DE202017107801U1 - Thermally insulated pipe - Google Patents

Abstract

Thermally insulated pipe (1) comprising at least one media pipe (2) through which a fluid can flow, an insulating layer (3) adjoining the media pipe (2) on the outside, and an outer jacket (4) adjoining the insulating layer (3) on the outside in the form of a corrugated tube (5), wherein the insulating layer (3) is a closed-cell polymer foam (6) or contains a closed-cell polymer foam (6), and the insulating layer (3) is carried out either uniformly, or a first Dämmschichtabschnitt (3.1) and a to the first Dämmschichtabschnitt (3.1) has different second Dämmschichtabschnitt (3.2), and that the insulating layer (3) at least in sections with the inner surface (7) of the outer shell (4) is firmly connected.

Description

The invention relates to a thermally insulated pipe.

Furthermore, the invention relates to a heat transport network with a thermally insulated pipe.

Thermally insulated pipes are used in particular in local heating networks, where heat energy is to be supplied to a heat consumer by a heat generator. For this purpose, for example, heated fluid, in particular water, passed through thermally insulated pipes, whereby the heat loss in the line can be kept low.

Known are generic thermally insulated pipes, which consist of at least one fluid-conducting pipe, a thermal insulation of, for example, a polymer foam and an outer jacket, which is often designed as a corrugated pipe.

A disadvantage of this design is that in construction site such a tube can be damaged quickly by, for example, the outer shell is pierced. In this case, it can no longer be guaranteed that soil moisture or rainwater or groundwater will penetrate the pipe and impair the thermal insulation effect. In such cases, it can also happen that a heat transport network runs partially or completely full of water and thus becomes unusable, which entails high renovation costs. It is also possible that such a damaged pipe penetrates water into a building and thus causes high damage when the pipe is laid with a slope towards the building.

This is where the invention, whose object is to provide a thermally insulated pipe, which overcomes the disadvantages described by the propagation of water in case of damage to the outer shell is prevented, and ensures sufficient flexibility with high robustness.

Another object of the invention is to provide a heat transport network.

The solution of the first object of the invention is achieved by a thermally insulated pipe according to claim 1. The invention provides a thermally insulated pipe available that at least one media tube, which is traversed by a fluid, an outside of the media tube adjacent insulation layer, and a the outer layer in the form of a corrugated tube surrounds the insulating layer outside, wherein the insulating layer is a closed-cell polymer foam or contains a closed-cell polymer foam, and the insulation layer is either uniform, or has a first Dämmschichtabschnitt and a different first insulation layer section second Dämmschichtabschnitt, and that the Insulating layer is at least partially firmly connected to the inner surface of the outer shell.

By means of this structure of the thermally insulated tube according to the present invention, the above-described disadvantages of the prior art are overcome in the event of damage to the outer jacket, as well as sufficient flexibility combined with good robustness.

In the context of the invention, it can prove to be favorable if it is intended to design the thermally insulated pipe such that the first insulating layer section adjoins the outside of the media pipe and is a part conformed to the outer contour of the media pipe, and the second insulating layer section is a closed-cell polymer foam which is on the outside adjacent to the first Dämmschichtabschnitt. By this measure, a very simple production of a thermally insulated pipe can be made by the form-fitting parts, which are formed, for example, as plates, which are wrapped around the media pipe, can be selected according to the technical and manufacturing needs.

In a very advantageous embodiment of the invention can be provided that in the thermally insulated pipe according to the invention, the ratio of the thickness of the first Dämmschichtabschnitts and the second Dämmschichtabschnitts 15 to 1 to 1 to 15, wherein a ratio of 4 to 1 to 6 to 1 is preferred. This is readily achieved, the thermally insulated pipe to meet exactly the needs of the customer or the requirement of such pipes underlying standards or specifications by the various Dämmschichtabschnitte can be customized and adapted. Moreover, the thermally insulated pipe can be manufactured in a very favorable manufacturing technique, which keeps the cost of manufacturing the thermally insulated pipe low.

In a very advantageous embodiment of the present invention it can be provided that the thermally insulated tube is formed such that the wall of the media tube consists of a polymer material or contains a polymer material which is selected from a polyethylene, in particular a cross-linked polyethylene (PE). X) a polypropylene, a polybutylene, or a metal such as steel. Such materials are extremely inert, stable, durable, easy to mold and inexpensive.

In the present invention, it may prove to be very favorable if it is intended to design the thermally insulated tube so that the closed-cell polymer foam is selected from a polyurethane foam, a polyethylene foam, in particular a cross-linked polyethylene foam, a polypropylene foam, a polystyrene foam or an acrylonitrile foam. butadiene-styrene foam.

The foam is closed cell and therefore protects the functional layers from moisture, e.g. in the soil. Due to the low density (about 0.1 to 0.8 kg / l) and the low thermal conductivity (about 0.02 to 0.10 W / mK) is achieved by the foam, a thermal insulation, which, for. prevents condensation on overflow cold water pipes. The cooling of the media to be transported can be effectively prevented. It is a short-term load with a maximum of 110 ° C possible.

Particularly effective in the present invention may prove to be the thermally insulated tube in such a way that the wall of the outer shell consists of a polymer material or contains a polymer material which is selected from a polyethylene, in particular from a cross-linked polyethylene (PE-X), a polypropylene, or a polybutylene. The outer jacket of the thermally insulated pipe according to the invention consists in a preferred embodiment of the invention of a crosslinked or uncrosslinked polyethylene (PE) or polyethylene copolymers, which is in the form of a corrugated pipe. In an advantageous embodiment, the outer sheath may consist of foamed polyethylene with a density of about 500 kg / m ³ or contain such. This outer sheath is more robust with constant flexibility compared to a non-foamed outer sheath and additionally contributes to the thermal insulation effect.

The invention also includes embodiments which have at least one barrier layer on or in the outer jacket, on or in the insulating layer or on or in a section of the insulating layer or the media tube, which in particular should prevent or prevent the diffusion of oxygen or water vapor or hydrocarbons. These barrier layers may in particular contain polymeric, metallic or inorganic material.

In a further preferred embodiment of the present invention, the thermally insulated tube contains at least one electrically conductive section which serves for leak or moisture detection and / or signal transmission. Thus, a failure of the insulation function, for example by penetrating water, can be reliably detected.

As already described above, it is very important in such thermally insulated pipes to avoid spreading moisture or water in the event of damage to the pipe in order to maintain the thermal insulation of the pipe.

By providing that the free space, in particular the free space at the troughs on the inner surface of the protective tube formed as a corrugated tube at least partially, Favor but is completely filled with the closed-cell polymer material foam, such uncontrolled spreading of moisture or water in the thermally insulated tube is effective be avoided, and so the favorable thermal insulation effect of the tube can be maintained.

In a further preferred embodiment of the thermally insulated pipe can be advantageously provided that the insulating layer with the entire inner surface of a wave trough of the outer shell, but at least more than 10% of the inner surface of a wave trough of the outer shell, is firmly connected. By this measure, a particularly secure barrier against the uncontrolled spreading of moisture or water in the thermally insulated pipe is constructed.

In the present invention, it can prove to be extremely advantageous if it is provided that the thermally insulated pipe is produced in a co-extrusion process or a post-coextrusion process or a multi-stage process.

Such a coextrusion method for producing the thermally insulated tube of the present invention can be carried out in particular in several steps. Thus, in a first step, a media tube can be provided by an extrusion process, which is enveloped in a second step by a thermal insulation material. As a thermal insulation material, for example, a plate of a foamed polymer material can be wrapped around the media tube and glued or welded, for example, at the abutting edges. But there are also other techniques of wrapping the media tube with a thermal insulation material possible. In a third step, the outer shell can be arranged by an extrusion process and a polymer foam can be applied to the thermal insulation material.

The thermally insulated pipe of the present invention can thus be provided in a particularly simple and quick as well as inexpensive production technique.

In an alternative manufacturing technique it can be provided that the outer sheath and / or the media tube and / or the closed-cell polymer foam is wholly or partly produced by a manufacturing process, wherein the manufacturing process is a generative powder bed process, in particular selective laser melting (SLM), selective laser sintering (SLS ), selective heat sintering (SHS), electron beam melting (EBM / Electron Beam Additive Manufacturing - EBAM) or binder compounding (Binder Jetting). The manufacturing process can be a generative free-space process, in particular, hardfacing, wax deposition modeling (WDM), contour crafting, metal powder application (MPA), plastic powder coating, cold gas spraying, electron beam welding (EBW) or melt coating techniques such as fused deposition Modeling (FDM) or Fused Filament Fabrication (FFF). The manufacturing process may include a generative liquid material process, particularly stereolithography (SLA), Digital Light Processing (DLP), Multi Jet Modeling (MJM), Polyjet Modeling or Liquid Composite Molding (LCM). Furthermore, the manufacturing method may include other generative layer building methods, in particular Laminated Object Modeling (LOM), 3D screen printing or light-controlled electrophoretic deposition.

In the multi-layered pipe of the present invention, it may be found to be very favorable if it is provided that the outer shell and / or the media tube and / or the closed-cell polymer foam consists of a polymer material or contains a polymer material, wherein the polymer material is preferably a thermoplastic, and more preferably a polyolefin such as a polypropylene or a polyethylene or a polybutylene, or a copolymer of the foregoing, or a crosslinked polyolefin, especially a crosslinked polyethylene, or a polyvinyl chloride, or a polyurethane.

The second object of the invention is achieved by the subject matter of claim 8. A heat transport network is then improved over that of the prior art, if it is provided that a thermally insulated pipe, as described above, is used for its construction. Such a heat transport network is improved or protected in particular in terms of stability, durability and the spread of moisture or water in the polymer foam.

The thermally insulated pipe according to the invention can be used in heating networks, in construction, in food technology, in medical technology, in pharmaceutical technology, in agriculture, in fish farming or in power plant technology.

Application finds the thermally insulated pipe of the present invention in the transport of a fluid as a heat carrier in local and district heating networks. There are also other fields of application in industry, in the beverage and food industry, in agriculture and in other areas.

Further important features and advantages of the invention will become apparent from the subclaims, from the figures and from the associated description of the figures.

It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination given, but also in other combinations or in isolation, without departing from the scope of the present invention.

The present invention will be explained in more detail with reference to the attached figures as follows.

• 1 eine schematische Querschnittsansicht eines thermisch gedämmten Rohrs gemäß der vorliegenden Erfindung in einer ersten Ausführung;
• 2 eine schematische Querschnittsansicht eines thermisch gedämmten Rohrs gemäß der vorliegenden Erfindung in einer zweiten Ausführung;
• 3 eine seitliche Schnittansicht eines thermisch gedämmten Rohrs gemäß vorliegender Erfindung in einer ersten Ausführung;
• 4 eine seitliche Schnittansicht eines thermisch gedämmten Rohrs gemäß vorliegender Erfindung in einer zweiten Ausführung;
• 5 eine seitliche Schnittansicht eines thermisch gedämmten Rohrs gemäß vorliegender Erfindung in einer dritten Ausführung;
• 6 eine seitliche Schnittansicht eines thermisch gedämmten Rohrs gemäß vorliegender Erfindung in einer vierten Ausführung.

This shows:

• 1 a schematic cross-sectional view of a thermally insulated pipe according to the present invention in a first embodiment;
• 2 a schematic cross-sectional view of a thermally insulated tube according to the present invention in a second embodiment;
• 3 a side sectional view of a thermally insulated tube according to the present invention in a first embodiment;
• 4 a side sectional view of a thermally insulated tube according to the present invention in a second embodiment;
• 5 a side sectional view of a thermally insulated tube according to the present invention in a third embodiment;
• 6 a side sectional view of a thermally insulated tube according to the present invention in a fourth embodiment.

In the 1 is a schematic cross-sectional view of a thermally insulated pipe 1 according to the present invention shown in a first embodiment.

The thermally insulated pipe 1 includes a media tube 2 , which is traversed by a fluid. The media tube 2 comes about centrally in the thermally insulated pipe 1 to lie.

To the media tube 2 is externally adjacent an insulating layer 3 arranged.

At the insulation layer 3 Finally, outside is an outer jacket 4 in the form of a corrugated pipe 5 educated. The insulating layer 3 contains a closed-cell polymer foam 6 ,

On the outer surface of the media tube 2 is a first layer of insulation 3.1 arranged in the form of sheets of a foamed polymer material surrounding the media tube 2 are laid out, trained. The abutting edges of the sheets of foamed polymeric material which comprise the first layer of insulation 3.1 form, are glued or welded together at their abutting edges.

In the space between the first layer of insulation 3.1 and the inner surface 7 of the outer jacket 4 is a closed-cell polymer foam 6 containing the second insulation layer section 3.2 forms.

The insulating layer 3 is with the inner surface 7 of the outer jacket 4 firmly connected.

In the 2 is a schematic cross-sectional view of a thermally insulated pipe 1 according to the present invention shown in a second embodiment.

The reference numerals in 2 match those out 1 ,

The thermally insulated pipe 1 includes a media tube 2 , which is traversed by a fluid. The media tube 2 is approximately centric in the thermally insulated pipe 1 added.

To the media tube 2 is externally adjacent an insulating layer 3 arranged.

At the insulation layer 3 Finally, outside is an outer jacket 4 in the form of a corrugated pipe 5 educated. The insulating layer 3 contains a closed-cell polymer foam 6 ,

The insulating layer 3 is with the inner surface 7 of the outer jacket 4 firmly connected.

In the 3 is a schematic side sectional view of a thermally insulated pipe 1 according to the present invention shown in a first embodiment.

The reference numerals in 3 correspond to those of the preceding figures.

The outer jacket 4 of the thermally insulated pipe 1 is as corrugated pipe 5 formed, with troughs 8th and wave mountains 9 are provided in a regular alternating arrangement.

In the space between the first layer of insulation 3.1 and the inner surface 7 of the outer jacket 4 is a closed-cell polymer foam 6 containing the second insulation layer section 3.2 forms.

The insulating layer 3 is with the inner surface 7 in the area of troughs 8th of the outer jacket 4 firmly connected.

In the 3 is still a schematic device 10 shown for the preparation of the thermally insulated pipe 1 is used. The device 1 includes means, a media tube 2 to produce, in particular such a media tube 2 by an extrusion process, further means, the first dam layer section 3.1 , For example in the form of plates around the media tube 2 To put around and weld the abutting edges of the plates, further means, the outer jacket 4 for example, by forming it in an extrusion process and shaping it into a corrugated tube by means of a corrugator, and finally by means of the polymer foam 6 as a second dam layer section 3.2 in the space between the first layer of insulation 3.1 and the inner surface 7 of the outer jacket 4 contribute.

It goes without saying that more funds in the device 10 can be provided, the generated thermally insulated pipe 1 For example, to mark, label, cut or otherwise edit.

In the 4 is a schematic side sectional view of a thermally insulated pipe 1 according to the present invention shown in a second embodiment.

The reference numerals in 4 correspond to those of the preceding figures.

Opposite the thermally insulated pipe 1 to 3 Here is just a uniform layer of insulation 3 containing a closed-cell polymer foam 6 contains trained. The insulating layer 3 is with the inner surface 7 of the outer jacket 4 firmly connected.

In the 4 is still a schematic device 10 shown for the preparation of the thermally insulated pipe 1 is used. The device 1 includes means, a media tube 2 to produce, in particular such a media tube 2 produced by an extrusion process, further means, the outer shell 4 for example, by forming it in an extrusion process and shaping it into a corrugated tube by means of a corrugator, and finally by means of the polymer foam 6 in the space between the media tube 2 and the inner surface 7 of the outer jacket 4 contribute. It goes without saying that more funds in the device 10 can be provided, the generated thermally insulated pipe 1 For example, to mark, label, cut or otherwise edit.

In the 5 is a schematic side sectional view of a thermally insulated pipe 1 according to the present invention shown in a third embodiment.

The reference numerals in 5 correspond to those of the preceding figures.

The thermally insulated pipe 1 according to 5 is initially constructed like the thermally insulated pipe 1 according to 1 and 3 but no polymer foam 6 is provided.

The outer jacket 4 in the form of a corrugated pipe 5 is designed such that sections 11 of the outer jacket 4 are provided, where no troughs 8th and wave mountains 9 are formed, but the "smooth" are executed and have a reduced diameter. These sections may preferably alternate regularly with the areas, the troughs 8th and wave mountains 9 may be formed, in particular, the sections 11 to their respective adjacent sections 11 be equally spaced. However, other embodiments are possible that do not equidistant to the respective adjacent sections 11 respectively.

Due to the thermally induced shrinkback during the extrusion of the outer jacket 4 it happens that the inner surface 7 in the area of the section 11 to the outside of the insulating layer 3 in the form of around the media tube 2 laid around plates, firmly applies and advantageously by the hot polymer material, a firm connection between the inner surface 7 and the outside of the insulating layer 3 arises.

In the 5 is still a schematic device 10 shown for the preparation of the thermally insulated pipe 1 is used. The device 1 includes means, a media tube 2 to produce, in particular such a media tube 2 to produce by an extrusion process, further means, a dam layer 3 , For example in the form of plates around the media tube 2 To put around and weld the abutting edges of the plates, further means, the outer jacket 4 for example, by forming it in an extrusion process and forming it into a corrugated pipe by means of a corrugator. The corrugator has known shape jaws on which the contour of the corrugated pipe 5 form. In the mold jaws of the corrugator is provided that they are chosen such that the above-described sections 11 can be formed. It goes without saying that more funds in the device 10 can be provided, the generated thermally insulated pipe 1 For example, to mark, label, cut or otherwise edit.

In the 6 is a schematic side sectional view of a thermally insulated pipe 1 according to the present invention shown in a fourth embodiment.

The reference numerals in 6 correspond to those of the preceding figures.

Opposite the thermally insulated pipe 1 to 5 has the thermally insulated pipe described here 1 the first layer of insulation 3.1 in the known and described embodiment on and in the space between the first Dämmschichtabschnitt 3.1 and the inner surface 7 of the outer jacket 4 a closed-cell polymer foam 6 , the second layer of insulation 3.2 forms.

In the 6 is still a schematic device 10 shown for the preparation of the thermally insulated pipe 1 is used. The device 1 includes means, a media tube 2 to produce, in particular such a media tube 2 by an extrusion process, further means, the first dam layer section 3.1 , For example in the form of plates around the media tube 2 To put around and weld the abutting edges of the plates, further means, the outer jacket 4 for example, by forming it in an extrusion process and shaping it into a corrugated tube by means of a corrugator, and finally by means of the polymer foam 6 as a second dam layer section 3.2 in the space between the first layer of insulation 3.1 and the inner surface 7 of the outer jacket 4 contribute. The corrugator has known shape jaws on which the contour of the corrugated pipe 5 form. In the mold jaws of the corrugator is provided that they are chosen such that the above-described sections 11 can be formed. It goes without saying that more funds in the device 10 can be provided, the generated thermally insulated pipe 1 For example, to mark, label, cut or otherwise edit.

The insulating layer 3 is with the inner surface 7 of the outer jacket 4 in the field of sections 11 firmly connected.

In this way, it is easy to achieve a thermally insulated pipe 1 to provide in different forms available, which can be provided in a particularly simple and faster and less expensive manufacturing technology and the spread of water in the insulating layer 3 in case of damage.

LIST OF REFERENCE NUMBERS

1

thermally insulated pipe

2

medium pipe

3

damp course

3.1

first layer of insulation

3.2

second layer of insulation

4

outer sheath

5

corrugated pipe

6

polymer foam

7

inner surface

8th

trough

9

Wellenberg

10

device

11

section

20

Heat transport network

Claims (8)

Thermally insulated pipe (1) comprising at least one media pipe (2) through which a fluid can flow, an insulating layer (3) adjoining the media pipe (2) on the outside, and an outer jacket (4) adjoining the insulating layer (3) on the outside in the form of a corrugated tube (5), wherein the insulating layer (3) is a closed-cell polymer foam (6) or contains a closed-cell polymer foam (6), and the insulating layer (3) is carried out either uniformly, or a first Dämmschichtabschnitt (3.1) and a to the first Dämmschichtabschnitt (3.1) has different second Dämmschichtabschnitt (3.2), and that the insulating layer (3) at least in sections with the inner surface (7) of the outer shell (4) is firmly connected. Thermally insulated pipe (1) after Claim 1 , characterized in that the first Dämmschichtabschnitt (3.1) on the outside of the media tube (2) is adjacent and on the outer contour of the media tube (2) form adapted part, and that the second Dämmschichtabschnitt (3.2) is a closed-cell polymer foam, the outside of the first Insulating layer section (3.1) adjacent. Thermally insulated pipe (1) after Claim 1 or 2 , characterized in that the ratio of the thickness of the first Dämmschichtabschnitts (3.1) and the second Dämmschichtabschnitts (3.2) is 15 to 1 to 1 to 15, wherein a ratio of 4 to 1 to 6 to 1 is preferred. Thermally insulated pipe (1) according to one of the preceding claims, characterized in that the wall of the media pipe (2) consists of a polymer material or contains a polymer material which is selected from a polyethylene, in particular from a cross-linked polyethylene (PE-X), a polypropylene, a polybutylene, or a metal such as steel. Thermally insulated pipe (1) according to one of the preceding claims, characterized in that the closed-cell polymer foam (6) is selected from a polyurethane foam, a polyethylene foam, in particular a cross-linked polyethylene foam, a polypropylene foam, a polystyrene foam or an acrylonitrile-butadiene-styrene foam , Thermally insulated pipe (1) according to one of the preceding claims, characterized in that the wall of the outer casing (4) consists of a polymer material or contains a polymer material which is selected from a polyethylene, in particular from a cross-linked polyethylene (PE-X), a polypropylene, or a polybutylene. Thermally insulated pipe (1) according to one of the preceding claims, characterized in that the insulating layer (3) with the entire inner surface (7) of a wave trough (8) of the outer shell (4), but at least more than 10% of the inner surface (7 ) of a wave trough (8) of the outer sheath (4) is firmly connected. Heat transport network (20) with at least one thermally insulated pipe (1) according to one of Claims 1 to 7 ,

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