WO2021145036A1 - 熱交換器の製造方法 - Google Patents

熱交換器の製造方法 Download PDF

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Publication number
WO2021145036A1
WO2021145036A1 PCT/JP2020/038863 JP2020038863W WO2021145036A1 WO 2021145036 A1 WO2021145036 A1 WO 2021145036A1 JP 2020038863 W JP2020038863 W JP 2020038863W WO 2021145036 A1 WO2021145036 A1 WO 2021145036A1
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WO
WIPO (PCT)
Prior art keywords
heat exchanger
brazing
winding
refrigerant distributor
flat tubes
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/JP2020/038863
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English (en)
French (fr)
Japanese (ja)
Inventor
暢洋 木下
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 JP2021570648A priority Critical patent/JP7186903B2/ja
Publication of WO2021145036A1 publication Critical patent/WO2021145036A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • B23K1/14—Soldering, e.g. brazing, or unsoldering specially adapted for soldering seams
    • B23K1/18—Soldering, e.g. brazing, or unsoldering specially adapted for soldering seams circumferential seams, e.g. of shells
    • 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
    • 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

Definitions

  • This disclosure relates to a method of manufacturing a heat exchanger.
  • Patent Document 1 discloses a brazing member in which a plurality of insertion portions sandwiching a flat tube are connected by a connecting portion. That is, the brazing member of Patent Document 1 is collectively attached to a plurality of flat pipes inserted into the openings of the refrigerant distributor. Patent Document 1 is intended to improve the efficiency of brazing work in a heat exchanger in this way.
  • the portion of the connecting portion located substantially in the center of each insertion portion drops without joining the refrigerant distributor and the flat pipe. Therefore, a part of the brazing member is not used for joining the refrigerant distributor and the flat pipe, and is wasted. Further, since the connecting portion is omitted and one brazing member consisting of only the insertion portion is attached to each of the flat pipes, the entire amount is used for joining the refrigerant distributor and the flat pipe. In general, such a brazing member may be manufactured so as to have a U-shape that sandwiches a flat tube by bending a brazing member that has been linear.
  • the present disclosure has been made to solve the above-mentioned problems, and provides a method for manufacturing a heat exchanger that suppresses the occurrence of poor bonding between the refrigerant distributor and the flat pipe.
  • the method for manufacturing a heat exchanger is a method for manufacturing a heat exchanger including a plurality of flat tubes and a refrigerant distributor having a plurality of insertion openings into which the plurality of flat tubes are inserted.
  • a step of forming a winding portion by winding between a first end portion and a second end portion of a plurality of linear brazing members, and an end portion of a plurality of flat tubes are formed between the winding portion and the first portion.
  • the step of sandwiching the first sandwiching portion between the end portion of the pipe and the second sandwiching portion between the winding portion and the second end portion, and the end portions of the plurality of flat pipes are distributed as a refrigerant. It has a step of inserting into each of a plurality of insertion openings of the vessel, and a step of melting the plurality of brazing members and joining the plurality of flat pipes and the refrigerant distributor.
  • the brazing member is urged to sandwich the flat tube. Therefore, the brazing member is in contact with and fixed to the flat tube. Therefore, according to the method for manufacturing the heat exchanger of the present disclosure, since the brazing member is hard to come off from the flat tube during brazing, the occurrence of poor joining is suppressed.
  • FIG. It is a perspective view which shows the heat exchange part 34 which concerns on Embodiment 1.
  • FIG. It is a figure for demonstrating the flux application method which concerns on Embodiment 1.
  • FIG. It is a perspective view which shows the flat tube 33 and brazing member 50 which concerns on Embodiment 1.
  • FIG. It is a figure for demonstrating the connection method of the flat tube 33 and the refrigerant distributor 31 which concerns on Embodiment 1.
  • FIG. It is a side view which shows the flat tube 33, the brazing member 50, and the refrigerant distributor 31 which concerns on Embodiment 1.
  • FIG. It is a figure for demonstrating the joining method of the flat tube 33 and the refrigerant distributor 31 which concerns on Embodiment 1.
  • FIG. It is a figure for demonstrating the bending process of the heat exchange part 34 which concerns on Embodiment 1.
  • FIG. It is a perspective view which shows the outdoor heat exchanger 8 which concerns on Embodiment 1.
  • FIG. It is a flowchart which shows the manufacturing method of the outdoor heat exchanger 8 which concerns on Embodiment 2.
  • FIG. It is a side view of the brazing member 150 which concerns on Embodiment 2.
  • FIG. It is a perspective view of the brazing member 150 which concerns on Embodiment 2.
  • FIG. It is a figure for demonstrating the fixed state of the brazing member 150 which concerns on Embodiment 2.
  • FIG. It is a perspective view which shows the brazing member 250 which concerns on the modification 1 of Embodiment 1.
  • FIG. 2 It is a perspective view which shows the refrigerant distributor 331 which concerns on the modification 2 of Embodiment 1.
  • FIG. It is a figure for demonstrating the assembly of the flat tube 33 and the refrigerant distributor 31 which concerns on Embodiment 1.
  • FIG. It is a side view which shows the brazing member 450 which concerns on the modification 1 of Embodiment 2.
  • FIG. It is a perspective view which shows the brazing member 450 which concerns on the modification 1 of Embodiment 2.
  • FIG. 1 is a circuit diagram showing an air conditioner 1 according to the first embodiment.
  • the air conditioner 1 will be described with reference to FIG.
  • the air conditioner 1 has an outdoor unit 2, an indoor unit 3, and a refrigerant pipe 4.
  • one indoor unit 3 is illustrated in FIG. 1, the number of indoor units 3 may be two or more.
  • the outdoor unit 2 includes a compressor 6, a flow path switching device 7, an outdoor heat exchanger 8, an outdoor blower 9, an expansion unit 10, and a receiver 11.
  • the indoor unit 3 has an indoor heat exchanger 21 and an indoor blower 22.
  • the refrigerant pipe 4 connects the compressor 6, the flow path switching device 7, the outdoor heat exchanger 8, the expansion unit 10, the receiver 11, and the indoor heat exchanger 21.
  • the refrigerant pipe 4 and each device connected to the refrigerant pipe 4 constitute a refrigerant circuit 5.
  • the compressor 6 sucks in the refrigerant in a low temperature and low pressure state, compresses the sucked refrigerant into a refrigerant in a high temperature and high pressure state, and discharges the refrigerant.
  • the compressor 6 is, for example, an inverter compressor driven by a motor (not shown) whose frequency is controlled by an inverter (not shown).
  • the flow path switching device 7 switches the flow direction of the refrigerant in the refrigerant circuit 5, and is, for example, a four-way valve.
  • the flow path switching device 7 connects the discharge side of the compressor 6 and the outdoor heat exchanger 8 and the suction side of the compressor 6 and the indoor heat exchanger 21 during the cooling operation. Further, the flow path switching device 7 connects the discharge side of the compressor 6 and the indoor heat exchanger 21 and the suction side of the compressor 6 and the outdoor heat exchanger 8 during the heating operation. ..
  • the flow path switching device 7 may have the same function as the four-way valve by combining a plurality of two-way valves instead of the four-way valve.
  • the outdoor heat exchanger 8 exchanges heat between the refrigerant and the outdoor air, and is, for example, a fin-and-tube heat exchanger.
  • the outdoor heat exchanger 8 acts as a condenser during the cooling operation and as an evaporator during the heating operation.
  • the outdoor blower 9 is a device that sends outdoor air to the outdoor heat exchanger 8, for example, a propeller fan.
  • the expansion unit 10 is a pressure reducing valve or an expansion valve that decompresses and expands the refrigerant.
  • the receiver 11 has a substantially cylindrical shape, and is a container for storing excess refrigerant in the refrigerant circuit 5 that increases or decreases according to the load fluctuation of the air conditioner 1.
  • the receiver 11 may be provided not in the outdoor unit 2 but in the indoor unit 3, or may be provided in a device different from the outdoor unit 2 and the indoor unit 3.
  • the indoor heat exchanger 21 exchanges heat between the indoor air and the refrigerant.
  • the indoor heat exchanger 21 acts as an evaporator during the cooling operation and as a condenser during the heating operation.
  • the indoor blower 22 is a device that sends indoor air to the indoor heat exchanger 21, and is, for example, a cross flow fan.
  • the liquid-state refrigerant flows into the expansion unit 10 and is depressurized and expanded to become a low-temperature and low-pressure gas-liquid two-phase state refrigerant.
  • the gas-liquid two-phase state refrigerant flows into the indoor heat exchanger 21 that acts as an evaporator.
  • the refrigerant flowing into the indoor heat exchanger 21 exchanges heat with the indoor air sent by the indoor blower 22, evaporates and gasifies. At this time, in the indoor air passing through the evaporator, the gas phase portion is cooled. Further, about 1% to 2% of water vapor contained in the indoor air passing through the evaporator is condensed as the cooling progresses. The condensed water is discharged to the outside through a drain drain pipe (not shown). Therefore, the indoor air passing through the evaporator is cooled and becomes air having a small amount of water and low humidity. Cooling in the room is performed by blowing out the air having low humidity cooled in this way from the indoor unit 3. After that, the evaporated low-temperature and low-pressure gas-state refrigerant passes through the flow path switching device 7 and is sucked into the compressor 6.
  • Heating operation Next, the heating operation will be described.
  • the refrigerant sucked into the compressor 6 is compressed by the compressor 6 and discharged in a high-temperature and high-pressure gas state.
  • the high-temperature and high-pressure gas-state refrigerant discharged from the compressor 6 passes through the flow path switching device 7 and flows into the indoor heat exchanger 21 that acts as a condenser.
  • the refrigerant flowing into the indoor heat exchanger 21 exchanges heat with the indoor air sent by the indoor blower 22, condenses and liquefies. At that time, the indoor air is warmed and the indoor heating is performed.
  • the liquid-state refrigerant flows into the expansion unit 10 and is depressurized and expanded to become a low-temperature and low-pressure gas-liquid two-phase state refrigerant.
  • the gas-liquid two-phase refrigerant flows into the outdoor heat exchanger 8 that acts as an evaporator.
  • the refrigerant flowing into the outdoor heat exchanger 8 exchanges heat with the outdoor air sent by the outdoor blower 9, evaporates and gasifies. After that, the evaporated low-temperature and low-pressure gas-state refrigerant passes through the flow path switching device 7 and is sucked into the compressor 6.
  • FIG. 2 is a perspective view showing the outdoor unit 2 according to the first embodiment.
  • FIG. 2 shows a state in which the housing of the outdoor unit 2 is removed.
  • FIG. 3 is a perspective view showing the outdoor heat exchanger 8 according to the first embodiment.
  • the outdoor heat exchanger 8 has an L-shape.
  • the outdoor heat exchanger 8 has a plurality of refrigerant distributors 31, a plurality of fins 32, and a plurality of flat pipes 33.
  • the flat tube 33 is inserted so as to be orthogonal to the plurality of fins 32. Note that FIG. 3 shows only a part of the fins 32.
  • the end portion of the flat pipe 33 is joined to the refrigerant distributor 31.
  • the fin 32 and the flat tube 33 may be referred to as a heat exchange unit 34.
  • the heat exchange portion 34 is bent and has a curved portion 61.
  • FIG. 4 is a cross-sectional view showing the refrigerant distributor 31 according to the first embodiment.
  • the refrigerant distributor 31 is configured by stacking a plurality of plate-shaped members.
  • An inflow pipe 41 is connected to one side of the refrigerant distributor 31.
  • the inflow pipe 41 is a pipe connected to the refrigerant pipe 4 to allow the refrigerant to flow into the refrigerant distributor 31.
  • a branch path 42 is formed in each plate-shaped member.
  • the branch path 42 is an opening that penetrates the plate-shaped member.
  • the branch passage 42 is formed more in the plate-shaped member on the opposite side of the inflow pipe 41 of the refrigerant distributor 31 than in the plate-shaped member on the inflow pipe 41 side of the refrigerant distributor 31.
  • FIG. 5 is a perspective view showing the refrigerant distributor 31 according to the first embodiment.
  • the refrigerant distributor 31 is formed with a plurality of insertion openings 43 arranged side by side on the opposite side of the inflow pipe 41.
  • the insertion opening 43 is an opening into which the end portion of the flat tube 33 is inserted.
  • the refrigerant distributor 31 and the flat pipe 33 are assembled by inserting the end portion of one flat pipe 33 into each insertion opening 43.
  • the refrigerant distributor 31 distributes the refrigerant to the respective flat pipes 33 inserted in parallel.
  • the fin 32 is a flat plate-shaped member.
  • the surface portions of the fins 32 face the refrigerant distributor 31 and are arranged in parallel with each other at regular intervals.
  • the fin 32 is made of, for example, aluminum.
  • the fins 32 increase the heat transfer area and promote heat exchange between the outdoor air and the refrigerant flowing inside the flat tube 33.
  • the fin 32 may have another shape such as a corrugated fin formed in a wavy shape.
  • FIG. 6 is a perspective view showing the flat tube 33 according to the first embodiment.
  • FIG. 6 shows the flat tube 33 before the bending process is performed.
  • the outdoor heat exchanger 8 has a plurality of flat tubes 33.
  • the flat tube 33 is made of, for example, aluminum.
  • the flat tube 33 has a long length in the X direction and a short length in the Y direction.
  • the flat tube 33 has a Z direction as a width direction, that is, a plate thickness direction.
  • a plurality of flow holes 51 are formed so as to penetrate from one end surface to the other end surface in the X direction and through which the refrigerant flows.
  • the plurality of distribution holes 51 are arranged in the Y direction.
  • the flat tube 33 has a first surface 52 connected to one end surface and the other end surface, and a second surface 53 which is the back surface of the first surface 52.
  • the flat tube 33 before bending is used as a reference for the X direction, the Y direction, and the Z direction.
  • FIG. 7 is a side view showing the brazing member 50 according to the first embodiment.
  • the brazing member 50 is fixed to the end of the flat pipe 33 and is used for joining the flat pipe 33 and the refrigerant distributor 31.
  • the brazing member 50 is a member extending from the first end 81 to the second end 82.
  • the brazing member 50 is a machined linear member, and a winding portion 70 wound around a winding shaft S is formed between a first end portion 81 and a second end portion 82.
  • the winding portion 70 includes four ring-shaped portions 71 arranged in the axial direction of the winding shaft S.
  • the ring-shaped portion 71 is a portion around which the brazing member 50 makes one round.
  • the brazing member 50 is wound four times between the first end portion 81 and the second end portion 82.
  • the winding start and winding end of each ring-shaped portion 71 are located below the apex of the winding portion 70.
  • the space on the first end 81 side of the apex of the winding portion 70 is set as the first region, and the apex of the winding portion 70 is set.
  • the rotation direction at the apex of the winding portion 70 has the first end 81 as the start point and the second end 82 as the end point. At that time, the direction is from the second region to the first region.
  • the portion from the apex of the winding portion 70 to the first end 81 and the portion from the apex of the winding portion 70 to the second end 82 It intersects the part.
  • the portion between the winding portion 70 and the first end portion 81 is referred to as a first sandwiching portion 83.
  • the portion between the winding portion 70 and the second end portion 82 is referred to as a second sandwiching portion 84.
  • the first sandwiching portion 83 and the second sandwiching portion 84 extend so as to have a twisting relationship with respect to the winding shaft S.
  • the brazing member 50 is formed so that the winding portion 70 is urged in the rewinding direction.
  • the winding portion 70 is brazed so that the first sandwiching portion 83 and the second sandwiching portion 84 are brought closer to each other by the urging force in the rewinding direction of the winding portion 70 in a state where no external force is applied. It is formed by winding a member 50.
  • the brazing member 50 is attached to the flat tube 33, the flat tube 33 can be sandwiched between the first sandwiching portion 83 and the second sandwiching portion 84.
  • FIG. 8 is a flowchart showing a manufacturing method of the outdoor heat exchanger 8 according to the first embodiment.
  • a method of manufacturing the outdoor heat exchanger 8 having the bent portion 61 will be described with reference to FIG.
  • processing is performed so that the winding portion 70 is formed on the brazing member 50 (S1).
  • the winding portion 70 is formed, for example, by winding the brazing member 50 around a round bar-shaped member having a predetermined diameter.
  • FIG. 9 is a perspective view showing the heat exchange unit 34 according to the first embodiment.
  • FIG. 9 shows a flat plate-shaped heat exchange section 34 before bending.
  • FIG. 10 is a diagram for explaining a method of applying the flux F according to the first embodiment.
  • a roller 90 and a flux coating device 91 are used for applying the flux F.
  • Flux F is a white powder that decomposes an oxide film formed on the surface of an aluminum material.
  • the flux coating device 91 injects the flux F.
  • the heat exchange unit 34 before bending shown in FIG. 9 is placed on the roller 90 and is carried below the flux coating device 91 by the roller 90. As a result, the flux F is applied to the entire heat exchange section 34. Flux F also adheres to the exposed portion of the flat tube 33.
  • FIG. 11 is a perspective view showing the flat tube 33 and the brazing member 50 according to the first embodiment. Here, a method of fixing the brazing member 50 to the flat tube 33 will be described.
  • the space between the first end portion 81 and the second end portion 82 of the brazing member 50 is temporarily widened, and the first end portion 81 is provided.
  • the flat tube 33 is located between the and the second end 82. Then, by releasing the brazing member 50, the space between the first end portion 81 and the second end portion 82 is narrowed, and as shown in FIG. 11, the brazing member 50 is attached to the end portion of the flat tube 33. It is fixed. At this time, a plurality of ring-shaped portions 71 are lined up in the X direction, that is, in the elongated direction of the flat tube 33.
  • FIG. 12 is a diagram for explaining a method of connecting the flat pipe 33 and the refrigerant distributor 31 according to the first embodiment.
  • FIG. 13 is a side view showing the flat pipe 33, the brazing member 50, and the refrigerant distributor 31 according to the first embodiment.
  • FIG. 13 is a view of the assembled flat pipe 33 and the refrigerant distributor 31 as viewed from the Z direction.
  • the ends of the plurality of flat tubes 33 are inserted into the plurality of insertion openings 43 of the refrigerant distributor 31.
  • the plurality of flat tubes 33 are inserted into the plurality of insertion openings 43 so that no gap is formed between the brazing member 50 and the refrigerant distributor 31.
  • the refrigerant distributor 31 and the plurality of flat pipes 33 are connected.
  • FIG. 14 is a diagram for explaining a method of joining the flat pipe 33 and the refrigerant distributor 31 according to the first embodiment.
  • a roller 90 and a brazing furnace 92 are used for joining the flat pipe 33 and the refrigerant distributor 31.
  • the brazing furnace 92 is set to a high temperature at which the inside of the furnace melts the brazing member 50.
  • the heat exchange unit 34 and the refrigerant distributor 31 are placed on the roller 90 and carried into the inside of the brazing furnace 92 to be heated.
  • the brazing member 50 is melted, and the flat pipe 33 and the refrigerant distributor 31 are joined.
  • the heat exchange unit 34 and the refrigerant distributor 31 are placed on the roller 90 so that the Y direction, that is, the direction in which the communication holes are lined up is the vertical direction. That is, the winding portion 70 is located above the first sandwiching portion 83 and the second sandwiching portion 84. As a result, the molten winding portion 70 hangs downward.
  • FIG. 15 is a diagram for explaining the bending process of the heat exchange unit 34 according to the first embodiment.
  • FIG. 16 is a perspective view showing the outdoor heat exchanger 8 according to the first embodiment.
  • a bending device 93 is used for bending the heat exchange unit 34.
  • the heat exchange unit 34 is first placed on the table 94 of the bending device 93.
  • the heat exchange portion 34 is bent by 90 ° by applying a force to the other end portion while one end portion is fixed to the fixing portion 95 of the bending device 93. That is, the heat exchange unit 34 has a shape bent from the X direction to the Z direction. In this way, the bent portion 61 is formed in the heat exchange portion 34.
  • the outdoor heat exchanger 8 is manufactured through the steps S1 to S6.
  • the brazing member 50 is urged so as to sandwich the flat tube 33. Therefore, the brazing member 50 is in contact with and fixed to the flat tube 33. Therefore, according to the method of manufacturing the outdoor heat exchanger 8 of the first embodiment, the brazing member 50 is hard to come off from the flat tube 33 at the time of brazing, so that the occurrence of poor joining is suppressed.
  • the winding portion 70 when the flat pipe 33 and the refrigerant distributor 31 are joined, the winding portion 70 is arranged so as to be above the first sandwiching portion 83 and the second sandwiching portion 84. Has been done. The upper part of the winding portion 70 is not in contact with the flat tube 33. However, when the brazing member 50 is melted, the winding portion 70 hangs down to a portion where the refrigerant distributor 31 and the flat pipe 33 are joined, and is used for joining the refrigerant distributor 31 and the flat pipe 33. .. That is, the winding portion 70 is used not only for sandwiching the flat pipe 33 between the first sandwiching portion 83 and the second sandwiching portion 84, but also for joining the refrigerant distributor 31 and the flat pipe 33. Therefore, according to the method of manufacturing the outdoor heat exchanger 8, it is possible to reduce the portion that is not used for joining the refrigerant distributor 31 and the flat pipe 33 and is wasted.
  • the winding portion 70 of the brazing member 50 has a plurality of ring-shaped portions 71 arranged in the X direction of the flat tube 33. Therefore, the portion where the brazing member 50 and the flat tube 33 come into contact with each other is larger than, for example, when the brazing member is U-shaped or when the ring-shaped portion is continuous in the Y direction. Therefore, since the brazing member 50 is stable when attached to the flat tube 33, it is difficult to fall off even when joining is performed in the brazing furnace 92.
  • FIG. 17 is a flowchart showing a manufacturing method of the outdoor heat exchanger 8 according to the second embodiment.
  • the second embodiment is different from the first embodiment in the processing method of the brazing member 150 and the procedure for fixing the brazing member 150 to the flat pipe 33.
  • the same parts as those in the first embodiment are designated by the same reference numerals, the description thereof will be omitted, and the differences from the first embodiment will be mainly described.
  • the ends of the plurality of flat tubes 33 are attached to the openings of the plurality of U-shaped brazing members 150 (S12), the first ends 181 and the second ends of the brazing members 150 are used.
  • the twisted portion 170 is formed by being twisted between the end portion 182 and the end portion 182.
  • the ends of the plurality of flat tubes 33 are the first sandwiching portion 183 between the twisted portion 170 and the first end portion 181 of the plurality of brazing members 150, and the twisted portions 170 and the second. It is sandwiched between the second sandwiching portion 184 and the end portion 182 of the (S13).
  • FIG. 18 is a side view of the brazing member 150 according to the second embodiment.
  • FIG. 19 is a perspective view of the brazing member 150 according to the second embodiment.
  • the brazing member 150 attached to the end of the flat tube 33 is twisted 180 ° at the top to form a twisted portion 170.
  • the twisted portion 170 is composed of one ring-shaped portion 171.
  • the ring-shaped portion 171 is a portion in which the brazing member 150 is half-twisted.
  • the twisting shaft T in FIGS. 18 and 19 is a rotation shaft of the twisted portion 170. Further, the twist shaft T extends in the Y direction, that is, in the direction in which the flow holes 51 are lined up.
  • the first sandwiching portion 183 and the second sandwiching portion 184 extend so as to be substantially parallel to the twist axis T.
  • FIG. 20 is a diagram for explaining a fixed state of the brazing member 150 according to the second embodiment.
  • the force applied to the twisted portion 170 propagates to the first sandwiched portion 183, so that the first sandwiched portion 183 is pressed against the first surface 52 of the flat tube 33 in the direction of arrow A.
  • the force applied to the twisting portion 170 propagates to the second sandwiching portion 184, so that the second sandwiching portion 184 is pressed against the second surface 53 of the flat tube 33 in the arrow B direction. That is, the brazing member 150 sandwiches the flat tube 33 between the first sandwiching portion 183 and the second sandwiching portion 184. As a result, the brazing member 150 comes into contact with and fixed to the flat tube 33.
  • steps S14 to S16 are performed in the same manner as in the first embodiment, detailed description thereof will be omitted. That is, following S13, a plurality of flat tubes 33 are assembled to the refrigerant distributor 31 (S14). Then, the brazing member 150 is melted in the brazing furnace 92, and the flat pipe 33 and the refrigerant distributor 31 are joined (S15). Finally, the heat exchanger 34 is bent to manufacture the outdoor heat exchanger 8 (S16).
  • the brazing member 150 is urged to sandwich the flat tube 33 by the manufacturing method of the outdoor heat exchanger 8 of the second embodiment. Therefore, the brazing member 150 is in contact with and fixed to the flat tube 33. Therefore, according to the method of manufacturing the outdoor heat exchanger 8 of the second embodiment, the brazing member 150 is hard to come off from the flat tube 33 at the time of brazing, so that the occurrence of poor joining is suppressed.
  • FIG. 21 is a perspective view showing the brazing member 250 according to the first modification of the first embodiment.
  • the winding portion 270 of the brazing member 250 is configured to include one ring-shaped portion 71. That is, the brazing member 250 is wound once.
  • the brazing member 250 according to the first modification of the first embodiment has the same appearance as the brazing member 250 in which the twisted portion 170 of the second embodiment is composed of one ring-shaped portion 71.
  • the number of ring-shaped portions 71 is appropriately adjusted from the amount of brazing members 250 required for joining the refrigerant distributor 31 and the flat pipe 33.
  • the lengths of the first sandwiching portion 83 and the second sandwiching portion 84, the wire diameter of the brazing member 250, and the like are also the brazing member 250 required for joining the refrigerant distributor 31 and the flat pipe 33. It is adjusted appropriately from the amount.
  • FIG. 22 is a perspective view showing the refrigerant distributor 331 according to the second modification of the first embodiment.
  • the insertion opening 343 of the refrigerant distributor 331 includes a long hole opening 397 and a circular opening 398.
  • the elongated hole opening 397 is an opening that is long in the Y direction when the flat tube 33 is inserted.
  • the circular opening 398 is connected to the elongated hole opening 397, has a diameter larger than the width of the elongated hole opening 397 in the lateral direction, and is a circular opening when viewed from the front. Further, the diameter of the circular opening 398 is larger than the width of the winding portion 70.
  • the insertion opening 343 of the second modification of the first embodiment may correspond to the brazing member 150 having the twisted portion 170 of the second embodiment.
  • FIG. 23 is a diagram for explaining the assembly of the flat pipe 33 and the refrigerant distributor 31 according to the first embodiment.
  • the order of the steps may be changed as appropriate.
  • the flat pipe 33 and the refrigerant distributor 31 may be assembled before the brazing member 50 is attached to the flat pipe 33.
  • the winding portion 70 may be formed at any time until the brazing member 50 is fixed to the flat tube 33.
  • the application of flux and the bending process of the heat exchange unit 34 may be omitted.
  • the winding portion 70 may be arranged so as to be below the first sandwiching portion 83 and the second sandwiching portion 84.
  • the brazing member 50 is urged to sandwich the flat tube 33. Therefore, the brazing member 50 is in contact with and fixed to the flat tube 33. Therefore, since the brazing member 50 is hard to come off from the flat tube 33 at the time of brazing, the occurrence of poor joining is suppressed.
  • brazing member 150 may be attached to the indoor heat exchanger 21 or another outdoor heat exchanger 8 instead of the outdoor heat exchanger 8. Further, the outdoor heat exchanger 8 to which the brazing member 150 is attached does not have to be used for the air conditioner 1.
  • FIG. 24 is a side view showing the brazing member 450 according to the first modification of the second embodiment.
  • FIG. 25 is a perspective view showing the brazing member 450 according to the first modification of the second embodiment.
  • the brazing member 450 of the first modification of the second embodiment is twisted by 360 °. That is, the twisted portion 470 has two ring-shaped portions 71.
  • the twisted portion 470 when the twisted portion 470 is twisted by 180 ° or more, the applied force becomes large. Therefore, the twisted portion 470 strongly presses the first sandwiching portion 83 against the first surface 52 of the flat tube 33, and the second sandwiching portion 84 strongly presses against the second surface 53 of the flat tube 33. Therefore, the brazing member 450 is strongly contacted and fixed to the flat tube 33, and the occurrence of poor joining is further suppressed.
  • FIG. 26 is a perspective view showing a brazing member 550 according to the second modification of the second embodiment. Further, as shown in FIG. 26, the brazing member 550 of the modified example 2 of the second embodiment is twisted by 720 °. That is, the twisted portion 570 has four ring-shaped portions 71. Therefore, according to the modified example 2 of the second embodiment, the brazing member 450 can be fixed more strongly than the modified example 1 of the second embodiment and the second embodiment.
  • the U-shaped brazing member 150 is attached to the flat tube 33 and then the twisted portion 170 is formed.
  • the brazing member 150 in which the twisted portion 170 is formed in advance is attached to the flat tube 33. It may be attached to.
  • the brazing member 150 is formed so as to be urged in the direction in which the twisted portion 170 is twisted.
  • a method of fixing the brazing member 150 in this case to the flat tube 33 will be described.
  • the brazing member 150 is fixed to the end of the flat tube 33.
  • brazing member 1 air conditioner, 2 outdoor unit, 3 indoor unit, 4 brazing pipe, 5 brazing circuit, 6 compressor, 7 flow path switching device, 8 outdoor heat exchanger, 9 outdoor blower, 10 expansion part, 11 receiver, 21 indoor Heat exchanger, 22 indoor blower, 31 refrigerant distributor, 32 fins, 33 flat pipe, 34 heat exchange part, 41 inflow pipe, 42 branch path, 43 insertion opening, 50 brazing member, 51 flow hole, 52 first Surface, 53, 2nd surface, 61, bent part, 70, wound part, 71, ring-shaped part, 81, 1st end, 82, 2nd end, 83, 1st pinch, 84, 2nd pinch, 90 Roller, 91 brazing device, 92 brazing furnace, 93 bending device, 94 table, 95 fixing part, 150 brazing member, 170 twisting part, 171 ring-shaped part, 181 first end, 182 second end, 183 1st pinch, 184 2nd pinch, 250 brazing member, 270 winding part, 331 refrigerant

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Details Of Heat-Exchange And Heat-Transfer (AREA)
PCT/JP2020/038863 2020-01-16 2020-10-15 熱交換器の製造方法 Ceased WO2021145036A1 (ja)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5870967A (ja) * 1981-10-23 1983-04-27 Matsushita Refrig Co ろう付け方法
JPS5870968A (ja) * 1981-10-02 1983-04-27 フオ−ド・モ−タ−・カンパニ− 冷却管を管寄せにはんだ付けする方法
JPS5913886U (ja) * 1982-07-14 1984-01-27 カルソニックカンセイ株式会社 熱交換器用コネクタ
JPS61186164A (ja) * 1985-02-15 1986-08-19 Sanden Corp アルミニウム製熱交換器の製造方法
JPH04288958A (ja) * 1991-03-11 1992-10-14 Sanden Corp 熱交換器の製造方法
JP2012096264A (ja) * 2010-11-02 2012-05-24 Furukawa-Sky Aluminum Corp アルミニウム合金置きろうおよびその製造方法
JP2019143816A (ja) * 2018-02-15 2019-08-29 三菱電機株式会社 ロウ付け部材及び熱交換器

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5913886A (ja) * 1982-07-16 1984-01-24 中島　初吉 有機性廃棄物の処理方法
JP2013096264A (ja) * 2011-10-29 2013-05-20 Institute Of National Colleges Of Technology Japan 発電装置

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5870968A (ja) * 1981-10-02 1983-04-27 フオ−ド・モ−タ−・カンパニ− 冷却管を管寄せにはんだ付けする方法
JPS5870967A (ja) * 1981-10-23 1983-04-27 Matsushita Refrig Co ろう付け方法
JPS5913886U (ja) * 1982-07-14 1984-01-27 カルソニックカンセイ株式会社 熱交換器用コネクタ
JPS61186164A (ja) * 1985-02-15 1986-08-19 Sanden Corp アルミニウム製熱交換器の製造方法
JPH04288958A (ja) * 1991-03-11 1992-10-14 Sanden Corp 熱交換器の製造方法
JP2012096264A (ja) * 2010-11-02 2012-05-24 Furukawa-Sky Aluminum Corp アルミニウム合金置きろうおよびその製造方法
JP2019143816A (ja) * 2018-02-15 2019-08-29 三菱電機株式会社 ロウ付け部材及び熱交換器

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