EP4673678A1 - Conduite isolée - Google Patents

Conduite isolée

Info

Publication number
EP4673678A1
EP4673678A1 EP24707497.4A EP24707497A EP4673678A1 EP 4673678 A1 EP4673678 A1 EP 4673678A1 EP 24707497 A EP24707497 A EP 24707497A EP 4673678 A1 EP4673678 A1 EP 4673678A1
Authority
EP
European Patent Office
Prior art keywords
layer
vacuum insulation
inner pipes
layers
insulated pipe
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP24707497.4A
Other languages
German (de)
English (en)
Inventor
Tero Juurinen
Antti HELMINEN
Stefan Slotte
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Uponor Innovation AB
Original Assignee
Uponor Innovation AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Uponor Innovation AB filed Critical Uponor Innovation AB
Publication of EP4673678A1 publication Critical patent/EP4673678A1/fr
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L59/00—Thermal insulation in general
    • F16L59/06—Arrangements using an air layer or vacuum
    • F16L59/065—Arrangements using an air layer or vacuum using vacuum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L59/00—Thermal insulation in general
    • F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
    • F16L59/026—Mattresses, mats, blankets or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L59/00—Thermal insulation in general
    • F16L59/14—Arrangements for the insulation of pipes or pipe systems
    • F16L59/143—Pre-insulated pipes

Definitions

  • the present application relates to an insulated pipe , in particular to a vacuum insulated pipe for local heat distribution .
  • pre-insulated pipes for distribution of warm drinking water or for heating supply networks in di f ferent building types , among them hotel complexes , industrial facilities and single family houses as well as multi storage buildings .
  • Such pipes may be used to supply heat from the local boiler or a remote heating system .
  • Vacuum-insulated pipes are , for example , known from WO 95/ 00797 Al , WO 17144609 , and EP 3354559 .
  • the obj ect of the present invention is to provide an insulated pipe having a very low thermal conductivity while being robust .
  • an insulated pipe comprising : - one or more inner pipes
  • the second layer is arranged above the first layer, and the first and the second layer are arranged concentrically around at least one of the one or more inner pipes .
  • the layers comprising vacuum insulation panels overlap each other .
  • each vacuum insulation panel has at least one seam allowing to j oin the vacuum insulation panel to a neighboring vacuum insulation panel in the same layer .
  • Using two or more layers comprising vacuum insulation panels arranged as speci fied directly above reduces heat losses compared with using only one layer of vacuum insulation panels . Further, the vacuum insulation panels can be made thinner while still providing an enhanced overall insulation against heat loss . Thinner vacuum insulation panels are easier to wrap around the pipe or first layer comprising vacuum insulation panels , and pipe bending characteristics are better retained .
  • an outer layer comprising vacuum insulation panels forms protection to the inner layer . I f an outer panel gets punctured, the inner layer ( s ) can still retain the vacuum and the very low thermal conductivity .
  • the second layer overlaps the first layer such that the seams of the vacuum insulation panels comprised in the second layer are radially and longitudinally not at the same place as the seams of the vacuum insulation panels comprised in the first layer .
  • the second layer overlaps the first layer such that the seams of the vacuum insulation panels comprised in the second layer are radially and longitudinally not at the same place as the seams of the vacuum insulation panels comprised in the first layer, heat loss through panel seams is reduced .
  • the insulated pipe comprises one or more further layers , each comprising vacuum insulation panels j oined to each other .
  • the one or more further layers are arranged concentrically around at least one of the one or more inner pipes and above the first and the second layer .
  • the one or more further layers overlap the second layer and also the first layer .
  • the seams of the vacuum insulation panels comprised in the one or more further layers are radially and longitudinally not at the same place as the seams of the vacuum insulation panels comprised in the second layer and/or first layer and/or one or more of the one or more further layers .
  • the vacuum insulation panels comprised in the first layer have a higher insulation property against one member selected from the group consisting of heat , humidity, oxygen, and a combination thereof and/or the vacuum insulation panels comprised in the first layer are more resistant against aging compared with the vacuum insulation panels comprised in the second layer and/or in the one or more further layers .
  • the innermost layer comprising vacuum insulation panels is exposed to the highest temperatures and it lowers the temperature signi ficantly .
  • the overlapping layers comprising vacuum insulation panels have a longer li fetime than the inner layer ( s ) .
  • This of fers possibilities to use a di f ferent type of vacuum insulation panels ( core materials and envelope ) in the outer layers can provide cost savings and/or enhanced insulation .
  • the vacuum insulation panels comprised in at least one of the first layer, the second layer, and one or more further layers are j oined to each other by using a method selected from the group consisting of sewing, gluing, laminating, taping, and a combination thereof .
  • the insulated pipe further comprises a fastening means comprising a plastic film that is wound independently around at least one inner pipe outside of the first layer and/or the second layer and/or one or more of the further layers comprising the flexible vacuum insulation panels and preferably inside of the one or more insulation layers in the form of a helical curve for preventing the longitudinal movement of each of the one or more inner pipes with respect to the vacuum insulation panels .
  • a fastening means comprising a plastic film that is wound independently around at least one inner pipe outside of the first layer and/or the second layer and/or one or more of the further layers comprising the flexible vacuum insulation panels and preferably inside of the one or more insulation layers in the form of a helical curve for preventing the longitudinal movement of each of the one or more inner pipes with respect to the vacuum insulation panels .
  • the insulated pipe comprises two or more inner pipes and further comprises a fastening means comprising a plastic film that is wound around the two or more inner pipes outside of the first layer and/or the second layer and/or one or more of the further layers comprising the flexible vacuum insulation panels in the form of a helical curve and arranged to surround both of the inner pipes together for preventing the longitudinal movement of the inner pipes with respect to each other .
  • a fastening means comprising a plastic film that is wound around the two or more inner pipes outside of the first layer and/or the second layer and/or one or more of the further layers comprising the flexible vacuum insulation panels in the form of a helical curve and arranged to surround both of the inner pipes together for preventing the longitudinal movement of the inner pipes with respect to each other .
  • At least one of , preferably all of , the one or more inner pipes , one or more insulation layers , and the outer j acket comprise , preferably consist of , a plastic .
  • the plastic is a polymer, preferably a polyolefine .
  • the polyolefine preferably used for the inner pipe is not limited . It is possible to use non-crosslinked polyolefines .
  • the non-cross linked polyolefines are selected from the group consisting of polyethylene , preferably PE-RT ( Polyethylene of Raised Temperature resistance ) , polypropylene , preferable PPR ( about 5% PE in the molecular chain of PP random uni form polymer ( random copolymer ) , polybutylene terephthalate ( PBT ) , and mixtures thereof .
  • a cross-linked polyolefine can be used .
  • PEX cross-linked polyethylene
  • HDPE high density polyethylene
  • PEX contains cross-linked bonds in the polymer structure , changing the thermoplastic to a thermoset .
  • Cross-linking is accomplished during or after the extrusion of the tubing .
  • the degree of cross-linking is preferably between 60 and 90% .
  • a higher degree of cross-linking could result in brittleness and stress cracking of the material while a lower degree of cross-linking could result in an inner pipe with poorer physical properties .
  • the crosslinking degree is set in accordance with ASTM Standard F876 or ISO 15875.
  • Cross-linked polyethylene (PEX) is the preferred material for the one or more inner pipes due to its material properties, in particular flexibility and high-temperature resistance.
  • the one or more inner pipes may be reinforced and thus may comprise a reinforcement material and a plastic.
  • the reinforcement material can be inorganic or organic.
  • organic fibers for example, it is possible to use organic fibers as reinforcement material.
  • the one or more inner pipes may be multi-layer pipes, preferably comprising one or more diffusion barrier layers, such as an aluminum layer.
  • the diffusion barrier is made of a material comprising, preferably consisting of, a member selected from the group consisting of ethylene vinyl alcohol (EVOH) , aluminum foil, and a combination thereof.
  • EVOH ethylene vinyl alcohol
  • the insulated pipe further comprises a diffusion barrier between the one or more inner pipes and the flexible vacuum insulation panel.
  • the diffusion barrier can be comprised within the vacuum insulation panel.
  • the diffusion barrier can be comprised within the envelope of the vacuum insulation panel.
  • the diffusion barrier is preferably resistant to humidity.
  • an aluminum foil can be used for the diffusion barrier.
  • a layer of ethylene vinyl alcohol (EVOH) which is a formal copolymer of ethylene and vinyl alcohol, can be used as the diffusion barrier.
  • the EVOH-layer prevents oxygen from entering the fluids inside the pipe and thus potentially causing corrosion on radiators. It is possible to extrude the diffusion barrier on the inner pipe.
  • the di f fusion barrier is made of a material comprising, preferably consisting of , selected from the group consisting of ethylene vinyl alcohol (EVOH) , aluminum foil , and a combination thereof .
  • the vacuum insulation panels comprise an envelope and a core .
  • the core comprises insulating materials or inert fillers and is completely encapsulated by the envelope .
  • the envelope has maximum impermeability to gases and is very substantially evacuated .
  • the material for the envelope has very low gas di f fusion values so that once the vacuum has been applied it is retained for the maximum time .
  • the vacuum insulation panels are j oined to each other for producing layers comprising vacuum insulation panels .
  • the j ointing of the vacuum insulation panels may be done by securing the seams of the vacuum insulation panels together, preferably by using a method selected from the group consisting of sewing, gluing, laminating or taping and a combination thereof .
  • the vacuum insulation panels may comprise prepressed silica .
  • the core of the vacuum insulation panel comprises a powdery material , such as powder of inorganic oxides . Processes for producing such VIPs having a core comprising powdery material are known, for example , from WO 2014 / 183814 Al .
  • the layers comprising vacuum insulation panels preferably have a thickness from 5 to 40 mm, more preferably 5 to 35 mm, most preferred 8 to 30 mm .
  • the U-value of the VIP is preferably below 0 . 3 W/ (m 2 K) , more preferably below 0 . 25 W/ (m 2 K) .
  • the width of the layers comprising vacuum insulation panels is preferably about the same as the pipe circumference , so that one web of VIP-panels surrounds the inner pipe .
  • the width can be 300- 1300mm .
  • There can be a gap between the ends of each layer surrounding the inner pipe but preferably each layer overlaps at the ends of each layer surrounding the inner pipe or more preferably there is no gap between the ends .
  • the envelope of the vacuum insulation panel comprises one or more layers , preferably multiple layers , each comprising, preferably consisting of , a material selected from the group consisting of metalli zed foil , polyester, polyamide , ethylene-vinylalcohol-copolymer and a combination thereof , preferably metalli zed foil .
  • aluminum foil contains -for the same area, 21 times more aluminum compared to metalli zed film .
  • aluminum possesses a high heat conductivity .
  • the metalli zed foil is preferred in view of the heat conductivity .
  • Ethylene- vinylalcohol-copolymer layers are preferred in view of the aging characteristerics .
  • the core of the vacuum insulation panel comprises inorganic oxides in the form of a powder, preferably silica powder, more preferably fumed silica powder .
  • a powder of inorganic oxides is preferred because it improves the flexibility of the VIP, particularly in comparison to prepressed silica.
  • Silica is preferred as it is more resistant to ageing (i.e. a pressure increase due to the indiffusion of gasses increases the lamba at a slower rate for the silica powder due to its nano-structure) .
  • silica has a small pore size and thus is not as pressure sensitive as, for example, glass fiber. Therefore, silica is suitable for long term applications, especially at elevated temperatures, when the diffusion is more rapid.
  • Fumed silica also known as pyrogenic silica because it is produced in a flame, consists of microscopic droplets of amorphous silica fused into branched, chainlike, three-dimensional secondary particles which then agglomerate into tertiary particles. The resulting powder has an extremely low bulk density and high surface area. Fumed silica is made from flame pyrolysis of silicon tetrachloride or from quartz sand vaporized in a 3000 °C electric arc. Major global producers are Evonik (Aerosil®) , Cabot Corporation (Cab-O-Sil®) , Wacker Chemie (HDK®) , Dow Corning, and OCI (Konasil®) .
  • Fumed silica is particularly preferred because VIPs comprising fumed silica degrade about 100 times slower than glass fiber panels, and are therefore preferable for elevated temperature applications.
  • the core of the VIP can comprise fumed silica, IR opacifiers, and a small amount of organic fibers.
  • the core material is preferably non-combustible . It is preferably sealed in a high gas barrier film and an extra glass fibre textile for mechanical shock protection.
  • the insulated pipe further comprises one or more, preferably foamed, insulation layers beneath the outer jacket.
  • the insulation layer may comprise, preferably consist of, one material selected from the group consisting of polyethylene (PE) , cross-linked polyethylene (PEX) , polypropylene (PP) , polyurethane (PUR) , and aerogel. It is preferred to use, preferably cross-linked, polyethylene foam or polyurethane. Most preferred is cross-linked closed-cell polyethylene foam. In view of a diminished brittleness, cross-linked or noncross-linked polyethylene foam is preferred. This flexible layer ensures that the temperature of the VIP will not be too high during the processing of the outer jacket and also provides for mechanical protection of the VIP.
  • the flexible layer provides for thermal insulation / mechanical protection of the VIP panel during processing (i.e. the high temperatures that the VIP will be exposed to when the outer plastic layer is extruded on the outside of the pipe) .
  • This enables continuous production of pipe.
  • Another function is mechanical protection of the VIP and and thermal insulation.
  • the PEX-foam has a lower humidity uptake than the PE-foam.
  • the insulated pipe may further comprise one or more spacer between the vacuum insulation panel and the outer jacket, preferably made of a foamed polymer.
  • the foamed polymer may be selected from the materials listed for the insulation layer ( s ) .
  • the outer jacket is corrugated.
  • the corrugation enhances the ring stiffness of the piping element.
  • the outer jacket comprises, preferably consists of, polyethylene of high density (HDPE) , in particular corrugated polyethylene of high density (HDPE) .
  • a method for manufacturing an insulated pipe according to the first aspect comprising: - providing one or more inner pipes ,
  • each vacuum insulation panel has at least one seam that j oins the vacuum insulation panel to a neighboring vacuum insulation panel in the same layer .
  • the method for manuf cturing an insulated pipe comprises winding plastic film, thus producing a fastening comprising a plastic film, independently around at least one inner pipe outside of the first layer and/or the second layer and/or one or more of the further layers comprising the flexible vacuum insulation panels and preferably inside of the one or more insulation layers in the form of a helical curve for preventing the longitudinal movement of each of the one or more inner pipes with respect to the first layer and/or the second layer and/or one or more of the further layers and/or, wherein the insulated pipe comprises two or more inner pipes , winding plastic film , thus producing a fastening means made up of plastic film, around two or more inner pipes outside the first layer and/or the second layer and/or one or more of the further layers and preferably inside of the one or more insulation layers in the form of a helical curve and arranging plastic film to surround two or more of the inner pipes together for preventing the longitudinal movement of the inner pipes with respect to each other .
  • an apparatus for manufacturing the insulated pipe according to the first aspect of the present invention comprising : -means for feeding longitudinal components , wherein the longitudinal components comprise an inner pipe , a first layer, a second layer and optionally one or more of further layers , each layer comprising vacuum insulation panels , wherein the layers are arranged above each other and concentrically around one or more of the at least one inner pipe , -means for arranging one or more insulation layers preferably outside the first layer and/or the second layer and/or one or more of the further layers , -an extruder and a corrugator for forming an outer j acket outside the longitudinal components and the one or more insulation layers , and -optionally means for arranging a fastening means comprising plastic film in the form of a helical curve to the longitudinal components to touch at least one of the longitudinal components in such a manner that the fastening means prevents the longitudinal movement of the longitudinal components with respect to each other .
  • the apparatus comprises a means for arranging a fastening means for winding plastic film in the form of a helical curve independently around at least one inner pipe outside the first layer and/or the second layer and/or one or more of the further layers and preferably inside of the one or more insulation layers in the form of a helical curve for preventing the longitudinal movement of each of the one or more inner pipes with respect to the first layer and/or the second layer and/or one or more of the further layers and/or, wherein the insulated pipe comprises two or more inner pipes , winding plastic film, thus producing a fastening means comprising plastic film around two or more inner pipes outside the first layer and/or the second layer and/or one or more of the further layers and preferably inside of the one or more insulation layers in the form of a helical curve for preventing the longitudinal movement of the inner pipes with respect to each other .
  • Fig . 1 shows an apparatus for producing an insulated pipe according to the present invention .
  • Figs . 2A shows a cross-section of the insulated pipe .
  • Fig . 2B shows an exploded view of the insulated pipe .
  • Fig . 2C shows another cross-section of the insulated pipe containing an encirclement of detail A.
  • FIG. 2D shows detail A of Fig . 2C in a 2- fold magni fication .
  • Figure 1 shows an apparatus for manufacturing a piping element or insulated pipe 10 , wherein Figure 2 shows the individual layers of the piping element 10 .
  • the inner pipe ( s ) 11 is/are manufactured in advance and wound into coils .
  • the apparatus thus comprises means 1 for feeding the inner pipe ( s ) 11 from the coils .
  • the inner pipes 11 are fed through a winding device 3 , in which a first layer 12 comprising vacuum insulation panels 13 ( in this speci fication, the term “vacuum insulation panel” is also referred to as “VIP” ; and the term “vacuum insulation panels” is also referred to as “VIPs” ) fed from means 2 is wound around the inner pipe ( s ) 11 .
  • VIP vacuum insulation panel
  • VIPs vacuum insulation panels
  • the winding device 4 winds the plastic film roll around the inner pipes 11 , the plastic film settles on the first layer 12 comprising VIPs 13 around the pipes 11 in the form of a helical curve or spiral .
  • the plastic film is wound tightly on the first layer 12 comprising VIPs 13 and independently around at least one or more of the inner pipes 11 outside the first layer 12 comprising VIPs 13 and inside of the second layer 14 comprising VIPs 15 and also inside of the one or more insulation layers 16 in the form of helical curve for preventing the longitudinal movement of each of the one or more inner pipes 11 with respect to the first layer 12 comprising VIPs 13 .
  • a second layer 14 comprising VIPs 15 fed from means 2 ' is wound around the first layer 12 comprising VIPs 13 secured by the plastic film wound around the pipes 11 in the form of a helical curve or spiral .
  • plastic film is wound over the second layer 14 comprising VIPs 15 . Because the inner pipes 11 move continuously forward in the apparatus , i.e. to the left in Figure 1, and the winding device 4' winds the plastic film roll around the inner pipes 11, the plastic film settles on the second layer 14 comprising VIPs 15 in the form of a helical curve or spiral.
  • the plastic film is wound tightly on the second layer 14 comprising VIPs 15 and inside of the one or more insulation layers 16 in the form of a helical curve for preventing the longitudinal movement of each of the one or more inner pipes 11 with respect to the first layer 12 comprising VIPs 13 and the second layer 14 comprising VIPs 15.
  • the plastic film may be wound around the two or more inner pipes 11 outside at least one of the layers comprising VIPs and inside of the one or more insulation layers 16 in the form of helical curve thus arranging the plastic film to surround the two or more inner pipes 11 together for preventing the longitudinal movement of the inner pipes 11 with respect to each other.
  • the insulating layer (s) 16 is/are prefabricated insulators in a sheet-like form on a coil 5. From the coil 5, the insulating layers 13, 14 are fed through a wrapping device 5, in which the insulating layer (s) 16 is/are wrapped around the layers (12, 14) comprising VIPs (13, 15) secured by the plastic film. The sides of the insulating layer (s) 16 are joined with a welding device (not shown) . The seam formed by the two sides of each of the insulating layer (s) 16 placed against each other is, for instance, melted closed with hot air in such a manner that the insulating layer (s) 16 completely surround the inner pipes 11. The welding device can also melt the seam closed in some other manner known per se than by utilizing hot air. Instead of the welding device, the sides of the insulating layer (s) 16 can also be joined with a gluing device, for instance.
  • the inner pipes 11 comprising the layers (12, 14) comprising VIPs (13, 15) secured by the plastic film and the insulating layer (s) 16 wrapped around them are led through the die 7 of an extruder 6.
  • the extruder 6 and die 7 extrude outside the insulating layer (s) 16 a plastic layer, from which the corrugated outer jacket 17 is formed for the insulated pipe 10 in the corrugator 8.
  • the corrugator 8 has two sets of moving chill molds in a manner known per se. The structure and operation of the extruder 6, die 7 and corrugator 8 are not described in more detail herein, because they are fully known to a person skilled in the art.
  • the insulated pipe 10 has a corrugated outer jacket 17. Inside the outer jacket 17, there is/are insulating layer (s) 16. Inside the insulating layer (s) 16, there are longitudinal components comprising inner pipe 11 and layers 12, 14 comprising VIPs 13, 15 secured by the plastic film.
  • the second layer 14 overlaps the first layer 12 such that the seams 18 of the vacuum insulation panels 1) comprised in the second layer 14 are radially and longitudinally not at the same place as the seams 18 of the vacuum insulation panels 13 comprised in the first layer 12.
  • Fig 2D shows the detail A of Fig. 2C in a 2-fold magnification, wherein the second layer 14 overlaps the first layer 12 such that the seams 1) of the vacuum insulation panels 15 comprised in the second layer 14 are at least radially not at the same place as the seams 18 of the vacuum insulation panels 13 comprised in the first layer 12 .
  • the longitudinal position of the seams 18 in the first layer 12 and second layer 14 in relation to each other is not shown in Fig . 2D .
  • the material of the plastic film can be low-density polyethylene PE-LD, for instance , and its thickness 20 pm, for instance .
  • the width of the plastic film 16 can then be 60 to 120 mm, for instance .
  • the inner pipes 11 may be in the form of a spiral or a helical curve . This winding also in turn helps in that , when the insulated pipe 10 is bent , the inner pipes 11 do not endeavour to move in relation to each other .
  • the inner pipes 11 can be wound with a separate winding device . Conducted tests show, however, that the inner pipes 11 try to some extent to wind in relation to each other even without any separate winding arrangement . It has been found that this type of sel f-winding provides a suitable winding in most cases .
  • the insulating layer ( s ) 16 may be made of PE , PEX, PP, PUR or aerogel . They are most preferably made of cross-linked closed-cell polyethylene foam .
  • the insulating layer ( s ) 16 can be formed of one or several prefabricated insulating sheet layers . The thicknesses of the di f ferent layers can be the same . Naturally, the width of an outer layer must be greater than that of an inner layer .
  • the corrugated outer j acket 17 can be made of a polymer, preferably a polyolefin, in particular PE or PP . It is most preferably made of polyethylene PE .
  • the inner pipes 11, insulating layer (s) 16 and outer jacket 17 of the insulated pipe 10 are all made of either cross-linked or conventional polyethylene. For instance, the handling of the insulated pipe 10 during winding is then simple and easy. It is naturally also possible to use other materials.
  • the insulating layer (s) 16 can also be made of foamed polypropylene.
  • the outer jacket 17 can also be made of polypropylene.
  • the outer jacket 17 is preferably corrugated. This enhances the ring stiffness of the insulated pipe 10, for instance to 8 to 12 kN/m 2 .
  • the insulated pipe 10 is especially well suited for underground use. Possible applications are district heating networks and tap water systems, for instance. Due to the optional corrugation and material of the outer jacket, the material of the inner pipe(s) , the softness of the insulating layers 16, and the flexibility of the layers 12, 14 comprising VIPs 13, 15, the piping element may be bendable.
  • the fact that the insulated pipe 10 may be bendable means that the insulated pipe 10 can be coiled for storage and transport and uncoiled for installation.
  • the outer diameter of the insulated pipe 10 can typically be 100 to 300 mm. Piping elements 10 of this kind can be coiled for storage and transport into a coil with a diameter of 0.8 to 3 m, for instance.
  • the insulating layer is formed of a prefabricated insulating sheet.
  • the insulator can, however, also be made of a material that is prefabricated into a tube, in which case the tube has a longitudinal slot, through which the longitudinal components, such as inner pipes 11, are installed inside the insulating tube.
  • Second layer comprising VIPs is fed to the line
  • Second layer comprising VIPs is wound over the inner pipe

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Insulation (AREA)

Abstract

La présente invention concerne une conduite isolée comprenant une ou plusieurs conduites internes, une première couche comprenant des panneaux d'isolation sous vide joints les uns aux autres, une seconde couche comprenant des panneaux d'isolation sous vide joints les uns aux autres, une ou plusieurs couches d'isolation, et une chemise externe, la seconde couche étant agencée au-dessus de la première couche, et les première et seconde couches étant agencées de manière concentrique autour d'au moins l'une parmi les une ou plusieurs conduites internes, et chaque panneau d'isolation sous vide ayant au moins une couture permettant de joindre le panneau d'isolation sous vide à un panneau d'isolation sous vide voisin dans la même couche. La présente invention concerne en outre un procédé et un appareil pour la production de la conduite isolée.
EP24707497.4A 2023-02-28 2024-02-23 Conduite isolée Pending EP4673678A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102023104880 2023-02-28
PCT/EP2024/054675 WO2024179938A1 (fr) 2023-02-28 2024-02-23 Conduite isolée

Publications (1)

Publication Number Publication Date
EP4673678A1 true EP4673678A1 (fr) 2026-01-07

Family

ID=90057293

Family Applications (1)

Application Number Title Priority Date Filing Date
EP24707497.4A Pending EP4673678A1 (fr) 2023-02-28 2024-02-23 Conduite isolée

Country Status (3)

Country Link
EP (1) EP4673678A1 (fr)
CN (1) CN120693480A (fr)
WO (1) WO2024179938A1 (fr)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE501471C2 (sv) 1993-06-24 1995-02-20 Fjaerrvaermeutveckling Fvu Ab Isolerad rörledning
ITMI20011458A1 (it) * 2001-07-09 2003-01-09 Getters Spa Sistema per l'isolamento termico di corpi tubolari
DE102013008263B4 (de) 2013-05-15 2017-04-27 Va-Q-Tec Ag Verfahren zur Herstellung eines Vakuumisolationskörpers
DE102016103446A1 (de) 2016-02-26 2017-09-14 Uponor Innovation Ab Isoliertes Rohr
EP3354559B1 (fr) 2017-01-26 2019-04-03 AIRBUS HELICOPTERS DEUTSCHLAND GmbH Unité de production de poussée avec au moins deux ensembles rotor et un carénage
EP3354959B1 (fr) * 2017-01-31 2019-11-06 Powerpipe Systems AB Isolation de tuyau améliorée
PT3699470T (pt) * 2019-02-22 2023-01-10 Uponor Innovation Ab Tubo isolado

Also Published As

Publication number Publication date
CN120693480A (zh) 2025-09-23
WO2024179938A1 (fr) 2024-09-06

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