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WO2001014783A1 - Structure d'isolation thermique - Google Patents

Structure d'isolation thermique Download PDF

Info

Publication number
WO2001014783A1
WO2001014783A1 PCT/EP2000/007016 EP0007016W WO0114783A1 WO 2001014783 A1 WO2001014783 A1 WO 2001014783A1 EP 0007016 W EP0007016 W EP 0007016W WO 0114783 A1 WO0114783 A1 WO 0114783A1
Authority
WO
WIPO (PCT)
Prior art keywords
thermal insulation
insulation structure
structure according
spacers
annular spacers
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.)
Ceased
Application number
PCT/EP2000/007016
Other languages
German (de)
English (en)
Inventor
Holger Neumann
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.)
Karlsruher Institut fuer Technologie KIT
Original Assignee
Forschungszentrum Karlsruhe GmbH
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 Forschungszentrum Karlsruhe GmbH filed Critical Forschungszentrum Karlsruhe GmbH
Publication of WO2001014783A1 publication Critical patent/WO2001014783A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • F16L59/075—Arrangements using an air layer or vacuum the air layer or the vacuum being delimited by longitudinal channels distributed around the circumference of a tube

Definitions

  • the invention relates to a thermal insulation structure in the evacuated annular gap between two flexible corrugated pipes.
  • Such flexible corrugated pipes are used as transfer lines for refrigerants, e.g. liquid helium or liquid nitrogen are used.
  • refrigerants e.g. liquid helium or liquid nitrogen are used.
  • superconductor cables which contain helium, or high-temperature superconductors, e.g. cooled with nitrogen or neon and drawn into a flexible corrugated tube.
  • the corrugated pipe to be insulated is wrapped with super insulation, which is located in an evacuated annular gap between two corrugated pipes.
  • super insulation which is located in an evacuated annular gap between two corrugated pipes.
  • Motojima Superconduc-
  • the object of the invention is to provide a thermal insulation structure with high thermal resistance for flexible lines.
  • the invention achieves a separation of insulation and support system at such short intervals as is necessary for centering the corrugated pipe while maintaining the minimum bending radius, the heat conduction component being divided by dividing the cross supports between the inner and outer corrugated pipe by means of a helix and displacing the cross supports between the inner corrugated pipe and the spiral and the cross supports between the spiral and the outer corrugated pipe is kept small in the direction of the line.
  • FIG. 1 shows an isometric illustration of the insulation structure with the support system between the corrugated pipes with step sections
  • FIG. 2 shows a cross-sectional drawing of the insulation structure with the support system
  • FIG. 3 shows a longitudinal section of the insulation structure with the support system to clarify the supports between the corrugated pipes by the Support system and the figure 4 different cross-sectional shapes of the annular supports.
  • the invention essentially consists of the division of the cross supports between the inner and outer corrugated tube by means of a helix, so that annular spacers between the inner corrugated tube and helix are arranged offset to annular spacers between the helix and the outer corrugated tube, the super insulation both around the helix and can also be wrapped around the inner corrugated pipe and is only interrupted by the cross supports.
  • the spacing of the cross supports essentially depends on the minimum bending radius of the overall arrangement, the radially occurring load, the difference in the thickness of the super insulation layer and the thickness of the cross section of the annular supports and the rigidity of the helix 1.
  • the support system is shown isometrically in FIG. 1. From left to right, the individual concentric layers are shown as they follow each other. On the left you can see the inner corrugated tube 5. This is followed on the outside by a conventional spacer 4, which can consist of a knotted tape, which is wound helically around the inner corrugated tube, as shown in FIG. 1, or which can consist of several interwoven hollow tubes, which also wound helically around the inner corrugated tube. Next comes a helix 1, in which the helix paths in the line direction should not touch. The direction of rotation of this helix is opposite to the direction of rotation of the conventional spacer 4 (nub band) in order to enable easier evacuation.
  • knob-like spacers can also be attached to one side of the helix 1.
  • the first layer of superinsulation 3 is wound around this coil 1, which is interrupted in the direction of conduction by annular spacers 2, which are likewise arranged at constant intervals around the inner coil 1. Then follows a second coil 1, which by
  • ERSA ⁇ ZBL ⁇ T (RULE 26) the first annular spacer 2 is centered.
  • the distance between the inner and outer helix 1 and thus the cross-sectional thickness of the annular spacers 2 should be so large that contact of the inner layer of super insulation 3 with the outer helix 1 is avoided even if the minimum bending radius of the overall arrangement is observed.
  • the outer coil 1 is in turn wrapped with a multi-layer layer of superinsulation 3, which is interrupted in the direction of conduction by annular spacers 2, which are likewise arranged around the outer coil 1 at constant intervals. It is particularly important to ensure that the inner annular spacers 2 are arranged offset in the line direction from the outer annular spacers.
  • This arrangement surrounds the outer corrugated tube 6, which is usually still surrounded by a PE protective jacket.
  • the distance between the outer coil 1 and the outer corrugated tube 6 and thus the cross-sectional thickness of the annular spacers 2 should be so large that contact of the outer layer of super insulation 3 with the outer coil 1 is avoided even if the minimum bending radius of the overall arrangement is observed.
  • Figure 2 shows a cross section (perpendicular to the axis of symmetry) through a support system, as shown in Figure 1.
  • the annular spacers are not shown here.
  • Figure 3 shows a longitudinal section through the insulation structure, as shown in Figure 1.
  • the axis of symmetry is shown as a dash-dot line.
  • the insulating layers are kept at a concentric distance by means of the annular spacers 2 and the nubbed band 4.
  • Figure 4 shows various cross-sectional shapes for annular spacers.
  • 4a is an annular spacer 2 made of a thin-walled hose, which for stabilization with I-
  • REPLACEMENT B ⁇ (RULE 26) solations material is filled, or from a hose with a wall thickness that ensures a sufficient support function, which hose can also be perforated to ensure a low flow resistance during evacuation.
  • the spacer consists of three packed tubes, which in turn are thin-walled and filled with insulation material or have a sufficient wall thickness to take over the support function and can also be perforated.
  • Fig. 4c shows a ring with a double T profile, which can also be perforated to ensure a low flow resistance during evacuation.

Landscapes

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

Abstract

L'invention concerne une structure d'isolation thermique dans l'interstice annulaire sous vide séparant des tubes ondulés. L'invention a pour objet de proposer un système d'appui de grande résistance thermique pour des conduites flexibles. A cet effet, les supports transversaux sont répartis entre un tube ondulé interne (5) et un tube ondulé externe (6) à l'aide d'une spirale, de telle façon que les entretoises annulaires (2) placées entre le tube ondulé interne (5) et la spirale (1) sont décalés par rapport aux entretoises annulaires placées entre la spirale et le tube ondulé externe (6). La superisolation (3) est enroulée autour de la spirale comme autour du tube ondulé interne (6) et ne peut être interrompue que par les supports transversaux.
PCT/EP2000/007016 1999-08-19 2000-07-21 Structure d'isolation thermique Ceased WO2001014783A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1999139405 DE19939405C1 (de) 1999-08-19 1999-08-19 Thermischer Isolationsaufbau
DE19939405.9 1999-08-19

Publications (1)

Publication Number Publication Date
WO2001014783A1 true WO2001014783A1 (fr) 2001-03-01

Family

ID=7918944

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2000/007016 Ceased WO2001014783A1 (fr) 1999-08-19 2000-07-21 Structure d'isolation thermique

Country Status (2)

Country Link
DE (1) DE19939405C1 (fr)
WO (1) WO2001014783A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10060554A1 (de) * 2000-12-06 2002-06-20 Kraftanlagen Nukleartechnik Gm Thermalschild für Flüssig-Helium-Versorgungssysteme, insbesondere für Teilchenbeschleunigeranlagen

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3473575A (en) * 1966-06-01 1969-10-21 Kabel Metallwerke Ghh Thermally insulated pipe
US3565118A (en) * 1968-07-24 1971-02-23 Thornton Stearns Thermal insulation for fluid storage containers
DE3338465A1 (de) * 1983-10-22 1985-05-02 kabelmetal electro GmbH, 3000 Hannover Waermeisoliertes leitungsrohr
US4570679A (en) * 1983-09-26 1986-02-18 Kabelmetal Electro Gmbh Conduction of low temperature fluid
US4570678A (en) * 1983-04-25 1986-02-18 Kabelmetal Electro Gmbh Conduit system for transporting low temperature fluids

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3473575A (en) * 1966-06-01 1969-10-21 Kabel Metallwerke Ghh Thermally insulated pipe
US3565118A (en) * 1968-07-24 1971-02-23 Thornton Stearns Thermal insulation for fluid storage containers
US4570678A (en) * 1983-04-25 1986-02-18 Kabelmetal Electro Gmbh Conduit system for transporting low temperature fluids
US4570679A (en) * 1983-09-26 1986-02-18 Kabelmetal Electro Gmbh Conduction of low temperature fluid
DE3338465A1 (de) * 1983-10-22 1985-05-02 kabelmetal electro GmbH, 3000 Hannover Waermeisoliertes leitungsrohr

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
H LAEGER ET AL: "Long flexible transfer lines for gaseous and liquid helium", CRYOGENICS,GB,IPC SCIENCE AND TECHNOLOGY PRESS LTD. GUILDFORD, vol. 18, no. 12, December 1978 (1978-12-01), pages 659 - 662, XP002124084, ISSN: 0011-2275 *

Also Published As

Publication number Publication date
DE19939405C1 (de) 2000-07-06

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