EP0212473B1 - Heat pipe controlled by pressure - Google Patents

Heat pipe controlled by pressure Download PDF

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Publication number
EP0212473B1
EP0212473B1 EP86110933A EP86110933A EP0212473B1 EP 0212473 B1 EP0212473 B1 EP 0212473B1 EP 86110933 A EP86110933 A EP 86110933A EP 86110933 A EP86110933 A EP 86110933A EP 0212473 B1 EP0212473 B1 EP 0212473B1
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EP
European Patent Office
Prior art keywords
heat pipe
heat
displacement body
cooling zone
pressure
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Expired
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EP86110933A
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German (de)
French (fr)
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EP0212473A3 (en
EP0212473A2 (en
Inventor
Carlo Bassani
Claus A.O. Busse
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European Atomic Energy Community Euratom
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European Atomic Energy Community Euratom
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Publication of EP0212473A2 publication Critical patent/EP0212473A2/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
    • F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
    • F28D15/06—Control arrangements therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S165/00—Heat exchange
    • Y10S165/132—Heat exchange with adjustor for heat flow
    • Y10S165/133—Conduction rate

Definitions

  • the invention relates to a pressure-controlled heat pipe, consisting of a closed vessel containing a heat transfer medium with a heat source at which the heat transfer medium evaporates, and a vertically arranged heat sink in the form of a cooling zone, a non-condensable inert gas at a controllable pressure in at the upper end of the cooling zone the vessel can be fed.
  • Pressure controlled heat pipes are e.g. known from the journal "Heat and mass transfer", Volume 19, 1985, pages 67 to 71.
  • the temperature of such heat pipes is influenced by the size of an inert gas plug in the cooling zone. If you want to raise the temperature of the heating furnace, you increase the inert gas pressure, which reduces the cooled area of the cooling zone that can be reached by the heat transfer medium.
  • the object of the invention is to improve a heat pipe of the type mentioned in such a way that solid deposits can no longer occur in the cooling zone, even if the inert gas pressure is changed quickly for control purposes.
  • This object is achieved in that from the upper end of the cooling zone along the central region of this zone, a good heat-conducting displacement body protrudes downwards and that this displacement body carries at least in its upper part baffles which separate the space between the cooled wall and the displacement body Divide a variety of interconnected volumes.
  • the baffles are preferably designed as spiral ribs.
  • spiral ribs serve on the one hand to extend the path, the condensate droplets have to take on their way up, so that they no longer come to the coldest area of the cooling wall, and on the other hand to the convection flow of the inert gas in the axial area of the To hinder the cooling zone.
  • the displacement body contributes to achieving the object on which the invention is based by firstly occupying the axial region of the cooling zone and thus deflecting condensate droplets early towards the cooled wall, and secondly by opening the axial region of the cooling zone above the steam zone maintains a high temperature at which solid deposits are not possible.
  • Heat pipes with displacement bodies in the condensation zone are known per se, e.g. from "Proceedings Part II, 5th International Heat Pipe Conference, Tsukuba Science City, May 14-18, 1984, page 47.
  • the spiral ribs are preferably inclined outward in a roof shape, so that condensate can flow outward by gravity in the direction of the chimney wall.
  • spiral ribs are designed as a single-start screw. It would also be possible, for example, to interrupt the rib structure and to form at least two single-start screws lying one behind the other, one of which could be, for example, right-handed and the other left-handed, or one of which has a larger screw thread than the other.
  • the heat pipe furnace shown in Fig. 1 consists of a double-walled horizontal heat pipe 1 which coaxially surrounds a furnace channel 2.
  • a heat transfer medium e.g. Water, cesium or sodium
  • the heat source 3 is formed, for example, by a resistance heater which is inserted into an insulation 5 surrounding the heat pipe 1 and which heats the heat pipe 1 from the outside.
  • the heat sink 4 is formed by a chimney which is connected to the heat pipe 1 and protrudes vertically upwards from the insulation 5.
  • the outer wall of the chimney is cooled in the upper area, for example with the aid of water cooling 6.
  • a helium line through which the uppermost chimney area can be provided with an inert gas plug 8.
  • the boundary layer 9 between the vaporous heat transfer medium in the heat pipe 1 and the inert gas plug 8 can be displaced vertically, so that a more or less large area of the cooled wall is available as a heat sink 4 for the heat transfer medium.
  • the helium is fed in by a control circuit, not shown, which orients the temperature in the furnace 2 at a target temperature.
  • Fig. 2 shows an enlarged view of the upper end of the chimney with the water cooling 6 and the boundary layer 9 between the inert gas plug 8 and the steam of the heat transfer medium.
  • a displacement body 11 which consists of a highly thermally conductive metal, projects axially into this chimney from above through the cover 7.
  • the displacement body 11 extends below the minimum level of the boundary layer 9, so that its tip is always immersed in the vaporous heat transfer medium.
  • the upper half of this displacer 11 carries spiral ribs 12 which extend almost to the wall of the chimney provided with capillary grooves 13.
  • the displacement body 11 according to the invention deflects the droplets laterally and reduces convection effects, since the steam particles are forced outward from the axial area towards the cooled chimney wall at an early stage.
  • the displacer 11 the lower end of which is immersed in the hot steam of the heat transfer medium, keeps the spiral ribs 12 at a high temperature with respect to the wall, so that there is no fear of solid deposits which could render the furnace 2 unusable.
  • the displacement body 11 also brings safety advantages in the event of an accident in which the helium feed line 14 breaks. In this case, the then rising steam flow of the heat transfer medium must pass through the entire spirals 12 before it can exit through the broken helium line 14.
  • the displacement body 11 thus acts as a condensation trap and prevents the heat transfer medium from escaping.
  • the heat pipe can also have a shape other than that of a double-walled coaxial pipe.
  • the heat pipe does not need to be horizontal, but can also be inclined or vertical. While it is important in a horizontal heat pipe assembly that all inner walls are provided with capillary structures so that all walls are always wetted with liquid heat transfer medium, with vertical assembly the wetting could also be done by gravity alone without capillary structures.
  • the chimney could also be placed at an angle on the heat pipe if only it was ensured that it was higher than the latter.
  • spiral ribs 12 could be replaced by internally shaped internals, e.g. through pagoda-like deflector plates, which act as chicanes for the steam flow and also divide the annular space between the displacement body and the cooled wall into numerous interconnected partial volumes.
  • internally shaped internals e.g. through pagoda-like deflector plates, which act as chicanes for the steam flow and also divide the annular space between the displacement body and the cooled wall into numerous interconnected partial volumes.
  • the spiral screw can also be designed as a multi-start screw, which can have a greater pitch than a single-start screw, without the individual partial volumes being increased thereby.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Pipeline Systems (AREA)

Description

Die Erfindung bezieht sich auf ein druckgesteuertes Wärmerohr, bestehend aus einem ein Wärmeträgermedium enthaltenden geschlossenen Gefäß mit einer Wärmequelle, an der das Wärmeträgermedium verdampft, und einer senkrecht angeordneten Wärmesenke in Form einer Kühlzone, wobei am oberen Ende der Kühlzone ein nichtkondensierbares Inertgas unter regelbarem Druck in das Gefäß einspeisbar ist.The invention relates to a pressure-controlled heat pipe, consisting of a closed vessel containing a heat transfer medium with a heat source at which the heat transfer medium evaporates, and a vertically arranged heat sink in the form of a cooling zone, a non-condensable inert gas at a controllable pressure in at the upper end of the cooling zone the vessel can be fed.

Druckgesteuerte Wärmerohre sind z.B. aus der Zeitschrift "Wärme- und Stoffübertragung", Band 19, 1985, Seiten 67 bis 71 bekannt. Die Temperatur solcher Wärmerohre wird durch die Größe eines Inertgasstopfens in der Kühlzone beeinflußt. Will man die Temperatur des Wärmeofens anheben, dann steigert man den Inertgasdruck, wodurch die vom Wärmeträgermedium erreichbare gekühlte Fläche der Kühlzone verringert wird.Pressure controlled heat pipes are e.g. known from the journal "Heat and mass transfer", Volume 19, 1985, pages 67 to 71. The temperature of such heat pipes is influenced by the size of an inert gas plug in the cooling zone. If you want to raise the temperature of the heating furnace, you increase the inert gas pressure, which reduces the cooled area of the cooling zone that can be reached by the heat transfer medium.

Besonders bei niedrigen Betriebsdrücken hat sich gezeigt, daß sich an der Grenzfläche zwischen dem dampfförmigen Wärmeträgermedium und dem Inertgas in der Kühlzone eine Nebelzone ausbildet und daß Dampftröpfchen weit in den Bereich des Inertgasstopfens nach oben gerissen werden. Es kann dann passieren, daß der Dampf an der wesentlich kühleren Wand im Bereich des Inertgasstopfens nicht nur kondensiert, sondern sogar als fester Stoff abgelagert wird. Dieser Effekt wird noch verstärkt durch die natürliche Konvektion des Edelgases, das im Axialbereich der Kühlzone aufsteigt und im kühleren Wandbereich wieder nach unten fällt.Particularly at low operating pressures, it has been shown that a mist zone forms at the interface between the vaporous heat transfer medium and the inert gas in the cooling zone and that steam droplets are torn far up into the area of the inert gas plug. It can then happen that the steam not only condenses on the much cooler wall in the area of the inert gas pot, but is even deposited as a solid substance. This effect is intensified by the natural convection of the noble gas, which rises in the axial area of the cooling zone and falls down again in the cooler wall area.

Besonders groß ist diese Gefahr während eines Regelübergangs des Wärmerohrs auf niedrigere Temperatur, da dann ein Teil des Inertgases abgezogen wird.This risk is particularly great during a control transition of the heat pipe to a lower temperature, since part of the inert gas is then drawn off.

Aufgabe der Erfindung ist es, ein Wärmerohr der eingangs genannten Art so zu verbessern, daß Feststoffablagerungen in der Kühlzone nicht mehr auftreten können, und zwar selbst dann nicht, wenn der Inertgasdruck zu Regelzwecken rasch geändert wird.The object of the invention is to improve a heat pipe of the type mentioned in such a way that solid deposits can no longer occur in the cooling zone, even if the inert gas pressure is changed quickly for control purposes.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß vom oberen Ende der Kühlzone entlang des zentralen Bereichs dieser Zone ein gut wärmeleitender Verdrängungskörper nach unten ragt und daß dieser Verdrängungskörper zumindest in seinem oberen Teil Ablenkbleche trägt, die den Zwischenraum zwischen der gekühlten Wand und dem Verdrängungskörper in eine Vielzahl von miteinander in Verbindung stehenden Volumen unterteilen. Vorzugsweise sind die Ablenkbleche als Spiralrippen ausgebildet.This object is achieved in that from the upper end of the cooling zone along the central region of this zone, a good heat-conducting displacement body protrudes downwards and that this displacement body carries at least in its upper part baffles which separate the space between the cooled wall and the displacement body Divide a variety of interconnected volumes. The baffles are preferably designed as spiral ribs.

Die Spiralrippen dienen zum einen dazu, den Weg zu verlängern, den Kondensattröpfchen auf ihrem Weg nach oben nehmen müssen, so daß sie gar nicht mehr bis in den kältesten Bereich der Kühlwand kommen, und zum anderen dazu, die Konvektionsströmung des Inertgases im axialen Bereich der Kühlzone zu behindern.The spiral ribs serve on the one hand to extend the path, the condensate droplets have to take on their way up, so that they no longer come to the coldest area of the cooling wall, and on the other hand to the convection flow of the inert gas in the axial area of the To hinder the cooling zone.

Der Verdrängungskörper trägt zur Lösung der der Erfindung zugrundeliegenden Aufgabe dadurch bei, daß er zum einen den Axialbereich der Kühlzone besetzt und damit Kondensattröpfchen frühzeitig in Richtung auf die gekühlte Wand ablenkt, und zum anderen dadurch, daß er den axialen Bereich der Kühlzone oberhalb der Dampfzone auf einer hohen Temperatur hält, bei der Feststoffablagerungen nicht möglich sind.The displacement body contributes to achieving the object on which the invention is based by firstly occupying the axial region of the cooling zone and thus deflecting condensate droplets early towards the cooled wall, and secondly by opening the axial region of the cooling zone above the steam zone maintains a high temperature at which solid deposits are not possible.

Wärmerohre mit Verdrängungskörpern in der Kondensationszone sind an sich bekannt, z.B. aus "Proceedings Part II, 5th International Heat Pipe Conference, Tsukuba Science City, 14.-18. Mai 1984, Seite 47.Heat pipes with displacement bodies in the condensation zone are known per se, e.g. from "Proceedings Part II, 5th International Heat Pipe Conference, Tsukuba Science City, May 14-18, 1984, page 47.

Vorzugsweise sind die Spiralrippen dachförmig nach außen geneigt, so daß Kondensat durch Schwerkraft nach außen in Richtung auf die Kaminwand abfließen kann.The spiral ribs are preferably inclined outward in a roof shape, so that condensate can flow outward by gravity in the direction of the chimney wall.

Es ist nicht notwendig, aber aus fertigungstechnischen Gründen sinnvoll, daß die Spiralrippen als eingängige Schraube ausgebildet sind. Möglich wäre es beispielsweise auch, die Rippenstruktur zu unterbrechen und mindestens zwei hintereinanderliegende eingängige Schrauben auszubilden, von denen die eine beispielsweise rechtsgängig und die andere linksgängig sein könnte oder von denen die eine einen größeren Schraubengang als die andere besitzt.It is not necessary, but useful for manufacturing reasons, that the spiral ribs are designed as a single-start screw. It would also be possible, for example, to interrupt the rib structure and to form at least two single-start screws lying one behind the other, one of which could be, for example, right-handed and the other left-handed, or one of which has a larger screw thread than the other.

Nachfolgend wird die Erfindung anhand eines bevorzugten Ausführungsbeispiels mithilfe zweier Figuren näher erläutert.

  • Fig. 1 zeigt im Querschnitt einen Wärmerohrofen mit einem erfindungsgemäßen druckgesteuerten Wärmerohr.
  • Fig. 2 zeigt in vergrößertem Maßstab ein Detail aus Fig. 1.
The invention is explained in more detail below on the basis of a preferred exemplary embodiment with the aid of two figures.
  • Fig. 1 shows in cross section a heat pipe furnace with a pressure-controlled heat pipe according to the invention.
  • FIG. 2 shows a detail from FIG. 1 on an enlarged scale.

Der in Fig. 1 dargestellte Wärmerohrofen besteht aus einem doppelwandigen horizontalen Wärmerohr 1, das einen Ofenkanal 2 koaxial umgibt. Im Bereich zwischen den beiden Wänden des Wärmerohrs 1 befindet sich ein Wärmeträgermedium, z.B. Wasser, Caesium oder Natrium, das an einer Wärmequelle 3 verdampft und an einer Wärmesenke 4 kondensiert. Die Wärmequelle 3 wird beispielsweise von einer Widerstandsheizung gebildet, die in eine das Wärmerohr 1 umgebende Isolierung 5 eingefügt ist und das Wärmerohr 1 von außen aufheizt. Die Wärmesenke 4 wird von einem Kamin gebildet, der an das Wärmerohr 1 angeschlossen ist und senkrecht nach oben aus der Isolierung 5 herausragt. Die Au- ßenwand des Kamins ist im oberen Bereich gekühlt, beispielsweise mithilfe einer Wasserkühlung 6. An einem Deckel 7 des Kamins mündet eine Inertgasleitung 14, z.B. eine Heliumleitung, durch die der oberste Kaminbereich mit einem Inertgasstopfen 8 versehen werden kann. Durch geeignete Wahl des Heliumdrucks kann die Grenzschicht 9 zwischen dem dampfförmigen Wärmeträgermedium in dem Wärmerohr 1 und dem Inertgasstopfen 8 vertikal verschoben werden, so daß ein mehr oder minder großer Bereich der gekühlten Wand als Wärmesenke 4 für das Wärmeträgermedium verfügbar ist. Die Heliumeinspeisung erfolgt durch einen nicht dargestellten Regelkreis, der die Temperatur im Ofen 2 an einer Solltemperatur orientiert.The heat pipe furnace shown in Fig. 1 consists of a double-walled horizontal heat pipe 1 which coaxially surrounds a furnace channel 2. In the area between the two walls of the heat pipe 1 there is a heat transfer medium, e.g. Water, cesium or sodium, which evaporates at a heat source 3 and condenses at a heat sink 4. The heat source 3 is formed, for example, by a resistance heater which is inserted into an insulation 5 surrounding the heat pipe 1 and which heats the heat pipe 1 from the outside. The heat sink 4 is formed by a chimney which is connected to the heat pipe 1 and protrudes vertically upwards from the insulation 5. The outer wall of the chimney is cooled in the upper area, for example with the aid of water cooling 6. An inert gas line 14, e.g. a helium line through which the uppermost chimney area can be provided with an inert gas plug 8. By suitable choice of the helium pressure, the boundary layer 9 between the vaporous heat transfer medium in the heat pipe 1 and the inert gas plug 8 can be displaced vertically, so that a more or less large area of the cooled wall is available as a heat sink 4 for the heat transfer medium. The helium is fed in by a control circuit, not shown, which orients the temperature in the furnace 2 at a target temperature.

Fig. 2 zeigt vergrößert das obere Ende des Kamins mit der Wasserkühlung 6 und der Grenzschicht 9 zwischen dem Inertgasstopfen 8 und dem Dampf des Wärmeträgermediums. In diesen Kamin ragt axial von oben durch den Deckel 7 gehalten ein Verdrängungskörper 11 hinein, der aus einem gut wärmeleitfähigen Metall besteht. Der Verdrängungskörper 11 reicht bis unterhalb des Mindestniveaus der Grenzschicht 9, so daß seine Spitze stets in das dampfförmige Wärmeträgermedium eintaucht. Die obere Hälfte dieses Verdrängungskörpers 11 trägt Spiralrippen 12, die fast bis an die mit Kapillarrillen 13 versehene Wand des Kamins reichen.Fig. 2 shows an enlarged view of the upper end of the chimney with the water cooling 6 and the boundary layer 9 between the inert gas plug 8 and the steam of the heat transfer medium. A displacement body 11, which consists of a highly thermally conductive metal, projects axially into this chimney from above through the cover 7. The displacement body 11 extends below the minimum level of the boundary layer 9, so that its tip is always immersed in the vaporous heat transfer medium. The upper half of this displacer 11 carries spiral ribs 12 which extend almost to the wall of the chimney provided with capillary grooves 13.

Der erfindungsgemäße Verdrängungskörper 11 lenkt die Tröpfchen seitlich ab und verringert Konvektionseffekte, da die Dampfpartikel frühzeitig aus dem axialen Bereich nach außen in Richtung auf die gekühlte Kaminwand gedrängt werden. Zugleich hält der Verdrängungskörper 11, dessen unteres Ende in den heißen Dampf des Wärmeträgermediums eintaucht, die Spiralrippen 12 auf einer gegenüber der Wand hohen Temperatur, so daß dort keine Feststoffablagerungen zu befürchten sind, die den Ofen 2 unbrauchbar machen könnten. Diese Einflüsse des erfindungsgemäßen Verdrängungskörpers 11 fördern also die Stabilität unter Normalbedingungen.The displacement body 11 according to the invention deflects the droplets laterally and reduces convection effects, since the steam particles are forced outward from the axial area towards the cooled chimney wall at an early stage. At the same time, the displacer 11, the lower end of which is immersed in the hot steam of the heat transfer medium, keeps the spiral ribs 12 at a high temperature with respect to the wall, so that there is no fear of solid deposits which could render the furnace 2 unusable. These influences of the displacement body 11 according to the invention thus promote stability under normal conditions.

Bei gewünschten Änderungen des Betriebszustands, insbesondere bei einer Absenkung der Ofentemperatur durch Verkleinerung des Inertgasstopfens 8 wird ebenfalls die Gefahr von bis in die oberen Bereiche des Kamins vordringenden Kondensattröpfchen beseitigt, während ohne den erfindungsgemäßen Verdrängungskörper 11 in diesem Fall sogar in die Heliumleitung 14 Kondensattröpfchen eindringen können.If changes in the operating state are desired, in particular when the furnace temperature is reduced by reducing the size of the inert gas plug 8, the risk of condensate droplets penetrating into the upper regions of the chimney is also eliminated, while in this case condensate droplets can even penetrate into the helium line 14 without the displacement body 11 according to the invention .

Schließlich bringt der erfindungsgemäße Verdrängungskörper 11 auch Sicherheitsvorteile bei einem Unfall, bei dem die Heliumzuleitung 14 bricht. In diesem Fall muß der dann aufsteigende Dampfstrom des Wärmeträgermediums die ganzen Spiralen 12 durchlaufen, ehe er durch die gebrochene Heliumleitung 14 austreten kann. Hier wirkt der Verdrängungskörper 11 somit als Kondensationsfalle und verhindert ein Austreten des Wärmeträgermediums.Finally, the displacement body 11 according to the invention also brings safety advantages in the event of an accident in which the helium feed line 14 breaks. In this case, the then rising steam flow of the heat transfer medium must pass through the entire spirals 12 before it can exit through the broken helium line 14. Here, the displacement body 11 thus acts as a condensation trap and prevents the heat transfer medium from escaping.

Das Wärmerohr kann auch eine andere Form als die eines doppelwandigen koaxialen Rohrs besitzen. Das Wärmerohr braucht nicht waagerecht zu liegen, sondern kann auch geneigt sein oder senkrecht stehen. Während bei einer waagerechten Wärmerohrmontage wichtig ist, daß alle Innenwände mit Kapillarstrukturen versehen sind, damit alle Wände stets mit flüssigem Wärmeträgermedium benetzt sind, könnte bei einer Senkrechtmontage die Benetzung auch ohne Kapillarstrukturen alleine durch die Schwerkraft erfolgen. Der Kamin könnte auch schräg auf dem Wärmerohr aufgesetzt werden, wenn nur dafür gesorgt wird, daß er höher als letzteres liegt.The heat pipe can also have a shape other than that of a double-walled coaxial pipe. The heat pipe does not need to be horizontal, but can also be inclined or vertical. While it is important in a horizontal heat pipe assembly that all inner walls are provided with capillary structures so that all walls are always wetted with liquid heat transfer medium, with vertical assembly the wetting could also be done by gravity alone without capillary structures. The chimney could also be placed at an angle on the heat pipe if only it was ensured that it was higher than the latter.

Die Spiralrippen 12 könnten durch anders geformte Einbauten ersetzt werden, z.B. durch pagoden- ähnliche Abweisbleche, die als Schikanen für die Dampfströmung wirken und ebenfalls den Ringraum zwischen dem Verdrängungskörper und der gekühlten Wand in zahlreiche miteinander in Verbindung stehende Teilvolumen unterteilen.The spiral ribs 12 could be replaced by internally shaped internals, e.g. through pagoda-like deflector plates, which act as chicanes for the steam flow and also divide the annular space between the displacement body and the cooled wall into numerous interconnected partial volumes.

Je nach den zulässigen Druckverlusten entlang der Kühlzone kann man die Spiralschraube auch als mehrgängige Schraube ausbilden, die eine größere Steigung als eine eingängige Schraube haben kann, ohne daß die einzelnen Teilvolumen dadurch vergrößert würden.Depending on the permissible pressure losses along the cooling zone, the spiral screw can also be designed as a multi-start screw, which can have a greater pitch than a single-start screw, without the individual partial volumes being increased thereby.

Claims (3)

1. A pressure-controlled heat pipe consisting of a closed recipient containing a heat carrying medium with a heat source where the heat carrying medium vaporizes, and a vertically disposed heat drain in the form of a cooling zone, a non-condensable inert gas being susceptible to be fed under controllable pressure into the recipient at the upper end of the cooling zone, characterized in that a thermally conductive displacement body (11) extends downwards from the upper end of the cooling zone along the central area of said zone, and that this displacement body (11) carries at least in its upper part deflection sheets (12), which divide the interspace between the displacement body (11) and the cooled wall of this zone into a plurality of interconnected volumes.
2. A heat pipe according to claim 1, characterized in that the deflection sheets have the form of helical ribs (12), which extend into the vicinity of the cooled wall.
3. A heat pipe according to claim 2, characterized in that the helical ribs (12) have a roof-shaped inclination to the outside.
EP86110933A 1985-08-19 1986-08-07 Heat pipe controlled by pressure Expired EP0212473B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU86046 1985-08-19
LU86046A LU86046A1 (en) 1985-08-19 1985-08-19 PRESSURE CONTROLLED HEAT PIPE

Publications (3)

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EP0212473A2 EP0212473A2 (en) 1987-03-04
EP0212473A3 EP0212473A3 (en) 1987-07-29
EP0212473B1 true EP0212473B1 (en) 1989-05-24

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EP86110933A Expired EP0212473B1 (en) 1985-08-19 1986-08-07 Heat pipe controlled by pressure

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US (1) US4674562A (en)
EP (1) EP0212473B1 (en)
JP (1) JPH0686991B2 (en)
CA (1) CA1267406A (en)
DE (1) DE3663587D1 (en)
DK (1) DK160963C (en)
IE (1) IE57284B1 (en)
LU (1) LU86046A1 (en)
PT (1) PT83193B (en)

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DE102008021975A1 (en) 2008-05-02 2009-11-05 Bayerische Motoren Werke Aktiengesellschaft Pressure controlled heat pipe for use as e.g. thermostat, has encapsulated area formed within wall, where flexible part of wall is folded into interior space of pipe, so that pressure change is produced in interior space of pipe

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FR2642156B1 (en) * 1989-01-20 1994-05-20 Bertin Et Cie METHOD AND DEVICE FOR QUICK REGULATION OF A WALL TEMPERATURE
US4917178A (en) * 1989-05-18 1990-04-17 Grumman Aerospace Corporation Heat pipe for reclaiming vaporized metal
GB2315324A (en) * 1996-07-16 1998-01-28 Alan Brown Thermo-syphons
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DE102008021975A1 (en) 2008-05-02 2009-11-05 Bayerische Motoren Werke Aktiengesellschaft Pressure controlled heat pipe for use as e.g. thermostat, has encapsulated area formed within wall, where flexible part of wall is folded into interior space of pipe, so that pressure change is produced in interior space of pipe

Also Published As

Publication number Publication date
IE57284B1 (en) 1992-07-01
US4674562A (en) 1987-06-23
DE3663587D1 (en) 1989-06-29
EP0212473A3 (en) 1987-07-29
DK385886D0 (en) 1986-08-13
CA1267406A (en) 1990-04-03
PT83193A (en) 1986-09-01
DK160963C (en) 1991-11-04
JPH0686991B2 (en) 1994-11-02
DK385886A (en) 1987-02-20
LU86046A1 (en) 1986-09-11
PT83193B (en) 1992-10-30
DK160963B (en) 1991-05-06
IE862076L (en) 1987-02-19
JPS6298191A (en) 1987-05-07
EP0212473A2 (en) 1987-03-04

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