WO2010072221A2 - Cooling device with bended flat tube and related manufacturing method - Google Patents

Cooling device with bended flat tube and related manufacturing method Download PDF

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Publication number
WO2010072221A2
WO2010072221A2 PCT/DK2009/000263 DK2009000263W WO2010072221A2 WO 2010072221 A2 WO2010072221 A2 WO 2010072221A2 DK 2009000263 W DK2009000263 W DK 2009000263W WO 2010072221 A2 WO2010072221 A2 WO 2010072221A2
Authority
WO
WIPO (PCT)
Prior art keywords
cooling device
flat tube
axis
heat receiving
bending
Prior art date
Application number
PCT/DK2009/000263
Other languages
French (fr)
Other versions
WO2010072221A3 (en
Inventor
Henrik Olsen
Original Assignee
Noise Limit Aps
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 Noise Limit Aps filed Critical Noise Limit Aps
Publication of WO2010072221A2 publication Critical patent/WO2010072221A2/en
Publication of WO2010072221A3 publication Critical patent/WO2010072221A3/en

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Classifications

    • 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
    • F28D15/0266—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 with separate evaporating and condensing chambers connected by at least one conduit; Loop-type heat pipes; with multiple or common evaporating or condensing chambers
    • 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
    • F28D15/0233—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 the conduits having a particular shape, e.g. non-circular cross-section, annular
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L23/00—Details of semiconductor or other solid state devices
    • H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
    • H01L23/46—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements involving the transfer of heat by flowing fluids
    • H01L23/473—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements involving the transfer of heat by flowing fluids by flowing liquids
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/0001—Technical content checked by a classifier
    • H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00

Definitions

  • the present invention relates to a cooling device for cooling electronic components, in particular a cooling device with a bended flat tube, and a method for manufacturing a cooling device.
  • Cooling devices for electronic devices are often limited in space due to e.g. cabinets and other units in the electronic device, and has to comply with strict rules of dimensions. Further, the directions of cooling air flow are limited due to the construction of the devices.
  • a cooling device comprising a flat tube having a first side surface and a second side surface and extending from a first end to a second end. Further, the cooling device comprises a first heat receiving part, wherein the flat tube comprises a first part extending along a first axis and a second part extending along a second axis. The flat tube further comprises a first bending between the first part and the second part such that the first side surface of the first part faces the first side surface of the second part, and the first angle between the first axis and the second axis is in the range from about 20° to about 160°.
  • a method for manufacturing a cooling device comprising a flat tube having a first side surface and a second side surface and extending from a first end to a second end, wherein the method comprises bending the flat tube such that the first side surface of a first part of the flat tube faces the first side surface of a second part of the flat tube and the angle between the first part and the second part is in the range from about 20° to about 160°.
  • the cooling device is in particular advantageous for applications where a thin cooling device is desirable, e.g. for flat screens, e.g. plasma screen or LCD screens, computers, e.g. all-in-one (AIO) computers, or servers, game consoles, and the like.
  • flat screens e.g. plasma screen or LCD screens
  • computers e.g. all-in-one (AIO) computers, or servers, game consoles, and the like.
  • AIO all-in-one
  • Fig. 1 schematically illustrates an embodiment of a cooling device of the invention
  • Fig. 2 schematically illustrates an embodiment of a cooling device of the invention
  • Fig. 3 schematically illustrates an exemplary bending of a cooling device
  • Fig. 4 schematically illustrates an exemplary bending of a cooling device
  • Fig. 5 schematically illustrates an exemplary bending of a cooling device
  • Fig. 6 illustrates a cross section of a flat tube
  • Fig. 7 is a perspective view of a part of a cooling device
  • Fig. 8 is a perspective view of a part of a cooling device
  • Fig. 9 is a perspective view of a cooling device according to the present invention
  • Fig. 10 schematically illustrates an embodiment of a cooling device of the invention
  • Fig. 10 schematically illustrates an embodiment of a cooling device of the invention
  • FIG. 11 is a partial side view of the cooling device of Fig. 10, Fig. 12 schematically illustrates an embodiment of a cooling device of the invention, Fig. 13 schematically illustrates an embodiment of a cooling device of the invention, Fig. 14 schematically illustrates an embodiment of a cooling device of the invention, Fig. 15 schematically illustrates an embodiment of a cooling device of the invention, Fig. 16 schematically illustrates an embodiment of a cooling device of the invention,
  • Fig. 17 schematically illustrates an embodiment of a cooling device in a first operating position
  • Fig. 18 illustrates the cooling device of Fig. 17 in a second operating position
  • Fig. 19 illustrates a part of a cooling device
  • Fig. 20 illustrates an embodiment of the cooling device
  • Fig. 21 illustrates a cooling device used for test
  • Fig. 22 is a side view of the cooling device of Fig. 22
  • Fig. 23 illustrates an example of the cooling device
  • Fig. 24 illustrates an example of the cooling device.
  • the cooling device according to the present invention provides a cooling device with a low consumption of material.
  • the cooling device of the present invention provides a high degree of design flexibility and has few components and thus few connecting points leading to simplified and more rapid manufacturing, which lower the costs of the cooling device.
  • the cooling device enables reduction of the number of part to be joined thereby reducing the number of connections in the cooling device, which is an advantage in production.
  • one or more parts of the flat tube is/are straight and extend in a plane.
  • the flat tube has a first side surface and a second side surface.
  • the first part of the flat tube may extend in a first plane, i.e. the first side surface of the first part may extend in a first plane.
  • the second part of the flat tube may extend along a cylindrical surface, i.e. the first side surface of the second part may be a cylindrical surface.
  • a cylindrical surface may facilitate improved utilization of available envelope volume for the cooling device.
  • the second part of the flat tube may extend in a second plane, i.e. the first side surface of the second part may extend in a second plane.
  • the first plane and the second plane are parallel; however the first plane and the second plane may form an angle, e.g. an angle less than 45°. In a embodiment, the first plane and the second plane form an angle between 45° and 90°.
  • the flat tube may comprise a third part extending along a third axis.
  • a second bending may be comprised between the second part and the third part, for example such that the second angle between the second axis and the third axis is in the range from 0° to about 160°, such as from about 20° to about 160°, preferably from about 45° to about 135°, more preferably from about 60° to about 120°.
  • the second angle may be about 90°. In an embodiment, the second angle may be about 0°.
  • the flat tube may comprise a fourth part extending along a fourth axis.
  • a third bending may be comprised between the third part and the fourth part, for example such that the third angle between the third axis and the fourth axis is in the range from 0° to about 160°, such as from about 20° to about 160°, preferably from about 45° to about 135°, more preferably from about 60° to about 120°.
  • the third angle may be about 90°. In an embodiment, the third angle may be about 0°.
  • the flat tube may comprise a fifth part extending along a fifth axis.
  • a fourth bending may be comprised between the fourth part and the fifth part, for example such that the fourth angle between the fourth axis and the fifth axis is in the range from 0° to about 160°, such as from about 20° to about 160°, preferably from about 45° to about 135°, more preferably from about 60° to about 120°.
  • the fourth angle may be about 90°.
  • the flat tube of the cooling device may comprise one or more shift parts resulting in a parallel displacement of a part of the flat tube, e.g. from a first plane to a second plane parallel to the first plane.
  • One or more shift parts may be employed to design around one or more components of the electronic device, such as a hard drive or the like.
  • One or more shift parts may be employed, e.g. to facilitate connection of the flat tube and the first heat receiving part.
  • a shift part may result in a parallel displacement perpendicularly to the first side surface of two parts of the flat tube.
  • the flat tube of the cooling device may comprise one or more twist parts resulting in a rotation of a part of the flat tube around an axis.
  • the cooling device may comprise a connection member, e.g. a sleeve or jacket, for connecting or joining two ends of a flat tube, e.g. the first end and the second end of the flat tube.
  • the connection member may comprise a filling port enabling filling of the cooling device with cooling fluid.
  • the cooling device has only one or preferably no separate headers for the condenser which leads to reduced material and manufacturing costs.
  • the cooling device may comprise fins attached to the flat tube.
  • the fins increase the heat transfer between the cooling fluid and the fluid, e.g. air, surrounding the cooling device.
  • Primary fins may be attached to the first side surface of the flat tube and/or secondary fins may be attached to the second side surface of the flat tube.
  • the cooling device may comprise first primary fins attached to the first side surface of the first part and/or the cooling device may comprise first secondary fins attached to the second side surface of the first part.
  • the cooling device comprises second primary fins attached to the first side surface of the second part.
  • the cooling device may comprise second secondary fins attached to the second side surface of the second part.
  • the cooling device may comprise third primary fins attached to the first side surface of the third part and/or third secondary fins attached to the second side surface of the third part.
  • the cooling device may comprise fourth primary fins attached to the first side surface of the fourth part and/or fourth secondary fins attached to the second side surface of the fourth part.
  • the fins may be made of metal, such as aluminium, copper, alloys comprising aluminium and/or copper, a brass alloy or the like.
  • the fins may be attached to the flat tube by brazing (e.g. NOKOLOC brazing process or vacuum brazing) or other suitable processes.
  • the fins may each be formed by one or more sheets of folded or stretch shaped metal, e.g. an aluminium sheet with a thickness from about 0.05 mm to about 0.5 mm, e.g. 0.13 mm.
  • the fins may have a fin pitch ranging from about 1 to about 12 ribs/cm, such as 4 to 10 ribs/cm. In an embodiment, the fins have a fin pitch of about 7.5 ribs/cm.
  • the fins may have a depth (extension perpendicular to the side surface of the flat tube) from about 3 mm to about 10 mm. In an embodiment, the fin depth varies along a part of the flat tube, e.g. to utilize all available space in the electronic device.
  • the fin depth may be about 8 mm.
  • the fin height may be selected to correspond to the height of the flat tube, e.g. 22 mm for a flat tube having a height of 22 mm.
  • a fin height smaller or larger than the flat tube height may be employed. Fins having a first fin depth and first fin height and fins having a second fin depth and second fin height may be attached to the same side surface. Such fins may facilitate improved utilization of available envelope volume for the cooling device.
  • the cooling device may comprise one or more protective sheets. Accordingly, the cooling device may comprise one or more primary protective sheets arranged at the first side surface of the flat tube, e.g. attached to primary fins.
  • the cooling device may comprise one or more secondary protective sheets arranged at the second side surface of the flat tube, e.g. attached to secondary fins.
  • the protective sheets may be made of metal, e.g. aluminium or copper, or plastic.
  • the cooling device comprises one or more heat receiving parts including a first heat receiving part. The heat receiving parts are configured for absorbing heat from one or more heat sources and transfer the absorbed heat or parts thereof to the cooling fluid in the cooling device.
  • the first heat receiving part may have a first port and a second port forming inlet/outlet to one or more boiling chambers and/or evaporators in the first heat receiving part.
  • the first end of the flat tube may be connected to the first port in the first heat receiving part.
  • the second end of the flat tube may be connected to the second port in the first heat receiving part.
  • the first receiving part may comprise a filling port for filling the cooling device with cooling fluid.
  • the first heat receiving part may comprise a first plate attached to a part of the flat tube.
  • the first plate may be attached to the flat tube by brazing (e.g. NOKOLOC brazing process or vacuum brazing), gluing, soldering, welding, mechanical attachment, e.g. by clamping, or other suitable means.
  • the first heat receiving part may comprise a second plate attached to a part on the side surface opposite the first plate.
  • the second plate may be attached to the flat tube by brazing (e.g. NOKOLOC brazing process or vacuum brazing), gluing, soldering, welding, brazing, mechanical attachment, e.g. by clamping, or other suitable means.
  • the cooling device may comprise a second heat receiving part.
  • the second heat receiving part may have a first port and a second port forming inlet/outlet to one or more boiling chambers and/or evaporators in the first heat receiving part.
  • the first port of the second heat receiving part may be connected to the second port in the first heat receiving part, e.g. by a multiport flat tube or a tube.
  • the second end of the flat tube may be connected to the second port in the second heat receiving part.
  • the second heat receiving part may comprise a filling port for filling the cooling device with cooling fluid.
  • the second heat receiving part may comprise a first plate attached to a part of the flat tube.
  • the first plate may be attached to the flat tube by brazing (e.g. NOKOLOC brazing process or vacuum brazing), gluing, soldering, welding, mechanical attachment, e.g. by clamping, or other suitable means.
  • the second heat receiving part may comprise a second plate attached to a part on the side surface opposite the first plate.
  • the second plate may be attached to the flat tube by brazing (e.g. NOKOLOC brazing process or vacuum brazing), gluing, soldering, welding, mechanical attachment, e.g. by clamping, or other suitable means.
  • the cooling device may comprise further heat receiving parts, such as a third heat receiving part and/or a fourth heat receiving part.
  • a heat receiving part may receive heat emitted from one or a plurality of heat sources.
  • One or more heat sources may be attached directly onto a part of the flat tube, e.g. by gluing and/or mechanical attachment.
  • the cooling device may comprise one or more tubes connecting one or more ends of the flat tube to a heat receiving part.
  • a first tube may connect the first end of the flat tube to a port in a heat receiving part, e.g. a first port in the first heat receiving part.
  • the cooling device may comprise a header connecting an end of the flat tube and a tube.
  • the cooling device may comprise a first header connecting the first end of the flat tube to a first tube.
  • the tube may extend inside the header.
  • the cooling device may comprise one or more tubes connecting heat receiving parts to each other.
  • the cooling device may comprise a tube, e.g. a second tube, connecting the second end of the flat tube and a second port in the first heat receiving part.
  • the cooling device may comprise capillary material in the tube, the capillary material extending into the first heat receiving part.
  • the cooling device may be a double loop cooling device, i.e. the cooling device may comprise a secondary flat tube having a first side surface and a second side surface and extending from a first end to a second end.
  • the secondary flat tube may comprise a first part extending along a first secondary axis and a second part extending along a second secondary axis, and the secondary flat tube may comprise a first bending between the first part and the second part such that the first side surface of the first part faces the first side surface of the second part and the angle between the first secondary axis and the second secondary axis is in the range from about 20° to about 160°.
  • the operating pressure of the cooling device may be up to about 20 bar or more.
  • the cooling device may be a pressurised system, e.g. having a rest pressure (at 25°C) about 5 bar or about 6.5 bar.
  • the cooling fluid in the cooling device consists of a single fluid or comprises two or more fluids.
  • the fluids in the cooling fluid may be soluble within each other.
  • the cooling fluid may comprise one or more of water, ethanol, methanol, CO 2 , propane, isobutane, ammonia, fluorine compounds, such as 3M® FC72 and 3M® FC82, or other fluids having suitable thermal and physical properties.
  • cooling fluids include but are not limited to HydroFluoroEther (HFE) cooling fluids, such as 3M® HFE-7000, HFE-7100, HFE-72DA, or other cooling fluids, e.g. 1 ,1 ,1 ,2-Tetrafluoroethane (also known as R134A), 1 ,1 ,1 ,3-tetrafluoro-2-propene (also known as HFO 1234 ZE), trans-1 ,3,3,3-Tetraflouroprop-1-ene (HFO-1234ze, HBA-1 ) and the like.
  • HFE HydroFluoroEther
  • the cooling device of the present invention provides that heat may be transported over large distances compared to heat pipes. Furthermore, the cooling device according to the present invention enables low noise applications mainly due to low pressure drop through the cooling device.
  • the cooling device or parts thereof may be made of any suitable material.
  • the cooling device is made of metal, such as aluminium, copper, or alloys comprising one or more of aluminium, copper, brass alloys or the like.
  • a cooling device made of aluminium provides a light weight cooling device which is desirable in many applications.
  • the cooling device of the present invention enables transfer of a significantly larger heat volume in a single loop compared to heat pipes.
  • the cooling device is able to transfer up to or more than 150 W, such as up to about 200 W. It is an advantage of the present invention that a cooling device having a high Watt/Dollar ratio is provided.
  • Fig. 1 schematically illustrates an embodiment of the cooling device according to the present invention.
  • the cooling device 2 comprises a flat tube 4 having a first side surface 6 and a second side surface 8 and extending from a first end 10 to a second end 12. Further, the cooling device 2 comprises a first heat receiving part 14 having a first port connected to the first end 10 of the flat tube 4 and a second port connected to the second end 12 of the flat tube 4.
  • the flat tube 4 comprises a first part 16 extending along a first axis (line A), a second part 18 extending along a second axis (line B), and a first bending 20 between the first part 16 and the second part 18 such that the first side surface of the first part (not shown) faces the first side surface 6" of the second part and the first angle ⁇ i between the first axis A and the second axis B is about 90°.
  • the flat tube 4 of the cooling device 2 comprises a third part 22 extending along a third axis (line C), and a fourth part 24 extending along a fourth axis (line D).
  • the flat tube 4 comprises a second bending 26 between the second part 18 and the third part 22.
  • the second axis (B) and the third axis (C) form a second angle ⁇ 2 of about 90°.
  • the flat tube 4 comprises a third bending 28 between the third part 22 and the fourth part 24.
  • the third axis (C) and the fourth axis (D) form a third angle ⁇ 3 of about 90°.
  • the cooling device 2 comprises fins attached to the flat tube 4.
  • the cooling device comprises second primary fins (not shown) attached to the first side surface 6" of the second part 18, and optionally second secondary fins attached to the second side surface of the second part 18.
  • the first part 16 and the third part 22 extend substantially in a common first plane.
  • the second part 18 extend in a second plane, however the second part may in an embodiment extend along a suitable surface, e.g. a cylindrical surface.
  • first plane and the second plane are substantially parallel planes; however the first plane and the second plane may form any suitable angle less than 90°, such as 0° and about 45°.
  • cooling fluid in the cooling circulates in a closed loop from the first heat receiving part 14 via the first part 16 of the flat tube to the second part 18 where the cooling fluid is cooled and the condensed or cooled cooling fluid returns to the first receiving part via the third part and the fourth part of the flat tube.
  • the arrow indicates the direction of the cooling fluid flow.
  • Fig. 2 illustrates an embodiment of a cooling device according to the present invention.
  • the cooling device 102 comprises a fifth part 30 extending along a fifth axis (line E) and a fourth bending 32 between the fourth part 24 and the fifth part 30.
  • the fourth axis (D) and the fifth axis (E) form a fourth angle ⁇ 4 of about 90°.
  • the first axis A and the fifth axis E are substantially parallel.
  • Fig. 3 illustrates a flat tube 50 comprising an exemplary bending 52 with an angle a of 90° between two parts 54, 56 of the flat tube 50.
  • the part 54 extends along an axis 58 and the part 56 extends along an axis 60.
  • the flat tube 50 is bended by bending the flat tube around a bending axis 62 having an angle ⁇ of 45° with the axis 56.
  • the flat tube 50 is bended 180° around the bending axis such that the part 54 and the part 56 extend in two parallel planes with a distance D.
  • the first side surface 64 of the part 54 faces the first side surface (not visible) of the part 56 and the second side surface (not visible) of the part 54 faces away from the second side surface 66 of the part 56.
  • Fig. 4 illustrates a flat tube 50 comprising an exemplary bending 52' with an angle a of 120° between the two parts 54, 56 of the flat tube 50.
  • the part 54 extends along an axis 58 and the part 56 extends along an axis 60.
  • the flat tube 50 is bended by bending the flat tube around a bending axis 62 having an angle ⁇ of 30° with the axis 56.
  • the flat tube 50 is bended 180° around the bending axis 62 such that the part 54 and the part 56 extend in two parallel planes with a distance d.
  • Fig. 5 illustrates a flat tube 50 comprising an exemplary bending 52" with an angle a of 60° between the two parts 54, 56 of the flat tube 50.
  • the part 54 extends along an axis 58 and the part 56 extends along an axis 60.
  • the flat tube 50 is bended by bending the flat tube around a bending axis 62 having an angle ⁇ of 60° with the axis 56.
  • the flat tube 50 is bended 180° around the bending axis 62 such that the part 54 and the part 56 extend in two parallel planes with a distance d.
  • the angle a between the two parts 54, 56 is given by: a - 2(90 - ⁇ ) , wherein ⁇ is the angle between the bending axis 62 and the axis 58.
  • the first part extends in a first plane and the second part extends in a second plane parallel to the first plan and the distance d between the planes being as small as possible, e.g. less than 50 mm, preferably between 5 mm and 20 mm, such as about 10 mm.
  • the bending radius of a bending of the flat tube may be in the range from about 3 mm to about 10 mm.
  • the first bending radius of the first bending is about 4 mm.
  • a bending radius may be about 5 mm.
  • Different bending radii may be employed for different bendings.
  • a flat tube of the cooling device defines one or a plurality of channels, such as two, three, four, five, six, seven, eight, nine, ten, or more channels, e.g. twelve, fifteen, twenty or more channels.
  • Each channel may have a suitable cross section area, such as from about 0.1 mm 2 to about 10 mm 2 , preferably about 1 mm 2
  • the flat tube employed in the present invention has as small width as possible to reduce the cooling air flow resistance through the cooling device. At the same time a large surface area is desired in order to increase heat exchange between a cooling fluid in the flat tubes and the surrounding cooling air.
  • the flat tube may have a height/width ratio of more than two, preferably more than four, e.g. about ten or more.
  • the flat tube may have a height from about 1 mm to about 1000 mm, preferably in the range from about 5 mm to about 100 mm, such as about 12 mm, 16 mm, 22 mm or 32 mm.
  • the flat tube is desired to have as low a width as possible to reduce the air flow resistance as earlier described; however the width must be large enough to provide a sufficient cross section area for passing cooling fluid in the flat tube.
  • the at least one flat tube may have a width from about 1 mm to about 10 mm, such as from about 1.5 mm to about 3 mm, e.g. about 2 mm.
  • the flat tube may be a multiport tube, folded tube, pressed tube or the like.
  • Flat tube may be made of aluminium, copper, alloys thereof, brass alloys, or other suitable metal material.
  • Fig. 6 shows a cross section of an exemplary flat tube of a cooling device.
  • the flat tube 4 has a first side wall 70 with a first side surface 6 and a second side wall 72 with a second side surface 8.
  • the flat tube 4 has a height H of 22 mm and a width W of 2 mm.
  • the flat tube 6 comprises twelve channels; however a flat tube with eight or ten channels and the same height and width may be preferred. Table 1 shows possible flat tube configurations.
  • Fig. 7 illustrates a part of at cooling device according to the present invention.
  • the cooling device comprises second primary fins 74 attached to the first side surface 6 of the flat tube 4. Further, the cooling device comprises second secondary fins 76 attached to the second side surface 8 of the flat tube 4.
  • the first part 16 and the second part 22 extend in a first plane and the second part 18 extends in a second plane parallel to the first plane with a distance d of 8 mm.
  • the first axis A and the second axis B are parallel.
  • the second secondary fins 76 may be omitted.
  • Fig. 8 illustrates a part of at cooling device according to the present invention similar to the cooling device of Fig. 7.
  • the cooling device comprises a second primary protective sheet 78 arranged at the first side surface of the second part 18 of the flat tube 4 and attached to the second primary fins 74. Further, the cooling device comprises a second secondary protective sheet 80 arranged at the second side surface of the second part 18 of the flat tube 4 and attached to the second secondary fins 78.
  • Fig. 9 is a perspective view of an embodiment of the cooling device.
  • the flat tube 4 comprises a first shift part 82 between the first part 16 and a sixth part 84 resulting in a parallel displacement of the sixth part 84 from the first plane wherein the first part 16 extends to an intermediate plane parallel to the first plane having a distance d of about 4 mm. Further, the flat tube 4 comprises a second shift part 86 between the fourth part 24 and a seventh part 88 resulting in a parallel displacement of the seventh part 88 to the intermediate plane.
  • the flat tube has a height of 22 mm and a width of 2 mm with 12 channels.
  • Fig. 10 schematically illustrates an embodiment of a cooling device.
  • the cooling device 202 comprises a sleeve or jacket 90 for connecting or joining the first end 10 and the second end 12 of the flat tube 4.
  • the connection member 90 comprises a filling port enabling filling of the cooling device with cooling fluid.
  • the connection member 90 connects the first end 10 and the second end 12 of the cooling device enabling cooling fluid to flow from the first end 10 to the second end 12 thereby forming a closed loop cooling device.
  • the cooling device 202 comprises a first heat receiving part 14.
  • the first heat receiving part comprises a first plate and a. second plate soldered to the third part 22 as further illustrated in Fig. 11.
  • Fig. 11 is a schematically side view of a part of the cooling device 202 in Fig. 10.
  • the first heat receiving part 14 comprises a first plate 92 brazed, glued or soldered to the first side surface 6 of the flat tube. Further, the first heat receiving part 14 comprises a second plate 94 brazed, glued or soldered to the second side surface 8 of the flat tube. Additionally or alternatively, the first plate 92 and the second plate 94 may be mechanically fixed to the flat tube, e.g. by clamping. Mechanical attachment may improve design freedom. One of the first plate 92 or the second plate 94 may be omitted.
  • Fig. 12 schematically illustrates an embodiment of a cooling device.
  • the cooling device 302 comprises a second heat receiving part 96 having a first plate 92 and a second plate 94 as described in connection with Fig. 11.
  • the first part 16 and the fifth part 30 extend in the same plane.
  • Fig. 13 schematically illustrates an embodiment of a cooling device.
  • the cooling device 402 comprises a second heat receiving part 96 clamped around the fourth part 24 of the flat tube.
  • Fig. 14 schematically illustrates an embodiment of a cooling device.
  • the cooling device 502 has a first part 16 and a third part 22 extending in a first plane.
  • the first angle CT 1 is about 45° and the second angle ⁇ 2 is about 90°.
  • the cooling fluid flows in the direction of the arrow.
  • Fig. 15 schematically illustrates an embodiment of a cooling device.
  • the cooling device comprises a heat pipe 98 having a first end connected to the first heat receiving part and the second end connected to at second heat receiving part 96.
  • Fig. 16 schematically illustrates an embodiment of a cooling device.
  • the cooling device 702 is a double loop cooling device comprising two flat tubes 4, 4'.
  • the secondary flat tube 4' has a first end 10' connected to a third port in the first heat receiving part 14 and a second end 12' connected to a fourth port in the first heat receiving part 14.
  • the secondary flat tube 4' has three bendings and four parts as is described in connection with the flat tube 4.
  • Fig. 17 and Fig. 18 illustrate an embodiment of a cooling device in a first and second operating position.
  • the cooling device 802 comprises a tube 100 connecting the second end 12 of the flat tube 4 and the second port of the first heat receiving part 14.
  • the tube 100 may comprise capillary material, e.g. capillary wick material, groves, mesh or the like, thus allowing the cooling device 802 to operate with the first heat receiving part 14 above the rest of the cooling device as illustrated in Fig. 18.
  • capillary material extends into the first heat receiving part 14 enabling building of differential pressure over the capillary structure allowing cooling fluid to circulate in the desired direction and thus allows the cooling device to operate in the second operating position as illustrated in Fig. 18.
  • the capillary material in the tube 100 draws cooling fluid towards and into the first heat receiving part 14 by capillary action.
  • a filling port may be positioned in the tube 100, e.g. at the end connected to the second end 12 of the flat tube.
  • Fig. 19 illustrates a part of a cooling device of the present invention.
  • a part 104 of a flat tube e.g. first part 16, second part 18 and/or third part 22, has primary fins 74 attached to the first side surface of the part 104.
  • the primary fins 74 comprise fins 106 having a first fin depth, e.g. 5 mm and fins 108 having a second fin depth, e.g. 8 mm.
  • Fig. 20 illustrates a cooling device comprising third primary fins 110 attached to the first side surface 6 of the third part of the flat tube 4. Further, the cooling device comprises third secondary fins 112 attached to the second side surface 8 of the third part of the flat tube 4. The second secondary fins 76 and the third secondary fins 112 may be omitted.
  • the cooling devices 2, 102, 202, 302, 402, 502, 602, 702, 802 comprise fins (not shown) attached to the first side surface and/or to the second side surface of the flat tube, for example as illustrated in Fig. 7, Fig. 8, Fig. 19 and Fig. 20.
  • the flat tube of the cooling device may have a narrowing of the channels.
  • the narrowing may be positioned to ensure or facilitate the flow direction of the cooling fluid in the cooling device during operation.
  • the narrowing may be positioned near an end of the flat tube, e.g. near the second end of the flat tube.
  • the narrowing may be at least 1/3 of the channel size outside the narrowing.
  • Fig. 23 illustrates a cooling device.
  • the cooling device 902 comprises a flat tube 4 having a first side surface 6 and a second side surface 8 and extending from a first end 10 to a second end 12. Further, the cooling device 902 comprises a first heat receiving part 14 having a first port connected to a first tube 904 and a second port connected to the second end 12 of the flat tube 4. The first tube 904 is connected to the first end 10 of the flat tube 4.
  • the flat tube 4 comprises a first part 16 extending along a first axis (line A), a second part 18 extending along a second axis (line B), and a first bending 20 between the first part 16 and the second part 18 such that the first side surface 6" of the first part faces the first side surface (not shown) of the second part and the first angle a ⁇ between the first axis A and the second axis B is about 90°.
  • the flat tube 4 of the cooling device 902 comprises a third part 22 extending along a third axis (line C).
  • the flat tube 4 comprises a second bending 26 between the second part 18 and the third part 22.
  • the second axis (B) and the third axis (C) form a second angle a 2 of about 90°.
  • the cooling device 902 comprises fins attached to the flat tube 4.
  • the cooling device comprises first primary fins (not shown) attached to the first side surface 6" of the first part 16, and optionally first secondary fins attached to the second side surface of the first part 16.
  • the cooling device 902 comprises second primary fins (not shown) attached to the first side surface of the second part 18.
  • the first part 16 and the third part 22 extend substantially in a common first plane.
  • the second part 18 extend in a second plane, however the second part may in an embodiment extend along a suitable surface, e.g. a cylindrical surface.
  • the first tube 904 may have any suitable inner cross section, e.g. circular with a diameter larger than 2 mm, such as in the range from 2 mm to about 16 mm, such as in the range from 4 mm to about 10 mm.
  • Fig. 25 illustrates a cooling device.
  • the cooling device 1002 comprises a first header 1004 connecting the first end 10 of the flat tube and the first tube 904.
  • the first tube 904 extends into the cavity of the first header 1004 as illustrated by the dotted lines.
  • a cooling device comprising a flat tube having a first side surface and a second side surface and extending from a first end to a second end, and a first heat receiving part, wherein the flat tube comprises a first part extending along a first axis and a second part extending along a second axis, the flat tube further comprising a first bending between the first part and the second part such that the first side surface of the first part faces the first side surface of the second part and the first angle between the first axis and the second axis is in the range from about 20° to about 160°.
  • Item 2 A cooling device according to item 1 , wherein the flat tube comprises a third part extending along a third axis, and a second bending between the second part and the third part such that the second angle between the second axis and the third axis is in the range from 0° to about 160°.
  • Item 3 A cooling device according to item 2, wherein the flat tube comprises a fourth part extending along a fourth axis, and a third bending between the third part and the fourth part such that the third angle between the third axis and the fourth axis is in the range from 0° to about 160°.
  • a cooling device wherein the flat tube comprises a fifth part extending along a fifth axis, and a fourth bending between the fourth part and the fifth part such that the fourth angle between the fourth axis and the fifth axis is in the range from 0° to about 160°.
  • Item 5 A cooling device according to any of the items 1-4, wherein the cooling device comprises first primary fins attached to the first side surface of the first part.
  • Item 6 A cooling device according to any of the items 1-5, wherein the cooling device comprises first secondary fins attached to the second side surface of the first part.
  • Item 7 A cooling device according to any of the items 1-6, wherein the cooling device comprises second primary fins attached to the first side surface of the second part.
  • Item 8 A cooling device according to any of the items 1-7, wherein the cooling device comprises second secondary fins attached to the second side surface of the second part.
  • Item 9 A cooling device according to any of the items 1-8, wherein the cooling device comprises third primary fins attached to the first side surface of the third part.
  • Item 10 A cooling device according to any of the items 1-9, wherein the cooling device comprises third secondary fins attached to the second side surface of the third part.
  • Item 11 A cooling device according to any of the items 1-10, wherein the cooling device comprises a protective sheet arranged at a side surface of the flat tube.
  • a cooling device according to item 11 , wherein the cooling device comprises a second primary protective sheet arranged at the first side surface of the second part.
  • Item 13 A cooling device according to any of the items 1-12, wherein the cooling device comprises a connection member connecting two flat tube ends.
  • Item 14 A cooling device according to any of the items 1-13, wherein the first end of the flat tube is connected to a first port in the first heat receiving part. Item 15. A cooling device according to any of the items 1-14, wherein the second end of the flat tube is connected to a second port in the first heat receiving part. Item 16. A cooling device according to any of the items 1-14, wherein the cooling device comprises a tube connecting the second end of the flat tube and a second port in the first heat receiving part.
  • Item 17 A cooling device according to item 16, wherein the cooling device comprises capillary material in the tube, the capillary material extending into the first heat receiving part.
  • Item 18 A cooling device according to any of the items 1-13, wherein the first heat receiving part comprises a first plate attached to a part of the flat tube.
  • Item 19 A cooling device according to any of the items 1-18, wherein the cooling device comprises a second heat receiving part.
  • Item 20 A cooling device according to item 19, wherein the second heat receiving part has a first port connected to a second port in the first heat receiving part, and the second end of the flat tube is connected to a second port in the second heat receiving part.
  • Item 21 A cooling device according to any of the items 1-20, wherein the flat tube has a plurality of channels.
  • Item 22 A cooling device according to any of the items 1-21 , wherein the first side surface of the first part extends in a first plane.
  • Item 23 A cooling device according to any of the items 1-22, wherein the first side surface of the second part is a cylindrical surface.
  • Item 24 A cooling device according to any of the items 1-22, wherein the first side surface of the second part extends in a second plane.
  • Item 25 A cooling device according to any of the items 1-24, wherein the flat tube comprises at least one shift part resulting in a parallel displacement perpendicularly to the first side surface of two parts of the flat tube.
  • a cooling device comprising a secondary flat tube having a first side surface and a second side surface and extending from a first end to a second end, and wherein the secondary flat tube comprises a first part extending along a first secondary axis and a second part extending along a second secondary axis, the secondary flat tube further comprising a first bending between the first part and the second part such that the first side surface of the first part faces the first side surface of the second part and the angle between the first secondary axis and the second secondary axis is in the range from about 20° to about 160°.

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Abstract

A cooling device is disclosed, the cooling device comprising a flat tube having a first side surface and a second side surface and extending from a first end to a second end, the cooling device further comprising a first heat receiving part, wherein the flat tube comprises a first part extending along a first axis and a second part extending along a second axis, the flat tube further comprising a first bending between the first part and the second part such that the first side surface of the first part faces the first side surface of the second part and the first angle between the first axis and the second axis is in the range from about 20° to about 160°. Further, the flat tube comprises a third part extending along a third axis, and a second bending between the second part and the third part such that the second angle between the second axis and the third axis is in the range from 0° to about 160°.

Description

COOLING DEVICE WITH BENDED FLAT TUBE AND RELATED MANUFACTURING METHOD
The present invention relates to a cooling device for cooling electronic components, in particular a cooling device with a bended flat tube, and a method for manufacturing a cooling device.
There is a growing demand for cooling devices for cooling of electronic devices due to the increasing power consumption and consequently increased heat emission from such devices. Cooling devices for electronic devices are often limited in space due to e.g. cabinets and other units in the electronic device, and has to comply with strict rules of dimensions. Further, the directions of cooling air flow are limited due to the construction of the devices.
Accordingly, there is a need for reducing consumption of material for and dimensions of a cooling device.
It is an object of the present invention to provide a cooling device having small dimensions, e.g. a flat/thin cooling device.
Further, it is an object of the present invention to reduce the number of parts and/or material used in the manufacture of a cooling device.
In an aspect of the present invention, a cooling device is provided. The cooling device comprises a flat tube having a first side surface and a second side surface and extending from a first end to a second end. Further, the cooling device comprises a first heat receiving part, wherein the flat tube comprises a first part extending along a first axis and a second part extending along a second axis. The flat tube further comprises a first bending between the first part and the second part such that the first side surface of the first part faces the first side surface of the second part, and the first angle between the first axis and the second axis is in the range from about 20° to about 160°.
Further, a method for manufacturing a cooling device comprising a flat tube having a first side surface and a second side surface and extending from a first end to a second end, is provided, wherein the method comprises bending the flat tube such that the first side surface of a first part of the flat tube faces the first side surface of a second part of the flat tube and the angle between the first part and the second part is in the range from about 20° to about 160°.
The cooling device is in particular advantageous for applications where a thin cooling device is desirable, e.g. for flat screens, e.g. plasma screen or LCD screens, computers, e.g. all-in-one (AIO) computers, or servers, game consoles, and the like. BRIEF DESCRIPTION OF THE DRAWINGS
The above and other features and advantages of the present invention will become readily apparent to those skilled in the art by the following detailed description of exemplary embodiments thereof with reference to the attached drawings, in which:
Fig. 1 schematically illustrates an embodiment of a cooling device of the invention, Fig. 2 schematically illustrates an embodiment of a cooling device of the invention, Fig. 3 schematically illustrates an exemplary bending of a cooling device, Fig. 4 schematically illustrates an exemplary bending of a cooling device, Fig. 5 schematically illustrates an exemplary bending of a cooling device, Fig. 6 illustrates a cross section of a flat tube, Fig. 7 is a perspective view of a part of a cooling device, Fig. 8 is a perspective view of a part of a cooling device, Fig. 9 is a perspective view of a cooling device according to the present invention, Fig. 10 schematically illustrates an embodiment of a cooling device of the invention, Fig. 11 is a partial side view of the cooling device of Fig. 10, Fig. 12 schematically illustrates an embodiment of a cooling device of the invention, Fig. 13 schematically illustrates an embodiment of a cooling device of the invention, Fig. 14 schematically illustrates an embodiment of a cooling device of the invention, Fig. 15 schematically illustrates an embodiment of a cooling device of the invention, Fig. 16 schematically illustrates an embodiment of a cooling device of the invention,
Fig. 17 schematically illustrates an embodiment of a cooling device in a first operating position,
Fig. 18 illustrates the cooling device of Fig. 17 in a second operating position, Fig. 19 illustrates a part of a cooling device,
Fig. 20 illustrates an embodiment of the cooling device, Fig. 21 illustrates a cooling device used for test, Fig. 22 is a side view of the cooling device of Fig. 22, Fig. 23 illustrates an example of the cooling device, and Fig. 24 illustrates an example of the cooling device. DETAILED DESCRIPTION
The figures are schematic and simplified for clarity, and they merely show details which are essential to the understanding of the invention, while other details have been left out. Throughout, the same reference numerals are used for identical or corresponding parts.
The cooling device according to the present invention provides a cooling device with a low consumption of material. The cooling device of the present invention provides a high degree of design flexibility and has few components and thus few connecting points leading to simplified and more rapid manufacturing, which lower the costs of the cooling device.
The cooling device enables reduction of the number of part to be joined thereby reducing the number of connections in the cooling device, which is an advantage in production.
Preferably, one or more parts of the flat tube is/are straight and extend in a plane. The flat tube has a first side surface and a second side surface.
The first part of the flat tube may extend in a first plane, i.e. the first side surface of the first part may extend in a first plane. The second part of the flat tube may extend along a cylindrical surface, i.e. the first side surface of the second part may be a cylindrical surface. A cylindrical surface may facilitate improved utilization of available envelope volume for the cooling device.
The second part of the flat tube may extend in a second plane, i.e. the first side surface of the second part may extend in a second plane. Preferably, the first plane and the second plane are parallel; however the first plane and the second plane may form an angle, e.g. an angle less than 45°. In a embodiment, the first plane and the second plane form an angle between 45° and 90°.
The flat tube may comprise a third part extending along a third axis. A second bending may be comprised between the second part and the third part, for example such that the second angle between the second axis and the third axis is in the range from 0° to about 160°, such as from about 20° to about 160°, preferably from about 45° to about 135°, more preferably from about 60° to about 120°. The second angle may be about 90°. In an embodiment, the second angle may be about 0°.
The flat tube may comprise a fourth part extending along a fourth axis. A third bending may be comprised between the third part and the fourth part, for example such that the third angle between the third axis and the fourth axis is in the range from 0° to about 160°, such as from about 20° to about 160°, preferably from about 45° to about 135°, more preferably from about 60° to about 120°. The third angle may be about 90°. In an embodiment, the third angle may be about 0°.
The flat tube may comprise a fifth part extending along a fifth axis. A fourth bending may be comprised between the fourth part and the fifth part, for example such that the fourth angle between the fourth axis and the fifth axis is in the range from 0° to about 160°, such as from about 20° to about 160°, preferably from about 45° to about 135°, more preferably from about 60° to about 120°. The fourth angle may be about 90°.
The flat tube of the cooling device may comprise one or more shift parts resulting in a parallel displacement of a part of the flat tube, e.g. from a first plane to a second plane parallel to the first plane. One or more shift parts may be employed to design around one or more components of the electronic device, such as a hard drive or the like. One or more shift parts may be employed, e.g. to facilitate connection of the flat tube and the first heat receiving part. A shift part may result in a parallel displacement perpendicularly to the first side surface of two parts of the flat tube.
The flat tube of the cooling device may comprise one or more twist parts resulting in a rotation of a part of the flat tube around an axis.
The cooling device may comprise a connection member, e.g. a sleeve or jacket, for connecting or joining two ends of a flat tube, e.g. the first end and the second end of the flat tube. The connection member may comprise a filling port enabling filling of the cooling device with cooling fluid.
The cooling device according to the present invention has only one or preferably no separate headers for the condenser which leads to reduced material and manufacturing costs. The cooling device may comprise fins attached to the flat tube. The fins increase the heat transfer between the cooling fluid and the fluid, e.g. air, surrounding the cooling device. Primary fins may be attached to the first side surface of the flat tube and/or secondary fins may be attached to the second side surface of the flat tube. For example, the cooling device may comprise first primary fins attached to the first side surface of the first part and/or the cooling device may comprise first secondary fins attached to the second side surface of the first part.
Preferably, the cooling device comprises second primary fins attached to the first side surface of the second part. The cooling device may comprise second secondary fins attached to the second side surface of the second part.
The cooling device may comprise third primary fins attached to the first side surface of the third part and/or third secondary fins attached to the second side surface of the third part.
The cooling device may comprise fourth primary fins attached to the first side surface of the fourth part and/or fourth secondary fins attached to the second side surface of the fourth part.
The fins may be made of metal, such as aluminium, copper, alloys comprising aluminium and/or copper, a brass alloy or the like. The fins may be attached to the flat tube by brazing (e.g. NOKOLOC brazing process or vacuum brazing) or other suitable processes.
The fins may each be formed by one or more sheets of folded or stretch shaped metal, e.g. an aluminium sheet with a thickness from about 0.05 mm to about 0.5 mm, e.g. 0.13 mm. The fins may have a fin pitch ranging from about 1 to about 12 ribs/cm, such as 4 to 10 ribs/cm. In an embodiment, the fins have a fin pitch of about 7.5 ribs/cm. The fins may have a depth (extension perpendicular to the side surface of the flat tube) from about 3 mm to about 10 mm. In an embodiment, the fin depth varies along a part of the flat tube, e.g. to utilize all available space in the electronic device. In an embodiment the fin depth may be about 8 mm. The fin height may be selected to correspond to the height of the flat tube, e.g. 22 mm for a flat tube having a height of 22 mm. A fin height smaller or larger than the flat tube height may be employed. Fins having a first fin depth and first fin height and fins having a second fin depth and second fin height may be attached to the same side surface. Such fins may facilitate improved utilization of available envelope volume for the cooling device.
The cooling device may comprise one or more protective sheets. Accordingly, the cooling device may comprise one or more primary protective sheets arranged at the first side surface of the flat tube, e.g. attached to primary fins. The cooling device may comprise one or more secondary protective sheets arranged at the second side surface of the flat tube, e.g. attached to secondary fins. The protective sheets may be made of metal, e.g. aluminium or copper, or plastic. The cooling device comprises one or more heat receiving parts including a first heat receiving part. The heat receiving parts are configured for absorbing heat from one or more heat sources and transfer the absorbed heat or parts thereof to the cooling fluid in the cooling device. The first heat receiving part may have a first port and a second port forming inlet/outlet to one or more boiling chambers and/or evaporators in the first heat receiving part. The first end of the flat tube may be connected to the first port in the first heat receiving part. The second end of the flat tube may be connected to the second port in the first heat receiving part. The first receiving part may comprise a filling port for filling the cooling device with cooling fluid.
The first heat receiving part may comprise a first plate attached to a part of the flat tube. The first plate may be attached to the flat tube by brazing (e.g. NOKOLOC brazing process or vacuum brazing), gluing, soldering, welding, mechanical attachment, e.g. by clamping, or other suitable means. The first heat receiving part may comprise a second plate attached to a part on the side surface opposite the first plate. The second plate may be attached to the flat tube by brazing (e.g. NOKOLOC brazing process or vacuum brazing), gluing, soldering, welding, brazing, mechanical attachment, e.g. by clamping, or other suitable means.
The cooling device may comprise a second heat receiving part. The second heat receiving part may have a first port and a second port forming inlet/outlet to one or more boiling chambers and/or evaporators in the first heat receiving part. The first port of the second heat receiving part may be connected to the second port in the first heat receiving part, e.g. by a multiport flat tube or a tube. The second end of the flat tube may be connected to the second port in the second heat receiving part. The second heat receiving part may comprise a filling port for filling the cooling device with cooling fluid.
The second heat receiving part may comprise a first plate attached to a part of the flat tube. The first plate may be attached to the flat tube by brazing (e.g. NOKOLOC brazing process or vacuum brazing), gluing, soldering, welding, mechanical attachment, e.g. by clamping, or other suitable means.
The second heat receiving part may comprise a second plate attached to a part on the side surface opposite the first plate. The second plate may be attached to the flat tube by brazing (e.g. NOKOLOC brazing process or vacuum brazing), gluing, soldering, welding, mechanical attachment, e.g. by clamping, or other suitable means. The cooling device may comprise further heat receiving parts, such as a third heat receiving part and/or a fourth heat receiving part.
A heat receiving part may receive heat emitted from one or a plurality of heat sources.
One or more heat sources, e.g. including one or more low power heat sources (<30 W), may be attached directly onto a part of the flat tube, e.g. by gluing and/or mechanical attachment.
The cooling device may comprise one or more tubes connecting one or more ends of the flat tube to a heat receiving part. A first tube may connect the first end of the flat tube to a port in a heat receiving part, e.g. a first port in the first heat receiving part. The cooling device may comprise a header connecting an end of the flat tube and a tube. For example, the cooling device may comprise a first header connecting the first end of the flat tube to a first tube. The tube may extend inside the header.
The cooling device may comprise one or more tubes connecting heat receiving parts to each other. The cooling device may comprise a tube, e.g. a second tube, connecting the second end of the flat tube and a second port in the first heat receiving part. The cooling device may comprise capillary material in the tube, the capillary material extending into the first heat receiving part.
The cooling device may be a double loop cooling device, i.e. the cooling device may comprise a secondary flat tube having a first side surface and a second side surface and extending from a first end to a second end. The secondary flat tube may comprise a first part extending along a first secondary axis and a second part extending along a second secondary axis, and the secondary flat tube may comprise a first bending between the first part and the second part such that the first side surface of the first part faces the first side surface of the second part and the angle between the first secondary axis and the second secondary axis is in the range from about 20° to about 160°.
Use of a multiport flat tube provides a cooling device able to operate at a relatively high pressure enabling use of a wide range of cooling fluids. The operating pressure of the cooling device may be up to about 20 bar or more. The cooling device may be a pressurised system, e.g. having a rest pressure (at 25°C) about 5 bar or about 6.5 bar.
The cooling fluid in the cooling device consists of a single fluid or comprises two or more fluids. The fluids in the cooling fluid may be soluble within each other. The cooling fluid may comprise one or more of water, ethanol, methanol, CO2, propane, isobutane, ammonia, fluorine compounds, such as 3M® FC72 and 3M® FC82, or other fluids having suitable thermal and physical properties.
Examples of cooling fluids include but are not limited to HydroFluoroEther (HFE) cooling fluids, such as 3M® HFE-7000, HFE-7100, HFE-72DA, or other cooling fluids, e.g. 1 ,1 ,1 ,2-Tetrafluoroethane (also known as R134A), 1 ,1 ,1 ,3-tetrafluoro-2-propene (also known as HFO 1234 ZE), trans-1 ,3,3,3-Tetraflouroprop-1-ene (HFO-1234ze, HBA-1 ) and the like.
The cooling device of the present invention provides that heat may be transported over large distances compared to heat pipes. Furthermore, the cooling device according to the present invention enables low noise applications mainly due to low pressure drop through the cooling device.
The cooling device or parts thereof may be made of any suitable material. Preferably, the cooling device is made of metal, such as aluminium, copper, or alloys comprising one or more of aluminium, copper, brass alloys or the like. In particular, a cooling device made of aluminium provides a light weight cooling device which is desirable in many applications.
The cooling device of the present invention enables transfer of a significantly larger heat volume in a single loop compared to heat pipes. In an embodiment, the cooling device is able to transfer up to or more than 150 W, such as up to about 200 W. It is an advantage of the present invention that a cooling device having a high Watt/Dollar ratio is provided.
Fig. 1 schematically illustrates an embodiment of the cooling device according to the present invention. The cooling device 2 comprises a flat tube 4 having a first side surface 6 and a second side surface 8 and extending from a first end 10 to a second end 12. Further, the cooling device 2 comprises a first heat receiving part 14 having a first port connected to the first end 10 of the flat tube 4 and a second port connected to the second end 12 of the flat tube 4. The flat tube 4 comprises a first part 16 extending along a first axis (line A), a second part 18 extending along a second axis (line B), and a first bending 20 between the first part 16 and the second part 18 such that the first side surface of the first part (not shown) faces the first side surface 6" of the second part and the first angle αi between the first axis A and the second axis B is about 90°. Further, the flat tube 4 of the cooling device 2 comprises a third part 22 extending along a third axis (line C), and a fourth part 24 extending along a fourth axis (line D). The flat tube 4 comprises a second bending 26 between the second part 18 and the third part 22. The second axis (B) and the third axis (C) form a second angle σ2of about 90°. In the embodiment of the cooling device in Fig. 1 , the flat tube 4 comprises a third bending 28 between the third part 22 and the fourth part 24. The third axis (C) and the fourth axis (D) form a third angle σ3of about 90°. The cooling device 2 comprises fins attached to the flat tube 4. The cooling device comprises second primary fins (not shown) attached to the first side surface 6" of the second part 18, and optionally second secondary fins attached to the second side surface of the second part 18. Preferably, the first part 16 and the third part 22 extend substantially in a common first plane. Preferably, the second part 18 extend in a second plane, however the second part may in an embodiment extend along a suitable surface, e.g. a cylindrical surface.
Preferably, the first plane and the second plane are substantially parallel planes; however the first plane and the second plane may form any suitable angle less than 90°, such as 0° and about 45°.
During use of the cooling device 2, cooling fluid in the cooling circulates in a closed loop from the first heat receiving part 14 via the first part 16 of the flat tube to the second part 18 where the cooling fluid is cooled and the condensed or cooled cooling fluid returns to the first receiving part via the third part and the fourth part of the flat tube. The arrow indicates the direction of the cooling fluid flow.
Fig. 2 illustrates an embodiment of a cooling device according to the present invention. In addition to the elements described in relation to the cooling device 2, the cooling device 102 comprises a fifth part 30 extending along a fifth axis (line E) and a fourth bending 32 between the fourth part 24 and the fifth part 30. The fourth axis (D) and the fifth axis (E) form a fourth angle σ4of about 90°. The first axis A and the fifth axis E are substantially parallel. Fig. 3 illustrates a flat tube 50 comprising an exemplary bending 52 with an angle a of 90° between two parts 54, 56 of the flat tube 50. The part 54 extends along an axis 58 and the part 56 extends along an axis 60. The flat tube 50 is bended by bending the flat tube around a bending axis 62 having an angle β of 45° with the axis 56. The flat tube 50 is bended 180° around the bending axis such that the part 54 and the part 56 extend in two parallel planes with a distance D. The first side surface 64 of the part 54 faces the first side surface (not visible) of the part 56 and the second side surface (not visible) of the part 54 faces away from the second side surface 66 of the part 56.
Fig. 4 illustrates a flat tube 50 comprising an exemplary bending 52' with an angle a of 120° between the two parts 54, 56 of the flat tube 50. The part 54 extends along an axis 58 and the part 56 extends along an axis 60. The flat tube 50 is bended by bending the flat tube around a bending axis 62 having an angle β of 30° with the axis 56. The flat tube 50 is bended 180° around the bending axis 62 such that the part 54 and the part 56 extend in two parallel planes with a distance d.
Fig. 5 illustrates a flat tube 50 comprising an exemplary bending 52" with an angle a of 60° between the two parts 54, 56 of the flat tube 50. The part 54 extends along an axis 58 and the part 56 extends along an axis 60. The flat tube 50 is bended by bending the flat tube around a bending axis 62 having an angle β of 60° with the axis 56. The flat tube 50 is bended 180° around the bending axis 62 such that the part 54 and the part 56 extend in two parallel planes with a distance d. The angle a between the two parts 54, 56 is given by: a - 2(90 - β) , wherein β is the angle between the bending axis 62 and the axis 58.
In a preferred embodiment where a thin cooling device is desired, the first part extends in a first plane and the second part extends in a second plane parallel to the first plan and the distance d between the planes being as small as possible, e.g. less than 50 mm, preferably between 5 mm and 20 mm, such as about 10 mm.
The bending radius of a bending of the flat tube may be in the range from about 3 mm to about 10 mm. In an embodiment, the first bending radius of the first bending is about 4 mm. In an embodiment, a bending radius may be about 5 mm. Different bending radii may be employed for different bendings. A flat tube of the cooling device defines one or a plurality of channels, such as two, three, four, five, six, seven, eight, nine, ten, or more channels, e.g. twelve, fifteen, twenty or more channels. Each channel may have a suitable cross section area, such as from about 0.1 mm2 to about 10 mm2, preferably about 1 mm2
Preferably, the flat tube employed in the present invention has as small width as possible to reduce the cooling air flow resistance through the cooling device. At the same time a large surface area is desired in order to increase heat exchange between a cooling fluid in the flat tubes and the surrounding cooling air.
Accordingly, the flat tube may have a height/width ratio of more than two, preferably more than four, e.g. about ten or more. The flat tube may have a height from about 1 mm to about 1000 mm, preferably in the range from about 5 mm to about 100 mm, such as about 12 mm, 16 mm, 22 mm or 32 mm.
In general, the flat tube is desired to have as low a width as possible to reduce the air flow resistance as earlier described; however the width must be large enough to provide a sufficient cross section area for passing cooling fluid in the flat tube. The at least one flat tube may have a width from about 1 mm to about 10 mm, such as from about 1.5 mm to about 3 mm, e.g. about 2 mm.
The flat tube may be a multiport tube, folded tube, pressed tube or the like.
Flat tube may be made of aluminium, copper, alloys thereof, brass alloys, or other suitable metal material.
Fig. 6 shows a cross section of an exemplary flat tube of a cooling device. The flat tube 4 has a first side wall 70 with a first side surface 6 and a second side wall 72 with a second side surface 8. The flat tube 4 has a height H of 22 mm and a width W of 2 mm. The flat tube 6 comprises twelve channels; however a flat tube with eight or ten channels and the same height and width may be preferred. Table 1 shows possible flat tube configurations.
Figure imgf000012_0001
Table 1. Flat tube configurations
Fig. 7 illustrates a part of at cooling device according to the present invention. The cooling device comprises second primary fins 74 attached to the first side surface 6 of the flat tube 4. Further, the cooling device comprises second secondary fins 76 attached to the second side surface 8 of the flat tube 4. The first part 16 and the second part 22 extend in a first plane and the second part 18 extends in a second plane parallel to the first plane with a distance d of 8 mm. The first axis A and the second axis B are parallel. The second secondary fins 76 may be omitted.
Fig. 8 illustrates a part of at cooling device according to the present invention similar to the cooling device of Fig. 7. The cooling device comprises a second primary protective sheet 78 arranged at the first side surface of the second part 18 of the flat tube 4 and attached to the second primary fins 74. Further, the cooling device comprises a second secondary protective sheet 80 arranged at the second side surface of the second part 18 of the flat tube 4 and attached to the second secondary fins 78.
Fig. 9 is a perspective view of an embodiment of the cooling device. The flat tube 4 comprises a first shift part 82 between the first part 16 and a sixth part 84 resulting in a parallel displacement of the sixth part 84 from the first plane wherein the first part 16 extends to an intermediate plane parallel to the first plane having a distance d of about 4 mm. Further, the flat tube 4 comprises a second shift part 86 between the fourth part 24 and a seventh part 88 resulting in a parallel displacement of the seventh part 88 to the intermediate plane. The flat tube has a height of 22 mm and a width of 2 mm with 12 channels.
Fig. 10 schematically illustrates an embodiment of a cooling device. The cooling device 202 comprises a sleeve or jacket 90 for connecting or joining the first end 10 and the second end 12 of the flat tube 4. The connection member 90 comprises a filling port enabling filling of the cooling device with cooling fluid. The connection member 90 connects the first end 10 and the second end 12 of the cooling device enabling cooling fluid to flow from the first end 10 to the second end 12 thereby forming a closed loop cooling device. The cooling device 202 comprises a first heat receiving part 14. In the cooling device 202, the first heat receiving part comprises a first plate and a. second plate soldered to the third part 22 as further illustrated in Fig. 11.
Fig. 11 is a schematically side view of a part of the cooling device 202 in Fig. 10. The first heat receiving part 14 comprises a first plate 92 brazed, glued or soldered to the first side surface 6 of the flat tube. Further, the first heat receiving part 14 comprises a second plate 94 brazed, glued or soldered to the second side surface 8 of the flat tube. Additionally or alternatively, the first plate 92 and the second plate 94 may be mechanically fixed to the flat tube, e.g. by clamping. Mechanical attachment may improve design freedom. One of the first plate 92 or the second plate 94 may be omitted.
Fig. 12 schematically illustrates an embodiment of a cooling device. The cooling device 302 comprises a second heat receiving part 96 having a first plate 92 and a second plate 94 as described in connection with Fig. 11. The first part 16 and the fifth part 30 extend in the same plane.
Fig. 13 schematically illustrates an embodiment of a cooling device. The cooling device 402 comprises a second heat receiving part 96 clamped around the fourth part 24 of the flat tube. Fig. 14 schematically illustrates an embodiment of a cooling device. The cooling device 502 has a first part 16 and a third part 22 extending in a first plane. The first angle CT1 is about 45° and the second angle σ2 is about 90°. The cooling fluid flows in the direction of the arrow. Fig. 15 schematically illustrates an embodiment of a cooling device. The cooling device comprises a heat pipe 98 having a first end connected to the first heat receiving part and the second end connected to at second heat receiving part 96.
Fig. 16 schematically illustrates an embodiment of a cooling device. The cooling device 702 is a double loop cooling device comprising two flat tubes 4, 4'. The secondary flat tube 4' has a first end 10' connected to a third port in the first heat receiving part 14 and a second end 12' connected to a fourth port in the first heat receiving part 14. The secondary flat tube 4' has three bendings and four parts as is described in connection with the flat tube 4.
Fig. 17 and Fig. 18 illustrate an embodiment of a cooling device in a first and second operating position. The cooling device 802 comprises a tube 100 connecting the second end 12 of the flat tube 4 and the second port of the first heat receiving part 14. The tube 100 may comprise capillary material, e.g. capillary wick material, groves, mesh or the like, thus allowing the cooling device 802 to operate with the first heat receiving part 14 above the rest of the cooling device as illustrated in Fig. 18. Further, capillary material extends into the first heat receiving part 14 enabling building of differential pressure over the capillary structure allowing cooling fluid to circulate in the desired direction and thus allows the cooling device to operate in the second operating position as illustrated in Fig. 18. The capillary material in the tube 100 draws cooling fluid towards and into the first heat receiving part 14 by capillary action. A filling port may be positioned in the tube 100, e.g. at the end connected to the second end 12 of the flat tube.
Fig. 19 illustrates a part of a cooling device of the present invention. A part 104 of a flat tube, e.g. first part 16, second part 18 and/or third part 22, has primary fins 74 attached to the first side surface of the part 104. The primary fins 74 comprise fins 106 having a first fin depth, e.g. 5 mm and fins 108 having a second fin depth, e.g. 8 mm.
Fig. 20 illustrates a cooling device comprising third primary fins 110 attached to the first side surface 6 of the third part of the flat tube 4. Further, the cooling device comprises third secondary fins 112 attached to the second side surface 8 of the third part of the flat tube 4. The second secondary fins 76 and the third secondary fins 112 may be omitted. The cooling devices 2, 102, 202, 302, 402, 502, 602, 702, 802 comprise fins (not shown) attached to the first side surface and/or to the second side surface of the flat tube, for example as illustrated in Fig. 7, Fig. 8, Fig. 19 and Fig. 20.
The flat tube of the cooling device may have a narrowing of the channels. The narrowing may be positioned to ensure or facilitate the flow direction of the cooling fluid in the cooling device during operation. The narrowing may be positioned near an end of the flat tube, e.g. near the second end of the flat tube. The narrowing may be at least 1/3 of the channel size outside the narrowing.
EXAMPLE
Tests have been conducted with a cooling device as illustrated in Fig. 21 and Fig. 22 with HBA-1 as cooling fluid. A blower (AVC model BA10033B12M - 100x33mm) was driven at 12 V to provide air flow as illustrated. Second primary and secondary fins having height of 22 mm and fin depth of 8 mm were employed. Table 2 below shows result obtained, where P1 is the power delivered to the first heat receiving part, P2 is the power delivered to the second heat receiving part, T1 is the temperature of the first heat receiving part, T2 is the temperature of the second heat receiving part, T3 is the inlet condenser temperature as illustrated in Fig. 21 , T4 is the outlet condenser temperature, and T5 is the external ambient inlet temperature.
Figure imgf000015_0001
Table 2. Test results
Fig. 23 illustrates a cooling device. The cooling device 902 comprises a flat tube 4 having a first side surface 6 and a second side surface 8 and extending from a first end 10 to a second end 12. Further, the cooling device 902 comprises a first heat receiving part 14 having a first port connected to a first tube 904 and a second port connected to the second end 12 of the flat tube 4. The first tube 904 is connected to the first end 10 of the flat tube 4. The flat tube 4 comprises a first part 16 extending along a first axis (line A), a second part 18 extending along a second axis (line B), and a first bending 20 between the first part 16 and the second part 18 such that the first side surface 6" of the first part faces the first side surface (not shown) of the second part and the first angle aλ between the first axis A and the second axis B is about 90°. Further, the flat tube 4 of the cooling device 902 comprises a third part 22 extending along a third axis (line C). The flat tube 4 comprises a second bending 26 between the second part 18 and the third part 22. The second axis (B) and the third axis (C) form a second angle a2 of about 90°. The cooling device 902 comprises fins attached to the flat tube 4. The cooling device comprises first primary fins (not shown) attached to the first side surface 6" of the first part 16, and optionally first secondary fins attached to the second side surface of the first part 16. Optionally, the cooling device 902 comprises second primary fins (not shown) attached to the first side surface of the second part 18. Preferably, the first part 16 and the third part 22 extend substantially in a common first plane. Preferably, the second part 18 extend in a second plane, however the second part may in an embodiment extend along a suitable surface, e.g. a cylindrical surface. The first tube 904 may have any suitable inner cross section, e.g. circular with a diameter larger than 2 mm, such as in the range from 2 mm to about 16 mm, such as in the range from 4 mm to about 10 mm.
Fig. 25 illustrates a cooling device. The cooling device 1002 comprises a first header 1004 connecting the first end 10 of the flat tube and the first tube 904. The first tube 904 extends into the cavity of the first header 1004 as illustrated by the dotted lines.
It should be noted that in addition to the exemplary embodiments of the invention shown in the accompanying drawings, the invention may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art.
Also disclosed is a cooling device according to any of the following items. Item 1. A cooling device comprising a flat tube having a first side surface and a second side surface and extending from a first end to a second end, and a first heat receiving part, wherein the flat tube comprises a first part extending along a first axis and a second part extending along a second axis, the flat tube further comprising a first bending between the first part and the second part such that the first side surface of the first part faces the first side surface of the second part and the first angle between the first axis and the second axis is in the range from about 20° to about 160°.
Item 2. A cooling device according to item 1 , wherein the flat tube comprises a third part extending along a third axis, and a second bending between the second part and the third part such that the second angle between the second axis and the third axis is in the range from 0° to about 160°. Item 3. A cooling device according to item 2, wherein the flat tube comprises a fourth part extending along a fourth axis, and a third bending between the third part and the fourth part such that the third angle between the third axis and the fourth axis is in the range from 0° to about 160°. Item 4. A cooling device according to item 3, wherein the flat tube comprises a fifth part extending along a fifth axis, and a fourth bending between the fourth part and the fifth part such that the fourth angle between the fourth axis and the fifth axis is in the range from 0° to about 160°.
Item 5. A cooling device according to any of the items 1-4, wherein the cooling device comprises first primary fins attached to the first side surface of the first part.
Item 6. A cooling device according to any of the items 1-5, wherein the cooling device comprises first secondary fins attached to the second side surface of the first part.
Item 7. A cooling device according to any of the items 1-6, wherein the cooling device comprises second primary fins attached to the first side surface of the second part. Item 8. A cooling device according to any of the items 1-7, wherein the cooling device comprises second secondary fins attached to the second side surface of the second part.
Item 9. A cooling device according to any of the items 1-8, wherein the cooling device comprises third primary fins attached to the first side surface of the third part. Item 10. A cooling device according to any of the items 1-9, wherein the cooling device comprises third secondary fins attached to the second side surface of the third part.
Item 11. A cooling device according to any of the items 1-10, wherein the cooling device comprises a protective sheet arranged at a side surface of the flat tube.
Item 12. A cooling device according to item 11 , wherein the cooling device comprises a second primary protective sheet arranged at the first side surface of the second part.
Item 13. A cooling device according to any of the items 1-12, wherein the cooling device comprises a connection member connecting two flat tube ends.
Item 14. A cooling device according to any of the items 1-13, wherein the first end of the flat tube is connected to a first port in the first heat receiving part. Item 15. A cooling device according to any of the items 1-14, wherein the second end of the flat tube is connected to a second port in the first heat receiving part. Item 16. A cooling device according to any of the items 1-14, wherein the cooling device comprises a tube connecting the second end of the flat tube and a second port in the first heat receiving part.
Item 17. A cooling device according to item 16, wherein the cooling device comprises capillary material in the tube, the capillary material extending into the first heat receiving part.
Item 18. A cooling device according to any of the items 1-13, wherein the first heat receiving part comprises a first plate attached to a part of the flat tube.
Item 19. A cooling device according to any of the items 1-18, wherein the cooling device comprises a second heat receiving part.
Item 20. A cooling device according to item 19, wherein the second heat receiving part has a first port connected to a second port in the first heat receiving part, and the second end of the flat tube is connected to a second port in the second heat receiving part. Item 21. A cooling device according to any of the items 1-20, wherein the flat tube has a plurality of channels.
Item 22. A cooling device according to any of the items 1-21 , wherein the first side surface of the first part extends in a first plane.
Item 23. A cooling device according to any of the items 1-22, wherein the first side surface of the second part is a cylindrical surface.
Item 24. A cooling device according to any of the items 1-22, wherein the first side surface of the second part extends in a second plane.
Item 25. A cooling device according to any of the items 1-24, wherein the flat tube comprises at least one shift part resulting in a parallel displacement perpendicularly to the first side surface of two parts of the flat tube.
Item 26. A cooling device according to any of the items 1-25, comprising a secondary flat tube having a first side surface and a second side surface and extending from a first end to a second end, and wherein the secondary flat tube comprises a first part extending along a first secondary axis and a second part extending along a second secondary axis, the secondary flat tube further comprising a first bending between the first part and the second part such that the first side surface of the first part faces the first side surface of the second part and the angle between the first secondary axis and the second secondary axis is in the range from about 20° to about 160°.

Claims

1. A cooling device comprising
- a flat tube having a first side surface and a second side surface and extending from a first end to a second end, and - a first heat receiving part, wherein the flat tube comprises a first part extending along a first axis and a second part extending along a second axis, the flat tube further comprising a first bending between the first part and the second part such that the first side surface of the first part faces the first side surface of the second part and the first angle between the first axis and the second axis is in the range from about 20° to about 160°, wherein the flat tube comprises a third part extending along a third axis, and a second bending between the second part and the third part such that the second angle between the second axis and the third axis is in the range from 0° to about 160°.
2. A cooling device according to claim 1 , wherein the flat tube comprises a fourth part extending along a fourth axis, and a third bending between the third part and the fourth part such that the third angle between the third axis and the fourth axis is in the range from 0° to about 160°.
3. A cooling device according to claim 2, wherein the flat tube comprises a fifth part extending along a fifth axis, and a fourth bending between the fourth part and the fifth part such that the fourth angle between the fourth axis and the fifth axis is in the range from 0° to about 160°.
4. A cooling device according to any of the preceding claims, wherein the cooling device comprises first primary fins attached to the first side surface of the first part.
5. A cooling device according to any of the preceding claims, wherein the cooling device comprises first secondary fins attached to the second side surface of the first part.
6. A cooling device according to any of the preceding claims, wherein the cooling device comprises second primary fins attached to the first side surface of the second part.
7. A cooling device according to any of the preceding claims, wherein the cooling device comprises second secondary fins attached to the second side surface of the second part.
8. A cooling device according to any of the preceding claims, wherein the cooling device comprises third primary fins attached to the first side surface of the third part.
9. A cooling device according to any of the preceding claims, wherein the cooling device comprises third secondary fins attached to the second side surface of the third part.
10. A cooling device according to any of the preceding claims, wherein the cooling device comprises a protective sheet arranged at a side surface of the flat tube.
11. A cooling device according to claim 10, wherein the cooling device comprises a second primary protective sheet arranged at the first side surface of the second part.
12. A cooling device according to any of the preceding claims, wherein the cooling device comprises a connection member connecting two flat tube ends.
13. A cooling device according to any of the preceding claims, wherein the first end of the flat tube is connected to a first port in the first heat receiving part.
14. A cooling device according to any of the preceding claims, wherein the second end of the flat tube is connected to a second port in the first heat receiving part.
15. A cooling device according to any of the claims 1-13, wherein the cooling device comprises a tube connecting the second end of the flat tube and a second port in the first heat receiving part.
16. A cooling device according to claim 15, wherein the cooling device comprises capillary material in the tube, the capillary material extending into the first heat receiving part.
17. A cooling device according to any of the claims 1-13, wherein the first heat receiving part comprises a first plate attached to a part of the flat tube.
18. A cooling device according to any of the preceding claims, wherein the cooling device comprises a second heat receiving part.
19. A cooling device according to claim 18, wherein the second heat receiving part has a first port connected to a second port in the first heat receiving part, and the second end of the flat tube is connected to a second port in the second heat receiving part.
20. A cooling device according to any of the preceding claims, wherein the flat tube has a plurality of channels.
21. A cooling device according to any of the preceding claims, wherein the first side surface of the first part extends in a first plane.
22. A cooling device according to any of the preceding claims, wherein the first side surface of the second part is a cylindrical surface.
23. A cooling device according to any of the preceding claims, wherein the first side surface of the second part extends in a second plane.
24. A cooling device according to any of the preceding claims, wherein the flat tube comprises at least one shift part resulting in a parallel displacement perpendicularly to the first side surface of two parts of the flat tube.
25. A cooling device according to any of the preceding claims, comprising a secondary flat tube having a first side surface and a second side surface and extending from a first end to a second end, and wherein the secondary flat tube comprises a first part extending along a first secondary axis and a second part extending along a second secondary axis, the secondary flat tube further comprising a first bending between the first part and the second part such that the first side surface of the first part faces the first side surface of the second part and the angle between the first secondary axis and the second secondary axis is in the range from about 20° to about 160°.
26. Method for manufacturing a cooling device comprising a flat tube having a first side surface and a second side surface and extending from a first end to a second end, wherein the method comprises
- bending the flat tube such that the first side surface of a first part of the flat tube faces the first side surface of a second part of the flat tube and the angle between the first part and the second part is in the range from about 20° to about 160°.
PCT/DK2009/000263 2008-12-23 2009-12-22 Cooling device with bended flat tube and related manufacturing method WO2010072221A2 (en)

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JP2017534826A (en) * 2014-09-15 2017-11-24 アアヴィッド・サーマロイ・エルエルシー Thermosiphon with a bent tube
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