the area of the locking device exactly according to the pressure forces to be expected act on the expansion ring in the operating position are calculated in advance and therefore dimensioned correctly leaves.

An additional or alternative way to tan potential definition of the two overlapping Ends of the expanded spreader ring is the both ends of the ring by gluing (e.g. by means of a superglue applied before spreading or a solvent) or by welding (e.g. by means of ultrasonic or vibration welding of art rings) - preferably over the entire overlap section - to connect permanently.

The one on the radial outer circumference of the two expanding ring ends existing gapless transition from an expanding ring end  to the other end of the spreader ring ensures an all around un broken seal between the inner wall of the sleeve and the elastomeric sealing ring inside. If, for design reasons, between the two A radially outer joint is present at the ends of the expansion rings, this joint is made using a thin-walled (e.g. 0.5 mm thick) or flattened guide sleeve or the like. Bridged radially outside pressure-neutral. This means that between the expansion ring and the tangential end of the guide sleeve or the like. Radially externally existing gradation radially so small is that this gradation relates to the dense layout of the Sealing ring on the inner wall of the sleeve does not follow partially affects.

Since the usually made of a relatively thin steel or Plastic wire existing split expansion ring of its own diameter expansion of approx. 10-20 mm hardly Opposing resistance, need on him in his Installation in the sleeve only the - relatively low - Ra dial forces to be applied to achieve the functionally necessary deformation of the elastomeric you tion ring required in the area of the expansion ring are. These can be precisely metered by pressure limiters radial forces are far from sufficient to when installing the expansion ring also the sleeve of the To break the pipe. Additional sleeve breakage control len can therefore be omitted. This assembly security enables the installation of the sealing rings and he expansion rings according to the invention in a single, extreme rational collection process in the 40 to 77 Pipe (e.g. stoneware pipes DN 100 - DN 150) ten tube packages without these tube packages subsequently Lich because of broken during the pre-assembly of the seal Sleeves dismantled and repackaged will need.  

A possibility for tangential parallel guidance and for radial locking of the two expanding ring ends there is an advantageous embodiment of the Invention in that from a tube or the like. existing expanding ring along its reshaped Spreading rings and at least in its adjacent undeformed profile areas a connecting wire, -strips or the like into the hollow channel of the tube or similar is used. To the connecting wire or the like. in to fix its functional position exactly this firmly with one of the two straddle ends connected. Its tangential length is preferred dimensioned so that the connecting wire or the like. also after the spreading ring is still in the unb shaped profile area of the not firmly connected to it Nothing is enough.

In the event that the manufacture of the invention Spreading rings made of material technology or other green which is of particular advantage in the injection molding process, provides a development of the invention that a Casting or spraying material, such as. B. from hardener network resin or thermoplastic, best Hender expansion ring, which in a mold, such as. B. in an injection mold, too at least approximately at its overlap section has the same cross-sectional shape as one in one continuous strand production process Spreader ring. For this purpose, the is continuously cross cut material strand recess of the molding by simply unscrewing the Mold blanks (e.g. a standard part) manufactured and then the small tool part, the locking device (for example small teeth, Cams and recesses, friction surfaces or the like.)  forms without cutting during injection molding, into the material strand recess of the mold fitted and be in it consolidates.

In order to produce the expansion rings according to the invention According to Wei Wei, saving manufacturing costs is an option terbildung the invention on the possibility that - old native to that provided with a locking device Overlap section - the alternative overlap section cut the expansion ring no cross-sectional deformed Locking device, and that - in the loading drive position of the expansion ring existing - tangential Determination of the radial diameter of the expansion ring by gluing or welding the overlap the spread ring ends is made. Especially at expansion rings made of plastic, the one correspondingly long overlap section of z. B. min. 20-30 mm, it is sufficient if the two Spreading rings over the entire length of their overlap section without the presence of a cross Sectional locking device using mate Rialverbund (gluing, welding, etc.) permanently are put together.

According to a further embodiment of the invention safe tangential parallel guidance and radial ver locking of the overlapping spreader rings there by achieving that at least one of the two spread wrestling in the final assembly-relevant overlap cut at least one axially protruding projection has jump, the other spreader ring end each engages behind radially locking and / or in the engages tangential guide groove.

The particular when assembling the pointed end of the Axial locking of the next tube required two straddle ends can be advantageous th embodiment of the invention in a simple manner  by achieve that the axial width of the groove of the Sealing ring in which the expansion ring in its Operating position is in the unassembled state of the Sealing ring to the radially outer groove base tapered and / or that the axial width of the groove in the sem condition in the groove base is the same size or smaller than the axial width of that adjacent to the bottom of the groove Strand area of the final assembled expansion ring, esp especially in the area of its overlap section.

Based on the execution shown in the drawing examples, the invention is explained in more detail. Show it

Fig. 1, the ring end at the overlap portion of the two spreading arranged locking device in a radial view,

Fig. 2 shows the expanding ring with locking means along the line II-II (from FIG. 1) in tangential view,

Fig. 3 as above, however, with an axial projection

Fig. 4, the locking device with Überlappungsab section of the expanding ring in the axial plan view,

Fig. 5, two connected firmly to the overlapping section by welding together Spreizringenden in a radial view,

Fig. 6 shows the overlap area is provided with a guide sleeve pungsabschnitt of a radially expanding ring gear in the direction perpendicular to the tube axis Führungshülsen- cross-section,

Fig. 7 is a group consisting of a tube with a spreader ring, inserted in the overlapping portion in the hollow channel connecting wire in a radial view,

Fig. 8 as before, but the tangential view of the expansion ring cross-section along the section line VIII-VIII (from Fig. 7) and

Fig. 9 shows the axial cross section of a sleeve pipe seal with the overlap portion of an expansion ring according to the invention.

The trained in Fig. 1 as a split expansion ring 1 and made of a, in the inexpensive Strangproduktionsver manufactured steel wire existing clamping ring has at its two expanding ring ends 2 and 2 'each have a row of teeth 3 and 3 ' as a tangential locking device. Both rows of teeth 3 and 3 'were cut by cutting, such as. B. by milling, in a short, fully automated production process on the originally continuously continuous steel wire of the two expanding ring ends 2 and 2 'attached. The teeth 4 of the two rows of teeth 3 and 3 'extend towards each other in the axial direction and are in the overlap section 5 in mutual engagement. In the two rows of teeth 3 and 3 'are each at their own full profile 6 of the expansion ring 1 towards oblique tooth flanks 7 at an angle of 45 ° to Tangenti alrichtung, while the adjacent tooth flanks 7 ' are aligned axially. In the radial expansion of the expanding ring 1, the two rows of teeth 3 and 3 'slide on the oblique tooth flanks 7 of their teeth 4 one above the other until the radial contact pressure of the expanding ring 1 previously set on the expanding device is reached on the sealing ring. The two dashed lines show the position of the two expansion ring ends 2 u. 2 'before the start of the expansion of the expansion ring 1 . The preferably in an axially narrow, radially inwardly open groove of the sealing ring lying expansion ring ends 2 and 2 'are axially compressed in the water groove, so that the overlapping section 5 lying tangential partial areas of the two rows of teeth 3 and 3 ' snap into each other. Since the axial alignment of the tooth flanks 7 'no mutual mutual tangential sliding and therefore no sliding back of the two rows of teeth 3 and 3 ' allows more, the expansion ring 1 remains tangentially arre in its previously he reached radial diameter position, making its permanent function as a clamping ring for the sealing ring is guaranteed. By a slight inclined backward position of the axially aligned tooth flanks 7 'in Fig. 1' - also to the full profile 6 of its own expanding ring ends 2 and 2 '- the security of the durability of the tangential locking of the two expanding ring ends 2 and 2 ' can be improved even further ver.

The locking device of the expanding ring 1 shown in FIG. 2 according to the section line II-II from FIG. 1 shows the two interlocking expanding ring ends 2 and 2 'and the tangential view of a tooth flank 7 ' running in the axial direction.

In the locking device of an expansion ring 1 shown in FIG. 3, a tangential continuous axial projection 8 engages in a tangential guide groove 9 fitted in the teeth 4 of the expansion ring end 2 . This ensures a safe tangential parallel guidance and permanent radial locking of the overlapping two spreading ring ends 2 and 2 'is achieved.

The two expanding ring ends 2 and 2 'shown in Fig. 4 in axial plan view go smoothly into each other at their radial outer circumference at the joint 10 without any gap or other interruption, so that a seamless pressing of the expanding ring 1 to the sealing ring and its all-round density System on the inner wall of the socket is guaranteed.

In Fig. 5, the two expanding ring ends 2 and 2 'have no cross-sectional locking device, such as. B. two rows of teeth or the like. The axial strength of the two expansion ring ends 2 and 2 'is only halved for reasons of space by milling or already during injection molding, so that the expansion ring 1 in the overlap section 5 has the same axial dimension as the rest of the full profile 6 of the z. B. made of plastic material expansion ring. 1 The spreading of the expansion ring 1 was carried out tangentially, the expansion ring ends 2 and 2 'located in the overlap section 5' is brought about by welding (e.g. ultrasonic or vibration welding) of the plastic material.

According to Fig. 6, the two reduced diameter expansion ring ends 2 and 2 'arranged as Feststellein direction 4 of the two rows of teeth 3 and 3 ' towards each other in the radial direction. This radial alignment of the teeth 4 is preferably used when the axial dimension of the expansion ring 1 may only be made relatively small for reasons of space. A the radially outer joint 11 , which lies between the two expansion ring ends 2 and 2 ', bridging guide sleeve 12 (z. B. from 0.5 mm thick stainless steel sheet) ensures that on the radial outer circumference of the expansion ring 1 no the sealing system of Sealing ring on the inner wall of the sleeve creates a dangerous gap. The guide sleeve 12 is, for. B. tangentially fixed by a welding point on the expansion ring end 2 , thereby preventing the guide sleeve 12 from moving tangentially away from the joint 11 .

In FIG. 7, 1, the square-shaped in cross-section expanding ring on a hollow channel 13. In the area of the shape-changing, each with a row of teeth 3 and 3 'verse hen expansion ring ends 2 and 2 ' and in the adjacent areas of the full profile 6 of the expansion ring 1 is a connecting wire 14 , z. B. made of stainless steel or break-proof, fiber-reinforced plastic, inserted into the hollow channel 13 , which ensures the required tangential parallel guidance and a permanent radial locking of the expansion ring ends 2 and 2 '.

In the tangential view in FIG. 8. the section line VIII-VIII (from Fig. 7) shown expanding ring ends 2 and 2 'is the connecting wire 14 in a hollow channel 13 which also extends over the teeth 4 of the two rows of teeth 3 and 3 '.

According to FIG. 9, on the inner wall 15 of the sleeve 16 of a stoneware pipe there is a groove 17 with a rectangular cross section, into which the axially extending front part 18 of the elastomeric sealing ring 19 is inserted. As allei niges fastener for the sealing ring 19 is a gap-free and therefore all around tight against the front part 18 of the sealing ring 19 adjacent expansion ring 1 , which - in cooperation with the groove 17 - the sealing ring 19 during assembly of the pipes and in the operating state of the sleeve pipe seal against axial displacement fixed in sleeve 16 .

Reference symbol list

1 expansion ring
2 + 2 ′ spread ring ends
3 + 3 ′ rows of teeth
4 teeth
5 overlap section
6 full profile
7 oblique tooth flanks
7 ' axial tooth flanks
8 axial projection
9 tangential guide groove
10 Push of the spreader rings
11 fugue
12 guide sleeve
13 hollow channel
14 connecting wire
15 inner wall (of 16 )
16 sleeve
17 groove (in 16 )
18 front section (of 19 )
19 sealing ring

State of the art mentioned in the patent application:

DE-OS 27 43 238 v. September 26, 1977
WOCO / Bad Soden, DE
DE-PS 27 54 982 v. December 9, 1977
WOCO / Bad Soden, DE
DE-PS 23 53 184 v. August 27, 1973
Spaanberg / Sjöbo, SE
NL-OS 81 02 199 v. 05/05/1981
Bold-Venture AG / Zug, CH
DE-PS 32 16 682 v. 05/05/1981
Bold-Venture AG / Zug, CH
DE-PS 32 47 452 v. December 22, 1982
ENBI BV / Nuth, NL

Claims (6)

1. Clamping ring with which an elastomeric sealing ring is fastened in the sleeve of a pipe, characterized by the combination of the following features:

• a) the clamping ring is formed as a split expansion ring ( 1 ),
• b) the expansion ring ( 1 ) consists of an originally continuously cross-sectional, extrusion, rolling, drawing or in a similar continuous strand production process, suitably cut to length and formed into an unconnected ring shaped strand of material (steel wire, steel or plastic rod or rod, steel or plastic tube or similar),
• c) the expansion ring ( 1 ) also in the operating position on its expansion ring ends ( 2 , 2 ') has an overlap section ( 5 ),
• d) the Feststellein direction arranged on a tangential longitudinal area at both ends of the expanding ring ( 2 , 2 ') is produced only by non-cutting and / or cutting or shaping of the originally also on the expanding ring ends ( 2 , 2 ') continuously cross-sectionally identical material strand,
• e) in the operating position of the expansion ring ( 1 ) before, by means of the locking device made tangential fixing of the expansion ring ends located in the overlap section ( 5 ) ( 2 , 2 ') is by mutually engaged teeth ( 4 ), cams and recesses, friction surfaces or the like and / or by gluing or welding the overlapping expanding ring ends ( 2 , 2 '),
• f) at the latest in the operating position of the expanding ring ( 1 ), the two overlapping expanding ring ends ( 2 , 2 ′) merge seamlessly at their radial outer circumference also at the joint ( 10 ), or one between those at the expanding ring ends ( 2 , 2 ′) The radially outer joint ( 11 ) is bridged by a guide sleeve ( 12 ) or the like, which is preferably thin-walled or radially flattened on the outside radially on the outside, in a pressure-neutral manner.

2. Clamping ring according to claim 1, characterized in that in a chen from a tube or the like existing expanding ring ( 1 ) along its shape-changing expanding ring ends ( 2 , 2 ') and at least on its adjacent undeformed profile areas a connec tion wire ( 14 ), strips or the like is inserted into the hollow channel ( 13 ) of the tube or the like. 3. Clamping ring according to one or both of claims 1 and 2, characterized in that a casting or spray material, such as. B. from cross-linked synthetic resin or thermoplastic, existing expansion ring ( 1 ), which in a mold, such as. B. was produced in an injection mold, also at its overlap section ( 5 ) at least approximately the same cross-sectional shape as a spread ring produced in a continuous strand production process ( 1 ). 4. Clamping ring according to one or both of claims 1 and 3, characterized in that - old (5) native to the provided with a locking device overlapping portion - the alternative overlap portion (5) of the expansion ring (1) has no querschnittsver shaped locking means, and that the - in the operating position of the expansion ring ( 1 ) - tangential definition of the radial diameter of the expansion ring ( 1 ) is made by gluing or welding the overlapping expansion ring ends ( 2 , 2 '). 5. Clamping ring according to one or more of claims 1 to 4, characterized in that at least one of the two expanding ring ends ( 2 , 2 ') in the final assembly-relevant overlap section ( 5 ) has at least one axially slightly protruding projection ( 8 ), the other Spreader ring end ( 2 , 2 ') each engages radially locking and / or engages in the tangential guide groove ( 9 ). 6. Sealing ring, which is by means of one, according to the characteristics of one or more of claims 1 to 5 formed clamping ring BEFE Stigt in the sleeve of a pipe, characterized in that the axial width of the groove of the sealing ring ( 19 ), in which is the expansion ring ( 1 ) in its operating position, in the unassembled state of the device ring ( 19 ) tapers towards the radially outer groove base, and / or that the axial width of the groove in this state in the groove base is equal to or less than the axial width of the strand region of the final assembled expansion ring ( 1 ) adjoining the groove base, in particular of its overlap section ( 5 ).