EP0143136B1 - Appareil de formage d'ailettes ondulées pour échangeurs de chaleur - Google Patents

Appareil de formage d'ailettes ondulées pour échangeurs de chaleur Download PDF

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Publication number
EP0143136B1
EP0143136B1 EP19830730084 EP83730084A EP0143136B1 EP 0143136 B1 EP0143136 B1 EP 0143136B1 EP 19830730084 EP19830730084 EP 19830730084 EP 83730084 A EP83730084 A EP 83730084A EP 0143136 B1 EP0143136 B1 EP 0143136B1
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EP
European Patent Office
Prior art keywords
fin
metal plate
corrugated
forming
corrugated fin
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.)
Expired
Application number
EP19830730084
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German (de)
English (en)
Other versions
EP0143136A1 (fr
Inventor
Shozo Takasago Technical Institute Satoh
Ryomyo Takasago Technical Institute Hamanaka
Michio Takasago Technical Institute Fujimoto
Mutsuo Nagoya Machinery Wks. Mitsubishi Onoue
Tatsunori Nagoya Machinery Wks. Mitsubishi Takaba
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.)
Mitsubishi Heavy Industries Ltd
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Mitsubishi Heavy Industries Ltd
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 Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Priority to DE8383730084T priority Critical patent/DE3370944D1/de
Priority to EP19830730084 priority patent/EP0143136B1/fr
Publication of EP0143136A1 publication Critical patent/EP0143136A1/fr
Application granted granted Critical
Publication of EP0143136B1 publication Critical patent/EP0143136B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D13/00—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form
    • B21D13/04—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form by rolling
    • 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
    • F28F1/126—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 consisting of zig-zag shaped fins

Definitions

  • the present invention relates to an apparatus for forming a corrugated fin for a heat exchanger which can contribute suitably to miniaturization and weight lightening of the heat exchanger.
  • Such a corrugated fin type heat exchanger can be manufactured by bending, in a hairpin style, a heat transfer pipe 2 equipped with union joints 1, at both the ends thereof, for connecting itself to other pipes; inserting corrugated fins 3 between straight portions of the heat transfer pipe 2; and securing the fins 3 to the pipe 2 with the aid of brazing.
  • corrugated fin 5 in which louvers 4 are formed in the flat portions thereof for the purpose of improving heat transfer performance
  • Figure 2 another example is a needle corrugated fin 6 in which the thin metal plate thereof is configured in the form of a ladder for the sake of, for example, decreasing a pressure loss on the air side, as shown in Figure 3
  • Japanese Utility Model Application No. 71462/1982 and Japanese Patent Application No. 35653/1982 Japanese Utility Model Application No. 71462/1982 and Japanese Patent Application No. 35653/1982.
  • US-A-3 137 337 in Figs. 4 and 5, provides that a sheet metal strip is compressed and formed by means of rotating barrel members rotating in two different directions and then it is discharged in the direction at a right-angle to the axis of the barrel members.
  • the aforesaid louvred corrugated fin 5 can be manufactured by means of a system as shown in Figure 4. That is to say, a strip metal plate 10 is fed to between a pair of confronted gear rolls 11, where a cutting of the louvers and a rough formation of a wavy shape are accomplished by a cutting means provided on tooth surfaces of each gear roll 11 and by a forming mechanism, respectively. Next, the wavy fin 12 is suppressed on the tops thereof by a suppressive spring plate 14 equipped with a pressure-adjusting member 13 in order to regulate a feed of the fin 12, thereby obtaining a desired pitch thereof. The thus prepared fin 12 is cut into a predetermined length, thereby manufacturing desired fin products.
  • the aforesaid needle corrugated fin 6 has less stiffness in the direction of a height h thereof than the louvred corrugated fin 6. Further, in the needle corrugated fin, it is necessary that the metal plate is closely corrugated narrowing each fin pitch P and that finishing is made with high accuracy, when its high performance is required. For these reasons, it is difficult to employ the conventional apparatus for manufacturing louvred corrugated fins as shown in Figure 4, for the formation of the needle corrugated fin, without any modification. Accordingly, an improvement in the apparatus has been desired by which the formation of the fin can be carried out efficiently.
  • the apparatus of the present invention for achieving the above-mentioned object may comprise a pair of confronted gear rolls for roughly forming, into a wavy shape, a strip metal plate in which a group of ladderlike or netlike needle fin units is previously formed, and a pair of screw shafts rotatably disposed in parallel with a feeding passage of the roughly formed strip metal plate and on opposite sides of the feeding passage, the screw shafts being provided with helical blades on outer peripheries thereof, the pitch of the blades being constituted so as to gradually approach to a predetermined fin pitch toward front edges of the screw shafts, the blades serving to compressively form the strip metal plate into a wavy shape by being brought into contact with valleylike portions of the strip metal plate.
  • Another object of the present invention is to provide an apparatus for forming a corrugated fin . to which reinforcing tapes are attached.
  • the flat corrugated fin 3 and the louvred corrugated fin 5 are extremely low in stiffness and tend to be easily bent and distorted. Further, when the corrugated fins which have been thus formed are stocked overlapping each other, the curved portions 7 of the corrugated fins get disadvantageously in between flat portions 8 thereof. In other words, while being stocked, the corrugated fins will become entangled, which fact will make troublesome handling such as their conveyance to a farther process.
  • the thin metal plate of approximately 0.3 mm in thickness is used, and the needle fins 9 of approximately 0.3 mm in diameter are punched out, thereby obtaining a ladderlike shape. Therefore, its stiffness is also disadvantageously at a low level, as in the case of the above louvred corrugated fin.
  • the present invention has now been accomplished, and its object is to provide an apparatus for forming a corrugated fin having supporting means by which the fin pitch of the corrugated fin can be retained and the stiffness can be enhanced without altering a configuration of the fin and a thickness of the used metal plate.
  • the apparatus of the present invention for achieving the above-mentioned object further includes a device for attaching tapes to free areas of the corrugated fin which will be joined to the heat transfer pipe with a predetermined fin pitch, so as to retain the fin pitch.
  • the apparatus for forming the needle corrugated fins comprises a pair of upper-side and lower-side molds 22 for punching holes in a strip metal plate 21 to form it into a ladderlike shape, thereby obtaining a primary processed strip metal plate 23 having a group of needle fin units, as shown in Figure 5 (a); a rough forming section 24 for roughly forming the primary processed strip metal plate 23 into a wavy shape; and a compressive forming section 26 for compressively forming the roughly formed, i.e. secondarily processed strip metal plate 25 so that it may have a predetermined closer fin patch P, as shown in Figure 5 (b).
  • a pair of gear rolls 27 which can be rotated at a constant speed while engaged with each other, and the primary processed ladderlike strip metal plate 23 is fed to between this pair of gear rolls 27 in order to form it into the wavy shape.
  • rolls are used which are slightly longer in the axial direction thereof than the width of the strip metal plate 21, i.e. a height h of the fin joined to a heat transfer pipe.
  • the gear rolls 27 may be employed each of which has a thin-wall gear structure only at the opposite ends thereof and includes no gear structure on the central portion thereof. Furthermore, as for teeth of the rolls 27, tooth tops thereof and tooth bottoms there-. between are rounded in the form of arc which is suitable for corrugation.
  • FIG. 6 The above-mentioned compressive forming section 26 is illustrated in Figures 6, 7 and 8.
  • a pair of screw shafts 30 is disposed in parallel with a feeding passage of the secondarily processed strip metal plate 25 which is provided on a bed 28 and on the opposite sides of the above feeding passage, and bearing-supporting plates 29 are disposed on right and left sides of the screw shafts 30, when viewed from plan, across the above feeding passage.
  • the screw shafts 30 are rotatably mounted on bearings (not shown) in the bearing-supporting plate 29.
  • the above bearings may be constituted movably inside the bearing-supporting plate 29 so as to adjust the space between the respective screw shafts 30.
  • Each screw shaft 30 is provided with blades 31 on the outer periphery thereof.
  • These blades 31 serve to compressively form the roughly wavily formed, i.e. secondarily processed strip metal plate 25 (hereinafter also referred to as the wavy metal plate) into the fin structure having a predetermined pitch by a contact of the outer peripheral tops of the blades with valleylike portions of the metal plate 25 and by a forward movement of the metal plate 25 with the aid of the rotation of the screw shafts 30.
  • the blades are helically constituted so that intervals therebetween may become gradually narrower toward the front end of each screw shaft 30 and so that the pitch of the blades in the vicinity of the front end thereof may be equal to a predetermined pitch of the fin.
  • the above-mentioned screw shafts 30 are adapted to be rotated reversely to each other. Therefore, helical directions of the blades 31 on the respective screw shafts 30 are reverse to each other, and the wavy metal plate 25 can thus be forward moved in the feeding direction by means of the rotation of the screw shafts 30.
  • a follower 32 which engages with a pinion of an electric motor (not shown) is fixed to a flexible drive-shaft 33. By rotating the follower 32, either screw shaft 30 can be rotated via a bevel gear 34 at the other end of the flexible drive-shaft 33 and another bevel gear 35 at an end of the screw shaft 30.
  • a transmission gear 36 at the other end of the above screw shaft 30 rotates a gear 39 fixed at an end of the other screw 30 via intermediate gears 37 and 38.
  • both the screw shafts 30 can be rotated in directions reverse to each other and at an equal speed.
  • the disposition of the flexible drive-shaft 33 and the intermediate gears 37 and 38 permits the screw shafts 30 to be moved in parallel for the purpose of adjusting the space therebetween by sliding the screw shaft 30, while the engagement between the bevel gears 34 and 35 is maintained and while the transmission gear 36 and the gear 39 are in contact with the intermediate gears 37 and 38.
  • the gear rolls 27 for the rough formation and the screw shafts 30 are connected to each other so that they may be rotated at a constant rotational ratio.
  • the rotational frequency of the gear roll 27 is set to I/n of that of the follower 32.
  • the bed 28 is provided with a base stand 40 for supporting the wavy metal plate 5, on the lower side thereof, which is fed between the screw shafts 30.
  • the base stand 40 includes a cylindrical feeding guide 41 having an enlarged inlet on the rear side of the compressive forming section 26, and a discharge guide 42 on the front side thereof. Additionally, reference numeral 44 represents a counter for counting the rotational frequency of the screw shafts 30.
  • the formation may be carried out by means of the thus constituted apparatus according to the present invention, as follows:
  • the needle corrugated fins 43 can be continuously formed. Further, it is possible by the use of the counter 44 to know the number of the corrugated fins 43 produced.
  • the needle corrugated fins having the pitch of 0.8 to 1.0 mm may be obtained, though that of the conventional corrugated fins is 1.5 to 2.0 mm. Moreover, in the present case it is unnecessary to apply a force to the tops ofthefins atthe time ofthe formation as in the conventional apparatus. Therefore, even if the group of needle fin units has a low stiffness, the metal plate can be compressively formed into the predetermined fin pitch structure corresponding to the pitch of the blades with high accuracy, and the formation can be carried out easily and rapidly.
  • the strip metal plate having a group of ladderlike needle fin units but the pattern of the fin is not limited to such a style.
  • the metal plate having a group of netlike needle fin units as shown in Figure 9 can also be compressively formed with ease by means of the apparatus of the present invention.
  • the wavy metal plate 50 which has been provided with a group of needle fin units and formed roughly into a wavy shape in the preceding process, is fed to between the screw shafts 52.
  • Each screw shaft 52 is provided with helical forming blades 51 thereon so that intervals between the blades may become gradually narrow toward the front end of the screw shaft 52, and the respective screw shafts 52 are mutually arranged so that the blades 51 on one screw shaft may be placed at positions of 1/2 pitch of the blades on the other shaft.
  • the tops of the blades 51 are engaged with the valleylike portions of the wavy metal plate 50, and the wavy metal plate 50 is compressively formed into a closer wavy shape. Afterward, the wavy metal plate 50 is fed to between the pair of fin pitch-regulating screw shafts 53 disposed in an upper and lower relation in order to obtain a predetermined fin pitch.
  • the needle corrugated fin 6 will be joined to the heat transfer pipe 2, with opposite edges of the fin 6 in a width direction thereof directly connected to the pipe 2. Therefore, as seen best in Figure 12, tapes 54 are attached to the needle fin 9 adjacent to curved free areas 7, of the needle corrugated fin 6, in a plane crossing at right angle a plane including the edge portions which will be directly connected to the heat transfer pipe 2.
  • tape-attaching mechanisms 55 are disposed in the vicinity of an outlet of the fin pitch-regulating screw shaft 53 and on right and left sides thereof when viewed from plan.
  • the tapes 54 which are wound on supporting shafts in a roll form are fed via tension rolls 56 and pressure rolls 57 for pressing the tapes against both the sides of the needle corrugated fin 6 to cause the former to adhere to the latter.
  • an adhesive is applied to an attaching surface of each tape 54 from adhesive-applying nozzle 58.
  • the feeding speed of the tapes 54 and the speed of attaching them to the needle-corrugated fin 6 are caused to coincide with the formation speed of the corrugated fin 6, so that the tapes 54 can smoothly be pressed against the curved portions 7 by the pressure rolls 57, thereby ensuring the adhesive attachment.
  • the tapes 54 are adhesively and combinedly attached to the curved portions 7, which will not be directly connected to the heat transfer pipe 2, of the needle corrugated fin 6, as shown in Figure 12, whereby its desired fin pitch is maintained and its stiffness is heightened.
  • the needle corrugated fin 6 to which the tapes 54 has been thus caused to combinedly adhere is cut into a predetermined length each by means of a cutter not shown here, and the resultant products are afterward stocked.
  • a high-energy non-contact cutting is carried out by using laser beam, light beam or the like for the sake of inhibiting a deformation of the fin by the cutting operation.
  • the needle corrugated fin products 6 having the tapes 54 are inserted into between straight portions of the heat transfer pipe 2, and they are then dipped in a washing tank or the like containing a solution therein to dissolve the adhesive before securing, in order to remove the adhesive. Afterward, the needle corrugated fins 6 are secured to the heat transfer pipe 2 by brazing or another manner.
  • the adhesive attachment of the tapes 54 to the fin 6 can be accomplished while the former is pressed against the latter by the pressure roll 57 and while the fin 6 is carried by the fin pitch-regulating screw shafts 53, therefore the shafts 53 function as spacers in order to prevent the fin from being deformed by the applied force.
  • the shafts 53 function as spacers in order to prevent the fin from being deformed by the applied force.
  • the tapes 54 are caused to combinedly adhere to the opposite edges in a width direction of the corrugated fin which are not directly connected to the heat transfer pipe 2, because the portions which will be directly connected thereto are the curved portions 7 of the corrugated fin.
  • the above tape can be made of an optical material such as paper, and an adhesive tape on which an adhesive has previously been applied can also be utilized, in this case the adhesive-applying nozzles can be omitted.
  • the tapes are combinedly attached to the free areas, which are not directly connected to the heat transfer pipe, of the corrugated fin. Accordingly, the fin pitch of the formed fin can be uniformly maintained, and the stiffness of the corrugated fin can be enhanced. As a result, the produced fins are hard to be distorted or curved, and each of them can be handled as one block. Therefore, the insertion of the fins in between the straight portions of the heat transfer pipe can be mechanized and automated, which fact permits the manufacturing efficiency of the heat exchangers to be improved to a noticeable degree. Further, the tapes are combinedly attached to the areas which are unconcerned with the connection to the heat transfer pipe.
  • the adhesive can be removed by an easy operation such as dipping them into a washing tank containing a solution to dissolve the adhesive, whereby a further process of brazing can be carried out without any trouble. Furthermore, while stocked, the corrugated fins having the tapes are not entangled with other adjacent fins, which fact can make their handling easy, for example, they can be carried smoothly to a further step.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)

Claims (2)

1. Appareil pour former une ailette ondulée pour un échangeur de chaleur, dans lequel sont prévues une paire de roues dentées (27) en vis-à- vis pour former à l'état d'ébauche une plaque de métal (23) en forme de bande dans un aspect ondulé, une paire d'arbres rotatifs (26) parallèles avec la direction d'introduction de ladite plaque de métal (23) en forme de bande, et une lame hélicoïdale (31) disposée sur la circonférence externe de chacun desdits arbres, chacune desdites lames hélicoïdales (31) étant amenée en contact avec un creux de ladite plaque de métal (23) en forme de bande à l'état d'ébauche, en compressant et en formant ainsi ladite plaque de métal (23) en forme de bande avec l'ondulation souhaitée, caractérisé en ce que l'appareil comprend un mécanisme (55) pour l'adhésion d'un ruban (54) sur chaque côté latéral de l'ailette ondulée (6).
2. Appareil pour former une ailette ondulée pour un échangeur de chaleur selon la revendication 1, dans lequel il est prévu un arbre supplémentaire à lame hélicoïdale (fig. 10, 53), ledit arbre supplémentaire à lame hélicoïdale étant situé entre la partie de sortie de ladite paire d'arbres (26) et ledit mécanisme (55), ledit arbre supplémentaire à lame hélicoïdale (53) s'engageant avec la plaque (50) en forme de bande ondulée à proximité de ladite partie de sortie pour former le pas final souhaité.
EP19830730084 1983-09-01 1983-09-01 Appareil de formage d'ailettes ondulées pour échangeurs de chaleur Expired EP0143136B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE8383730084T DE3370944D1 (en) 1983-09-01 1983-09-01 Apparatus for forming corrugated fins for heat exchangers
EP19830730084 EP0143136B1 (fr) 1983-09-01 1983-09-01 Appareil de formage d'ailettes ondulées pour échangeurs de chaleur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19830730084 EP0143136B1 (fr) 1983-09-01 1983-09-01 Appareil de formage d'ailettes ondulées pour échangeurs de chaleur

Publications (2)

Publication Number Publication Date
EP0143136A1 EP0143136A1 (fr) 1985-06-05
EP0143136B1 true EP0143136B1 (fr) 1987-04-15

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Application Number Title Priority Date Filing Date
EP19830730084 Expired EP0143136B1 (fr) 1983-09-01 1983-09-01 Appareil de formage d'ailettes ondulées pour échangeurs de chaleur

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EP (1) EP0143136B1 (fr)
DE (1) DE3370944D1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4838065A (en) * 1987-12-31 1989-06-13 Wallis Bernard J Corrugated fin forming apparatus
US5937519A (en) * 1998-03-31 1999-08-17 Zero Corporation Method and assembly for manufacturing a convoluted heat exchanger core
DE102017217568A1 (de) * 2017-10-04 2019-04-04 Mahle International Gmbh Wärmeübertrager

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3137337A (en) * 1960-03-11 1964-06-16 Standard Products Co Apparatus for and methods of making a sheet metal strip structure
US3064694A (en) * 1961-05-03 1962-11-20 Wire O Corp Wire forming machine
DE1452647A1 (de) * 1964-04-15 1969-04-30 Ford Motor Co Verfahren und Vorrichtung zum Falten von Blechstreifen
FR2003600A1 (fr) * 1969-05-05 1969-11-07 Liouville Roger
US4174945A (en) * 1977-03-11 1979-11-20 Gertz David C Corrugated panel and apparatus for manufacturing the same
DE2809365A1 (de) * 1978-03-04 1979-09-13 Schaefer Werke Gmbh Verfahren zum herstellen gewellter bleche, vorrichtung zur durchfuehrung des verfahrens und nach dem verfahren hergestellte gegenstaende
US4178972A (en) * 1978-08-14 1979-12-18 Hans Sickinger Co. Machine for manufacturing zig zag wire binders
AU542944B2 (en) * 1982-04-14 1985-03-28 Nippondenso Co. Ltd. Cutting corrugated member

Also Published As

Publication number Publication date
DE3370944D1 (en) 1987-05-21
EP0143136A1 (fr) 1985-06-05

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