EP1710525A1 - Flachrohr für wärmetauscher, das flachrohr verwendender wärmetauscher und verfahren zum formen des flachrohrs für den wärmetauscher - Google Patents

Flachrohr für wärmetauscher, das flachrohr verwendender wärmetauscher und verfahren zum formen des flachrohrs für den wärmetauscher Download PDF

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Publication number
EP1710525A1
EP1710525A1 EP04821200A EP04821200A EP1710525A1 EP 1710525 A1 EP1710525 A1 EP 1710525A1 EP 04821200 A EP04821200 A EP 04821200A EP 04821200 A EP04821200 A EP 04821200A EP 1710525 A1 EP1710525 A1 EP 1710525A1
Authority
EP
European Patent Office
Prior art keywords
open end
flat tube
flat
tube
heat exchanger
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP04821200A
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English (en)
French (fr)
Other versions
EP1710525A4 (de
Inventor
A. Valeo Thermal Systems Japan Corp. TAKANO
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valeo Thermal Systems Japan Corp
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Valeo Thermal Systems Japan Corp
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Filing date
Publication date
Application filed by Valeo Thermal Systems Japan Corp filed Critical Valeo Thermal Systems Japan Corp
Publication of EP1710525A1 publication Critical patent/EP1710525A1/de
Publication of EP1710525A4 publication Critical patent/EP1710525A4/de
Withdrawn legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/02—Tubular elements of cross-section which is non-circular
    • F28F1/025—Tubular elements of cross-section which is non-circular with variable shape, e.g. with modified tube ends, with different geometrical features
    • 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
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/053—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight
    • F28D1/0535—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight the conduits having a non-circular cross-section
    • F28D1/05366—Assemblies of conduits connected to common headers, e.g. core type radiators
    • F28D1/05391—Assemblies of conduits connected to common headers, e.g. core type radiators with multiple rows of conduits or with multi-channel conduits combined with a particular flow pattern, e.g. multi-row multi-stage radiators

Definitions

  • the present invention relates to a flat tube to be used in a heat exchanger, which has two open ends, is formed in the shape of a flat tube with a passage formed therein and has the opened ends thereof inserted at tube insertion holes formed at header pipes. More specifically, it relates to a flat tube for a heat exchanger, having twisted portions near the open end portions thereof.
  • the present invention also relates to a heat exchanger that includes the flat tube described above and a method for forming the flat tube for a heat exchanger.
  • a heat exchanger with a high pressure-withstanding specifications which includes header pipes and flat tubes inserted and bonded at the header pipes, needs to assure the required pressure-withstanding strength by minimizing the diameters of the header pipes.
  • This requirement is addressed in a structure in which the portions of flat tubes to be inserted and bonded at the header pipes near the open end portions are twisted by approximately 90° so as to align the open end portions along the longer side of the header pipes, tube insertion holes ranging along the axial direction are formed at the circumferential surfaces of the header pipes and the open end portions of the flat tubes are inserted and bonded at the tube insertion holes (patent reference literature 1).
  • the openings at the flat tubes may be offset relative to the central line of the flat tubes extending along the lengthwise direction (see patent reference literature 2).
  • the flat tubes will have to be disposed over a significant interval from each other in order to allow their open ends to be inserted at the tube insertion holes at the header pipes.
  • the dimensions of the heat exchanger unit at such a heat exchanger are bound to be significant. If, on the other hand, the open end portions are offset to an excessive extent, the adjacent header pipes will need to be disposed over a significant distance from each other, resulting in an increase in the external dimensions.
  • the flat tubes cannot be provided as universal parts and the manufacturing process and the assembly process are bound to become complex and laborious. Furthermore, the flat tube manufacturing process includes a step for twisting and offsetting the open end portions and, for this reason, it is not ideal for mass production.
  • primary objects of the present invention are to provide a flat tube to be used in a heat exchanger, which allows the external dimensions of the heat exchanger to be minimized and can be provided as a universal part, to provide a heat exchanger that includes such a flat tube and a method for forming a flat tube that is optimal for mass production.
  • the present invention achieves the objects described above by providing the flat tube for a heat exchanger, formed in the shape of a flat tube with two open ends and a fluid passage formed therein, having twisted portions near the open end portions and having the open end portions inserted at tube insertion holes extending along central lines of header pipes, which is characterized in that the open end portions of the flat tube are each offset relative to a central line of the flat tube extending along the lengthwise direction and that the extent of the offset is set so that the open end portion is aligned with a side edge of the flat tube.
  • a sufficient distance between the open end portions of two flat tubes disposed side-by-side can be assured by turning the offset open ends outward and, at the same time, since the open ends are not set too far apart, the header pipes can be positioned close to each other.
  • the open end portions can be set close to each other by turning the offset open ends inward so as to minimize the diameter of the common header pipe.
  • the measurement of the twisted portions taken along the length of the flat tube should be set within the range equal to or greater than the width of the flat tube and equal to or less than 1.3 times the width of the flat tube, so as to sustain the required level of heat exchanging performance while assuring sufficient durability.
  • the heat exchanger according to the present invention includes header pipes, flat tubes, each formed in the shape of a flat tube with two open ends and a fluid passage formed therein and having the open end portions thereof inserted at tube insertion holes formed at the header pipes, and fins disposed between the flat tubes set next to each other.
  • the heat exchanger is characterized in that the tube insertion holes are formed as elongated holes ranging along the central lines of the header pipes, that portions of the flat tubes near the open end portions are twisted so as to match the shape of the elongated holes and the open end portions are offset relative to the central line of the flat tubes extending along the lengthwise direction and that the extent to which the open end portions are offset is set so as to align the open end portions with the side edges of the flat tubes.
  • the heat exchanger adopting this structure can be provided as a compact unit.
  • the header pipes include a first header pipe, a relay header pipe disposed so as to face opposite the first header pipe and a second header pipe disposed next to the first header pipe so as to face opposite the relay header pipe.
  • the flat tubes include a plurality of first flat tubes disposed so as to communicate between the first header pipe and the relay header pipe and a plurality of second flat tubes disposed so as to communicate between the relay header pipe and the second header pipe.
  • the open end portions of the first flat tubes inserted at the tube insertion holes at the first header pipe are offset toward the side edges of the first flat tubes further away from the second flat tubes, whereas the open end portions of the first flat tubes inserted at the tube insertion holes at the relay header pipe are offset toward the side edges of the flat tubes closer to the second flat tubes.
  • the open end portions of the second flat tubes inserted at the tube insertion holes at the second header pipe are offset toward the side edges of the flat tubes further away from the first flat tubes, whereas the open end portions of the second flat tubes inserted at the tube insertion holes at the relay header pipe are offset toward the side edges of the second flat tubes closer to the first flat tubes.
  • Such a heat exchanger with a twin flow of coolant flowing in opposite directions can be provided as a compact unit.
  • the heat exchanger flat tube manufacturing method relates to a method for forming a flat tube used in a heat exchanger, formed in the shape of a flat tube with two open ends and a fluid passage formed therein and having twisted portions near the open end portions thereof, the open end portions inserted at tube insertion holes ranging along the central lines of header pipes and the open end portions offset relative to a central line of the flat tube extending along the lengthwise direction, characterized in that each open end of the flat tube and a portion of the flat tube away from the open end by a predetermined distance are clamped with chuck members and that the chuck member clamping the open end is made to slide along the offset direction while it rotates around an axis extending along the length of the flat tube.
  • each open end of the flat tube and a portion of the flat tube away from the open end by a predetermined distance may be clamped with chuck members, the chuck member clamping the open end may be made to slide along the clamping direction and then the chuck member may be made to rotate around an axis set along the central line of the flat tube extending along the lengthwise direction.
  • a portion of the flat tube away from an open end of the flat tube by a predetermined distance may be clamped with a chuck member, then the open end may be clamped with another chuck member while the open end is made to become displaced along the clamping direction and subsequently, the chuck member clamping the open end may be made to rotate around an axis set along the central line of the flat tube extending along the lengthwise direction.
  • each open end of the flat tube and a portion of the flat tube away from the open end by a predetermined distance may be clamped with chuck members, the chuck member clamping the open end may be made to rotate around an axis extending along the length of the flat tube and then the chuck member may be made to slide along the offset direction.
  • the chuck member clamping the open end of the flat tube may be positioned close to the chuck member clamping the portion away from the open end by the predetermined distance while the chuck member clamping the open end rotates around the axis extending along the length of the flat tube so as to form a small twisted portion.
  • a predetermined range of clearance may be formed between the chuck member clamping the portion away from the open end of the flat tube by the predetermined distance and the flat tube.
  • a pair of rollers may be used to clamp the portion of the flat tube away from the open end by the predetermined distance.
  • the corners of the chuck member clamping the open end of the flat tube and the chuck member clamping the portion of the flat tube away from the open end by the predetermined distance, used to clamp the open end and the portion away from the open end by the predetermined distance and set on sides opposite from each other, may be beveled so as to prevent the chuck members from biting into the flat tube.
  • bevel radius R be set so that R ⁇ 0.5t is true with t representing the plate thickness of the flat tube.
  • the open end portions of the flat tube are each offset relative to the central line of the flat tube extending along the length thereof by a specific extent so as to align the open end portions at a side edge of the flat tube.
  • the wasted area where fins cannot be mounted is reduced while assuring the required level of durability in the twisted portions.
  • each open end and a portion of the flat tube away from the open end by the predetermined distance are each clamped via a chuck member during this process.
  • the open end of the flat tube and the portion of the flat tube away from the open end by the predetermined distance are clamped with the chuck members and the chuck member clamping the open end is made to slide along the offset direction while it rotates around the axis extending along the length of the flat tube, the range of material deformation is minimized.
  • the chuck member clamping the open end is made to slide along the offset direction and then the chuck member clamping the open end is made to rotate around an axis set along the central line of the flat tube extending along the length thereof, the portion of the flat tube away from the open end by the predetermined distance may be first clamped with the corresponding chuck member, the open end may then be clamped with the other chuck member while the open end is displaced along the offset direction and subsequently, the chuck member clamping the open end may be made to rotate around the axis set along the central line of the flat tube extending along the length thereof.
  • the open end of the flat tube and the portion of the flat tube away from the open end by the predetermined distance may be clamped with chuck members, the chuck member clamping the open end may he made to rotate around the axis set along the length of the flat tube and then the chuck member clamping the open end may be made to slide along the offset direction.
  • the chuck member movement is simplified and, thus, the mechanism is also simplified.
  • the chuck member clamping the open end of the flat tube may be positioned close to the chuck member clamping the portion away from the open end by the predetermined distance as the chuck member clamping the open end rotates around the axis set along the length of the flat tube.
  • the extent to which the material is allowed to stretch is minimized and consequently, the material does not rupture readily.
  • the twisted area, which is not used in the heat exchange is reduced, the area over which fins are mounted in the heat exchanger is increased, thereby assuring a greater heat exchanging area.
  • any stretching of the twisted portion can be absorbed with the whole flat tube.
  • the chuck members By beveling the corners of the clamping portion of the chuck member used to clamp the open end of the flat tube and the chuck member used to clamp the portion away from the open end by the predetermined distance, which are located on sides opposite from each other, the chuck members are prevented from biting into the flat tube, and thus, the twisted portion does not become damaged.
  • a heat exchanger 1 in FIGS. 1 and 2 is used in a refrigerating cycle engaged in operation by using a high-pressure coolant, such as a CO2 coolant, sealed therein.
  • the heat exchanger 1 includes first and second header pipes 2 and 3 disposed next to each other and a relay header pipe 4 disposed so as to face opposite the first and second header pipes 2 and 3.
  • the first header pipe 2 and the relay header pipe 4 are made to communicate with each other via a plurality of first flat tubes 5, whereas the second header pipe 3 and the relay header pipe 4 are made to communicate with each other via a plurality of second flat tubes 6.
  • the first and second header pipes 2 and 3 each assume a tubular shape achieved by fitting a tube mounting plate 2b (3b) at a slit 4 (5) formed at the side surface of a pipe forming member 2a (3a) with a circular section.
  • the two ends of each header pipe along the lengthwise direction are closed off by lids 2c (3c) inserted through notches 6 at the pipe forming member 2a (3a).
  • a plurality of tube insertion holes 7 (8) formed as elongated holes ranging along the lengthwise direction are present in a single straight row, as shown in FIG. 1(c).
  • the relay header pipe 4 is formed by fitting a tube mounting plate 4b at a slit 9 formed at the side surface of a pipe forming member 4a with a circular section, with the two ends thereof along the lengthwise direction closed off with lids 4c inserted through notches 10 formed at the pipe forming member 4a.
  • the pipe forming member 4a has a diameter greater than the diameters of the first and second header pipes 2 and 3, and the lateral width of the tube mounting plate 4b, too, is set greater than the lateral widths of the tube mounting plates 2b and 3b at the first and second header pipes 2 and 3.
  • a plurality of tube insertion holes 12 which are elongated holes ranging along the lengthwise direction, are formed at the tube mounting plate 4b in two straight rows.
  • the first flat tubes 5 and the second flat tubes 6 each have two open ends and a fluid passage formed therein.
  • the portions of each flat tube near its open ends 13 and 14 present on the two sides along the lengthwise direction are twisted by approximately 90° around an axis extending alone the length of the flat tube.
  • the open end portions 13 and 14 are each offset relative to the central line of the flat tube extending along the length thereof to a specific extent so that the open end portion is aligned at a side edge of the flat tube 5 (6).
  • One of the open end portions along the longer side of the flat tube 5 (6) is made to offset to a side opposite from the side to which the other open end portion is offset, so as to achieve point symmetry relative to the center of the flat tube.
  • One of the open end portions, i.e., the open end 13, at each first flat tube 5 is inserted at a tube insertion hole 7 at the first header pipe 2 and the open end portion 13 is also offset toward the side edge further away from the corresponding second flat tube 6.
  • the other open end 14 of the first flat tube 5 is inserted at a tube insertion hole 12 at the relay header pipe 4 and the open end portion 14 is also offset toward the side edge closer to the corresponding second flat tube 6.
  • one of the open end portions, i.e., the open end 14, at each second flat tube 5 is inserted at a tube insertion hole 8 at the second header pipe 3 and the open end portion 14 is also offset toward the side edge further away from the corresponding first flat tube 5.
  • the other open end 13 of the first flat tube 5 is inserted at a tube insertion hole 12 at the relay header pipe 4 and the open end portion 13 is also offset toward the side edge closer to the corresponding second flat tube 6.
  • corrugated fins 17 are disposed.
  • side plates 18 each having a U-shaped section are disposed via fins 17 over the flat areas. It is to be noted that the fins disposed between the first flat tubes 5 and the fins disposed between the second flat tubes 6 may be formed separately or may be formed as integrated parts.
  • a fluid having flowed into the first header pipe 2 is distributed into the first flat tubes 5, exchanges heat with the air passing through the fins 17 and is then collected into the relay header pipe 4. It then makes a U-turn inside the relay header pipe 4, is distributed into the second flat tubes 6, exchanges heat with the air passing through the fins 17 again, is collected into the second header pipe and flows out through the second header pipe 3.
  • twin flows of coolant along opposite directions are achieved through the first flat tubes 5 and the second flat tubes 6.
  • the air is made to flow along the direction opposite from the direction of the coolant flow through the flat tubes.
  • the open end portions 13 and 14 of the flat tube 5 (6) are offset so as to align with the side edges of the flat tube 5 (6) (the open end portion near the first and second header pipes 2 and 3 is offset so as to align with the outer side edge and the open end portion near the relay header pipe 4 is offset so as to align with the inner side edge).
  • the open end 13 and 14 of the flat tubes 5 and 6 on the side where the first and second header pipes 2 and 3 are present can be inserted at the tube insertion holes without having to set the first and second header pipes 2 and 3 over a significant distance from each other.
  • the first and second header pipes can be disposed right next to each other.
  • first and second flat tubes 5 and 6 on the side where the relay header pipe 4 is present can be set close enough to each other, to allow the diameter of the relay header pipe to assume a smaller value.
  • the heat exchanger with twin coolant flows in opposite directions can be provided as a compact unit.
  • identical universal flat tubes can be used as the first and second flat tubes. Namely, universal parts can be used as the first and second flat tubes and this simplifies the manufacturing process and the assembly process.
  • the flat tubes according to the present invention facilitate mass production.
  • Any of the following forming methods may be adopted to mass produce flat tubes described above having portions thereof near the open end portions twisted and the open end portions thereof offset.
  • each open end (13 or 14) of a flat tube (5 or 6) achieving predetermined dimensions and a portion 20 away from the open end by a predetermined distance are respectively clamped by a first chuck member 21 and a second chuck number 22, as shown in FIG. 4(a). Then, as shown in FIG. 4(b), the first chuck member 21 clamping the open end (13 or 14) is made to slide along the offset direction while the first chuck member rotates around an axis set along the length of the flat tube 5 (6) so as to twist the area near the open end (13 or 14) by approximately 90°, as shown in FIG.
  • twisting step and the offsetting step are executed concurrently and the speeds with which the individual steps are executed are controlled so that the twisting motion and the offsetting motion start simultaneously and end simultaneously.
  • the deformation attributable to the twisting motion of the portion near the open end (13 or 14) of the flat tube (5 or 6) and the deformation attributable to the offsetting motion occur at the same time, allowing the overall deformation of the material constituting the twisted portion (15 or 16) to occur over the minimum possible range. In other words, no redundant deformation occurs.
  • the flat tube (5 or 6) achieving predetermined dimensions is clamped at two positions, i.e., at an open end (13 or 14) and a portion 20 away from the open end by a predetermined distance, via a first chuck member 21 and a second chuck member 22 respectively, as shown in FIG. 5(a).
  • the first chuck member 21 clamping the open end (13 or 14) is made to slide along the clamping direction and then the first chuck member is made to rotate around an axis set along the central line of the flat tube (5 or 6) extending along the length thereof, as shown in FIG. 5(c).
  • the portion near the open end (13 or 14) becomes twisted by approximately 90° and the open end portion (13 or 14) becomes aligned at the side edge of the flat tube (5 or 6), as shown in FIG. 5(d).
  • the first chuck member is made to rotate around the axis set along the central line of the flat tube (5 or 6) extending along the length thereof after sliding the first chuck member 21 and, as a result, the movement of the chuck member 21 is simplified, which, in turn, allows the mechanism to be simplified.
  • the open end (13 or 14) is displaced by the clamping force imparted from the first chuck member 21, and then, the first chuck member 21 is made to rotate around the axis set along the central line of the flat tube (5 or 6) extending along the length thereof to offset the open end portion.
  • the movements of the chuck members 21 and 22 are further simplified, which, in turn, allows the mechanism to become further simplified.
  • the flat tube (5 or 6) achieving predetermined dimensions is clamped at two positions, i.e., at an open end (13 or 14) and the portion 20 away from the open end by the predetermined distance via the first chuck member 21 and the second chuck member 22 respectively, as shown in FIG. 7(a).
  • the first chuck member 21 clamping the open end (13 or 14) is made to rotate around an axis set along the central line of the flat tube (5 or 6) extending along the length thereof.
  • the first chuck member 21 is made to slide along the offset direction, as shown in FIG. 7(c) so as to twist the portion of the flat tube near the open end portion (13 or 14) by approximately 90° and align the open end (13 or 14) at a side edge of the flat tube (5 or 6), as shown in FIG. 7(d).
  • the first chuck member 21 is first rotated around the axis set along the central line of the flat tube (5 or 6) extending along the length thereof and then is made to slide.
  • the movements of the chuck members 21 and 22 are simplified, which, in turn, allows the structure of the mechanism to be simplified.
  • the flat tube (5 or 6) achieving predetermined dimensions is clamped at two positions, i.e., at an open end (13 or 14) and a portion 20 thereof away from the open end by a predetermined distance, via a first chuck member 21 and a second chuck member 22 respectively, as shown in FIG. 8(a). Then, as shown in FIG. 8(b), the first chuck member 21 clamping the open end (13 or 14) is made to slide along the offset direction while it rotates around an axis set along the length of the flat tube (5 or 6) and, at the same time, the first chuck member 21 is positioned in close proximity to the second chuck member 22.
  • the portion near the open end (13 or 14) becomes twisted by approximately 90° and the open end portion (13 or 14) becomes aligned at a side edge of the flat tube (5 or 6), as shown in FIG. 8(c).
  • the twisting step and the offsetting step are executed concurrently, and the speeds with which the individual steps are executed are controlled so that the twisting motion and the offsetting motion start and end simultaneously.
  • the forming method described above minimizes the extent to which the material stretches, which, in turn, reduces the occurrence of material rupture.
  • the dimensions of the twisted portions 15 and 16 are minimized. This, in turn, assures a greater area in the heat exchanger 1 over which the fins 17 are mounted, thereby increasing the heat exchanging area.
  • first chuck member 21 may be positioned in close proximity to the second chuck member 22 while twisting the open end 13 (14) around the axis set along the length of the flat tube 5 (6) in any of the forming methods described above.
  • a predetermined range of clearance 30 may be set between the second chuck member 22 and the flat two 5 (6), as shown in FIG. 9 or a pair of rollers 31, instead of the second chuck member 22, may be used to clamp the portion 20, as shown in FIG. 10.
  • the portion 20 away from the open end 13 (14) by the predetermined distance is not directly clamped by the chuck, which, in turn, allows any stretching of the flat tube (5 or 6) resulting from the twisting step or the offsetting step to be absorbed over the entire flat tube.
  • any reduction in the wall thickness due to stretching of the material or rupture over the area that would otherwise be clamped by the chuck member can be prevented.
  • the radius R of the beveled areas be set so that R ⁇ 0.5t with t representing the plate thickness of the flat tube. While the chuck members do not bite into the flat tube even if the radius of the beveled areas is small, as long as the flat tube is twisted over a significant width range, the chuck members 21 and 22 are bound to bite into the flat tube to rupture or crack the flat tube over the clamped areas when the twist width (the measurement of the twisted portions taken along the length of the flat tube) L (see FIG. 3) is small, unless the radius of the beveled areas is increased. Accordingly, while a limit point exists, at which the twist width L needs to be increased as the bevel radius becomes smaller, as shown in FIG. 12, rupture and cracking over the twisted portions 15 and 16 can be prevented by setting the beveling radius R within the range described above.
  • twist width (the measurement of the twisted portions taken along the length of the flat tube) L (see FIG. 3) of the twisted portions 15 and 16 near the open end portions of the flat tube 5 (6) be set within a range of equal to or greater than the tube width W and equal to or less than 1.3 times the tube width W (1.0 W ⁇ L ⁇ 1.3 W).
  • L becomes smaller than 1.0 W, the material stretches to a greater extent, which readily causes rupture and cracking of bent areas and increases the risk of fluid leak within the tube (see FIG. 13).
  • L must be set equal to or greater than the tube width W in order to eliminate the risk of leak. If, on the other hand, the twist width becomes excessively large, the area where fins cannot be mounted increases.
  • L should be set within the range described above by taking into consideration the minimum requirement for heat exchanging performance, so as to ensure that the heat exchanging performance is sufficient while eliminating the risk of a leak.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
EP04821200A 2004-01-27 2004-12-02 Flachrohr für wärmetauscher, das flachrohr verwendender wärmetauscher und verfahren zum formen des flachrohrs für den wärmetauscher Withdrawn EP1710525A4 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2004019011A JP2005214459A (ja) 2004-01-27 2004-01-27 熱交換器用偏平チューブ、これを用いた熱交換器、及び熱交換器用偏平チューブの成形方法
PCT/JP2004/017913 WO2005071340A1 (ja) 2004-01-27 2004-12-02 熱交換器用偏平チューブ、これを用いた熱交換器、及び熱交換器用偏平チューブの成形方法

Publications (2)

Publication Number Publication Date
EP1710525A1 true EP1710525A1 (de) 2006-10-11
EP1710525A4 EP1710525A4 (de) 2007-11-21

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EP04821200A Withdrawn EP1710525A4 (de) 2004-01-27 2004-12-02 Flachrohr für wärmetauscher, das flachrohr verwendender wärmetauscher und verfahren zum formen des flachrohrs für den wärmetauscher

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EP (1) EP1710525A4 (de)
JP (1) JP2005214459A (de)
WO (1) WO2005071340A1 (de)

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GB2457935A (en) * 2008-02-29 2009-09-02 Pitacs Ltd Heating appliance having at least one tubular heat exchange member of non-circular cross-section that is twisted about its longitudinal axis
CN102062549A (zh) * 2011-02-15 2011-05-18 金龙精密铜管集团股份有限公司 扁管热交换器
CN107504836A (zh) * 2017-09-20 2017-12-22 杭州三花家电热管理***有限公司 换热器、换热***及室内采暖***
DE102022200916A1 (de) 2021-02-11 2022-08-11 Mahle International Gmbh Wärmeübertrager

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FR2890730B1 (fr) * 2005-09-13 2007-10-19 Valeo Systemes Thermiques Element de circuit a tubes plats, et echangeur de chaleur muni de tels elements
FR2899959B1 (fr) * 2006-04-14 2008-08-08 Valeo Systemes Thermiques Echangeur de chaleur ameliore et module d'echange de chaleur comportant un tel echangeur
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CN215063873U (zh) * 2021-02-07 2021-12-07 浙江盾安人工环境股份有限公司 换热器及空调设备
CN114909831B (zh) * 2021-02-08 2024-06-14 广东美的暖通设备有限公司 换热器、电控盒及空调***

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GB2457935A (en) * 2008-02-29 2009-09-02 Pitacs Ltd Heating appliance having at least one tubular heat exchange member of non-circular cross-section that is twisted about its longitudinal axis
GB2457935B (en) * 2008-02-29 2010-08-04 Pitacs Ltd A heating appliance
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CN102062549B (zh) * 2011-02-15 2012-08-29 金龙精密铜管集团股份有限公司 扁管热交换器
CN107504836A (zh) * 2017-09-20 2017-12-22 杭州三花家电热管理***有限公司 换热器、换热***及室内采暖***
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