WO2005047798A1 - Tube a orifices multiples destine a un echangeur de chaleur et procede de dilatation de tubes correspondant - Google Patents

Tube a orifices multiples destine a un echangeur de chaleur et procede de dilatation de tubes correspondant Download PDF

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Publication number
WO2005047798A1
WO2005047798A1 PCT/JP2004/007935 JP2004007935W WO2005047798A1 WO 2005047798 A1 WO2005047798 A1 WO 2005047798A1 JP 2004007935 W JP2004007935 W JP 2004007935W WO 2005047798 A1 WO2005047798 A1 WO 2005047798A1
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WO
WIPO (PCT)
Prior art keywords
tube
heat exchanger
axis direction
hole tube
cross
Prior art date
Application number
PCT/JP2004/007935
Other languages
English (en)
Japanese (ja)
Inventor
Kihachiro Koga
Original Assignee
Hidaka Seiki Kabushiki Kaisha
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 Hidaka Seiki Kabushiki Kaisha filed Critical Hidaka Seiki Kabushiki Kaisha
Publication of WO2005047798A1 publication Critical patent/WO2005047798A1/fr

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Classifications

    • 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
    • F28F1/022—Tubular elements of cross-section which is non-circular with multiple channels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/151—Making tubes with multiple passages
    • 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
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/24—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely
    • F28F1/32—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely the means having portions engaging further tubular elements
    • F28F1/325—Fins with openings

Definitions

  • the present invention relates to a multi-hole tube for a heat exchanger and a method for expanding the multi-hole tube for a heat exchanger.
  • the present invention relates to a multi-hole tube for a heat exchanger in which a plurality of flow paths are formed inside a tube for a heat exchanger used in a heat exchanger, and a method for expanding such a multi-hole tube for a heat exchanger. About.
  • Heat exchangers such as coolers for home use and automobiles are composed of a plurality of heat exchanger fins formed of a thin plate of aluminum or the like, and a metal heat exchanger tube. Refrigerant flows through the heat exchanger tube, and heat is exchanged through the fins.
  • the multi-hole tube 10 for a heat exchanger has a flat cross section. If the flat shape is inserted into the heat exchanger fins (not shown) so as to be parallel to the air flow direction A by providing the flat shape, the multi-well tube 10 for the heat exchanger is received. This is because air resistance can be reduced and heat exchange efficiency can be increased. Generally, not only the multi-hole tube but also the heat exchanger tube is inserted into the through hole with the collar of the fin, and then the heat exchanger tube and the fin are firmly joined and integrated by heat exchange. It is common practice to expand dexterous tubes.
  • the tube can be easily expanded using an expansion burette (for example, see Patent Document 2).
  • an expansion burette for example, see Patent Document 2.
  • Patent Document 1 JP-A-8-73973
  • Patent Document 2 JP-A-7-124670
  • the multi-hole tube for a heat exchanger having a flat cross section as described above, there is a possibility that dust may accumulate on a flat portion or water droplets may adhere. In such a case, there is a problem that the heat exchange efficiency is deteriorated because the flow of air is hindered.
  • the multi-hole tube for a heat exchanger is integrated with the fins, it can be expanded in the short axis direction of the flat tube, but is difficult to expand in the long axis direction. For this reason, there is a problem in that the heat exchange efficiency may be poor at the end of the multi-hole tube for a heat exchanger in the long axis direction because the end cannot be reliably contacted with the fin.
  • the present inventor has studied to solve the above problems, and as a result, it has been found that the multihole tubes for a heat exchanger are not flat, and the shape of a plurality of internal flow paths is devised to solve the above problems.
  • the present inventor has found out what can be done and arrived at the present invention.
  • an object of the present invention is to provide a multi-hole tube for a heat exchanger that can prevent dust and water droplets from adhering and preventing a decrease in heat exchange efficiency, and a method for expanding such a multi-hole tube for a heat exchanger. It is in.
  • the external shape of the cross section of the whole tube is formed in the opal shape.
  • the meaning of the opal in the present specification is a shape including an oval and an ellipse, and means a shape in which at least a major axis and a minor axis are present and no plane portion is present. Also, the odd number of the plurality of flow paths are formed, and the flow path having the largest cross-sectional area among the odd number of flow paths is provided at the center of the tube cross section in the major axis direction and the minor axis direction. It may be a sign.
  • a method for expanding a multi-hole tube for a heat exchanger according to claim 2 wherein the tube is provided at the center in the major axis direction and the minor axis direction of the tube cross section. It is characterized in that the entire tube is expanded by inserting the expansion burette into only the flow path in which the tube is located, and expanding the flow path provided at the center in the long axis direction and the short axis direction of the tube cross section. .
  • the multi-hole tube for heat exchangers of this invention since the cross section was made into the opal shape and the flat part was eliminated, it can be set as the heat exchanger with good heat exchange efficiency which is hard for dust and water droplets to adhere.
  • a heat exchanger can be provided at low cost.
  • it is possible to reliably expand the pipe in the long axis direction it is possible to surely make contact with the fins, thereby providing a heat exchanger having high heat exchange efficiency.
  • FIG. 1 is a perspective view showing the overall configuration of a multi-hole tube for a heat exchanger.
  • FIG. 2 is a cross-sectional view of the multi-hole tube for a heat exchanger according to the first embodiment.
  • FIG. 3 is a cross-sectional view of a multi-hole tube for a heat exchanger according to a second embodiment.
  • FIG. 4 is a sectional view of a multi-hole tube for a heat exchanger according to a third embodiment.
  • FIG. 5 is a perspective view showing an overall configuration of a multi-hole tube for a heat exchanger according to a fourth embodiment.
  • FIG. 6 is a sectional view of a multi-hole tube for a heat exchanger according to a fourth embodiment.
  • FIG. 7 is an explanatory diagram showing a structure of a heat exchanger.
  • FIG. 8 is an explanatory view showing a structure of a fin.
  • FIG. 9 is an explanatory view showing a state where a multi-hole tube for a heat exchanger is passed through the fins of FIG. 8.
  • FIG. 10 is an explanatory view showing a method for expanding the multi-hole tube for a heat exchanger shown in Example 1.
  • FIG. 11 is an explanatory view showing a state of expansion of the multi-hole tube for a heat exchanger shown in Example 1.
  • FIG. 12 is an explanatory view showing a method for expanding the multi-hole tube for a heat exchanger shown in Example 4.
  • FIG. 13 is an explanatory view showing a state of expansion of the multi-hole tube for a heat exchanger shown in Example 4.
  • FIG. 14 is an explanatory view illustrating the structure of a conventional multi-hole tube for a heat exchanger.
  • a plurality of flow paths were formed in a multi-hole tube for a heat exchanger having an overall oval cross section. At this time, the plurality of flow paths were arranged in series along the longitudinal direction of the tube cross section.
  • the flow path located at the center in the major axis direction and the minor axis direction of the tube cross section has a shape in which four sides of a rectangle that is long in the minor axis direction of the cross section are formed in an arc shape.
  • each side of the flow path has an arc shape in which two opposite sides in the long axis direction are convex toward the outside of the flow path, and the two opposite sides in the short axis direction are the flow path. It is formed so as to have an arc shape that is convex toward the inside of the circle.
  • Example 1 Hereinafter, examples of the multi-hole tube for a heat exchanger will be described.
  • FIG. 1 shows the overall configuration of the multi-hole tube for a heat exchanger.
  • a multi-hole tube for a heat exchanger (hereinafter simply referred to as a multi-hole tube) 30 is inserted into a fin for a heat exchanger (see FIG. 7; hereinafter, simply referred to as a fin) to allow a refrigerant to flow therethrough. Things.
  • the multi-hole tube 30 has therein a plurality of flow paths 31 partitioned by a partition wall 32, and thus has a characteristic that the heat exchange efficiency can be increased by increasing the contact area of the refrigerant. are doing.
  • the multi-hole tube 30 is made of aluminum or copper, and is formed by extrusion. Therefore, the outer peripheral wall 33 of the multi-hole tube 30 and the respective partition walls 32 for forming the internal flow path are formed integrally. It is also preferable to improve the mechanical properties of the multi-hole tube formed by extrusion processing by heat treatment (so-called annealing). Specifically, in the case of a multi-hole tube made of Anore Minim, by heating to 400 ° C ⁇ 50 ° C after extrusion, the tube can be expanded well in the longitudinal direction of the tube cross section.
  • the method of manufacturing the multi-hole tube 30 is well known in the art, and thus will not be described in detail here.
  • FIG. 2 shows a cross section of the multi-hole tube 30 of the present embodiment.
  • the entire cross section of the multi-hole tube 30 is formed in an oval shape.
  • the ratio of the length in the major axis direction X to the minor axis direction Y is about 4: 1.
  • the flow path 31a having the largest diameter is disposed at the center of the tube cross section in the long axis direction X, and the center of the flow path 31a is aligned with the center of the tube cross section in the short axis direction Y. I do.
  • the channels 31b having the next largest diameter are arranged on both sides of the channel 31a in the long axis direction. Further, a flow path 31c having the smallest diameter is arranged on the end side of the flow path 31b in the long axis direction.
  • the five flow paths 31a to 31c having an oval cross section are arranged in series in the longitudinal direction of the entire tube.
  • the partition walls 32 are arranged in contact with each other in the longitudinal direction X of the entire tube.
  • Each of these partition walls 32 is arranged in the short axis direction Y of the entire tube. It is arranged in contact with the inner wall surface 35 of the tube.
  • the flow passages formed inside the multi-hole tube 30 include not only flow passages 31a-31c having an oval cross section or a circular cross section, but also the circular holes existing outside thereof.
  • the non-bar-shaped part 3 Id is also a flow path.
  • FIG. 3 shows another embodiment of the multi-hole tube.
  • the multi-hole tube 40 is formed in an oval shape as a whole, and has a shape in which the ratio of the length in the major axis direction X to the minor axis direction Y is about 3: 1. Therefore, the shape is such that the thickness is increased in the short axis direction Y as compared with the multi-hole tube 30 shown in the first embodiment.
  • five oval-shaped flow paths 41 are formed inside an opal-shaped multi-hole tube 40 in the overall section.
  • the flow path 41a having the largest diameter is disposed at the center of the entire tube in the long axis direction X, and the center of the flow path 41a coincides with the center of the short axis direction Y.
  • Channels 41b having the next largest diameter are arranged on both sides of the channel 41a in the long axis direction.
  • a flow path 41c having the smallest diameter is disposed on the end side of the flow path 41b in the long axis direction.
  • the five oval-shaped flow paths 41a to 41c are arranged in series in the longitudinal direction of the entire tube.
  • the partition walls 42 are arranged in contact with each other in the longitudinal direction X of the entire tube.
  • Each of these partition walls 42 is disposed in contact with the inner wall surface 45 of the tube in the short axis direction Y of the entire tube.
  • the flow path formed inside the multi-well tube 40 is not only a flow path 41a-41c having an oval cross-section but a circular cross-section.
  • the part 41d is also a flow path.
  • FIG. 4 shows another embodiment of the multi-hole tube.
  • the multi-well tube 50 is formed in an oval shape as a whole, but has a shape in which the ratio of the length in the major axis direction X to the minor axis direction Y is about 3: 1. Therefore, the overall shape is the same as that of the multi-well tube 40 shown in the second embodiment.
  • three channels 51 having an opal-shaped cross section are formed inside the multi-hole tube 50 having an opal-shaped cross section.
  • the largest diameter channel 51a is arranged at the center of the entire tube in the long axis direction X, and the center of the channel 51a coincides with the center in the short axis direction Y .
  • the other flow paths 51b are respectively arranged on both sides of the flow path 51a in the long axis direction.
  • the three flow paths 51a and 51b having an oval cross section are arranged in series in the longitudinal direction X of the entire tube.
  • the partition walls 52 are arranged in contact with each other in the longitudinal direction X of the entire tube.
  • These partition walls 52 are arranged in contact with the inner wall surface 55 of the tube in the short axis direction Y of the entire tube.
  • the flow path formed inside the multi-well tube 50 includes a flow path 51a-51b having an oval cross-section and a circular cross-section. Is also a flow path.
  • Examples 1 to 3 an odd number of flow paths having a circular cross section or an opal-shaped cross section were provided, and these were arranged on a straight line (on a line parallel to the major axis direction X of the tube cross section).
  • Each flow path having a circular cross section or an opal cross section is formed by a narrow partition wall having the same shape as the flow path, and the partition walls come into contact with each other in the longitudinal direction X of the tube cross section, and the cross section of the tube cross section is formed.
  • the shape On the Y side in the short axis direction, the shape is such that it comes into contact with the inner wall surface of the tube outer peripheral wall.
  • the multi-hole tube 70 has an opal-shaped cross section as a whole, and has a plurality of flow paths 72a, 72b 'formed therein.
  • the flow path 72a located at the center in the major axis direction X and the minor axis direction Y has a cross section that is not circular or opal-shaped.
  • the cross-sectional shape of the flow path 72a is such that each side of a long rectangle in the short-axis direction Y is This is a shape formed in an arc shape (curve).
  • the cross-sectional shape of the flow path 72a located at the center is composed of four arc-shaped sides p, q, r, and s.
  • two opposing sides p and q in the long axis direction X are convex in the arc, and the protruding direction is outward, and the two opposing sides r and s in the short axis direction Y.
  • two opposing sides r and s in the short axis direction Y are shorter in length than two opposing sides p and q in the long axis direction X.
  • the radii of curvature of these four sides p, q, r, s are almost the same.
  • a plurality of flow paths 72b having a circular cross section are formed on both sides in the long axis direction X of the flow path 72a located at the center of the long axis direction X of the multi-well tube 70.
  • a total of four circular flow paths 72b are formed, two on each side of the flow path 72a (end side in the long axis direction X).
  • the diameters of the flow paths 72b having a circular cross section are all the same.
  • the entire flow paths 72a and 72b are formed in an oval shape, rather than being formed by a thin partition wall.
  • the tube is hollowed out to give a shape as if formed.
  • the part which can be said to be a partition wall has the same thickness as the diameter of each flow path, and the parts other than the flow path 72a located at the center and the circular flow path 72b (except for five places) Is not formed.
  • the method for manufacturing the multi-hole tube 70 can be formed by extrusion or drawing in the same manner as in the above-described embodiments.
  • the heat exchanger 60 is provided so that a plurality of thin fins 36 made of metal are stacked, and the multi-hole tubes 30 are inserted through the stacked fins 36, respectively.
  • the multi-hole tube 30 is joined to and integrated with the fin 36 by being expanded over its entire length.
  • expansion of the multi-hole tube 30 joins the multi-hole tube 30 to the fin 36. It is done at the time.
  • the connection between the fin and the multi-hole tube will be described with reference to FIGS.
  • the multi-hole tube described here is the same as that described in the first embodiment.
  • the fin 36 is a thin metal plate, and has a through hole 38 formed at a predetermined position so that the multi-hole tube 30 can be inserted therein.
  • the periphery of the through hole 38 is provided with a collar 39 formed so as to stand in one direction, and is configured as a through hole 46 with a collar.
  • the multi-hole tube 30 is inserted into such a collared through hole 46 of the fin 36.
  • FIG. 10 is a schematic explanatory view of the method for expanding a multi-hole tube according to the present invention
  • FIG. 11 shows a state of expanding the multi-hole tube at this time.
  • the broken line indicates the state before expansion
  • the solid line indicates the state after expansion.
  • the multi-hole tube 30 described below is the multi-hole tube described in the first embodiment, and has an oval cross section as a whole, and has five oval-shaped flow channels 31 disposed therein. It is. More specifically, a flow path 31a having the largest diameter among the oval cross-sections is disposed at the center of the entire major axis direction X, and the force S directed gradually toward the end in the major axis direction X is gradually increased.
  • the small-diameter flow paths 31b and 31c are arranged, and the partition walls 32 of the oval-shaped flow paths are in contact with each other, and are arranged in a straight line along the long axis direction X.
  • each of the flow paths 31 having the same cross-sectional shape is formed so as to inscribe the inner wall surface 35 of the multi-hole tube 30 in the entire short axis direction Y.
  • the expansion is performed by expanding one of the flow paths 31 having an opal-shaped cross section formed therein with an expansion buret 66.
  • an expansion buret 66 is inserted into a flow path 31a (hereinafter, referred to as a center flow path) arranged at the center in the major axis direction X and the minor axis direction Y, thereby expanding the pipe. It is.
  • the central flow channel 31a is entirely expanded in all directions around 360 degrees. Is pressed (arrow B in FIG. 11).
  • This partition 32bl pushes By being pressed, the center position of the flow path 31b adjacent to the center flow path 31a moves to the end 37 side in the long axis direction X, so that the partition wall 32b2 on the end 37 side of the flow path 31b further ends.
  • the partition wall 32cl forming the flow path 31c adjacent to the part 37 is pressed (arrow C in FIG. 11). Since the partition wall 32c2 on the end 37 side of the flow path 31c is in contact with the vicinity of the end 37, the partition 32c2 expands the vicinity of the end 37 in the longitudinal direction X.
  • the central flow channel 31a is entirely expanded in all directions around 360 degrees, but presses the outer peripheral wall 33 of the entire multi-hole tube 30 at a portion facing the short axis direction ⁇ (arrow D in FIG. 11). Expand the entire tube in the short axis direction Y as well.
  • the expansion burette 66 has a predetermined diameter that is the same as the inner diameter of the central flow path 31a of the multi-hole tube 30 after expansion, and is shown at the tip of the expansion mandrel 68. N, it is mounted by the mounting member.
  • a tube having five opal-shaped flow channels formed was expanded.
  • the number of opal-shaped flow paths is not limited to five, but may be other numbers, but an odd number is preferable.
  • the internal flow path may be a force-recessed circular flow path having a cross section of an opal shape.
  • the multi-hole tube 70 described here has a cross-sectional shape of a flow path 72a located at the center in the long axis direction X and the short axis direction Y among a plurality of flow paths.
  • the sides are formed in an arc shape.
  • two opposing sides p and q in the long axis direction X have outward projections in which the arcs are convex and short axes.
  • Opposite sides r and s in the direction Y are such that the protruding direction in which the arc is convex is inward.
  • the diameter of the expanded burette 66 is the width h (that is, the width It has a larger diameter than the width h) in various directions.
  • the expansion burette 66 is inserted into the flow path 72a, the flow path 72a is expanded in the long axis direction X and the short axis direction Y, and the cross section of the flow path 72a becomes circular (a portion indicated by a broken line E in FIG. 13).
  • the wall around the flow path 72a expands outward, and the entire multi-hole tube 70 is expanded (broken line F in FIG. 13).

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Geometry (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

L'invention concerne un tube à orifices multiples destiné à un échangeur de chaleur capable de prévenir une diminution de l'efficacité d'échange de chaleur, qui risque d'être provoquée par une moindre adhérence de boue et de gouttelettes d'eau, ainsi qu'un procédé de dilatation d'un tube permettant de dilater un tube de façon aisée et sécurisée grâce à l'utilisation d'un petit dispositif dans un tube à orifices multiples pour l'échangeur de chaleur. Le tube à orifices multiples (30) destiné à un échangeur de chaleur dans lequel on a formé une pluralité de passages de flux (31) est caractérisé en ce que le profil du tube en coupe transversale a une forme ovale.
PCT/JP2004/007935 2003-11-12 2004-06-07 Tube a orifices multiples destine a un echangeur de chaleur et procede de dilatation de tubes correspondant WO2005047798A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2003-382853 2003-11-12
JP2003382853 2003-11-12
JP2004-167560 2004-06-04
JP2004167560A JP2005164221A (ja) 2003-11-12 2004-06-04 熱交換器用多穴チューブおよび熱交換器用多穴チューブの拡管方法

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Publication Number Publication Date
WO2005047798A1 true WO2005047798A1 (fr) 2005-05-26

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Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2228153B1 (fr) 2006-12-14 2012-02-08 CTA Technology (Proprietary) Limited Procédé de fabrication d'un tube en cuivre multicanal et appareil de fabrication associé
JP4671985B2 (ja) * 2007-04-10 2011-04-20 三菱電機株式会社 熱交換器及びこの熱交換器を備えた空気調和機
JP2009085468A (ja) * 2007-09-28 2009-04-23 Mitsubishi Materials Corp フィンチューブ型熱交換器およびその製造方法
JP4836996B2 (ja) 2008-06-19 2011-12-14 三菱電機株式会社 熱交換器及びこの熱交換器を備えた空気調和機
JP5525763B2 (ja) * 2009-06-12 2014-06-18 東芝キヤリア株式会社 伝熱管、熱交換器及び該熱交換器を備える空気調和機
JP6815205B2 (ja) * 2017-01-13 2021-01-20 三菱電機株式会社 扁平管、フィンチューブ式熱交換器、およびそれらの製造方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03128167A (ja) * 1989-10-13 1991-05-31 Matsushita Refrig Co Ltd 熱交換器の製造方法
JPH11320005A (ja) * 1998-05-13 1999-11-24 Showa Alum Corp 熱交換器及びその製造方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03128167A (ja) * 1989-10-13 1991-05-31 Matsushita Refrig Co Ltd 熱交換器の製造方法
JPH11320005A (ja) * 1998-05-13 1999-11-24 Showa Alum Corp 熱交換器及びその製造方法

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Free format text: NOTING OF LOSS OF RIGHTS PURSUANT TO RULE 69(1) EPC. EPO FORM 1205A DATED 18.10.2006

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