WO2023176874A1 - 熱交換器および熱交換器の製造方法 - Google Patents

熱交換器および熱交換器の製造方法 Download PDF

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Publication number
WO2023176874A1
WO2023176874A1 PCT/JP2023/010041 JP2023010041W WO2023176874A1 WO 2023176874 A1 WO2023176874 A1 WO 2023176874A1 JP 2023010041 W JP2023010041 W JP 2023010041W WO 2023176874 A1 WO2023176874 A1 WO 2023176874A1
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WO
WIPO (PCT)
Prior art keywords
heat exchanger
plate
bent
fins
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.)
Ceased
Application number
PCT/JP2023/010041
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
隆徳 新村
崇志 中島
友理子 大熊
善命 伊藤
幸大 宮川
規夫 勝間
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 Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP2024508214A priority Critical patent/JP7766785B2/ja
Priority to DE112023001430.2T priority patent/DE112023001430T5/de
Priority to US18/838,266 priority patent/US20250164192A1/en
Publication of WO2023176874A1 publication Critical patent/WO2023176874A1/ja
Anticipated expiration legal-status Critical
Ceased 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
    • B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
    • B21D11/10—Bending specially adapted to produce specific articles, e.g. leaf springs
    • 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
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/08—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being otherwise bent, e.g. in a serpentine or zig-zag
    • 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
    • B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
    • B21D11/08—Bending by altering the thickness of part of the cross-section of the work
    • 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
    • B21D53/00—Making other particular articles
    • B21D53/02—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers
    • B21D53/08—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of both metal tubes and sheet metal
    • 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
    • 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
    • F28F1/128—Fins with openings, e.g. louvered fins
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2255/00—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes
    • F28F2255/02—Flexible elements

Definitions

  • the present disclosure relates to a heat exchanger and a method of manufacturing the heat exchanger.
  • Some heat exchangers have partially bent headers that distribute or collect refrigerant into heat transfer tubes in order to make it easier to incorporate into the device.
  • Such a heat exchanger is manufactured by attaching heat transfer tubes and fins to a linearly extending header and then bending the header. Therefore, in such a heat exchanger, the fins may be deformed during the bending process of bending the header. In order to prevent this deformation of the fins, heat exchangers that prevent the deformation of the fins have been developed.
  • Patent Document 1 two types of fins having different widths in the depth direction are arranged alternately in the direction in which the heat exchanger tubes are arranged in a plurality of gaps formed between heat exchanger tubes arranged in a bent portion of a header.
  • a heat exchanger is disclosed.
  • Patent Document 1 states that by using two types of fins with different widths in the depth direction, it is possible to avoid large deformation or breakage of the fins during the bending process when manufacturing a heat exchanger. ing.
  • the present disclosure has been made to solve the above-mentioned problems, and provides a heat exchanger and a method for manufacturing the heat exchanger in which deformation of the heat exchanger tubes in the bent portion of the header is suppressed and a decrease in heat exchange efficiency is suppressed.
  • the purpose is to provide.
  • a heat exchanger includes a first header having a first bent part, and a second bent part that is bent in the same direction as the first bent part and facing the first bent part.
  • a second header having a second header, a plurality of first heat exchanger tubes arranged along the first bent portion and connecting the first bent portion and the second bent portion, and a plurality of first heat exchanger tubes provided between adjacent first heat exchanger tubes, respectively.
  • a plurality of fins that transfer heat from the first heat exchanger tube. At least one of the plurality of fins has a low-strength portion that is less rigid than other portions of the plurality of fins and more easily deforms than other portions when the spacing between adjacent first heat transfer tubes changes. .
  • At least one of the plurality of fins has lower rigidity than other parts of the plurality of fins, and has a lower rigidity than other parts when the distance between adjacent first heat exchanger tubes changes. It has low-strength parts that are easily deformed. Therefore, if the spacing between the first heat exchanger tubes changes during the bending process to form the first and second bent portions on the first and second headers, the low-strength portion of the fin will transforms before. As a result, deformation of the first heat exchanger tube is suppressed. Moreover, as a result of suppressing deformation of the first heat exchanger tube, a decrease in heat exchange efficiency of the heat exchanger is suppressed.
  • a perspective view of a heat exchanger according to Embodiment 1 of the present disclosure An enlarged perspective view of the II area shown in FIG. 1 when viewed from the back side
  • An enlarged perspective view of a fin attached to a heat transfer tube connected to a bent portion of a header included in a heat exchanger according to Embodiment 1 of the present disclosure A cross-sectional view of a fin located at a position vertically overlapping a bent portion of a heat exchanger according to Embodiment 1 of the present disclosure
  • Flowchart of a method for manufacturing a heat exchanger according to Embodiment 1 of the present disclosure A front view of a plurality of heat exchanger tubes with fins and unprocessed fins sandwiched between them in the assembly process of a semi-finished heat exchanger included in the method for manufacturing a heat exchanger according to Embodiment 1 of the present disclosure.
  • a front view of a semi-finished heat exchanger manufactured in the process of assembling a semi-finished heat exchanger included in the heat exchanger manufacturing method according to Embodiment 1 of the present disclosure An enlarged rear view of a part of the heat exchanger when the heat exchanger tubes included in the modified example of the heat exchanger according to Embodiment 1 of the present disclosure are bent.
  • a perspective view enlarging a portion of heat exchanger tubes and fins included in a heat exchanger according to Embodiment 2 of the present disclosure A partially enlarged perspective view of a modified example of a heat exchanger according to Embodiment 2 of the present disclosure
  • a partially enlarged perspective view of another modification of the heat exchanger according to Embodiment 2 of the present disclosure A perspective view enlarging a portion of heat exchanger tubes and fins included in a heat exchanger according to Embodiment 3 of the present disclosure
  • a partially enlarged perspective view of a modified example of a heat exchanger according to Embodiment 3 of the present disclosure A sectional view enlarging a portion of fins included in a heat exchanger according to Embodiment 4 of the present disclosure
  • a perspective view enlarging a portion of heat exchanger tubes and fins included in a heat exchanger according to Embodiment 5 of the present disclosure Developed view of a modified example of the heat exchanger according to Embodiment 1 of the present
  • the vertical direction is the vertical direction when the direction in which the tube axes of the plurality of heat exchanger tubes included in the heat exchanger extend is the vertical direction, and the direction in which the heat exchanger tubes are arranged is the horizontal direction.
  • the Z-axis, the left-right direction is the X-axis, and the direction perpendicular to the Z-axis and the X-axis is the Y-axis.
  • the heat exchanger according to Embodiment 1 is a heat exchanger in which the fins in the bent portions of the headers include low-strength portions in order to suppress deformation of the heat exchanger tubes.
  • the configuration of the heat exchanger will be described using an example in which the heat exchanger is used in an outdoor unit of an air conditioner. First, the overall configuration of the heat exchanger will be described with reference to FIGS. 1 and 2.
  • FIG. 1 is a perspective view of a heat exchanger 1A according to the first embodiment.
  • FIG. 2 is an enlarged perspective view of the II region shown in FIG. 1 when viewed from the back side B.
  • FIG. 1 shows only the heat exchanger tubes 20 and fins 30 in a part of the heat exchanger 1A, and omits the heat exchanger tubes 20 and fins 30 in other parts.
  • FIG. 2 only three heat exchanger tubes 20 adjacent to each other in the left-right direction and two fins 30 between them are shown.
  • the heat exchanger 1A includes headers 11 and 12 for distributing and consolidating refrigerant, a plurality of heat exchanger tubes 20 connected to the headers 11 and 12 and through which the refrigerant flows, and a plurality of heat exchanger tubes 20 through which the refrigerant flows.
  • a plurality of fins 30 are attached.
  • the headers 11 and 12 are formed in the shape of a square tube. Although not shown, flow paths are formed inside the headers 11 and 12. Further, the headers 11 and 12 have circular tubular connecting portions 13 and 14 shown in FIG. 1, and connecting pipes of external equipment (not shown) for supplying and discharging refrigerant are connected to these connecting portions 13 and 14. . When external devices are connected to the headers 11 and 12, refrigerant is caused to flow through the internal flow paths.
  • the headers 11 and 12 are arranged vertically apart from each other with the tube axes A1 and A2 oriented in the horizontal direction.
  • a plurality of heat transfer tubes 20 are connected to the headers 11 and 12 in order to allow the refrigerant to flow between them.
  • Each of the heat transfer tubes 20 is formed into a tubular shape in order to allow the refrigerant to flow therethrough.
  • the heat exchanger tubes 20 extend in the vertical direction. Furthermore, the upper and lower ends of the heat exchanger tubes 20 are inserted into insertion holes (not shown) in the cylindrical walls of the headers 11 and 12. Thereby, the heat exchanger tube 20 is connected to the headers 11 and 12. As a result, the refrigerant flows through the heat exchanger tubes 20 by flowing through the headers 11 and 12 .
  • each of the heat transfer tubes 20 is made of a metal with high thermal conductivity, such as pure aluminum or an aluminum alloy, in order to easily transfer the heat of the refrigerant flowing inside.
  • the heat exchanger tube 20 is formed to have a flat tube cross section in order to facilitate the transfer of heat from the refrigerant. That is, the heat exchanger tube 20 is a flat tube.
  • the heat exchanger tubes 20 are arranged at a constant pitch in the tube axis direction of the headers 11 and 12. Thereby, a gap is provided between the heat exchanger tubes 20. Fins 30 are provided in the gap in order to release the heat transferred to the heat transfer tube 20 to the surrounding air.
  • the fins 30 are made of a metal with high thermal conductivity, such as a metal made of the same material as the heat exchanger tube 20, in order to facilitate the transfer of heat from the heat exchanger tube 20. Further, the fins 30 are formed into a plate shape, as shown in FIG. 2, in order to easily release the heat into the surrounding air. Further, the plate of the fin 30 is bent into a corrugated shape. The fins 30 are sandwiched between adjacent heat transfer tubes 20 with the corrugated peaks and valleys facing the flat surface of the heat transfer tubes 20. The corrugated peaks and valleys of the fins 30 are joined to the heat exchanger tubes 20, respectively. Thereby, the fins 30 are attached to the heat exchanger tubes 20. As a result, the fins 30 release the heat transferred from the heat transfer tubes 20 into the air from the surface of the corrugated plate.
  • the headers 11 and 12 are bent into an L-shape in order to be incorporated into the rectangular parallelepiped casing of the outdoor unit. Specifically, the headers 11 and 12 are bent at right angles, resulting in L-shaped bent portions 15 and 16, and straight portions 17 and 18 that are connected to the bent portions 15 and 16 and extend linearly.
  • the bent portions 15 and 16 are produced by assembling a semi-finished heat exchanger including the linearly extending headers 11 and 12 and then bending the semi-finished heat exchanger. . During the bending process, compressive force is applied to the inside of the semi-finished heat exchanger. As a result, the fins 30 may be deformed into an irregular shape. As a result, the ventilation resistance varies among the fins 30, and the heat exchange efficiency of the heat exchanger 1A may decrease.
  • the heat exchanger tube 20 may be deformed due to the compressive force during the bending process, and the flow path inside the heat exchanger tube 20 may be blocked or the flow path may become smaller. As a result, the heat exchange efficiency of the heat exchanger 1A may decrease.
  • the deformation of the heat exchanger tubes 20 is In order to suppress this preferentially, the fins 30 in the bent portions 15 and 16 are provided with low-strength portions at specific locations that have lower rigidity than other portions and are more easily deformed by bending.
  • fins 40A the fins 30 located at the bent portions 15 and 16 will hereinafter be referred to as fins 40A.
  • FIG. 3 is an enlarged perspective view of the fins 40A attached to the heat exchanger tubes 20 connected to the bent portions 15 and 16 of the headers 11 and 12.
  • FIG. 4 is a cross-sectional view of the fin 40A located at a position vertically overlapping the bent portions 15 and 16 of the heat exchanger 1A. Note that FIG. 3 is an enlarged perspective view of the IV region shown in FIG. 1 when viewed from the back side B. Moreover, in FIG. 4, the internal structure of the heat exchanger tube 20 is omitted for easy understanding.
  • the fin 40A like the fin 30, has a shape in which a plate is bent into a corrugated shape in which waves are continuous in the vertical direction. Then, the ridge portion 401 of the corrugate contacts the heat exchanger tube 20 on the +X side, and the trough portion 402 of the corrugation contacts the heat exchanger tube 20 on the ⁇ X side. Further, each of the peak portion 401 and the valley portion 402 is connected by each plate-like portion 41. In other words, the fin 40A has a plurality of plate-shaped portions 41 that cross the gap between the heat transfer tubes 20 from one side of the adjacent heat transfer tubes 20 to the other.
  • Such fins 40A are attached to the heat exchanger tubes 20 at the bent portions 15 and 16 of the headers 11 and 12.
  • Each of the plate-like portions 41 of the fin 40A is provided with a low-strength portion.
  • the low-strength portion is a portion that is formed in the plate-like portion 41 of the fin 40A and has lower rigidity than other portions of the plate-like portion 41.
  • the low-strength portion refers to the plate-shaped portion 41 when the gap between adjacent heat exchanger tubes 20 changes, for example, when the gap between the heat exchanger tubes 20 on the inner side of the bending narrows due to bending. This part is more easily deformed than other parts. "Easier to deform than other parts" means, for example, in the case of the heat exchanger 1A, that it is easier to bend than other parts.
  • the low-strength portion is formed by a fin bent portion 42 in which a plate-like portion 41 is bent into a shape that projects downward.
  • the fin bent portion 42 has a shape in which the plate portion 41 is bent into a V-shape at the center in the direction in which the heat transfer tubes 20 are arranged. That is, the fin bent portion 42 has a shape in which the plate portion 41 is bent in a V-shape in the middle between adjacent heat exchanger tubes 20 .
  • the fin bent portion 42 is more likely to deform than other portions of the plate-like portion 41. Cheap. Then, when the size of the gap between the heat exchanger tubes 20 changes, the fin bent portions 42 deform into a shape in which the V-shaped angle becomes larger, or into a shape in which the V-shaped angle becomes smaller.
  • the fin bending portion 42 expands and contracts while maintaining the crease like the bellows during the bending process during manufacturing, thereby regularly deforming the fin 40A.
  • the fin bent portions 42 prevent the fins 40A from being irregularly deformed due to the bending process, thereby preventing the ventilation performance from deteriorating. Further, the fin bent portion 42 maintains the ventilation performance of the fin 40A to some extent.
  • the fin bent portions 42 expand and contract like bellows, thereby suppressing the concentration of compressive force on the heat exchanger tubes 20. Thereby, the fin bent portions 42 suppress deformation of the heat exchanger tubes 20.
  • the fin bent portion 42 has a V-shaped tip that projects downward. As a result, when water droplets adhere to the fins 40A, the fin bending portion 42 collects the water droplets to the tip of the V-shape and discharges them. As a result, the fin bent portions 42 improve the drainage performance of the fins 40A.
  • the fin bent portion 42 is formed at the end portion of the plate portion 41 facing the inside of the bend in order to enable deformation according to the compressive force applied during the bending process during manufacturing.
  • the bent portion 16 of the header 12 has a shape that is bent toward the back side B when viewed from the right. Therefore, the inner side of the bending portion 16 is the back side B. A large compressive force is likely to be applied to the back side B of the bent portion 16 during the bending process during manufacturing. Therefore, the fin bent portion 42 is formed in a portion of the plate-shaped portion 41 that includes the end face on the back side B, that is, on the end face on the back side B and a portion near the end face.
  • the end surface refers to the side surface of the plate-like portion 41 when the plate surface is faced upward or downward.
  • the fin bent portion 42 has an isosceles triangular shape with its base facing the end surface of the back side B of the plate portion 41 when the plate portion 41 is viewed from a direction perpendicular to the plate surface.
  • the fin bent portion 42 is formed by bending the plate portion 41 so that the equilateral sides of the isosceles triangle form mountain folds 421 and 422.
  • the fin bent portion 42 is formed by bending the plate portion 41 with a perpendicular line drawn from the apex 423 of the isosceles triangle to the base as a valley fold crease 424.
  • the area of the bent portion of the plate portion 41 increases as it goes toward the back side B.
  • the compressive force applied during the bending process during manufacturing is greater toward the back than the neutral plane.
  • the area of the fin bent portion 42 increases toward the back side B, thereby enabling deformation in response to compressive force. Thereby, the fin bent portion 42 is more easily deformed than the heat exchanger tube 20 by the compressive force of the bending process, and as a result, the compressive force of the bending process is less likely to be applied to the heat exchanger tube 20.
  • the plate portion 41 is bent into the above shape, so that the V-shaped bending becomes larger toward the back side B.
  • the fin bent portion 42 forms a V-shaped groove on the upper surface side of the plate-like portion 41 that becomes deeper toward the back side B, as shown in FIG.
  • the fin bending portion 42 effectively discharges the water droplets to the outside of the fin 40A.
  • the apex 423 which is the joint between the folds 421 and 422, be at or near the neutral plane of the plate-shaped portion 41. This is because, with such a configuration, the fin bent portions 42 can be effectively arranged at locations where compressive force is generated during the bending process during manufacturing.
  • FIG. 5 is a flowchart of the method for manufacturing the heat exchanger 1A.
  • FIG. 6 is a front view of a plurality of heat exchanger tubes 20 with fins 30 and unprocessed fins 50 sandwiched between them in the assembly process of the semi-finished heat exchanger 2 included in the method for manufacturing the heat exchanger 1A.
  • FIG. 7 is a front view of the heat exchanger 2 in a semi-finished product state produced in the assembly process of the heat exchanger 2 in a semi-finished product state included in the method for manufacturing the heat exchanger 1A.
  • a straight tubular header, heat exchanger tubes 20, and fins 30 are manufactured (step S1).
  • the straight tubular header refers to a header in which the tube axis extends linearly without the bent portions 15 and 16, and refers to a header before being processed into the headers 11 and 12.
  • two straight tubular headers are manufactured by pressing a metal plate made of the above-mentioned material.
  • the fins 30 having the above-mentioned shape are manufactured by pressing a metal plate made of the above-mentioned material. Further, in order to obtain a semi-finished product to be processed into the fin 40A, a fin having a longer length from the peak portion 401 to the valley portion of the corrugate than the fin 30 is produced. Note that this fin will hereinafter be referred to as an unprocessed fin.
  • the heat exchanger tube 20 having the above-mentioned shape is produced by extruding the metal material of the above-mentioned quality.
  • the heat exchanger 2 in a semi-finished state is assembled using the produced straight tubular header, heat transfer tubes 20, fins 30, and unprocessed fins (step S2).
  • a plurality of heat exchanger tubes 20 are arranged with their tube axes facing the same direction and flat surfaces facing each other.
  • the fins 30 or unprocessed fins are sandwiched between the heat exchanger tubes 20, with the peak portions 401 and valley portions 402 of the corrugates facing toward the flat surface of the heat exchanger tubes 20.
  • the unprocessed fins 50 are sandwiched between the heat exchanger tubes 20 that are attached to the portions P1 of the straight tubular headers 21 and 22 that will become the bent portions 15 and 16 in step S3, which will be described later.
  • Fins 30 are sandwiched between the heat exchanger tubes 20 attached to the other parts P2 and P3 of the straight tubular headers 21 and 22.
  • the fin bent portion 42 is formed (step S3).
  • the unprocessed fins 50 of the manufactured heat exchanger 2 in a semi-finished state have a plate-like part 41 connecting a corrugated peak part 401 and a valley part 402, as in the case shown in FIG. There are multiple. Then, these plate-like portions 41 cross the gap between the heat exchanger tubes 20.
  • the comb teeth of a comb-like tool are inserted from the back side B into the gaps between the heat exchanger tubes 20 and pressed against each of the plate-like parts 41.
  • Each of the shaped portions 41 is bent into the above-mentioned V shape.
  • a fin bent portion 42 is formed on the back surface of the plate-like portion 41, in which the V-shaped groove is shallower than in the case described with reference to FIG.
  • the fin 40A including the fin bent portion 42 is manufactured.
  • the semi-finished heat exchanger 2 is bent (step S4).
  • step S2 is also referred to as an assembly process of the heat exchanger 2 in a semi-finished state.
  • step S3 is also referred to as a manufacturing process or a bending process of the heat exchanger 1A.
  • the fin bent portion 42 is also referred to as a collapsed portion since the plate portion 41 is collapsed downward.
  • the straight tubular header 21 and the straight tubular header 22 produced in step S1 are examples of a first header having a first straight pipe portion and a second header having a second straight pipe portion as referred to in the present disclosure.
  • the headers 11 and 12 described above are examples of the first header and the second header in the present disclosure.
  • the bent portions 15 and 16 are examples of the first bent portion and the second bent portion in the present disclosure.
  • the straight parts 17 and 18 are examples of the first straight part and the second straight part in the present disclosure.
  • the fin 40A and the fin 30 are examples of a first fin and a second fin in the present disclosure.
  • the heat exchanger tubes 20 located at the bent portions 15 and 16 are examples of first heat exchanger tubes as referred to in the present disclosure.
  • the heat exchanger tubes 20 located in the straight portions 17 and 18 are an example of second heat exchanger tubes as referred to in the present disclosure.
  • the fins 40A are attached to the heat transfer tubes 20 at the bent portions 15 and 16, and the fins 40A include the fin bent portions 42 which are low strength portions.
  • the fin bent portions 42 have lower rigidity than other parts and are more easily deformed than other parts when the distance between adjacent heat exchanger tubes changes, so the heat exchanger tubes 20 are bent during the bending process during the manufacturing of the heat exchanger 1A.
  • the fin bent portions 42 of the fins 40A between the heat exchanger tubes 20 deform before the other portions.
  • compressive force is less likely to concentrate on the heat exchanger tubes 20, and deformation of the heat exchanger tubes 20 is suppressed.
  • a decrease in heat exchange efficiency of the heat exchanger 1A is suppressed.
  • the fin bent portion 42 is formed at the end portion of the plate portion 41 of the fin 40A that faces the inside of the bend, compressive force is easily applied during the above bending process. As a result, even if a compressive force is applied to the heat exchanger tube 20 in the bending process, the compressive force tends to concentrate on the fin bent portion 42, and it is difficult to concentrate the compressive force on the heat exchanger tube 20. Moreover, in the heat exchanger 1A, deformation of the heat exchanger tubes 20 can be suppressed by simply forming the fin bent portions 42 at the ends of the plate-like portions 41 that face the bending inner side. Therefore, it is easy to manufacture the heat exchanger 1A in which deformation of the heat exchanger tubes 20 is suppressed.
  • the fin bent portion 42 is bent into a shape in which the plate portion 41 of the fin 40A protrudes toward one plate surface side.
  • the fin bending portions 42 can change the amount of protrusion depending on the compressive force of the bending process, thereby suppressing the compressive force from concentrating on the heat exchanger tubes 20.
  • the fin bent portion 42 has a shape in which the plate portion 41 of the fin 40A is bent into a V shape, and the tip of the V shape is directed downward. Therefore, the fin bent portion 42 can collect water droplets adhering to the plate portion 41 at the tip of the V-shape and drain water with high efficiency.
  • the fin bent portion 42 maintains the V-shaped shape of the plate portion 41 even if compressive force is applied during the bending process. Therefore, in the fin 40A, the ventilation resistance is less likely to increase compared to the case where the fin 30 is irregularly deformed due to the compressive force of the bending process. As a result, the fins 40A can maintain the ventilation resistance within a certain range and suppress a decrease in the heat exchange efficiency of the heat exchanger 1A.
  • FIG. 8 shows a heat exchanger tube 20 deformed into such a shape.
  • FIG. 8 is an enlarged rear view of a part of the heat exchanger 1A when the heat exchanger tubes 20 included in the modified example of the heat exchanger 1A according to the first embodiment are bent. Note that FIG. 8 shows the straight portions 17 and 18 of the headers 11 and 12 of the heat exchanger 1A viewed from the inside of the bend after being bent.
  • this phenomenon in which the heat transfer tube 20 bends is a phenomenon that occurs when a straight tube-shaped header is bent evenly by supporting both sides sandwiching the center in the longitudinal direction and applying a load to the center in the longitudinal direction.
  • the heat exchanger tube 20 in the straight portions 17 and 18 on both sides of the bent portions 15 and 16 may be bent.
  • the heat exchanger tube 20 in the straight portions 17 and 18 on both sides may be bent.
  • the straight portions 17 and 18 of the heat exchanger tube 20 located in the direction in which the clamp used in this method rotates do not bend, and the straight portions 20 located on the opposite side to the direction in which the clamp rotates.
  • the heat exchanger tubes 20 17 and 18 will be bent.
  • the heat exchanger tube 20 at such a position may be bent.
  • the rotary drawing bending method means that a part of the straight tubular headers 21 and 22 is sandwiched between a clamp and a cylindrical bending die, and the clamp is moved to the center of the bending die by moving the clamp in the circumferential direction of the bending die. This is a method of forming bent portions 15 and 16 by rotating around an axis.
  • the heat transfer tube 20 in one of the straight parts 17 and 18 connected to the bent parts 15 and 16 has a bent shape, and the other straight part 17 with the bent parts 15 and 16 in between becomes a bent shape. , 18 have a shape that does not bend.
  • the heat exchanger tube 20 may be deformed into such a shape.
  • the low-strength portion of each plate-like portion 41 of the fin 40A is formed by the fin bent portion 42.
  • the low strength portion is not limited to this.
  • the low-strength portion may be any portion as long as it has lower rigidity than other portions of the plate-like portion 41 and is more easily deformed than other portions when the distance between adjacent heat exchanger tubes 20 changes.
  • the low strength portion of each of the plate portions 41 is formed by a portion of each of the plate portions 41 including a notch portion cut inward from the end surface. There is.
  • the configuration of the heat exchanger 1B will be described below with reference to FIG. Embodiment 2 will mainly be described with respect to configurations that are different from Embodiment 1.
  • FIG. 9 is an enlarged perspective view of a portion of the heat exchanger tubes 20 and fins 40B included in the heat exchanger 1B according to the second embodiment.
  • FIG. 9 shows the heat exchanger tube 20 connected to the bending parts 15 and 16 of the headers 11 and 12, and the fin 40B attached to the heat exchanger tube 20 similarly to FIG. Further, the fins 40B are deformed by the compressive force applied during the bending process, but for ease of understanding, FIG. 9 shows the fins 40B hardly deformed.
  • the low-strength portion is formed by a portion of the plate-shaped portion 41 including a notch portion 43 shown in FIG. 9 that cuts into the end surface. That is, the low-strength portion is formed by the cut portion 43 and the peripheral portion of the cut portion 43 of the plate-like portion 41 .
  • the cut portion 43 cuts into the plate portion 41 from the end surface of the back side B of the plate portion 41 toward the inside of the plate portion 41.
  • the notch portion 43 penetrates the plate-like portion 41.
  • the cut portion 43 is formed in the shape of a wedge with the tip facing inside the plate-like portion 41 . That is, the cut portion 43 has its apex located inside the plate portion 41 when viewed from a direction perpendicular to the plate surface of the plate portion 41, and the opposite side to the apex is located at the end surface of the plate portion 41. It is formed in the shape of a triangle.
  • the cut portion 43 when the plate portion 41 is viewed from a direction perpendicular to the plate surface, the cut portion 43 has its bottom facing toward the inside of the bent portions 15 and 16 shown in FIG. 1, that is, toward the back side. It is formed into an isosceles triangle facing B. The compressive force applied in the bending process becomes larger toward the back side B than the neutral plane.
  • the cut portion 43 enables the fin 40B to deform in accordance with the compressive force.
  • the notches 43 are deformed by the compressive force of the bending process, making it difficult for compressive force to be applied to the heat exchanger tubes 20 .
  • the cut portion 43 has the above-described shape, even if it is deformed by compressive force, the end face portions of the cut portion 43 of the plate-like portion 41 are unlikely to overlap or protrude. As a result, the ventilation resistance of the cut portion 43 is unlikely to increase.
  • the cut portion 43 cuts the plate-like portion 41 into the above-described shape. That is, the cut portion 43 completely cuts out the plate-like portion 41 in the thickness direction. As a result, the notches 43 facilitate deformation of the fins 40B due to the compressive force applied during the bending process.
  • a cut refers to a shape in which a cut is made from the end surface of the plate-shaped portion 41 toward the inside. Therefore, the notch portion 43 is also referred to as a notch portion.
  • the method for manufacturing the heat exchanger 1B includes (1) manufacturing the fins 40B in the same manner as the manufacturing of the fins 30 in step S1 described in Embodiment 1, and (2) manufacturing the fins 40B by, for example, , according to the first embodiment, except that the cut portion 43 is formed by press working at the same time as the fin 40B is formed, and (3) as a result, step S3 described in the first embodiment is omitted.
  • the method for manufacturing the heat exchanger 1A is the same. Therefore, the explanation thereof will be omitted. Note that the cut portion 43 has a triangular shape because the plate portion 41 is punched out by press working.
  • the cut portion 43 described above is an example of a first cut portion as referred to in the present disclosure.
  • the end surface of the back side B of the plate-like part 41 in which the notch part 43 is formed is the end face of the plate-like part 41 facing the bending inner side of the first bending part in the present disclosure, and the end face of the plate-like part 41 in the present disclosure. This is an example of one of the end faces facing the outside of the bend.
  • Fin 40B is an example of a first fin in the present disclosure.
  • the shape of the cut portion 43 may be called a V-shape.
  • the cut portion 43 is formed in the plate portion 41 of the fin 40B, and a portion of the plate portion 41 including the cut portion 43 functions as a low-strength portion. do.
  • a portion of the plate portion 41 including the cut portion 43 deforms before the other portion of the plate portion 41.
  • the heat exchanger 1B can suppress deformation of the heat exchanger tubes 20.
  • the cut portions 43 can be formed at the same time as the fins 40B, for example, by press working. Therefore, it can be manufactured with the same number of man-hours as a normal heat exchanger without the notches 43 in the fins.
  • the cut portion 43 has a triangular shape, but the cut portion 43 is not limited to this.
  • the cut portion 43 is such that a portion of the plate portion 41 including the cut portion 43 has lower rigidity than other portions of the plate portion 41, and when the gap between adjacent heat exchanger tubes 20 changes, the portion of the plate portion 41 that includes the cut portion 43 is It only needs to be easier to deform than other parts.
  • the shape of the cut portion 43 is arbitrary as far as it is concerned.
  • FIG. 10 is a partially enlarged perspective view of a modification of the heat exchanger 1B according to the second embodiment.
  • FIG. 11 is a partially enlarged perspective view of another modification of the heat exchanger 1B according to the second embodiment.
  • FIG. 10 and FIG. 11 have shown the same part as the part shown in FIG. 9 of the heat exchanger 1B.
  • the cut portion 43 may have a rectangular shape. Specifically, the cut portion 43 may have a rectangular shape in which the plate portion 41 is cut from the end face of the back side B to the front side F, and the longitudinal direction is directed toward the front side. In other words, the notch portion 43 may have an I-shape with the longitudinal direction facing the front direction.
  • the width of the notch 43 in the transverse direction is preferably smaller than the base of the isosceles triangle of the notch 43 described in the second embodiment. This is because, with such a configuration, the area of the plate portion 41 cut out can be made smaller than in the case of the second embodiment, and the heat exchange performance of the fins 40B can be improved as much as possible.
  • the cut portion 43 may be semicircular.
  • the notch portion 43 may have a semicircular shape having a center on the end surface side of the plate-like portion 41 and a convex arc directed toward the inside of the plate-like portion 41 .
  • the semicircular arc may be a perfect circular arc or an elliptical arc.
  • the form shown in FIG. 11 may be applied to the second embodiment or the form shown in FIG. 10. That is, the interior angles of the triangular or rectangular cut portion 43 may be rounded into a semicircular shape. In this case, it is preferable that the semicircular arc corresponds to the angle of the interior angle.
  • the second embodiment the embodiments shown in FIGS. 10 and 11 may be applied to the first embodiment. That is, the cut portion 43 may be formed in the fin bent portion 42.
  • the low-strength portions of each of the plate-like portions 41 of the fins 40A are formed by the fin bent portions 42. Further, in the second embodiment, the low-strength portion is formed by a portion of the plate-like portion 41 including the notch portion 43 .
  • the low strength portions are not limited to these. As described in Embodiment 2, the low-strength portion has lower rigidity than other portions of the plate-shaped portion 41 and is more easily deformed than other portions when the distance between adjacent heat exchanger tubes 20 changes. Any part is fine.
  • each of the plate portions 41 has a low strength portion formed by a thin wall portion.
  • the configuration of the heat exchanger 1C will be described with reference to FIG. 12.
  • Embodiment 3 will mainly be described with a focus on configurations that are different from Embodiments 1 and 2.
  • FIG. 12 is an enlarged perspective view of a portion of the heat exchanger tubes 20 and fins 40C included in the heat exchanger 1C according to the third embodiment.
  • FIG. 12 shows a heat exchanger tube 20 connected to the bent portions 15 and 16 of the headers 11 and 12, and a fin 40C attached to the heat exchanger tube 20.
  • FIG. 12 shows the fin 40C with almost no deformation for ease of understanding, similar to FIG. 9.
  • the low strength portion is formed by a thin wall portion 44 that is thinner than the other portions of the plate portion 41.
  • the thin wall portion 44 is a triangular shape whose vertex is located inside the plate portion 41 and the opposite side to the vertex is located at the end surface of the plate portion 41 when viewed from a direction perpendicular to the plate surface of the plate portion 41. formed into a shape. That is, the thin portion 44 is formed to have the same planar shape as the cut portion 43 described with reference to FIG. 9 . As a result, the outer shape of the thin portion 44 when the plate portion 41 is viewed from a direction perpendicular to the plate surface of the plate portion 41 is similar to the notch portion 43 shown in FIG. 9 . Therefore, a detailed description of the outer shape of the thin portion 44 will be omitted. By having such a shape, the thin wall portion 44 is deformed by the compressive force of the bending process, thereby making it difficult for the compressive force to be applied to the heat exchanger tube 20 .
  • the thin portion 44 is thinner than the other portions of the plate portion 41. Further, the thickness of the thin portion 44 is constant. Unlike the cut portion 43 described in the second embodiment, the thin wall portion 44 transmits the heat of the heat exchanger tube 20, and as a result, contributes to heat exchange. As a result, the fins 40C have higher heat exchange efficiency than the fins 40B described in the second embodiment.
  • the thin portion 44 may be embossed on one surface of the plate portion 41.
  • the direction in which the thin portion 44 protrudes is in the direction of gravity, that is, downward.
  • the thin parts 44 that are symmetrical in the X direction are vertically adjacent to each other, but the thin parts 44 having the same shape may be vertically adjacent to each other.
  • the method for manufacturing the heat exchanger 1C is as follows: (1) In step S1 described in Embodiment 1, the fins 40C are manufactured in the same manner as the fins 30, and at that time, the fins 40C are formed by, for example, press working.
  • the thin portion 44 described above is an example of a first thin portion as referred to in the present disclosure.
  • the end surface of the back side B of the plate-like part 41 in which the thin-walled part 44 is formed is the end face of the plate-like part 41 facing the bending inner side of the first bending part and the end face of the plate-like part 41 in the present disclosure. This is an example of one of the end faces facing the outside of the bend.
  • the fin 40C is an example of a first fin in the present disclosure.
  • the fins 40C include the thin portions 44 that are low strength portions.
  • the thin wall portion 44 deforms before the other portions of the plate-like portion 41. This makes it difficult for compressive force to concentrate on the heat exchanger tubes 20.
  • the heat exchanger 1C can suppress deformation of the heat exchanger tubes 20.
  • the thin portion 44 can be formed together with the fins 40C by, for example, press working, as in the second embodiment. Therefore, the heat exchanger 1C can be manufactured with the same number of man-hours as a normal heat exchanger in which the fins do not have the thin-walled portions 44.
  • the thin wall portion 44 has a triangular shape in plan view, but the thin wall portion 44 is not limited to this.
  • the shape of the thin portion 44 is arbitrary as long as it satisfies the condition of the low strength portion.
  • FIG. 13 is a partially enlarged perspective view of a modification of the heat exchanger 1C according to the third embodiment. Note that FIG. 13 shows the same portion of the heat exchanger 1C as shown in FIG. 12.
  • the thin portion 44 may have a semicircular shape. Specifically, the thin portion 44 has a semicircular shape with the center on the end surface side of the plate-like portion 41 and a convex arc directed toward the inside of the plate-like portion 41, similar to the form shown in FIG. It's okay. With such a configuration, stress concentration during the bending process can be prevented, similar to the configuration shown in FIG. 11. Also in this form, the semicircular arc may be an elliptical arc.
  • the thin wall portion 44 of the third embodiment may be applied to the fin bent portion 42 of the fin 40A described in the first embodiment.
  • the fin bent portion 42 has an isosceles triangular shape with its base facing the end surface of the back side B of the plate portion 41 when the plate portion 41 is viewed from a direction perpendicular to the plate surface.
  • the triangular shaped portion may be a thin portion 44 that is thinner than other portions of the plate portion 41. This is because such a thin wall portion 44 is easier to bend, so that the fin bent portion 42 is easily deformed.
  • the cut portion 43 is formed on the end surface of the plate-like portion 41 that faces the inside of the bend.
  • the form having the cut portion 43 is not limited to this.
  • a notch portion may be formed in another portion of the plate-like portion 41.
  • cut portions 45 and 46 are formed in each of the plate portions 41.
  • the configuration of the heat exchanger 1D will be described below with reference to FIG. 14.
  • Embodiment 4 will mainly be explained with a different configuration from Embodiments 1-3.
  • FIG. 14 is an enlarged cross-sectional view of a portion of the fins 40D included in the heat exchanger 1D according to the fourth embodiment. Note that the fins 40D shown in FIG. 14 are fins attached to the bent portions 15 and 16 of the headers 11 and 12 included in the heat exchanger 1D, but for ease of understanding, the headers 11 and 12 are bent during the bending process. The fin 40D is shown in an undeformed state before being deformed.
  • the plate portion 41 of the fin 40D has a notch 45 corresponding to the notch 43 of the second embodiment, and a notch 45 disposed at a different position from the notch 45.
  • a notch portion 46 is formed. These cut portions 45 and 46 both correspond to the low strength portions described in Embodiment 1-3.
  • the notch portion 45 is formed on the end surface of the plate-shaped portion 41 facing the back side B, as in the second embodiment.
  • the shape of the notch portion 45 is a rectangle in which the plate-like portion 41 is cut from the end face of the back side B to the front side F, and the longitudinal direction is directed toward the front side, similarly to the notch portion 43 according to the modification of the second embodiment. It has the shape of The tip of the notch 45 on the front side F is rounded into a semicircular shape.
  • the notch portion 45 is formed on the end face facing the back side B of the plate-like portion 41, and has such a shape, so that the plate-like portion 41 is bent by the compressive force of the bending process, similarly to the second embodiment. This makes it easier to deform the heat exchanger tubes 20, thereby making it difficult for compressive force to be applied to the heat exchanger tubes 20.
  • the notch portion 46 is formed on the end face facing the front side F of the plate-shaped portion 41. That is, the cut portion 46 is formed on the end surface of the plate-shaped portion 41 opposite to the end surface where the cut portion 45 is formed.
  • the cut portion 46 has a shape obtained by inverting the cut portion 45 in the front direction. In other words, the cut portion 46 has a shape symmetrical to the cut portion 45 with respect to the line L1 indicating the neutral plane.
  • Heat exchanger 1D is manufactured by steps S1, S2, and S4, excluding step S3, described in the second embodiment.
  • step S2 when each of the fins 40B is sandwiched between the heat exchanger tubes 20, the end faces of the fins 40B on which the cut portions 43 are formed are aligned in the same direction.
  • the cut portions 45 and 46 are formed on each of the two opposing surfaces of the plate-shaped portion 41, so that the fin 40D is The end faces on which the notches 45 are formed do not have to be aligned in the same direction.
  • the end surface where the notch 45 is formed and the end surface where the notch 46 is formed may be oriented in the same direction.
  • step S4 of the method for manufacturing the heat exchanger 1D a compressive force is applied to the end face of the plate-like part 41 facing the inside of the bend, and the plate-like part 41 is bent.
  • a tensile force is applied to the end face facing the outside of the bend.
  • a notch 45 is provided on the end surface of the plate-shaped portion 41 facing the inside of the bend, and a notch 46 is provided on the end surface of the plate-like portion 41 facing the outside of the bend. .
  • step S4 when the semi-finished heat exchanger 2 is bent in step S4, the plate portion 41 is deformed into a state in which the notches 45 are compressed and the notches 46 are stretched. Thereby, according to the method for manufacturing the heat exchanger 1D, compressive force and tensile force are hardly applied to the heat exchanger tubes 20. As a result, deformation of the heat exchanger tubes 20 is suppressed. Further, it is possible to suppress a decrease in the heat exchange efficiency of the heat exchanger 1D.
  • the above-mentioned notches 45 and 46 are examples of the first notch and the second notch in the present disclosure.
  • the end face facing the back side B of the plate-like part 41 in which the notch part 45 is formed is the same as the end face facing the bending inner side of the first bending part of the plate-like part 41 as referred to in the present disclosure.
  • the end face facing the front side F of the plate-like part 41 in which the notch part 46 is formed is the end face facing the bending inner side of the first bent part of the plate-like part 41 in the present disclosure, and the end face of the first bent part of the plate-like part 41 in the present disclosure.
  • each of the plate portions 41 of the fins 40D includes the notches 45 and the notches 46 having a shape and arrangement symmetrical to the notches 46. is provided.
  • the direction of the fins 40D can be reversed to assemble the heat exchanger 1D.
  • the work of aligning the orientations of the fins 40D can be omitted, and assembly efficiency can be improved.
  • the cut portions 45 and 46 have a rectangular shape.
  • the shapes of the notches 45 and 46 are not limited to this.
  • the shape of the cut portions 45 and 46 may satisfy the conditions of a low strength portion for the same reason as explained in the second embodiment.
  • the shapes of the notches 45 and 46 may be symmetrical with respect to the neutral plane.
  • the notches 45 and 46 may have the triangular or semicircular shapes described in the second embodiment and the modification of the second embodiment.
  • Embodiment 4 describes a case where the low-strength portions are the notches 45 and 46
  • Embodiment 4 is also applicable to the case where the low-strength portion is the thin-walled portion 44.
  • the cut portion 45 may be replaced with a thin wall portion 44
  • the cut portion 46 may be replaced with a thin wall portion 44 that is symmetrical with respect to the neutral plane.
  • the thin wall portion 44 that is symmetrical with respect to the neutral plane in this case is an example of the second thin wall portion as referred to in the present disclosure.
  • Embodiment 4 can also be applied when the low strength portion is the fin bent portion 42.
  • the cut portion 45 may be replaced with a fin bent portion 42
  • the cut portion 46 may be replaced with a fin bent portion 42 that is symmetrical with respect to the neutral plane.
  • the low-strength portions of each of the plate-like portions 41 of the fins 40A are formed by the fin bent portions 42. Furthermore, in the second embodiment, the low-strength portion is formed by a portion of the plate-like portion 41 including the notch portion 43 . In the third embodiment, the low strength portion is formed by the thin wall portion 44. However, the low strength portions are not limited to these. As described above, the low-strength portion only needs to be a portion that has lower rigidity than other portions of the plate-shaped portion 41 and is more easily deformed than other portions when the interval between adjacent heat exchanger tubes 20 changes. .
  • each of the plate-shaped portions 41 has a low-strength portion formed by a bending portion 47.
  • the configuration of the heat exchanger 1E will be described below with reference to FIG. 15.
  • Embodiment 5 will be mainly described with respect to configurations that are different from Embodiments 1-4.
  • FIG. 15 is an enlarged perspective view of a portion of the heat exchanger tubes 20 and fins 40E included in the heat exchanger 1E according to the fifth embodiment.
  • FIG. 15 shows a heat exchanger tube 20 connected to the bent portions 15 and 16 of the headers 11 and 12, and a fin 40E attached to the heat exchanger tube 20.
  • FIG. 15 shows the fins 40E that have not been deformed during the bending process for ease of understanding, similar to FIGS. It shows.
  • the low-strength portion is formed by a flexure portion 47 that is flexed more than the other portions of the plate-like portion 41.
  • the corrugated peak portions 401 and valley portions 402 of the fins 40E are brazed to the heat exchanger tubes 20.
  • Two bending portions 47 are provided in each of the peak portions 401 and the valley portions 402, sandwiching the brazing locations between the peak portions 401 and the valley portions 402.
  • the widths W1 and W2 of the corrugated peak portion 401 and the valley portion 402 are made larger than half the wavelength L2 of the corrugated shape.
  • the bending portion 47 is provided on the back side B in FIG. 15, this bending portion 47 extends from the back side B to the front side F (not shown).
  • the flexible portion 47 is deformed by compressive force and tensile force during the bending process, thereby preventing damage to the fin 40E itself. Further, compressive force and tensile force are less likely to be applied to the heat exchanger tubes 20.
  • the manufacturing method of the heat exchanger 1E includes (1) manufacturing the fins 40E having the bending portions 47 in step S1 described in the first embodiment, and (2) as a result, manufacturing the fins 40E in step S3 described in the first embodiment.
  • the method for manufacturing heat exchanger 1A according to Embodiment 1 is the same except that . Therefore, the explanation thereof will be omitted.
  • the fins 40E include the flexible portions 47 that are low strength portions.
  • the flexible portion 47 deforms before the other portions of the plate-like portion 41. This makes it difficult for compressive force or tensile force to concentrate on the heat exchanger tubes 20. As a result, deformation of the heat exchanger tubes 20 is suppressed.
  • the plate-shaped portion 41 may be pulled beyond the allowable amount and damaged, but according to the heat exchanger 1E, since there is an elongation margin due to the flexible portion 47, the fin 40E and itself is not easily damaged.
  • fins 40A-40E each having a low-strength portion are attached to each of the heat transfer tubes 20 connected to the bent portions 15 and 16 of the headers 11 and 12.
  • the fins 40A to 40E are attached to all of the heat exchanger tubes 20 in the bent portions 15 and 16.
  • the heat exchangers 1A-1E are not limited to this. In the heat exchangers 1A-1E, it is sufficient that at least one of the fins attached to each of the heat transfer tubes 20 connected to the bent portions 15 and 16 has a low-strength portion. In short, at least one of the fins may be fins 40A-40E.
  • FIG. 16 is a developed view of a modification of the heat exchanger 1A according to the first embodiment.
  • FIG. 17 is a developed view of another modification of the heat exchanger 1A according to the first embodiment. Note that FIGS. 16 and 17 show a modified example of the heat exchanger 1A and another modified example of the heat exchanger 1A when the bent portions 15 and 16 are unfolded in a straight line. The portion corresponding to the folded portions 15 and 16 developed in a straight line is designated by the symbol P4.
  • fins 40A having a low-strength portion and fins 30 having no low-strength portion are arranged in the arrangement of the heat exchanger tubes 20. They may be arranged alternately in the direction. With this configuration, the fins 30, which are less likely to deform during the bending process than the fins 40A and, as a result, can easily maintain ventilation performance, are arranged in the bent portions 15 and 16, so that the ventilation performance of the heat exchanger 1A can be improved. can be increased.
  • fins 30 having no low-strength portions are continuously arranged in the direction in which the heat transfer tubes 20 are arranged in portions P4 of the headers 11 and 12 corresponding to the bent portions 15 and 16.
  • a plurality of fin groups may be formed.
  • the fins 40A may be arranged between the fin groups. As described above, the fins 30 are less deformed than the fins 40A during the bending process, and as a result of being less deformed, the ventilation performance is easily maintained. Therefore, compared to the case of the first embodiment, the ventilation performance of the heat exchanger 1A can be improved.
  • At least one fin 40A to 40E is disposed in the bent portions 15 and 16. This is because, in the heat exchangers 1A-1E, deformation of the heat exchanger tubes 20 can be suppressed and a decrease in heat exchange efficiency can be suppressed.
  • the low-strength portion is provided on the end surface of the plate portion 41 of the fin 40A that faces the inside of the bend.
  • the low-strength portion is preferably provided on at least one of the end surface of the plate-like portion 41 that faces the bent inner side of the bent portion 15 and the end surface that faces the bent outer side of the bent portion 15 . If a low-strength portion is provided at such a position, if the interval between heat exchanger tubes 20 changes during the bending process during the manufacturing of heat exchangers 1A-1D, for example, the distance between heat exchanger tubes 20 may change during the bending process. This is because when the interval narrows or widens, it is possible to suppress the concentration of compressive force or tensile force on the heat exchanger tubes 20 due to preferential deformation of the low-strength portions.
  • the fins 40A-40E do not protrude beyond the heat exchanger tubes 20 toward the back side B, nor do they protrude beyond the heat exchanger tubes 20 toward the front side F.
  • the shapes of the fins 40A-40E are not limited to this.
  • the fins 40A-40E may protrude further toward the back side B than the heat exchanger tubes 20.
  • the fins 40A-40E may protrude further toward the front side F than the heat exchanger tubes 20.
  • FIG. 18 is a sectional view of yet another modification of the fins 40A included in the heat exchanger 1A according to the first embodiment. Note that FIG. 18 shows a cross section of a modified example of the heat exchanger tube 20 and the fins 40A located at positions overlapping the bent portions 15 and 16 in the vertical direction. In addition, hatching is omitted for ease of understanding.
  • the fins 40A may protrude further toward the front side F than the tips located on the front side F of the flat cross-sectional view of the heat exchanger tube 20. That is, it may protrude outward from the bending portions 15 and 16.
  • the front side F of the fin 40A shown in FIG. 18 corresponds to the outside of the bend, and is the side into which outside air flows when the outdoor unit performs heating operation. Therefore, the front side F portion of the fin 40A is easily frosted.
  • the fins 40A increase the area where frost is likely to adhere, thereby suppressing deterioration of heat exchange performance.
  • the fin 40A increases the heat transfer area and improves the heat exchange performance.
  • the fins 40A may protrude further toward the back side B than the base end on the back side B of the flat cross-sectional view of the heat exchanger tube 20. That is, it may protrude to the inside of the bent portions 15 and 16.
  • the distance D1 that the fin 40A projects may be, for example, the same as the distance D2 that the fin 40A projects toward the front side F, or may be shorter than the distance D2.
  • the fins 40A protrude toward both the outside and inside of the bent portions 15 and 16; It is best to protrude toward the side.
  • the fins 30 and fins 40A-40E are corrugated.
  • the fins 30 and fins 40A-40E are not limited thereto.
  • the fins 30 and the fins 40A to 40E may be provided between adjacent heat exchanger tubes 20 and transmit the heat of the heat exchanger tubes 20.
  • the heat exchanger tube 20 is a flat tube, but the heat exchanger tube 20 is not limited to this.
  • the heat exchanger tube 20 may be any tube that connects at least the bent portions 15 and 16. Therefore, the heat exchanger tube 20 may be, for example, a circular tube.
  • Embodiment 1-5 describes an example in which the heat exchangers 1A-1E are incorporated into an outdoor unit of an air conditioner, the heat exchangers 1A-1E are not limited to this.
  • the heat exchangers 1A-1E are applicable to all devices and devices that require heat exchange.
  • the heat exchanger 1A may be incorporated into an indoor unit of an air conditioner.

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PCT/JP2023/010041 2022-03-17 2023-03-15 熱交換器および熱交換器の製造方法 Ceased WO2023176874A1 (ja)

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DE112023001430.2T DE112023001430T5 (de) 2022-03-17 2023-03-15 Wärmetauscher und Verfahren zum Herstellen eines Wärmetauschers
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