WO2017109933A1 - 熱交換器、これを備えた空気調和機、及び扁平管ｕベンドの製造方法 - Google Patents

熱交換器、これを備えた空気調和機、及び扁平管ｕベンドの製造方法 Download PDF

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Publication number
WO2017109933A1
WO2017109933A1 PCT/JP2015/086205 JP2015086205W WO2017109933A1 WO 2017109933 A1 WO2017109933 A1 WO 2017109933A1 JP 2015086205 W JP2015086205 W JP 2015086205W WO 2017109933 A1 WO2017109933 A1 WO 2017109933A1
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WO
WIPO (PCT)
Prior art keywords
flat
bend
heat exchanger
flat tube
tube
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/JP2015/086205
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English (en)
French (fr)
Inventor
亮平 川端
司 谷川
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
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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 PCT/JP2015/086205 priority Critical patent/WO2017109933A1/ja
Priority to JP2017557617A priority patent/JP6391854B2/ja
Priority to GB1806851.0A priority patent/GB2561098B/en
Priority to US15/770,591 priority patent/US10677531B2/en
Priority to CN201590001651.0U priority patent/CN208579665U/zh
Publication of WO2017109933A1 publication Critical patent/WO2017109933A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • F28D1/047—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 bent, e.g. in a serpentine or zig-zag
    • F28D1/0477—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 bent, e.g. in a serpentine or zig-zag the conduits being bent in a serpentine or zig-zag
    • F28D1/0478—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 bent, e.g. in a serpentine or zig-zag the conduits being bent in a serpentine or zig-zag the conduits having a non-circular cross-section
    • 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
    • B21D53/06—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of metal tubes
    • 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
    • B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
    • B23K1/0012—Brazing of heat exchangers
    • 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
    • B23K1/20—Preliminary treatment of work or areas to be soldered, e.g. in respect of a galvanic coating
    • 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
    • B23K3/00—Tools, devices or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
    • B23K3/06—Solder feeding devices; Solder melting pans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/14—Heat exchangers specially adapted for separate outdoor units
    • F24F1/18—Heat exchangers specially adapted for separate outdoor units characterised by their shape
    • 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
    • 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
    • F28D1/047—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 bent, e.g. in a serpentine or zig-zag
    • 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
    • F28D1/047—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 bent, e.g. in a serpentine or zig-zag
    • F28D1/0471—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 bent, e.g. in a serpentine or zig-zag the conduits having a non-circular cross-section
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/02—Tubular elements of cross-section which is non-circular
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/24—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely
    • F28F1/32—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely the means having portions engaging further tubular elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/24—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely
    • F28F1/32—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely the means having portions engaging further tubular elements
    • F28F1/325—Fins with openings
    • 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
    • F28F9/26—Arrangements for connecting different sections of heat-exchange elements, e.g. of 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
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/26—Arrangements for connecting different sections of heat-exchange elements, e.g. of radiators
    • F28F9/262—Arrangements for connecting different sections of heat-exchange elements, e.g. of radiators for radiators
    • F28F9/268—Arrangements for connecting different sections of heat-exchange elements, e.g. of radiators for radiators by permanent joints, e.g. by welding
    • 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
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/04—Tubular or hollow articles
    • B23K2101/06—Tubes
    • 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
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/04—Tubular or hollow articles
    • B23K2101/14—Heat exchangers
    • 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
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0068—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for refrigerant cycles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2275/00—Fastening; Joining
    • F28F2275/04—Fastening; Joining by brazing
    • 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
    • F28F9/007—Auxiliary supports for elements
    • F28F9/013—Auxiliary supports for elements for tubes or tube-assemblies

Definitions

  • the present invention relates to a heat exchanger in which a flat tube U bend is provided at a connecting portion straddling a row of flat tubes through which a fluid flows, an air conditioner including the heat exchanger, and a method of manufacturing the flat tube U bend.
  • a heat exchanger used in a refrigeration apparatus, an air conditioner, or a heat pump is configured such that a plurality of heat transfer tubes penetrate through fins arranged in parallel at intervals.
  • the heat transfer tubes are arranged in a plurality of stages in a direction crossing the air flow, and a plurality of rows of heat transfer tubes including the plurality of stages are arranged along the air flow direction.
  • the refrigerant normally flows inside the heat transfer tube, and the heat exchanger becomes a part of the refrigerant circuit.
  • a flat tube having a flat cross section is used as the heat transfer tube, and a mutual connection portion straddling a plurality of rows of flat tubes, or a mutual connection portion of a plurality of flat tubes, U Some have bends.
  • a joint in which the cross section of one end is a flat shape and the cross section of the other end is a circular shape is used.
  • U-bend hereinafter, referred to as “circular tube U-bend” that is a separate circular pipe that connects the shape parts to each other (see, for example, Patent Document 1).
  • both ends of the circular tube U bend are processed into a flat shape, and a connecting tube that integrates the circular tube portion and the flat shape portion is used to connect the flat tubes together.
  • a connecting tube that integrates the circular tube portion and the flat shape portion is used to connect the flat tubes together.
  • connection in which flat tubes of the same height in different rows are connected to each other using a flat tube for connection having a flat tube shape in cross section for example, see Patent Document 3.
  • the connecting portions that are connected to each other by connecting U-shaped connecting tubes across the horizontally arranged flat tube rows are U-shaped.
  • the both ends of the circular tube bent into a flat shape are made of clad material with a brazing material bonded to the inner peripheral surface, and the connecting tube and the flat tube are joined by brazing.
  • JP 2012-32089 A (paragraph [0011], FIGS. 2 to 4) JP 2012-82986 A (paragraph [0022], FIG. 1 and FIG. 6) Japanese Patent Laying-Open No. 2015-55410 (paragraphs [0142] and [0143] FIGS. 13 and 14) JP-A-2015-55413 (paragraphs [0115], [0116], [0118], FIGS. 11 and 12)
  • the present invention has been made to solve at least one of the above-described problems, and in providing a connecting structure straddling a plurality of rows of flat tubes arranged in a staggered manner, the number of parts used can be reduced, and The main purpose is to suppress the pressure loss in the flow path.
  • One aspect of the heat exchanger according to the present invention includes a plurality of flat tubes having a flat cross section and a plurality of flat tubes U bends having a flat cross section and a U-shaped appearance.
  • a plurality of flat tube rows provided in a plurality of stages in a fixed direction are arranged in a direction intersecting the fixed direction, and the flat tubes in the plurality of rows are arranged in a staggered manner in the fixed direction,
  • the flat tube U bend is arranged at a connecting portion across each row of the flat tube, and the flat tube U bend is connected to the both ends of the long axis of the flat cross section of both ends of the U bend.
  • the flat tube is twisted so as to be in the same direction as the long axis of the flat cross section of the flat tube.
  • a plurality of flat tubes are arranged in a staggered manner, and the flat tubes U-bends arranged at the connecting portions straddling each row of the flat tubes are flat at least at both ends thereof. Since the direction of the long axis of the cross section is twisted so as to match the direction of the long axis of the flat cross section of the flat tube connected to the cross section, the cross section of the flow path becomes a flat shape uniformly. Joint parts that change the cross-sectional shape are not necessary. Moreover, since the direction of the both ends of the flat tube U bend is smoothly changed, the pressure loss in the flow path can be suppressed.
  • FIG. 1 It is a perspective view which shows the whole structure of the heat exchanger which concerns on Embodiment 1 of this invention. It is sectional drawing of the flat tube of the heat exchanger which concerns on Embodiment 1 of this invention. It is a perspective view of the flat tube U bend of the heat exchanger which concerns on Embodiment 1 of this invention. It is a front view of the flat tube U bend of FIG. It is process drawing which shows the manufacturing method of the flat tube U bend of the heat exchanger which concerns on Embodiment 1 of this invention. It is a schematic diagram which shows an example of the ring soldering part inside the edge part of the flat tube U bend of the heat exchanger which concerns on Embodiment 2 of this invention.
  • FIG. 1 It is a schematic diagram which shows an example of the ring soldering part inside the edge part of the flat tube U bend of the heat exchanger which concerns on Embodiment 2 of this invention. It is process drawing which shows the manufacturing method of the flat pipe U bend of the heat exchanger which concerns on Embodiment 3 of this invention. It is a refrigerant circuit figure of the air conditioner which concerns on Embodiment 4 of this invention. It is a perspective view which shows the other aspect of the heat exchanger which concerns on Embodiment 1 of this invention.
  • FIG. 1 is a perspective view showing an overall configuration of a heat exchanger according to Embodiment 1 of the present invention.
  • FIG. 2 is a cross-sectional view of the flat tube of the heat exchanger according to Embodiment 1 of the present invention.
  • the heat exchanger 20 of Embodiment 1 includes a flat tube 1 that is a heat transfer tube, and fins 2 arranged around the flat tube 1 in order to improve heat exchange efficiency.
  • the flat tube 1 has a flat cross section in a direction perpendicular to the tube axis, and the inside thereof is partitioned into a plurality of flow paths 1 a.
  • the flat tube 1 has a rectifying effect, and the heat exchange efficiency is further improved.
  • a plurality of fins 2 are juxtaposed at intervals, and the flat tube 1 passes therethrough.
  • the flat tubes 1 are arranged in a plurality of stages along a certain direction intersecting the air flow, and the end portion on the side where the joint is not connected (right side in FIG. 1) is bent into a hairpin shape.
  • column of the flat tube 1 which consists of the multistage is arranged in multiple rows along the air flow direction. Adjacent rows of flat tubes are arranged in a staggered manner in the above-mentioned fixed direction, that is, the step direction. That is, the plural rows of flat tubes 1 are arranged in a staggered manner so that the positions of the end portions on the side requiring the joint (left side in FIG. 1) are shifted in the direction intersecting the air flow. And the mutual connection part straddling the row
  • FIG. 3 is a perspective view showing a flat tube U bend of the heat exchanger according to Embodiment 1 of the present invention.
  • FIG. 4 is a front view of the flat tube U-bend of FIG.
  • the flat tube U bend 3 includes a U-shaped main body portion 6 and an end portion 5 serving as a joint portion with the flat tube 1.
  • the cross section of the flat tube U bend 3 is uniformly flat, but the end portion 5 into which the flat tube 1 to be connected is inserted is subjected to tube expansion processing.
  • the flat tube U bend 3 is formed in a U shape in the same plane X along the long axis of the flat cross section, and the length of the flat cross section of at least both end portions 5 of the flat tube U bend 3 is long.
  • the direction of the shaft is twisted so as to coincide with the direction of the long axis of the flat cross section of the flat tube 1 to be connected.
  • the twist angle ⁇ is determined by the arrangement of the flat tubes 1 to be joined. Note that the joint portion between the flat tube U bend 3 and the flat tube 1 is firmly fixed by brazing.
  • FIG. 5 is a process diagram showing a method for manufacturing the flat tube U bend of the heat exchanger according to Embodiment 1 of the present invention.
  • the flat tube U bend 3 is manufactured so that it can be laid between the flat tubes 1 to be connected arranged in a staggered manner.
  • the entire circular tube U bend 30A is compressed in the tube radial direction so that the cross-sectional shape of the circular tube U bend 30A becomes a flat shape, thereby creating the flat tube U bend 3 (FIG.
  • the flat axes of the flat tubes 1 to be connected are arranged in a staggered manner so that the major axis directions of the flat cross sections of the both end portions 5 serving as the joint portions in the flat tube U bend 3 are staggered. It is twisted to match the direction of the long axis of the cross section. Therefore, in the heat exchanger 20 of Embodiment 1, the cross-sectional shape of the flow path is uniformly flat, and a joint component that converts the cross-sectional shape of the flow path is not necessary. Moreover, the direction of the both ends of the flat tube U bend 3 can be changed smoothly, and the pressure loss in a flow path can be suppressed. In order to make the major axis of the flat cross section coincide, both ends 5 of the flat tube U bend 3 may be twisted or the U-shaped main body 6 may be twisted.
  • the flat tube U bend 3 is formed by bending a straight tube made of a circular tube having a circular cross section into a U shape within the same plane X, and the entire circular tube U bend 30A. Created by compressing in the radial direction. Therefore, it is possible to reduce the bending R when bending into a U shape, and it is not necessary to create an extrusion die.
  • FIG. FIG. 6 is a schematic view showing an example of a ring soldering portion inside the end portion of the flat tube U bend of the heat exchanger according to Embodiment 2 of the present invention.
  • the heat exchanger 20 of the second embodiment is arranged such that when the end portion 5 of the flat tube U bend 3 is expanded, the ring row 4 is disposed inside the end portion 5 and expanded together to expand both ends.
  • the caulking ring 4 is caulked on the inner wall surface of the portion 5, and then the flat tube 1 to be connected is inserted into the end portion 5 and put into the furnace in this state, whereby the flat tube 1 and the flat tube U bend 3 are brazed. It is made to be attached.
  • FIG. 7 is a schematic view showing an example of a ring soldering portion inside the end portion of the flat tube U bend of the heat exchanger according to Embodiment 2 of the present invention.
  • the ring solder 4 is caulked inside the end 5 of the flat tube U bend 3
  • the ring solder 4 is caulked so as to protrude outward from the tip.
  • FIG. 8 is a process diagram showing a method for manufacturing a flat tube U-bend of an exchanger according to Embodiment 3 of the present invention.
  • tube is abbreviate
  • a circular straight pipe having a cross section whose final shape can be the dimension after the pipe expansion can be laid between the flat pipes 1 to be connected arranged in a staggered manner.
  • the tube is bent into a U shape to create a circular tube U bend 30A (FIG. 8A).
  • the entire circular tube U bend 30A is compressed in the tube radial direction so that the cross-sectional shape of the circular tube U bend 30A becomes a flat shape, thereby creating the flat tube U bend 3 (FIG. 8B).
  • the direction of the major axis of each flat section of the both ends 5a of the flat pipe U bend 3 is the direction of the major axis of each flat section of the flat pipe 1 to be connected so that the flat pipe 1 to be connected can be joined.
  • the flat tube U bend 3 is entirely twisted so as to coincide with each other, and the flat tube U bend 3 is made into a final shape (FIG. 8C).
  • the end portion 5a of the circular tube U bend 30A and the flat tubes 1 arranged in a staggered manner are joined by brazing to obtain a heat exchanger as shown in FIG.
  • a circular pipe U-bend 30A is created by bending a straight pipe made of a circular circular pipe having a cross section whose final shape can be a dimension after pipe expansion, After that, the entire circular tube U bend 30A is compressed in the radial direction to create the flat tube U bend 3. Therefore, the bending R when bending into a U shape can be reduced. Further, the tube expansion process can be omitted.
  • FIG. 9 shows a refrigerant circuit diagram of an air conditioner according to Embodiment 4 of the present invention.
  • the heat exchanger 20 described in Embodiment 1 is used as an outdoor heat exchanger or an indoor heat exchanger. Is.
  • a compressor 61, a four-way valve 62, an outdoor heat exchanger 63, a decompressor 64, and an indoor heat exchanger 65 are connected in a loop by a refrigerant pipe 70, and the indoor unit 50, the outdoor unit 60, Valves 68 and 69 are arranged between them.
  • the outdoor heat exchanger 63 is provided with an outdoor fan 66
  • the indoor heat exchanger 65 is provided with an indoor fan 67.
  • the low-pressure and low-temperature gas refrigerant is compressed into the high-temperature and high-pressure gas refrigerant by the compressor 61 of the outdoor unit 60 and sent to the four-way valve 62 during the cooling operation. Then, the refrigerant is guided from the four-way valve 62 to the outdoor heat exchanger 63 through the refrigerant pipe 70.
  • the outdoor heat exchanger 63 performs heat exchange between the refrigerant and the air, and releases condensation heat to the outdoors. That is, the outdoor heat exchanger 63 acts as a condenser.
  • the high-pressure liquid refrigerant exiting from the outdoor heat exchanger 63 is converted into a low-pressure and low-temperature gas-liquid two-phase refrigerant by the decompressor 64 and led to the indoor heat exchanger 65 of the indoor unit 50 through the valve 69.
  • the indoor heat exchanger 65 performs a cooling operation for exchanging heat between the refrigerant and the air to cool the room. That is, the indoor heat exchanger 65 acts as an evaporator. Then, the low-pressure and low-temperature gas refrigerant is guided to the compressor 61 through the valve 68 and the four-way valve 62 to perform the refrigerant cycle operation.
  • the indoor heat exchanger 65 acts as a condenser and the outdoor heat exchanger 63 acts as an evaporator by switching the four-way valve 62 to make the refrigerant flow in the opposite direction to that in the cooling operation. The rest is the same as in the cooling operation.
  • the heat exchanger 20 of the first embodiment is used as the outdoor heat exchanger 63 or the indoor heat exchanger 65, the manufacture becomes easy and the manufacturing cost of the air conditioner is reduced. Can be reduced.

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Abstract

　断面が扁平形状の複数の扁平管と、断面が扁平形状で外観がＵ字形状の複数の扁平管Ｕベンドと、を有し、扁平管が一定方向に複数段設けられて成る扁平管列が、一定方向と交差する方向に複数列配置され、かつ、複数列の扁平管は互いに千鳥状に配置されており、扁平管の各列を跨ぐ連結部分に扁平管Ｕベンドが配置されており、扁平管Ｕベンドは、該Ｕベンドの両端部の扁平断面の長軸が、該両端部と接続されている扁平管の扁平断面の長軸の向きと同じ向きとなるように捻られている熱交換器。

Description

熱交換器、これを備えた空気調和機、及び扁平管Ｕベンドの製造方法
　本発明は、流体が内部を流れる扁平管の列を跨ぐ連結部に扁平管Ｕベンドを設けた熱交換器、これを備えた空気調和機、及び扁平管Ｕベンドの製造方法に関する。
　冷凍装置、空気調和装置、又はヒートポンプに用いる熱交換器は、一般に、間隔を有して複数並置されたフィンに伝熱管が貫通して構成されている。伝熱管は、空気流れと交差する方向へ複数段並設され、その複数段からなる伝熱管の列が空気流れ方向に沿って複数列配置されている。伝熱管の内部には通常冷媒が流れ熱交換器は冷媒回路の一部となる。
　上記のような熱交換器において、伝熱管として断面が扁平形状の扁平管を用い、複数列の扁平管の列を跨ぐ相互の連結部分、又は複数段の扁平管の相互の連結部分に、Ｕベンドを備えたものがある。例えば、一方の端部の断面が扁平形状であり、他方の端部の断面が円形状であるジョイントを使用し、扁平管相互の接続は、断面形状の変換を行うジョイントと、該ジョイントの円形状部相互を接続する別体の円管でなるＵベンド（以下、「円管Ｕベンド」という）を介して行うようにしたものがある（例えば、特許文献１参照）。
　また、上記のようなジョイントは使用せず、円管Ｕベンドの両端部を扁平形状に加工して、円管部と扁平形状部とを一体化した接続管を使用し、扁平管相互を接続するようにしたものがある（例えば、特許文献２参照）。
　また、断面が一様に扁平管形状である接続用扁平管を用いて、異なる列の同じ高さの扁平管同士を接続したものもある（例えば、特許文献３参照）。
　さらに、扁平管を用いた２列構造の熱交換ユニットの水平に配置された扁平管の列を跨ぐ相互の連結部分をＵ字型の接続管で連結したものにおいて、接続管は、Ｕ字状に曲げた円管の両端を扁平にして作成され、接続管の両端部は、内周面にロウ材を貼り合わせたクラッド材で構成され、接続管と扁平管とがロウ付けにより接合されたものがある（例えば、特許文献４参照）。
特開２０１２－３２０８９号公報（段落［００１１］、図２～図４） 特開２０１２－８２９８６号公報（段落［００２２］、図１、図６） 特開２０１５－５５４１０号公報（段落［０１４２］、［０１４３］図１３、図１４） 特開２０１５－５５４１３号公報（段落［０１１５］、［０１１６］、［０１１８］、図１１、図１２）
　しかしながら、扁平管相互の連結部となる端部にそれぞれジョイントを接続し、ジョイントを介して円管Ｕベンドと接続するようにした特許文献１の技術においては、扁平管とジョイントの接合点数が増え、製造不良の発生確率が高くなる。更に、ジョイント部品の材料費も必要となるため、コストが高くなるといった課題がある。
　また、特許文献２の技術においては、扁平管相互の接続部の接合点数を減らせるため、既述した特許文献１の技術と比べると製造不良の発生確率を低く抑えることができる。しかしながら、特許文献２の技術においては、扁平管相互の接続部に、断面が円形の流路が存在するため、流路形状の変化による圧損が生じ、性能が悪化する。このような流路形状の変化による圧損は、扁平形状部から円管部に至る変換部の長さを延長することで抑制できるが、接続部が長くなるため材料費の増加や他部品の配置制約が生じるといった課題がある。
　また、特許文献３の技術においては、接続用扁平管を平面的に折りまげて作成すると、折り曲げ部の内Ｒと外Ｒの差が大きくなる。そのため、折り曲げ時に引張荷重がかかる外Ｒ部の肉厚が薄くなり、耐圧強度が低下する。また、曲げＲも大きくなるといった課題がある。
　さらに、特許文献４の技術においては、接続管の両端部のクラッド層の内側に扁平管を挿入するため、母材と扁平管のクリアランスよりもクラッド層の体積は必ず小さくなる。クリアランスに対し、ロウ材量が少ないと、ロウ付け不良の原因や、接続管の外側にフィレットができず、ロウ付け状態を外観で視認し難いといった課題がある。
　本発明は、前記のような課題の少なくとも１つを解決するためになされたもので、千鳥状に配置した複数列の扁平管の列を跨ぐ連結構造を備えるにあたり、使用部品を少なくでき、かつ流路での圧損を抑制できるようにすることを主目的としている。
　本発明に係る熱交換器の一態様は、断面が扁平形状の複数の扁平管と、断面が扁平形状で外観がＵ字形状の複数の扁平管Ｕベンドと、を有し、前記扁平管が一定方向に複数段設けられて成る扁平管列が、前記一定方向と交差する方向に複数列配置され、かつ、前記複数列の扁平管は前記一定方向において互いに千鳥状に配置されており、前記扁平管の各列を跨ぐ連結部分に前記扁平管Ｕベンドが配置されており、前記扁平管Ｕベンドは、該Ｕベンドの両端部の扁平断面の長軸が、該両端部と接続されている前記扁平管の扁平断面の長軸の向きと同じ向きとなるように捻られているものである。
　本発明に一態様に係る熱交換器は、複数列の扁平管が千鳥状に配置され、扁平管の各列を跨ぐ連結部分に配置されている扁平管Ｕベンドは、少なくともその両端部の扁平断面の長軸の向きが、これと接続されている扁平管の扁平断面の長軸の向きと一致するよう捻られているので、流路の断面形状が一様に扁平形状となり、流路の断面形状を変換するジョイント部品が必要無くなる。また、扁平管Ｕベンドの両端部の向きが滑らかに転換しているので、流路での圧損を抑制できる。
本発明の実施の形態１に係る熱交換器の全体構成を示す斜視図である。 本発明の実施の形態１に係る熱交換器の扁平管の断面図である。 本発明の実施の形態１に係る熱交換器の扁平管Ｕベンドの斜視図である。 図３の扁平管Ｕベンドの正面図である。 本発明の実施の形態１に係る熱交換器の扁平管Ｕベンドの製造方法を示す工程図である。 本発明の実施の形態２に係る熱交換器の扁平管Ｕベンドの端部内側のリングロウかしめ部の一例を示す模式図である。 本発明の実施の形態２に係る熱交換器の扁平管Ｕベンドの端部内側のリングロウかしめ部の一例を示す模式図である。 本発明の実施の形態３に係る熱交換器の扁平管Ｕベンドの製造方法を示す工程図である。 本発明の実施の形態４に係る空気調和機の冷媒回路図である。 本発明の実施の形態１に係る熱交換器の他の態様を示す斜視図である。
実施の形態１．
　図１は本発明の実施の形態１に係る熱交換器の全体構成を示す斜視図である。図２は本発明の実施の形態１に係る熱交換器の扁平管の断面図である。
　図１に示すように、実施の形態１の熱交換器２０は、伝熱管である扁平管１と、熱交換効率を向上させるために扁平管１の周囲に配置したフィン２とを備えている。扁平管１は、図２に示すように、管軸と直交する方向の断面が扁平形状であって、内部が複数の流路１ａに区画されている。扁平管１はこれによって整流効果が得られ、熱交換効率が更に向上する。フィン２は間隔を有して複数並置されており、扁平管１が貫通している。
　扁平管１は、空気流れに交差する一定の方向に沿って複数段並設されており、継手を接続しない側（図１の右側）の端部は、ヘアピン状に折り曲げられている。そして、その複数段からなる扁平管１の列が、空気流れ方向に沿って複数列配置されている。また、隣合う列の扁平管は、上記一定方向、すなわち段方向において千鳥状に配置されている。つまり、複数列の扁平管１は、その継手を要する側（図１の左側）の互いの端部の位置が、空気流れに交差する方向でずれるように千鳥状に配置されている。そして、複数列の扁平管１の列を跨ぐ相互の連結部分は、扁平管Ｕベンド３で接合されている。
　図３は本発明の実施の形態１に係る熱交換器の扁平管Ｕベンドを示す斜視図である。図４は図３の扁平管Ｕベンドの正面図である。
　扁平管Ｕベンド３は、図３及び図４に示すように、外観がＵ字形状の本体部６と、扁平管１との接合部となる端部５とを備えている。扁平管Ｕベンド３の断面は一様に扁平形状となっているが、接続対象の扁平管１が挿入される端部５は、拡管加工がされている。
　これを更に詳述すると、扁平管Ｕベンド３は、その扁平断面の長軸に沿う同一平面Ｘ内でＵ字形状に形成され、かつ扁平管Ｕベンド３の少なくとも両端部５の扁平断面の長軸の向きが、接続対象である扁平管１の扁平断面の長軸の向きと一致するように捻られている。捻り角度θは、接合対象の扁平管１の配置により決められる。
　なお、扁平管Ｕベンド３と扁平管１との接合部は、ロウ付けにより強固に固定される。
　次に、実施の形態１における扁平管Ｕベンド３の製造方法について図５に基づき、図１～図４を参照しながら説明する。図５は本発明の実施の形態１に係る熱交換器の扁平管Ｕベンドの製造方法を示す工程図である。扁平管Ｕベンド３は、千鳥状に配置された接続対象の扁平管１の間に架設できるように製造される。
　まず、同一平面Ｘ内でＵ字状に折り曲げ、円管Ｕベンド３０Ａを作成する（図５（ａ））。次いで、円管Ｕベンド３０Ａの断面形状が扁平形状となるように、円管Ｕベンド３０Ａの全体を管径方向に圧縮して、扁平管Ｕベンド３を作成する（図５（ｂ））。その後、扁平管Ｕベンド３の両端部５を、その各扁平断面の長軸の向きが、接続対象の扁平管１の各扁平断面の長軸の向きと一致するように捻り、さらにその両端部５を拡管して、扁平管Ｕベンド３を製造する（図５（ｃ））。
　上記のようにして製造された扁平管Ｕベンド３は、扁平管Ｕベンド３の両端部５と千鳥状に配置された扁平管１とをロウ付けにより接合して、図１のような熱交換器を得る。
　このように、実施の形態１の熱交換器２０は、扁平管Ｕベンド３における接合部となる両端部５の扁平断面の長軸の向きが、千鳥配置された接続すべき扁平管１の扁平断面の長軸の向きと一致するように捻られている。そのため、実施の形態１の熱交換器２０は、流路の断面形状が一様に扁平形状となり、流路の断面形状を変換するジョイント部品が必要無くなる。また、扁平管Ｕベンド３の両端部の向きを滑らかに転換することができて、流路での圧損を抑制することができる。
　なお、扁平断面の長軸を一致させるには、扁平管Ｕベンド３の両端部５を捻っても、またはＵ字形状の本体部６を捻ってもよい。
　また、実施の形態１の熱交換器２０は、扁平管Ｕベンド３を、断面が円形状の円形管でなる直管を同一平面Ｘ内でＵ字状に折り曲げかつ円管Ｕベンド３０Ａ全体を径方向に圧縮して作成している。そのため、Ｕ字状に曲げる際の曲げＲを小さくすることができ、かつ押し出し型を作成する必要が無くなる。
　以上ここでは、扁平管１の列が２列のものを例に挙げて説明した。しかし、互いに千鳥状に配置された扁平管１の列が３列以上となっている図１０に示すような熱交換器でも、扁平管Ｕベンド３を利用して、同様の効果を得ることができる。
実施の形態２．
　図６は本発明の実施の形態２に係る熱交換器の扁平管Ｕベンドの端部内側のリングロウかしめ部の一例を示す模式図である。
　実施の形態２の熱交換器２０は、図６に示すように扁平管Ｕベンド３の端部５の拡管時に、端部５の内部にリングロウ４を配置し、一緒に拡管することで、両端部５の内壁面にリングロウ４をかしめ、その後、端部５内に接続対象の扁平管１を挿入し、その状態で炉に投入することで、扁平管１と扁平管Ｕベンド３とがロウ付け接合されるようにしたものである。
　このように、実施の形態２の熱交換器２０においては、扁平管Ｕベンド３の端部５の拡管時に、端部５の内部にリングロウ４を配置し、それらを一緒に拡管することで、両端部の内部にリングロウ４をかしめている。このため、扁平管Ｕベンド３の両端部５に扁平管１を挿入する際に、これらの間にロウ材を挿入する工程を省略できる。
　図７は本発明の実施の形態２に係る熱交換器の扁平管Ｕベンドの端部内側のリングロウかしめ部の一例を示す模式図である。
　ここでは、扁平管Ｕベンド３の端部５の内部にリングロウ４をかしめる際に、リングロウ４が先端部から外部に突出するようかしめたものである。
　このように、リングロウ４が端部５から外部に突出するようにかしめることで、リングロウ４の端部５からの突出部８によって、ロウ付け後に外フィレットを形成することができ、外観検査の作業性を向上することができる。
実施の形態３．
　次に、本発明の実施の形態３の熱交換器の製造方法を図８に基づき、図１～図４を参照しながら説明する。図８は本発明の実施の形態３に係る交換器の扁平管Ｕベンドの製造方法を示す工程図である。なお、管内部の流路の図示は省略している。
　熱交換器２０の製造は、まず、最終形状が拡管後の寸法となり得る断面を有する円形の直管を、千鳥状に配置された接続対象の扁平管１間に架設できるように、同一平面Ｘ内でＵ字状に折り曲げ、円管Ｕベンド３０Ａを作成する（図８（ａ））。次いで、円管Ｕベンド３０Ａの断面形状が扁平形状となるように、円管Ｕベンド３０Ａ全体を管径方向に圧縮して、扁平管Ｕベンド３を作成する（図８（ｂ））。その後、接続対象の扁平管１と接合できるように、扁平管Ｕベンド３の両端部５ａの各扁平断面の長軸の向きが、接続対象の扁平管１の各扁平断面の長軸の向きと一致するように、扁平管Ｕベンド３を全体的に捻り、扁平管Ｕベンド３を最終形状にする（図８（ｃ））。その後、円管Ｕベンド３０Ａの端部５ａと千鳥状に配置された扁平管１とをロウ付けにより接合して、図１のような熱交換器を得る。
　実施の形態３の熱交換器の製造方法によれば、最終形状が拡管後の寸法となり得る断面を有する円形状の円形管でなる直管を曲げ加工して円管Ｕベンド３０Ａを作成し、その後、円管Ｕベンド３０Ａ全体を径方向に圧縮して、扁平管Ｕベンド３を作成するので、Ｕ字状に曲げる際の曲げＲを小さくすることができる。また、拡管工程を省略することもできる。
　捻り角度θにより扁平形状の断面が変形した場合は、例えば水圧拡管等により形状修正し、流路を確保するのが好ましい。
実施の形態４.
　図９は本発明の実施の形態４に係る空気調和機の冷媒回路図を示すもので、前述の実施の形態１で説明した熱交換器２０を室外熱交換器又は室内熱交換器として用いたものである。
　この空気調和機は、圧縮機６１、四方弁６２、室外熱交換器６３、減圧器６４、及び室内熱交換器６５が、冷媒配管７０によってループ状に接続され、室内機５０と室外機６０との間にバルブ６８、６９が配置されている。また、室外熱交換器６３には室外送風機６６が併設され、室内熱交換器６５には室内送風機６７が併設されている。
　実施の形態４の空気調和機において、冷房運転時には低圧低温のガス冷媒は室外機６０の圧縮機６１により高温高圧のガス冷媒に圧縮され、四方弁６２に送られる。そして、四方弁６２から冷媒配管７０により室外熱交換器６３に導かれる。室外熱交換器６３は冷媒と空気との間で熱交換を行い、凝縮熱を室外に放出する。すなわち、室外熱交換器６３が凝縮器として作用する。室外熱交換器６３から出た高圧の液冷媒は、減圧器６４により低圧低温の気液二相冷媒となり、バルブ６９を介して室内機５０の室内熱交換器６５に導かれる。室内熱交換器６５は、冷媒と空気との間で熱交換を行い、室内を冷やす冷房運転を行う。すなわち、室内熱交換器６５が蒸発器として作用する。そして、低圧低温のガス冷媒は、バルブ６８、四方弁６２を経て圧縮機６１に導かれ、冷媒サイクル運転を行う。
　暖房運転を行う場合は、四方弁６２を切り換えて冷媒の流れを冷房運転の場合と逆方向にすることにより、室内熱交換器６５が凝縮器、室外熱交換器６３が蒸発器として作用する。それ以外は冷房運転の場合と同様である。
　実施の形態４の空気調和器によれば、室外熱交換器６３又は室内熱交換器６５として実施の形態１の熱交換器２０を用いているので、製造が容易となり空気調和機の製造コストを削減することができる。
　１　扁平管、１ａ　流路、２　フィン、３　扁平管Ｕベンド、４　リングロウ、５，５ａ　扁平管Ｕベンドの端部、６　扁平管Ｕベンドの本体部、８　リングロウの突出部、２０　熱交換器、３０Ａ　円管Ｕベンド、５０　室内機、６０　室外機、６１　圧縮機、６２　四方弁、６３　室外熱交換器、６４　減圧器、６５　室内熱交換器、６６　室外送風機、６７　室内送風機、６８　バルブ、６９　バルブ、７０　冷媒配管、Ｘ　同一平面、θ　捻り角度。

Claims (10)

  1. 　断面が扁平形状の複数の扁平管と、断面が扁平形状で外観がＵ字形状の複数の扁平管Ｕベンドと、を有し、
    　前記扁平管が一定方向に複数段設けられて成る扁平管列が、前記一定方向と交差する方向に複数列配置され、かつ、前記複数列の扁平管は前記一定方向において互いに千鳥状に配置されており、
    　前記扁平管の各列を跨ぐ連結部分に前記扁平管Ｕベンドが配置されており、
    　前記扁平管Ｕベンドは、該Ｕベンドの両端部の扁平断面の長軸が、該両端部と接続されている前記扁平管の扁平断面の長軸の向きと同じ向きとなるように捻られている熱交換器。
  2. 　前記扁平管Ｕベンドの前記両端部が他の部分に対して捻られている請求項１に記載の熱交換器。
  3. 　前記扁平管Ｕベンドと前記扁平管との接合部にロウ材が介在している請求項１または２に記載の熱交換器。
  4. 　前記扁平管が貫通した複数のフィンが平行に配置されている請求項１～３のいずれか一項に記載の熱交換器。
  5. 　前記扁平管の内部が複数の流路に区画されている請求項１～４のいずれか一項に記載の熱交換器。
  6. 　少なくとも圧縮機、室外熱交換器、減圧器、及び室内熱交換器を有し、これらが冷媒配管によってループ状に接続された空気調和機であって、
    　前記室外熱交換器又は前記室内熱交換器として請求項１～５のいずれか一項に記載の熱交換器を備えた空気調和機。
  7. 　断面が円形状の直管を、同一平面内でＵ字形状に折り曲げ、その後、管径方向に圧縮して断面を扁平形状とする工程と、
    　断面が扁平形状とされたＵ字形状管の少なくとも両端部を、該両端部の扁平断面の長軸の向きが、接続対象である段差を有した２つの扁平管の各扁平断面の長軸の向きと一致するように捻る工程と、を有する扁平管Ｕベンドの製造方法。
  8. 　前記両端部の内側を拡径する請求項７に記載の扁平管Ｕベンドの製造方法。
  9. 　前記両端部の内側を拡径する時、同時に前記両端部の内壁に溶接用のリングロウをかしめる請求項８に記載の扁平管Ｕベンドの製造方法。
  10. 　前記リングロウを前記両端部から外側に突出させて前記リングロウをかしめる請求項９に記載の扁平管Ｕベンドの製造方法。
PCT/JP2015/086205 2015-12-25 2015-12-25 熱交換器、これを備えた空気調和機、及び扁平管ｕベンドの製造方法 Ceased WO2017109933A1 (ja)

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