DE7010211U - INSULATED PIPE COUPLING. - Google Patents

Description

ITIXVALI

ing. B. HOLZEB

«9 AUGSBURG

PHni - WBUBR - HTItAMa 1 *

Augsburg, May 26th, 1997I

Atntl.Aktz .: G 70 10 211.3 Gbm Anw. Aktz .: W.467

Georg Walz, Heidenheim / Brenz, Nibelungenstrasse 16

Isolation pipe coupling

The innovation concerns insulating pipe couplings one pipe end with a flared collar and with another pipe end that is widened like a sleeve, which engages around one pipe end and is drawn in on the socket edge over this pipe end, as well as with two arranged on both sides of the flared pipe bundle Sealing rings made of elastic material.

In particular, the innovation relates to insulating pipe couplings, which are used as house couplings for gas pipes or water pipes.

Such insulating pipe couplings correspond in their outer shape to a type known under the designation "Locked expansion socket connection" which is described, for example, in DT-PS 643 721. In this known insulating pipe coupling, the inserted pipe end is provided with a Doppelbörde1 outer collar, on which elastic sealing rings are arranged on both sides , one of which lies against the socket base and the other against a rigid ring which is held by the knocked-down end of the socket . In this known design , one end of the inserted tube is sharpened and provided with an annular recess. When the pipe end is inserted, it is pressed into an accumulation of bitumen located in the socket base, which is previously softened by heating the socket base with the aid of a welding torch. To prevent stray electrical currents from crossing over, a further ring made of insulation material is provided for the purpose of better connection of the inner bitumen protective layers of the pipes.

• ·

This type of sealing or electrical insulation

is undoubtedly very complex. This is a disadvantage Socket flange connections for pipes also that the socket edge must be made red-warm so that it can be on his can be turned over in its entirety. For this reason, a heat insulating sleeve is also provided « which protects the inner tube against heating. The required hot deformation means that it is dimensionally or dimensionally stable ") The production of clutches is not assured and they often age Seals due to the heat treatment prematurely. An additional heating that is detrimental to the sealing rings also makes the bitumen accumulation on the socket base is necessary. Such known couplings also have many individual parts, whereby their production is complicated and expensive and as a result, moreover, only relatively large overall lengths make it come true.

From DT-OS 1 600 410 rigid insulating pipe couplings are known in which on one side of the federal government one end of the pipe a sealing ring made of electrically insulating material and on the other side a locking ring an electrically insulating material of high compressive strength, such as Bakelite, is arranged. All Cavities in this insulating pipe coupling are filled with liquid synthetic resin. Before assembling all

Sandblasted inner surfaces, the *: 1t to protect against Twisting the resin adheres better. Because of the synthetic resin potting compound these known insulating pipe couplings are rigid and therefore only used as an electrical separation point applicable. It is also a disadvantage that these insulating pipe couplings are improperly twisted Pipe ends leak against each other, i.e. become unusable because the synthetic resin casting compound cracks.

From US-PS 2 79 ** 658 and from DT-AS 1 227 759, for example, insulating pipe couplings are known which require the use of extensive screw sockets or threaded rings and are therefore uneconomical in terms of manufacture and assembly. As house connection couplings, inexpensive insulating pipe couplings manufactured in large numbers are required, which is why such thread-type insulating pipe couplings, which are expensive to manufacture, are not often used as house connection couplings for economic reasons.

The last-mentioned disadvantages are in part with a further known type of threadless insulating pipe couplings avoided in which the socket edge is not flanged, but in which instead a ring welded on, such well-known house

t * r - ι
a · ·

Isolierrohrkupplungeii are for example in the DT-GbmS 1 938 402. With these insulating pipe couplings carries an inner pipe socket which protrudes into the enlarged end of the opposite pipe socket an outer collar, which with its end face an insulating ring enclosed on both sides by sealing rings against a radially directed inner surface of the expanded pipe socket and presses with its opposite to the end face rear surface forms a facility for a second insulating ring, which is from its rear through a lower Pressing pressure with the widening end of the outer pipe socket welded steel pressure ring is pressed against the collar. On the one hand, the collar and, on the other hand, the steel pressure ring are interlocked with one another the second mentioned insulating ring secured against mutual rotation.

Such insulating pipe couplings also have disadvantages:

When welding, the seals and insulation are already in the coupling, which as a result of the short creepage distances for the welding heat age and become brittle or charred and thereby reduce the insulation capacity. The coupling structure is complex

and expensive, since separate rings are provided for sealing and insulating respectively. In addition, the Securing against rotation described is a very complicated design and finally the coupling production very labor intensive. Furthermore, due to the coupling construction, this is only a relatively large overall height (Outer diameter) or overall length can be produced.

\) When using insulating pipe couplings as

House connection couplings for water or gas pipes but it is necessary that these have the smallest possible axial length and the smallest possible outer diameter have so that they can be installed directly on the masonry.

The aim of the innovation is to achieve the object of providing an insulating pipe coupling for medium pressures in this way improve that with labor and material saving Manufacture a cheap, torsion-proof, optionally rigid or flexible and corrosion-protected Construction with minimal external dimensions results.

According to the innovation, this object is achieved by an insulating pipe coupling of the general type set out at the beginning Design solved, which is characterized in that the

"LV ¹ ITZWi ¹ V"

sleeve-like extension of the other end of the pipe in itself is formed in a known manner by a collar ring welded to this pipe end, that also the two pipe ends while condensing the one between them Sealing ring are clamped against each other and held in this state by the other sealing ring, which located in the annular space between the outer wall of one pipe end and the inner wall of the ring ring and through the drawn-in edge of the coupling ring is also compacted is that further the two sealing rings jointly the entire annular space between the outer ??, n4 r ^ g of one pipe end or the pipe collar and the entire inner wall of the coupling ring fill in completely, and that finally through at circumferential intervals on _sr Überurfringinnenwandung attached and interacting with the sealing rings weld marks or beads and / or by a the end face of the pipe facing the other end of the pipe Knurled pattern attached to the flanged pipe end Pipe ends are secured against mutual rotation.

There are applications for the insulating pipe coupling according to the innovation, in which this is only used as an Isoliex or separation point to prevent sound propagation ■, -, within a pipeline system, such as

for example in the water supply network within high

m -.4 tt ·· »

houses, thereby avoiding the rush of water being audible throughout the skyscraper; or such as in the boiler area of central heating systems to prevent burner noise is transferred to the central heating. There are also applications in which the insulating pipe coupling after the innovation is used as a vibration damper, for example in pipeline systems on ships. For all of these applications is the insulation pipe coupling according to the innovation excellently suited.

In a further development of the innovation, the elastic material of the two sealing rings has an electrical one Insulation ability, so that the corresponding three-dimensional shape of an insulating pipe coupling according to the innovation thus both represents a sound separation point as well as an electrical separation point. Preferably, the other sealing ring is as further consequence of the retraction of the collar ring edge in this way over one end of the pipe under the collar ring edge arched on the outside so that there is an extended electrical creepage distance.

In a further developed three-dimensional shape of the insulating pipe coupling according to the innovation, the other is a sealing ring replaced by an electrically insulating potting compound and

the two pipe ends are compressed against one another by the sealing ring located between them stretched and held in this state by the potting compound, which in the annular space between the outer wall of one pipe end, the one sealing ring and the inner wall of the coupling ring is introduced and in the cured or bound state, the two pipe ends in their rigidly connected to each other tensioned position.

According to the innovation, the casting compound consists of a material such as a special cement-quartz powder mixture, which after hardening or setting forms a rigid body, which by an outer Special coating is slotted against moisture absorption and has a high dielectric strength.

In the insulation pipe coupling according to the innovation

₍ The welding is carried out before the sealing ring or sealing rings made of elastic material is or are being introduced. In this way, the risk of the sealing or insulating rings becoming charred and thus the insulating capacity of the coupling connection is reduced.

The use of a hardening

-Q-

or setting potting compound represents a very simple and cost-saving teohnisohe solution, since the insulating pipe coupling according to the invention is preferably designed to be rigid or rigid when used as a domestic connection coupling for gas lines.

In other applications, "in which the insulation pipe coupling according to the innovation must have a certain flexural elasticity or must serve not only as an electrical separation point but also as a sound separation point, a combination of two sealing rings is required instead of the combination of one sealing ring made of elastic, electrically insulating material and the potting compound each provided from elastic, electrically insulating material, which has already been described above.

The upper throat edge is made by cold forming under, -. simultaneous compression of the ring or rings elastic, electrically insulating material. This is also a very simple and cost-saving one Solution, which also has the advantage that a dimensionally accurate production of the coupling connection is ensured will. Without reworking, the result is an externally smooth, rounded insulating pipe coupling with minimal « Outside diameter and minimum length.

- 10 -

The innovation is explained in more detail below with the aid of some preferred three-dimensional shapes of insulating pipe couplings described, which are shown in the drawings as an example. Show it:

Fig. 1 schematically partially in

Longitudinal section of a preferred three-dimensional shape of an insulating pipe coupling after the innovation, and

Figs. 2 and j5 cut schematically in the longitudinal half

In each case a further preferred three-dimensional shape of an insulating pipe coupling after the innovation.

In Fig. 1 is a preferred Rauraform an insulating pipe coupling according to the innovation in ready-to-install State partially shown in longitudinal section. An outer collar 2 is flanged at one end of the pipe 1. On one the other pipe end 3 is welded on the side facing the pipe end 1, a coupling ring 4, which the collar encompasses and is drawn in over the pipe end 1. Between the end face 5 facing the pipe end j5 of the crimped on Pipe collar 2 and the inner wall of the coupling ring is a sealing or electrically insulating ring 6

- 11 -

made of elfiLStischetn material, with. Synthetic rubber, arranged. An annular space between the outer winding of the pipe end 1 and the axially and radially outer surface of the collar 2 and the inner wall of the The union ring 4 is formed by another Sealing ring 7 filled, which by pulling in of the collar ring edge has been compressed over one pipe end 1 and which thus causes the ring 6 between of the end face 5 of the pipe collar 2 and the inner ring of the coupling ring is constantly kept under compressive stress, this Compression stress is applied when assembling the insulating pipe coupling by an axial force exerted on the two pipe ends Generated until the edge of the coupling ring 4 is drawn in over the pipe end 1 by cold deformation. To When this edge of the coupling ring 4 is drawn in, the two rings made of elastic material form a flexurally elastic one Connection between the two pipe ends. The two sealing rings 6, 7 jointly fill the entire annulus between the outer wall of one pipe end 1 or of the pipe collar 2 and the star-shaped union ring inner wall completely off. The other sealing ring 7 bulges as a result of the pulling in of the collar ring edge over the one pipe end 1 from under the collar ring edge that an extended electrical creepage distance 10 results.

- 12 -

In certain applications, however, an I

Coupling connection required, which has a high flexural strength. For this reason, in the further preferred three-dimensional shape of an insulating pipe coupling shown in FIG and the inner wall of the upper throwing ring 4 fills and causes the ring 6 between I of the end face 5 of the pipe collar 2 and the socket base is constantly held under compressive stress. This compressive stress is generated during the assembly of the insulating pipe coupling by an axial force exerted on the two pipe ends until the potting compound 8 is introduced into the annular space and has hardened or set therein. After setting or hardening, the casting compound forms a rigid body which maintains the compressive stress exerted on the ring 6 made of elastic material, so that the force exerted from the outside on the pipe ends can be terminated.

At circumferential intervals are on the inner wall of the coupling ring 4, for example in the form of welding marks or beads, knob-like elevations 9 attached,

- 13-

I 114 *

1 * 1 · ·

which interact with the hardened or set potting compound and thus the two coupled pipe ends I and 3 secure against mutual rotation. When referring to Pig. 1 are the three-dimensional form of the innovation these knob-like elevations 9 either omitted or in addition to one on the end face 5 of the pipe collar 2 formed knurled patterns available.

The casting compound 8 consists of a material such as a special cement-quartz powder mixture, which is insulated against moisture absorption by an external coating 11 and after hardening or setting forms a rigid body and together with the ring 6 aas elastic, electrically insulating material high ohms * see resistance of the separation point guaranteed.

Another, in Pig. 3 shown preferred three-dimensional shape of the innovation, the pipe end 3 is not with a welded union ring 4, but the sleeve-like extension 4 'is made of the pipe material self-educated. This spatial form of the innovation is found particularly with pipes with a small clear width or with low wall thickness application.

The assembly of one shown in FIG

- 14 -

Insulating pipe coupling according to the innovation goes into the following Way in front of you: First of all, for example by cold forming in a press, one Tube end 1 of Bur J. 2 flared and an edge of an initially still cylindrical upper throw ring 4 accordingly the outside diameter of the other pipe end 3 is drawn in. Then the union ring 4 is welded onto the other pipe end 3 in the area of this drawn-in edge. Then the sealing ring 6 is inserted into the union ring 4 and the flared pipe end 1, 2 also in this Finally, the animal becomes another Sealing ring 7 on the flange tube 1 up to the collar postponed. After that the cicr &? \; prepared Coupling parts pushed together over an unlocking pin and the two pipe ends 1 and 3 are pressed axially against one another. The centering pin simultaneously causes that the sealing ring 6 cannot escape into the pipe interior when it is pressed or compressed. While maintaining the pressure between the two at the same time Pipe ends 1 and 3 are now compressed by the other sealing ring 7 of the collar rim over the pipe end moved in.

This three-dimensional shape of an insulating pipe coupling according to the innovation shows a certain in the ready-to-install state

- 15 -

Elasticity on what in many applications of Advantage is.

According to the illustration in FIG. 2, a rigid potting compound 8 is provided instead of a sealing ring 7. This insulating pipe coupling is assembled as follows: Eas flaring of the collar 2, the one-sided Pulling in an edge of an initially still cylindrical coupling ring 4, the welding on of this coupling ring and the insertion of the sealing ring 6 and the introduction of the flared pipe end 1, 2 in the coupling ring are shown in made in the manner already described. Then the prepared coupling parts are again put together with the sealing ring 6 located between the two pipe ends pushed together over a centering pin and axially pressed against each other. Finally, the between the outer wall of the pipe end 1, the sealing ring 6 and the inner wall of the coupling ring 4 formed annular space with the potting compound 8 poured and at the same time Keeping the two pipe ends pressed against one another waited for the potting compound to harden. Those in this Potting compound 8 protruding, knob-like elevations serve as a safeguard against rotation of the two pipe ends against each other. After the sealing compound 8 has hardened or set, the insulating pipe coupling is after the

, 16 -

Innovation ready for installation.

The spatial shape of the renewal according Isolierrohrlcupplung shown in Fig. 3 is substantially assembled in the manner described in the latter section way, only with the exception that produce no Uberwurfrlng and on the pipe end "*> is to be welded,
but that this pipe end is to be widened like a sleeve V on the side facing the pipe end 1.

- 17 -

Claims (1)

Protection claims: 1. Insulating pipe coupling with one, one flared Collar having pipe end and with another, sleeve-like widened pipe end, which is one pipe end encompasses and is drawn in at the socket edge over this pipe end, as well as with two on both sides of the flared pipe collar arranged sealing rings made of elastic material, characterized in that the sleeve-like extension of the other pipe end is formed in a manner known per se by a coupling ring (4) welded to this pipe end is that also the two pipe ends (1, 3) under compression of the one sealing ring (6) located between them tensioned against one another and in this state are held in place by the other sealing ring (7), which is located in the rim space between the outer wall of one end of the pipe (1) and the inner wall of the coupling ring and through the drawn-in edge of the coupling ring is also compressed that further the two sealing rings together the entire annular space between the outer wall of one end of the pipe or of the pipe collar (2) and the entire inner wall of the ring ring and finally through at circumferential intervals Welding marks or welding marks attached to the inner wall of the coupling ring and interacting with the sealing rings - 18 - 14 r tr Corrugations (9) and / or through an end face (5) of the flared on the other pipe end (5) facing Pipe end (2) attached Rndeltnuster the pipe ends are secured against mutual rotation. 2. insulating pipe coupling according to claim 1, characterized in that the elastic material of the two sealing rings (6, 7) has an electrical insulation capacity. 3 · insulating pipe coupling according to Ansrj * "ih 1 and 2, characterized in that the other * sealing ring (7) as a further consequence of the pulling in of the 'union ring edge over the one pipe end (1) is arched outward under the union ring edge in such a way that results in an extended electrical creepage distance (10). ) 4. insulating pipe coupling according to claim 1 or 2, characterized in that the other sealing ring (7) is replaced by an electrically insulating potting compound (8) is and that the two pipe ends (1, 3) under compression ■ ^{: of} the sealing ring (6) located between the piers are tensioned against each other and in this state through the potting compound are held, which in the annulus : between the outer wall of one pipe end (1), the - 19 - a sealing ring (6) and the inner wall of the coupling ring is introduced and in the fully hardened or tied state, the two pipe ends are braced in their relative to one another Location rigidly connects. 5. insulating pipe coupling according to claim 4, characterized characterized in that the casting compound (8) consists of a material such as a special cement-quartz powder mixture consists, which forms a rigid body after hardening or setting, which is protected against moisture absorption by a special outer coating (11) and has a high dielectric strength. - 20 - 7019211-2.9.71