DE29924006U1 - Pipe or pipe system for pipe distributors, heating circuit distributors, boiler distributors and the like. - Google Patents

Abstract

The invention relates to a pipe or pipe system for use in so-called pipeline manifolds, heating circuit manifolds, boiler manifolds or similar devices while using pipes having a circular to elliptical or lenticular cross section. At least one dome-like cross section expansion is provided which gives the pipe a partially flat upper surface. This dome-like expansion is open in a circular manner, is provided with a collar in the interior of the pipe, and is optionally provided with an inner threading. A branch pipe comprising an outer threading and an outer beading can be screwed into the inner threading in a sealing manner.

Description

Applicant:

Albert Werlein

Schwarzstr. 4

D - 81669 Munich

Pipe or pipe system for pipeline distributors, heating circuit distributors, boiler distributors and the like.

The invention relates to the design of at least one pipe or a pipe system for use in so-called pipeline, heating circuit or boiler distributors according to the preamble of claim 1.

Known components for the above-mentioned assemblies can be found, for example, in DE OS 1 751 893. Here, several small individual pipes branch off from a main pipe. These individual pipes are welded to the outer surface of the larger pipe. This welding requires a high level of technical effort. In addition, the weld seams involve a number of imponderables. On the one hand, slag inclusions can occur during welding, and on the other hand, these weld seams may not be tight. Further

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Hansmann & Vogeser, Goppingen

Disadvantages include the possible distortion of the components and also optical impairments.

In another state of the art - the German document DE 27 07 539 C2 - a pipe-in-pipe system is shown, for example, in which the inner pipe serves as the inlet, while the outer pipe is then provided for the return. Some of the branch lines shown there are either only connected to the outer pipe, while others are only connected to the inner pipe. The pipe-in-pipe system is made of square pipes. The branch pipes are either soldered or welded into the main pipes.

Another state of the art is disclosed in the German publication DE-AS 21 16 982. According to this, the pipe-in-pipe system described above is implemented in a different way. Branch pipes are located on a sheet metal body. The sheet metal body is enclosed on at least one side by a substantially open rectangular cross-section, which in turn also has branches. In addition, this latter body also has holes that allow the branches of the sheet metal body to be pushed through. The other side of the sheet metal body is enclosed by a body that is also rectangular, but has

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For example, this one has no branches. These three elements are brought together in such a way that a circumferential joint consisting of three sheets is created, which is fixed by soldering or welding. The branches of the sheet-metal body on the surface of the body with the through holes must also be soldered or welded.

Another pipe connection is known from DE 195 12 024 C2. In contrast to DE-AS 21 16 982 (see above), the branches are not welded here. There, the branches are screwed into the threads of a first U-shaped channel. To prevent leakage, sealing rings are used between the surface of the first channel and the branch. A second channel is formed by attaching a partition to the end of the first channel and placing a second U-shaped channel on top of it. However, if a branch is to be connected to the second channel, this branch engages through the partition with a longer nozzle. To ensure the tightness between the first and second channels, the extended nozzle has a ring seal. In this way, the upper channel, the lower channel and the partition come together at the joint. These parts are mechanically connected to one another by welding them. This welding

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This in turn leads to distortion and the other well-known disadvantages of welding.

Overall, it can be stated that pipe connections or pipe distribution systems are known from the state of the art, but they have a large number of welded and/or soldered seams.

It is therefore an object of the invention to find a pipe or pipe system for pipeline distributors, preferably for heating circuit or boiler distributors, in which welding or soldering is largely eliminated for connecting individual parts and with which the production or assembly becomes more cost-effective.

This object is achieved by a pipe or pipe system for use in so-called pipeline, heating circuit or boiler distributors and similar devices with the features of claims 1 and 4 - in particular by the features of the characterizing parts; advantageous further developments or embodiments are disclosed by the following claims 2, 3 and 5 to 19.

One embodiment of the invention concerns the axial connection of the new main pipe, provided with dome-like extensions, with further pipes.

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For the aforementioned axial connections, there are already screwable connections that save or avoid weld seams, but these known screwable connections require a thread inside the main pipe and an additional, special, complex adapter (nipple) as well as an additional union nut on the adapter, which is connected to the external thread of the continuing pipe.
The further embodiment of the invention is such that the end of the pipe designed according to the invention is adapted to the connection size of the continuing pipe by non-cutting forming of the pipe diameter, for example reduced, and after fitting a union nut, also by non-cutting forming, is provided with an outward-facing collar (flanged edge). An optional bead additionally attached between the flanged edge and the diameter reduction enables the insertion of a sealing ring.

The starting point for another further embodiment of the invention was the consideration of how a connection point between a main pipe and a branch pipe could look that is not welded or soldered. It was known that welded or soldered connections are made because a threaded connection between a pipe in the peripheral surface of a larger pipe with a circular cross-section

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or equivalent cross-section is not necessarily leak-proof because there are no flat sealing surfaces. Known pipes for such pipe connections are therefore extremely thick-walled so that sealing surfaces can be machined or machined; in addition, expensive brass is usually used as the pipe material.

Therefore, the invention provides that a pipe which is thin-walled compared to the pipes mentioned is permanently deformed and flattened in the region of a branch, thus creating a flat connection point for a branch pipe.
This flattening can also be done in a special way by not flattening the larger pipe, but by expanding the larger pipe in the area of the connection point (branch) - i.e. partially over its longitudinal extent.

The dome-like expansion of the cross-section of the relevant area or areas of the pipe intended for a branch thus achieved is an essential new feature of the subject matter of the invention.

If this flat mounting surface on a pipe is now broken through, e.g. by means of chipless forming, and the resulting, preferably inward-facing neck is provided with a thread, a branch pipe, which also has a thread, can be inserted into this opening.

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screwed until its thread run-out, which has a collar for example, rests on the flat mounting surface.

A further development of the invention also provides that by attaching an external bead in the end area of the branch pipe, an extended contact surface is created between the branch pipe and the flat mounting surface created in the extended cross-section of the larger pipe. A sealing ring can be attached between these contact surfaces, for example, in order to seal this connection even better if necessary, e.g. in the case of high pressures in the pipe system.

With the above-mentioned new principle for connecting the end of a pipe via a hole in the outer surface of another pipe, which generally has a larger cross-section that is circular to elliptical or lens-shaped, it is possible to realize a pipe-in-pipe system in further development of the invention, which does not have the disadvantages of previously known connections mentioned in the introduction to the description.

In this extension, two pipes, which have one or more openings according to the invention, are inserted into each other and by using branch pipes with screw-in pieces of different lengths, a connection of the

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Branch pipes are manufactured with the interior of the respective main pipe.

The connection to the space between the outer main pipe and the inner main pipe is achieved by means of a branch pipe with a short screw-in piece and the connection to the interior of the inner main pipe is achieved by means of a branch pipe with a long screw-in piece.

A further embodiment of the invention is the thermal insulation of the supply and return flows in pipe-in-pipe systems from each other.

For example, the so-called flow of a heating system flows through the inner main pipe and the return flow is therefore in the space between the inner main pipe and the outer main pipe. It makes sense to place the flow in the inner pipe because the flow has the higher temperature and is thermally insulated from the outside air by the return flow flowing around the inner main pipe. In these pipe-in-pipe systems, there is a temperature difference between the inner main pipe and the outer main pipe.
In order to minimize the temperature flow between these two pipes, according to another extension of the invention, which is only possible due to the novel connection principle, an insulating layer is applied to the inner main pipe,

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for example, by pushing on a hose made of a rubber-like material (soft foam, e.g. neoprene), which would be damaged by the welding that is necessary for state-of-the-art pipe-in-pipe systems.
5

Another extension of the invention is its application to parallel main lines (main pipes) that are not plugged into one another. The branch pipes branch off from the main lines using the connection according to the invention (dome-like extensions; branch pipe with bead; screw connection with sealing ring).

These branch pipes have a flexible section, which can be a corrugated pipe, for example, between a fixed point - for example a flange connection - and their connection to the main pipe.

During the pre-assembly of such a distribution system, these branch pipes, which are generally quite short and adjusted to the required length, are first screwed to the respective main pipe away from the connection points, then each main pipe equipped with branch pipes is brought to the area of the connection points and then the free ends of the branch pipes are connected to the relevant connection point. To facilitate assembly and welding, a known assembly aid can be assigned to the flanges.

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If another pipe distributor is to be installed with a main pipe and branch pipes, the flanges of which are to be in the same plane as those of the first pipe system, the first installed main pipe and its branch pipes are bent to the side transversely to the longitudinal axis of the main pipe. The second pipe distributor is then installed in the same way as the first pipe distributor, as described above. For structural reasons, the main pipe and its branch pipes can also be bent to the side, but this time in the other direction. The two systems consisting of a pipe distributor and branch pipes can be supply and return, but also systems with the same flow directions that are run separately for reasons of circuit division.

The invention is explained in more detail below with reference to advantageous embodiments shown schematically in drawings.
Show it:

Figure 1: a pipeline distributor according to the invention with three different embodiments of a dome-like extension;

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Figure 2: the end section of a tapered main pipe with outward-facing collar;

Figure 3a: the pipeline distributor according to the invention with pipe-in-pipe installation;

Figure 3b: a cross-section through the pipe distributor with pipe-in-pipe installation;

Figure 3c: a pipe distributor with pipe-in-pipe assembly and fluid connection of a branch pipe with an inner main pipe;

Figure 4: another variant of the connection described in Figure 3c and

Figure 5: a system of pipe manifolds, with separate

Main pipes for flow and return, where the

flanged ends of the branch pipes, both the flow and the return, in one plane

lay.

Figure 1 shows three different basic forms of a pipe distributor according to the invention. In the middle of the figure, three different pipes 1 are shown in their longitudinal extension.

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see. On the right edge of Figure 1, the section B-B through the unchanged pipe cross-sections can be seen. On the left edge, the sections of the section line A-A through the dome-like extensions 2a, 2b, 2c can be seen. The upper cross-section 2a shows an almost rectangularly extended cross-section.

The figure below shows a U-shaped extended cross-section 2b and the lower figure finally shows a barrel-shaped extended cross-section 2c.

The lines 7 are intended to indicate only the light edges of the deformation. The dome-like extensions 2a, 2b, 2c partly have openings 5, the edges of which are preferably directed into the interior of the tube 1. The openings 5 are provided with a fine thread (not shown).

As can be seen from Figure 1, the dome-like extensions 2a, 2b, 2c are partly only included in the upper pipe half 1o and not in the lower pipe half 1u, but they can also be installed in both pipe halves.

The latter variant has the advantage that a possible one-sided distortion is compensated for by only one-sided chipless deformation. Within the scope of the invention, in the case of a two-sided arrangement of the dome-like extensions 2a, 2b, 2c, their diametrical alignment (i.e. offset by 180 degrees) is not absolutely necessary.

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Depending on the application, different types of dome-like extensions 2a, 2b, 2c may be present on one pipe.

In order to axially couple a pipe 1 to a further pipe, these preferably have a cross-sectional reduction in their end region 1b. A union nut 6 pushed on after the cross-sectional reduction is held on the end region 1b of the pipe 1 by a collar 1c formed without cutting.

A detailed drawing of the tapered end area 1b of a pipe 1 is shown in Figure 2. A union nut 6 (not shown) rests on the left side against a collar 1c (flanged edge). If the union nut 6 is sealed against a continuing pipe, for example by means of a band-shaped sealing material (hemp fibers, sealing tape), a sealing ring 9 is required between the collar of the union nut 6 and the tapered end area. A bead 8 is formed to accommodate this sealing ring 9 (for example an O-ring). However, if the front surface of the continuing pipe is sufficiently flat, a seal 10 (flat seal) can also be used to seal between the right-hand flat surface of the collar 1c and the front surface of the continuing pipe.

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Figure 3a shows the principle of a pipe-in-pipe system 11 with the screw-in branch pipes 12, 13 according to the invention. The screw-in branch pipes 12 are screwed into the outer main pipe 15 on the one hand and simultaneously inserted into the inner main pipe 16 on the other. The flow medium can therefore only flow between the inner main pipe 16 and the branch pipes 12. Since the branch pipe 13 is only screwed into the outer main pipe 15 and is at a distance from the inner main pipe 16, there is only a flow connection between these two. For sealing, the screw-in branch pipes 12 are provided with both a seal 9 (for example an O-ring) - which lies in a bead 4 of the neck of the inner main pipe 16 - and with a seal 9 on the outer main pipe 15. In order for the sealing ring 9 to have a contact surface on the branch pipes 12, 13, these 12, 13 have an outer bead 14. In this embodiment, only the dome-like extensions 2 of the outer main pipe 15 have a fine thread in their opening 5. In order to avoid any significant distortions in the case of different temperatures of the flow media in the inner main pipe 16 and the outer main pipe 15 and the associated different length expansions of these main pipes 15, 16,

Longitudinal stresses and associated embrittlement of the

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material, a corrugated pipe-like pipe section 1d is provided, for example, on the inner main pipe 16.

In general, this pipe-in-pipe system is certainly used to create a forward and return flow. However, it is also conceivable that two parallel flows with different throughputs and/or different temperatures are used.

Instead of an O-ring as seal 9, a pasty sealing compound can also be used, which is preferably set to harden.

For illustration purposes, Figure 3b shows the pipe-in-pipe system 11 in cross section with a branch pipe 13 screwed into the outer main pipe 15. In addition to the elements already described, an insulation 17 can be seen around the inner main pipe 16. This insulation 17 can consist of a hose made of soft foam, for example neoprene. Another screw-in branch pipe 12 that may be located behind this cutting plane has not been shown for reasons of clarity.

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Figure 3c illustrates another important cross-section through the pipe-in-pipe system 11. Here, a screw-in branch pipe 12 can be seen, which is connected to both the inner main pipe 16 and the outer main pipe 15. Compared to Figure 3b, the screw-in branch pipe 12 is also shown being inserted into the inner main pipe 16. The dome-like extension 2b has a bead 4 for receiving a sealing ring 9. The insulation 17 is recessed around the dome-like extension 2b to allow the screw-in branch 12 to pass through.

Figure 4 illustrates a variant of the branch described in Figure 3c. The branch pipe 12 is not inserted into the inner main pipe 16 as in Figure 3c, but is also screwed in. Although this connection point is not necessarily completely sealed, in some applications a small leakage between the inner main pipe 16 and the outer main pipe 15 is technically acceptable. A possible mismatch of the thread starts in the dome-like extension 2b and the branch pipe 12 is compensated for by elasticities in the longitudinal axis of the pipe-in-pipe system 1.

This embodiment shown in Figure 4 is in a sense a "saving" version of the inventive

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Pipe system for pipeline distributors and similar devices.

Figure 5 shows a system of pipe distributors made up of two parallel main pipes 1 that are not plugged into one another. The left part of Figure 5 is a cross-section through the system, while the right part of the figure shows a side view. Screw-in branch pipes 13 branch off from both main pipes 1. The branch pipes 13 have flanges 18 at their ends facing away from the main pipes 1. A corrugated pipe-like pipe section 1d is arranged between the flanges 18 and their screw-in ends (in the right part of Figure 5, the corrugated pipe-like pipe section has not been explicitly highlighted; in the left part of Figure 5, its graphic representation has been greatly simplified). The flanges 18 all lie in one plane 22.

To manufacture this system of pipe distributors, first of all only one row of branch pipes 13 and the associated main pipe 1 is assembled. The branch pipes 13 are cut to the appropriate length and screwed into the pipe 1. Then the free ends of the branch pipes 13, here the flanges 18, can each be connected to a connection point, which are not shown in Fig. 5, because the branch pipes 13 are no longer subject to rotation and the flange has a defined position in relation to its connection point. In addition, the flanges can, e.g. if

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These are welded to the connection point and locked in place with an assembly aid (not shown).
After the aforementioned work steps have been carried out, the pipe 1 is then pivoted together with the branch pipes 13 from the starting position 21 of the plane 22 either in the direction 19 or 20 in order to make room for the assembly of the second main pipe 1 with branch pipes 13. The deformation of the branch pipes 13 during pivoting is plastic.
The second main pipe 1 is installed in the same way as the first main pipe 1.

For the second main pipe 1, pivoting is not absolutely necessary unless one wants to create a system of pipe distributors with a total of three or more main pipes 1.

If no deflection is carried out for the second main pipe 1, the main pipes 1 are so close to each other that they can, for example, be provided with a common thermal insulation.

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Reference list

I Main pipes (main line)

1o upper half of the main pipe

1u lower half of the main pipe

1a Interior of the main pipe 1

1b tapered end section of the main pipe

1c Collar, facing outwards

1d corrugated pipe section

2 dome-like extension

2a rectangular cross-section of the dome-like extension

2b U-shaped cross-section of the dome-like extension

2c barrel-shaped cross-section of the dome-like extension

3 Collaring

4 bead in the neck

5 Opening

6 Union nut

7 Light edge

8 bead
9 Seal

10 Seal (flat seal)

II Pipe-in-pipe system

12 screw-in branch pipes

13 screw-in branch pipes 14 external bead

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15 outer main pipe in pipe-in-pipe system

16 inner main pipe in pipe-in-pipe system

17 Insulation

18 Flange

19 Bending direction

20 Bending direction

21 Starting position

22 Level

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Claims (19)

1. Pipe or pipe system for use in so-called pipeline, heating circuit or boiler distributors or similar devices using pipes with a circular to elliptical or lens-shaped cross-section, characterized in that at least one of the end regions of the pipe ( 1 ) is provided with a collar ( 1c ). 2. Pipe or pipe system according to claim 1, characterized in that the end region of the main pipe ( 1 ) is a tapered end region ( 1b ). 3. Pipe or pipe system according to one of claims 1 or 2, characterized in that a bead ( 8 ) for receiving a seal ( 9 ) is attached in front of the collar ( 1c ) of the end region of the pipe ( 1 ). 4. Pipe or pipe system for use in so-called pipeline, heating circuit or boiler distributors or similar devices using at least one main pipe with a circular to elliptical or lens-shaped cross-section, and at least one branch pipe branching off from the main pipe at a branch, characterized in that the main pipe ( 1 ) or the main pipes ( 1 ) used for a pipe system have at least one cross-sectional widening ( 2 , 2 a, 2 b, 2 c) in the region of the branch at least in the upper ( 10 ) or in the lower ( 1 u) pipe half, which are created by an imaginary horizontal longitudinal pipe section, that this cross-sectional widening ( 2 , 2 a , 2 b , 2 c ) has a radially directed opening ( 5 ) and that this opening ( 5 ) has a necking ( 3 ) directed towards the interior ( 1 a) of the pipe ( 1 ). 5. Pipe or pipe system according to claim 4, characterized in that the cross-sectional extension ( 2 ) has a substantially rectangular cross-section ( 2a ). 6. Pipe or pipe system according to claim 4, characterized in that the cross-sectional extension ( 2 ) has a substantially U-shaped cross-section ( 2b ). 7. Pipe or pipe system according to claim 4, characterized in that the cross-sectional extension ( 2 , 2a , 2b , 2c ) has a substantially barrel-shaped cross-section ( 2c ). 8. Pipe or pipe system according to one of claims 4 to 7, characterized in that different cross-sectional extensions ( 2 , 2a , 2b , 2c ) are provided in a pipe ( 1 ). 9. Pipe or pipe system according to one of claims 4 to 8, characterized in that the cross-sectional extensions ( 2 , 2a , 2b , 2c ) point in different radial directions with respect to the longitudinal axis of the pipe ( 1 ). 10. Pipe or pipe system according to one of claims 4 to 9, characterized in that the cross-sectional extensions ( 2 , 2a , 2b , 2c ) have a fine thread in the neck ( 3 ) of their respective opening ( 5 ). 11. Pipe or pipe system according to one of claims 4 to 9, characterized in that the cross-sectional extensions ( 2 , 2a , 2b , 2c ) have a bead ( 4 ) in the neck ( 3 ) of their respective openings ( 5 ). 12. Pipe or pipe system according to one of claims 4 to 11, characterized in that screwable branch pipes ( 12 , 13 ) are screwed into the necks ( 3 ) of the cross-sectional extensions ( 2 , 2a , 2b , 2c ). 13. Pipe or pipe system according to one of claims 4 to 12, characterized in that, in order to realize a pipe system consisting of at least two mutually parallel main pipes ( 1 ), screw-in branch pipes ( 13 ) each have a corrugated pipe-like pipe section ( 1b ) and the ends of the screw-in branch pipes ( 13 ) facing away from the main pipes ( 1 ) lie in one plane ( 22 ). 14. Pipe or pipe system according to one of claims 4 to 13, characterized in that a sealing ring ( 9 ) is arranged between the contact surface formed on the main pipe ( 1 ) at the receptacle ( 2 , 3 , 5 ) and the screwed-in branch pipe ( 12 , 13 ). 15. Pipe or pipe system according to one of claims 4 to 14, characterized in that a sealing compound is provided between the contact surface formed on the main pipe ( 1 ) at the receptacle ( 2 , 3 , 5 ) and the screwed-in branch pipe ( 12 , 13 ). 16. Pipe or pipe system according to one of claims 4 to 15, characterized in that the screw-in pipe branches ( 12 , 13 ) have an external bead ( 14 ). 17. Pipe or pipe system according to one of claims 4 to 16, characterized in that, in order to realize a pipe-in-pipe system ( 11 ), an inner main pipe ( 16 ) is introduced into an outer main pipe ( 15 ) and screw-in branch pipes ( 12 , 13 ) are screwed at least into the openings ( 5 ) of the outer main pipe ( 15 ) and the screw-in branch pipes ( 12 ) have a flow connection only to the inner main pipe ( 16 ). 18. Pipe or pipe system according to claim 17, characterized in that the inner main pipe ( 16 ) has at least one corrugated pipe-like pipe section ( 1d ). 19. Pipe or pipe system according to one of claims 17 or 18, characterized in that the inner main pipe ( 16 ) is at least partially covered with a heat-insulating layer.