WO2019142642A1 - 室内熱交換器および空気調和装置 - Google Patents

室内熱交換器および空気調和装置 Download PDF

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Publication number
WO2019142642A1
WO2019142642A1 PCT/JP2018/048147 JP2018048147W WO2019142642A1 WO 2019142642 A1 WO2019142642 A1 WO 2019142642A1 JP 2018048147 W JP2018048147 W JP 2018048147W WO 2019142642 A1 WO2019142642 A1 WO 2019142642A1
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WO
WIPO (PCT)
Prior art keywords
indoor
heat exchanger
outdoor
indoor heat
flat
Prior art date
Application number
PCT/JP2018/048147
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
俊 吉岡
祥志 松本
智歩 藤井
Original Assignee
ダイキン工業株式会社
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 ダイキン工業株式会社 filed Critical ダイキン工業株式会社
Priority to CN201880087296.1A priority Critical patent/CN111630336B/zh
Priority to ES18901558T priority patent/ES2941545T3/es
Priority to US16/964,027 priority patent/US20210041115A1/en
Priority to EP18901558.9A priority patent/EP3745075B1/de
Publication of WO2019142642A1 publication Critical patent/WO2019142642A1/ja

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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
    • F28D1/0233—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 air flow channels
    • F28D1/024—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 air flow channels with an air driving element
    • 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
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0059—Indoor units, e.g. fan coil units characterised by heat exchangers
    • F24F1/0067—Indoor units, e.g. fan coil units characterised by heat exchangers by the shape of the heat exchangers or of parts thereof, e.g. of their fins
    • 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
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0068—Indoor units, e.g. fan coil units characterised by the arrangement of refrigerant piping outside the heat exchanger within the unit casing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/22—Means for preventing condensation or evacuating condensate
    • 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
    • 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
    • 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
    • F28D1/05391—Assemblies of conduits connected to common headers, e.g. core type radiators with multiple rows of conduits or with multi-channel conduits combined with a particular flow pattern, e.g. multi-row multi-stage 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
    • F28F1/02—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
    • F28F17/00—Removing ice or water from heat-exchange apparatus
    • F28F17/005—Means for draining condensates from heat exchangers, e.g. from evaporators
    • 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
    • F28D2001/0253—Particular components
    • F28D2001/026—Cores
    • F28D2001/0273—Cores having special shape, e.g. curved, annular
    • 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
    • F28F2215/00—Fins
    • F28F2215/12—Fins with U-shaped slots for laterally inserting conduits

Definitions

  • the present disclosure relates to an indoor heat exchanger and an air conditioner.
  • Patent Document 1 Japanese Patent Laid-Open No. 2016-0419866
  • This indication is made in view of the point mentioned above, and a subject in this indication provides an indoor heat exchanger and an air harmony device which have a plurality of flat tubes which can control scattering of condensation water. It is.
  • the indoor heat exchanger which concerns on a 1st viewpoint is an indoor heat exchanger used for the indoor unit of an air conditioning apparatus.
  • the indoor heat exchanger comprises a plurality of flat tubes and a plurality of heat transfer fins.
  • the flat tube has a flow passage through which the refrigerant passes.
  • a plurality of flat tubes are lined up and down.
  • the plurality of heat transfer fins are joined to the plurality of flat tubes.
  • the heat transfer fin has a communicating portion.
  • the communication portion extends vertically.
  • the communication part of the heat transfer fin is a part of the heat transfer fin and is connected to each part located between the flat tubes arranged vertically.
  • the indoor heat exchanger satisfies the relationship of 4.0 ⁇ DP / HT ⁇ 10.0.
  • HT is the height of the flat tube.
  • DP is the pitch of flat tubes arranged vertically.
  • the indoor heat exchanger which concerns on a 2nd viewpoint is an indoor heat exchanger used for an indoor unit.
  • the said indoor unit comprises an air conditioning apparatus with the outdoor unit which has an outdoor heat exchanger.
  • the outdoor heat exchanger includes a plurality of flat tubes and a plurality of heat transfer fins.
  • the indoor heat exchanger also includes a plurality of flat tubes and a plurality of heat transfer fins. These flat tubes have flow paths through which the refrigerant passes.
  • a plurality of flat tubes are lined up and down.
  • the plurality of fins are joined to the plurality of flat tubes.
  • the heat transfer fin has a communicating portion, and the communicating portion extends up and down.
  • the communication part of the heat transfer fin is a part of the heat transfer fin and is connected to each part located between the flat tubes arranged vertically.
  • the value of DP / HT of the indoor heat exchanger is smaller than the value of DP / HT of the outdoor heat exchanger.
  • HT is the height of the flat tube.
  • An indoor heat exchanger is the indoor heat exchanger according to the first aspect or the second aspect, wherein the flat tube is a plurality of upstream flat tubes disposed upstream in the air flow direction, And a plurality of downstream flat tubes disposed downstream of the upstream flat tube in the air flow direction.
  • the indoor heat exchanger which concerns on a 4th viewpoint is an indoor heat exchanger which concerns on either of a 1st viewpoint to a 3rd viewpoint, Comprising:
  • the communication part is located on the leeward side of the flat tube in an air flow direction.
  • the condensed water generated in the flat tube is introduced downward while being transmitted to the communicating portion of the heat transfer fin positioned on the downstream side in the air flow direction, so that the air flow direction of the heat transfer fin It is possible to suppress the scattering of condensed water from the downstream end of the
  • the indoor heat exchanger which concerns on a 5th viewpoint is an indoor heat exchanger which concerns on either of a 1st viewpoint to a 4th viewpoint, Comprising:
  • WF is the length of the heat transfer fin in the air flow direction.
  • WL is the length of the communicating portion in the air flow direction.
  • the indoor heat exchanger which concerns on a 6th viewpoint is an indoor heat exchanger which concerns on either of a 1st viewpoint to a 5th viewpoint, Comprising:
  • the heat-transfer fin has a cut-and-raised part.
  • the longitudinal direction of the cut and raised portion is the vertical direction.
  • the indoor heat exchanger pertaining to the seventh aspect is an indoor heat exchanger pertaining to any of the first aspect to the sixth aspect, and satisfies the relationship of 4.6 ⁇ DP / HT ⁇ 8.0.
  • An air conditioner according to an eighth aspect includes an indoor unit having an indoor heat exchanger according to any one of the first to seventh aspects, and an outdoor unit having an outdoor heat exchanger.
  • FIG. 14 is an explanatory view of a downstream side vicinity portion in the air flow direction of the B-B cross section in FIG. 13 of the water guiding rib of the indoor fin according to the modified example A.
  • FIG. 1 shows a schematic configuration diagram of the air conditioning device 1.
  • the air conditioning apparatus 1 is an apparatus capable of performing cooling and heating in a room such as a building by performing a vapor compression refrigeration cycle.
  • the air conditioner 1 mainly includes an outdoor unit 2, an indoor unit 3, and a liquid refrigerant communication pipe 4 and a gas refrigerant communication pipe 5, which are refrigerant paths connecting the outdoor unit 2 and the indoor unit 3. There is.
  • the vapor compression type refrigerant circuit 6 of the air conditioner 1 is configured by connecting the outdoor unit 2 and the indoor unit 3 via the refrigerant communication pipes 4 and 5.
  • the refrigerant communication pipes 4 and 5 are refrigerant pipes that are constructed on site when the air conditioning apparatus 1 is installed at an installation place such as a building.
  • the refrigerant circuit 6 is filled with R32 as a working refrigerant.
  • Outdoor Unit (2-1) Schematic Configuration of Outdoor Unit
  • the outdoor unit 2 is installed outdoors (on the roof of a building or near a wall of a building, etc.) and constitutes a part of the refrigerant circuit 6.
  • the outdoor unit 2 mainly includes an accumulator 7, a compressor 8, a four-way switching valve 10, an outdoor heat exchanger 11, an outdoor expansion valve 12 as an expansion mechanism, a liquid side closing valve 13, and a gas side closing valve. 14, an outdoor fan 15, and a casing 40.
  • the accumulator 7 is a container for supplying a gas refrigerant to the compressor, and is provided on the suction side of the compressor 8.
  • the compressor 8 sucks in a low pressure gas refrigerant, compresses it, and discharges a high pressure gas refrigerant.
  • the outdoor heat exchanger 11 functions as a radiator of the refrigerant discharged from the compressor 8 during the cooling operation, and functions as an evaporator of the refrigerant sent from the indoor heat exchanger 51 during the heating operation. .
  • the liquid side of the outdoor heat exchanger 11 is connected to the outdoor expansion valve 12, and the gas side is connected to the four-way switching valve 10.
  • the outdoor expansion valve 12 decompresses the refrigerant released in the outdoor heat exchanger 11 during the cooling operation before sending it to the indoor heat exchanger 51, and the outdoor heat exchanger removes the refrigerant released in the indoor heat exchanger 51 during the heating operation. It is a motor-operated expansion valve that can be depressurized before being sent to 11.
  • One end of a liquid refrigerant communication pipe 4 is connected to the liquid side closing valve 13 of the outdoor unit 2.
  • One end of a gas refrigerant communication pipe 5 is connected to the gas side shut-off valve 14 of the outdoor unit 2.
  • the devices and valves of the outdoor unit 2 are connected by refrigerant pipes 16 to 22.
  • the outdoor fan 15 is disposed inside the outdoor unit 2, sucks the outdoor air, supplies the outdoor air to the outdoor heat exchanger 11, and then discharges the air out of the unit (indicated by arrows in FIG. 3).
  • the outdoor air supplied by the outdoor fan 15 is used as a cooling source or a heating source in heat exchange with the refrigerant of the outdoor heat exchanger 11.
  • the casing 40 mainly includes a bottom frame 40a, a top plate 40b, and a left front plate 40c, as shown in the schematic external perspective view of the outdoor unit 2 of FIG. 2 and the schematic plan view of the outdoor unit 2 of FIG.
  • the right front plate 40d and the right side plate 40e are provided.
  • the bottom frame 40a is a horizontally long substantially rectangular plate-like member which constitutes the bottom portion of the casing 40, and is installed on the field installation surface by means of fixing legs 41 fixed to the lower surface.
  • the top plate 40 b is a horizontally long substantially rectangular plate-like member that constitutes the top surface portion of the casing 40.
  • the left front plate 40c is a plate-like member that mainly constitutes the left front portion and the left side portion of the casing 40, and blows out the air taken into the casing 40 from the rear side and the left side by the outdoor fan 15 to the front side. Two blowouts for the upper and lower are formed side by side. Each air outlet is provided with a fan grille 42 respectively.
  • the right front plate 40d is a plate-like member that mainly constitutes the front portion of the right front portion and the right side surface of the casing 40.
  • the right side plate 40 e is a plate-like member that mainly constitutes a rear portion and a right rear portion of the right side surface of the casing 40.
  • a partition plate 43 is provided which partitions the fan chamber in which the outdoor fan 15 and the like are disposed and the machine chamber in which the compressor 8 and the like are disposed.
  • FIG. 4 shows a schematic external perspective view of the outdoor heat exchanger 11.
  • the outdoor heat exchanger 11 mainly includes a gas-side distributor 23, a liquid-side distributor 24, a plurality of inflow-side return members 25, a plurality of non-inflow-side return members 26, and a plurality of outdoor flat tubes 90; A plurality of outdoor fins 91 are provided.
  • all of the components constituting the outdoor heat exchanger 11 are formed of aluminum or an aluminum alloy, and are mutually joined by brazing or the like.
  • the plurality of outdoor flat tubes 90 are arranged side by side vertically.
  • the plurality of outdoor fins 91 are arranged in the plate thickness direction along the outdoor flat tube 90 and fixed to the plurality of outdoor flat tubes 90.
  • the gas side flow divider 23 is connected to the refrigerant pipe 19 and one of the plurality of outdoor flat pipes 90 which is disposed above.
  • the outdoor heat exchanger 11 functions as a radiator of the refrigerant
  • the refrigerant flowing from the refrigerant pipe 19 into the outdoor heat exchanger 11 is diverted to a plurality of height positions, and the plurality of outdoor flat tubes 90 Send to what is located above.
  • the liquid side flow divider 24 is connected to the refrigerant pipe 20 and one of the plurality of outdoor flat pipes 90 disposed below.
  • the outdoor heat exchanger 11 functions as a radiator of the refrigerant
  • the refrigerant flowing from the lower one of the plurality of outdoor flat tubes 90 is merged, and the outdoor heat exchange is performed via the refrigerant pipe 20. Flow out of the vessel 11.
  • the plurality of inflow side return members 25 are disposed between the gas side flow distributor 23 and the liquid side flow distributor 24 and connect the ends of the outdoor flat tubes 90 provided at different height positions to each other.
  • the end on the opposite side to the end on the side on which the gas-side diverter 23, the liquid-side diverter 24, and the plurality of inflow-side fold-back members 25 are provided in the non-inflow-side fold-back member 26 and the outdoor heat exchanger 11.
  • the ends of the outdoor flat tubes 90 which are provided in the parts and are provided at different height positions are connected to each other.
  • the flow of the refrigerant while turning back the refrigerant at both ends of the outdoor heat exchanger 11 by providing the plurality of inflow side turning back members 25 and the non-inflow side turning back members 26. It is possible.
  • the outdoor flat tube 90 has an upper flat surface 90a forming an upper surface facing vertically upward, a lower flat surface 90b forming a lower surface facing vertically downward, and a large number of small flow paths 90c in which the refrigerant flows.
  • the plurality of flow paths 90c of the outdoor flat pipe 90 are provided side by side in the air flow direction (indicated by an arrow in FIG. 5; the longitudinal direction of the outdoor flat pipe 90 in the flow path sectional view of the flow path 90c).
  • the plurality of outdoor flat tubes 90 the same one is used at the height HT in the vertical direction.
  • the height HT refers to the width in the height direction of the upper flat surface 90 a and the lower flat surface 90 b of the outdoor flat tube 90.
  • the plurality of outdoor flat tubes 90 are arranged in the vertical direction at a predetermined pitch (step pitch DP).
  • the step pitch DP is the distance between the upper flat surface 90 a of the outdoor flat tube 90.
  • the downstream end of the plurality of outdoor flat tubes 90 in the air flow direction is positioned further downstream than the downstream end of the outdoor fin 91 in the air flow direction. Is configured. Thereby, damage or breakage of the downwind side end of the outdoor fin 91 at the time of production or transportation of the outdoor heat exchanger 11 is suppressed.
  • the outdoor fin 91 is a plate-like member extending in the air flow direction and the vertical direction, and a plurality of the outdoor fins 91 are arranged at predetermined intervals in the thickness direction and fixed to the outdoor flat tube 90.
  • the outdoor fins 91 include a plurality of insertion portions 92, an outdoor communication portion 97a, a plurality of leeward portions 97b, a waffle portion 93, a leeward side fin tab 94a, a leeward side fin tab 94b, an outdoor slit 95, a leeward side rib 96a, a leeward side rib 96b, etc. have.
  • the thickness in the thickness direction of the flat portion of the outdoor fin 91 is, for example, 0.05 mm or more and 0.15 mm or less.
  • the insertion portion 92 is formed to be horizontally cut from the edge on the windward side of the outdoor fin 91 toward the windward side to the front of the windward edge.
  • the plurality of insertion portions 92 are provided to line up in the vertical direction.
  • the insertion portion 92 constitutes a fin collar formed by burring or the like.
  • the shape of the insertion portion 92 substantially matches the outer shape of the cross section of the outdoor flat tube 90, and the insertion portion 92 is brazed to each other in a state where the outdoor flat tube 90 is inserted.
  • the outdoor communication portion 97 a is a portion of the outdoor fin 91 that is continuous in the vertical direction further on the windward side than the windward end of the outdoor flat tube 90. From the viewpoint of securing the frost resistance, the distance in the air flow direction from the wind upper end of the outdoor flat tube 90 to the wind upper end of the outdoor communication portion 97a of the outdoor fin 91 is preferably 4 mm or more.
  • the plurality of upwind portions 97 b extend from the different height positions of the outdoor communication portion 97 a toward the downstream side in the air flow direction.
  • the respective wind lower portions 97 b are vertically surrounded by the adjacent insertion portions 92.
  • the waffle portion 93 is formed near the center of the outdoor fin 91 in the air flow direction, and includes a raised portion and a non-raised portion in the thickness direction.
  • the upwind fin tab 94a and the downwind fin tab 94b are provided in the vicinity of the upwind end and in the vicinity of the downwind end in order to regulate the distance between the outdoor fins 91, respectively.
  • the outdoor slit 95 is a portion formed by cutting and raising from the flat portion in the plate thickness direction in order to improve the heat transfer performance of the outdoor fin 91, and is formed downstream of the waffle portion 93 in the air flow direction.
  • the outdoor slit 95 is formed such that its longitudinal direction is in the vertical direction (the direction in which the outdoor flat tubes 90 are arranged), and a plurality (two in the present embodiment) is formed in the air flow direction. .
  • These outdoor slits 95 have openings on the upstream side and the downstream side in the air flow direction by being cut and raised from the flat portion to the same side in the plate thickness direction.
  • the windward rib 96a is formed to extend in the air flow direction between the outdoor flat tubes 90 adjacent to each other at the upper and lower sides of the windward fin tab 94a.
  • the downwind side rib 96b is provided so as to extend continuously from the downwind side end of the upwind side rib 96a to the downwind side.
  • FIG. 6 shows an external perspective view of the indoor unit 3.
  • the schematic plan view which shows the state which removed the top plate of the indoor unit 3 in FIG. 7 is shown.
  • FIG. 8 shows a schematic side cross-sectional view of the indoor unit 3 in the cut plane shown by AA in FIG.
  • the indoor unit 3 is an indoor unit of a type installed by being embedded in an opening of a ceiling in a ceiling such as a room which is an air conditioning target space, and constitutes a part of the refrigerant circuit 6.
  • the indoor unit 3 mainly includes an indoor heat exchanger 51, an indoor fan 52, a casing 30, a flap 39, a bell mouth 33, and a drain pan 32.
  • the indoor heat exchanger 51 is a heat exchanger that functions as an evaporator of the refrigerant sent from the indoor heat exchanger 51 during the cooling operation, and functions as a radiator of the refrigerant discharged from the compressor 8 during the heating operation. .
  • the liquid side of the indoor heat exchanger 51 is connected to the indoor side end of the liquid refrigerant communication pipe 4, and the gas side is connected to the indoor side end of the gas refrigerant communication pipe 5.
  • the indoor fan 52 is a centrifugal fan disposed inside the casing main body 31 of the indoor unit 3.
  • the indoor fan 52 sucks indoor air into the casing 30 through the suction port 36 of the decorative panel 35, passes through the indoor heat exchanger 51, and then flows out of the casing 30 through the outlet 37 of the decorative panel 35. (Shown by arrows in FIG. 8).
  • the temperature of the room air supplied by the indoor fan 52 is adjusted by exchanging heat with the refrigerant of the indoor heat exchanger 51.
  • the casing 30 mainly has a casing main body 31 and a decorative panel 35.
  • the casing main body 31 is disposed so as to be inserted into the opening formed in the ceiling U of the air conditioning chamber, and in a plan view, the substantially octagonal box in which long sides and short sides are alternately formed.
  • the lower surface is open.
  • the casing main body 31 has a top plate and a plurality of side plates extending downward from the periphery of the top plate.
  • the decorative panel 35 is disposed so as to be fitted into the opening of the ceiling U, extends outward in plan view than the top plate and the side plate of the casing main body 31, and is attached below the casing main body 31 from the indoor side. .
  • the decorative panel 35 has an inner frame 35a and an outer frame 35b.
  • a substantially rectangular suction port 36 opened downward is formed inside the inner frame 35a.
  • a filter 34 for removing dust in the air sucked from the suction port 36 is provided at the inside of the outer frame 35b and at the outside of the inner frame 35a.
  • an air outlet 37 and a corner air outlet 38 which are opened obliquely downward from below are formed.
  • the blower outlet 37 is provided at a position corresponding to each side of the substantially rectangular shape in plan view of the decorative panel 35, the first blower outlet 37a, the second blower outlet 37b, the third blower outlet 37c, and the fourth blower outlet 37d.
  • the corner air outlet 38 is located at a position corresponding to the substantially square four corners in a plan view of the decorative panel 35, the first corner air outlet 38a, the second corner air outlet 38b, and the third corner air outlet. It has 38c and the 4th corner outlet 38d.
  • the flap 39 is a member capable of changing the direction of the air flow passing through the air outlet 37.
  • the flap 39 includes a first flap 39a disposed at the first outlet 37a, a second flap 39b disposed at the second outlet 37b, a third flap 39c disposed at the third outlet 37c, and a third flap 39c And a fourth flap 39d disposed in the fourth outlet 37d.
  • Each of the flaps 39a to 39d is pivotally supported at a predetermined position of the casing 30.
  • the drain pan 32 is disposed below the indoor heat exchanger 51 and receives drain water generated by condensation of moisture in the air in the indoor heat exchanger 51.
  • the drain pan 32 is attached to the lower portion of the casing main body 31.
  • a cylindrical space extending in the vertical direction is formed inside the indoor heat exchanger 51 in a plan view, and the bell mouth 33 is disposed below the inside of the space.
  • the bell mouth 33 guides the air drawn from the suction port 36 to the indoor fan 52.
  • a plurality of blowout flow paths 47a to 47d and corner blowout flow paths 48a to 48c extending in the vertical direction are formed outside the indoor heat exchanger 51 in plan view.
  • the blowout flow paths 47a to 47d are a first blowout flow path 47a communicating with the first blowout port 37a at the lower end, a second blowout flow path 47b communicating with the second blowout port 37b at the lower end, and a third blowout port at the lower end It has a third blowoff passage 47c in communication with 37c, and a fourth blowout passage 47d in communication with the fourth outlet 37d at the lower end.
  • the corner air outlet flow paths 48a to 48c have a first corner air outlet flow path 48a communicating with the first corner air outlet 38a at the lower end, and a second corner air outlet flow communicating with the second corner air outlet 38b at the lower end.
  • a passage 48b and a third corner outlet channel 48c communicating with the third corner outlet 38c at the lower end are provided.
  • FIG. 9 shows a schematic external perspective view of the indoor heat exchanger 51.
  • FIG. 10 shows a partially enlarged external perspective view of the windward side of the plurality of indoor fins 60 of the indoor heat exchanger 51. As shown in FIG.
  • the indoor heat exchanger 51 is disposed inside the casing main body 31 in a state of being bent so as to surround the periphery at the same height position as the indoor fan 52.
  • the indoor heat exchanger 51 mainly includes a liquid side header 81, a gas side header 71, a return header 59, a plurality of indoor flat tubes 55, and a plurality of indoor fins 60.
  • all of the components constituting the indoor heat exchanger 51 are formed of aluminum or an aluminum alloy, and are joined together by brazing or the like.
  • the indoor heat exchanger 51 includes an upwind heat exchange unit 70 (inside portion in plan view) forming the upwind side in the air flow direction and a downwind heat exchange unit 80 (plan view in the air flow direction). And an outer portion of
  • the liquid side header 81 constitutes one end of the indoor heat exchanger 51 in a plan view of the leeward heat exchange unit 80, and is a cylindrical member extending in the vertical direction.
  • the indoor side end of the liquid refrigerant communication pipe 4 is connected to the liquid side header 81.
  • a plurality of indoor flat tubes 55 constituting the leeward heat exchange section 80 of the indoor heat exchanger 51 are connected to the liquid side header 81 in a row at the top and bottom.
  • the gas side header 71 constitutes one end of the indoor heat exchanger 51 in a plan view of the upwind heat exchange unit 70, and is a cylindrical member extending in the vertical direction.
  • the indoor end of the gas refrigerant communication pipe 5 is connected to the gas side header 71.
  • a plurality of indoor flat tubes 55 which constitute the upwind heat exchange section 70 of the indoor heat exchanger 51 are connected to the gas side header 71 in a line in the vertical direction.
  • the folded header 59 constitutes an end of the indoor heat exchanger 51 opposite to the liquid side header 81 and the gas side header 71 in plan view, and has a plurality of folded spaces arranged in the vertical direction inside. doing. In each of the folded spaces, the indoor flat tube 55 constituting the upwind heat exchange unit 70 provided at the same height position and the indoor flat tube 55 forming the downwind heat exchange unit 80 are connected to each other. ing.
  • the refrigerant flowing through the indoor flat tubes 55 at each height is adjusted to the wind at the same height It becomes possible to return to the indoor flat tube 55 on the upper side (when the indoor heat exchanger 51 functions as an evaporator of the refrigerant) or downwind (when the indoor heat exchanger 51 functions as a radiator of the refrigerant) ing.
  • the plurality of indoor flat tubes 55 one constituting the upwind heat exchange section 70 and one constituting the downwind heat exchange section 80 are provided. That is, in the upwind heat exchange section 70 of the indoor heat exchangers 51, the plurality of indoor flat tubes 55 are arranged side by side in the vertical direction, and the leeward heat exchange section 80 of the indoor heat exchanger 51. , And those arranged side by side in the vertical direction.
  • One end of each of the plurality of indoor flat tubes 55 constituting the upwind heat exchange unit 70 is connected to the gas side header 71, and the other end is connected to the upwind side portion of the folded header 59.
  • One end of each of the plurality of indoor flat tubes 55 constituting the leeward heat exchange unit 80 is connected to the liquid side header 81, and the other end is connected to the leeward side of the folded header 59.
  • the plurality of indoor fins 60 are provided so as to constitute the upwind heat exchange section 70 and to constitute the downwind heat exchange section 80. That is, the plurality of indoor fins 60 are fixed to the indoor flat tube 55 constituting the upwind heat exchange section 70 of the indoor heat exchanger 51, and the downwind of the indoor heat exchanger 51. And the one fixed to the indoor flat tube 55 which constitutes the heat exchange section 80. Each indoor fin 60 is arranged in the thickness direction of the indoor fin 60 so as to be along the indoor flat tube 55.
  • FIG. 11 shows the indoor fin 60 viewed from the direction in which the flow passage 55c extends, with the cross section perpendicular to the direction in which the flow passage 55c in the indoor flat tube 55 extends. The positional relationship with the flat tube 55 is shown.
  • the indoor flat tube 55 includes an upper flat surface 55a which is vertically upward and constitutes an upper surface, a lower flat surface 55b which is vertically downward and constitutes a lower surface, and a large number of small flow paths 55c through which the refrigerant flows. Have.
  • the plurality of flow paths 55c included in the indoor flat tube 55 are provided side by side in the air flow direction (indicated by an arrow in FIG. 11.
  • the longitudinal direction of the indoor flat tube 55 in the flow path cross-sectional view of the flow path 55c).
  • the plurality of indoor flat tubes 55 the same one is used at the height HT in the vertical direction.
  • the height HT refers to the width in the height direction of the upper flat surface 55a and the lower flat surface 55b of the indoor flat tube 55, and is preferably 1.2 mm or more and 2.5 mm or less.
  • the plurality of indoor flat tubes 55 are arranged at a predetermined pitch (step pitch DP) in the vertical direction in the upwind heat exchange unit 70 and the downwind heat exchange unit 80 as well.
  • the step pitch DP is the distance between the upper flat surface 55a of the indoor flat tube 55, and is preferably 8.0 mm or more and 15.0 mm or less.
  • the indoor heat exchanger 51 satisfies the relationship of 4.0 ⁇ DP / HT ⁇ 10.0.
  • the lower limit of DP / HT of the indoor heat exchanger 51 is preferably 4.6 or more, and the upper limit of DP / HT of the indoor heat exchanger 51 is preferably 8.0 or less, It is preferable that the indoor heat exchanger 51 satisfy the relationship of 4.6 ⁇ DP / HT ⁇ 8.0.
  • the value of DP / HT of the indoor heat exchanger 51 satisfies the relationship smaller than the value of DP / HT of the outdoor heat exchanger 11 described above.
  • the indoor flat tube 55 forming the upwind heat exchange unit 70 and the indoor flat tube 55 forming the downwind heat exchange unit 80 overlap each other at each height position in the air flow direction view. It is arranged as.
  • the upstream end portions of the indoor flat tubes 55 in the air flow direction and the upstream end portions of the indoor fins 60 in the air flow direction are substantially the same in the air flow direction. It is provided in the position.
  • the indoor fins 60 are plate-like members that extend in the air flow direction and in the vertical direction, and a plurality of the indoor fins 60 are arranged at predetermined intervals in the plate thickness direction, and are fixed to the indoor flat tube 55.
  • the indoor fins 60 forming the upwind heat exchange unit 70 and the indoor fins 60 forming the downwind heat exchange unit 80 are disposed so as to substantially overlap with each other in the air flow direction view in the present embodiment.
  • the downwind side end of the indoor fin 60 constituting the upwind heat exchange portion 70 and the upwind end portion of the indoor fin 60 constituting the downwind heat exchange portion 80 are arranged to be in contact with each other at least in part. There is.
  • the indoor fins 60 constituting the upwind heat exchange section 70 and the downwind heat exchange section 80, the main surface 61, the plurality of fin collar sections 65a, the indoor communication section 64, the plurality of upwind sections 65 , The main slit 62, the communication position slit 63, and the like.
  • the thickness in the thickness direction of the flat main surface 61 of the indoor fin 60 is, for example, 0.05 mm or more and 0.15 mm or less.
  • the pitch in the thickness direction of the plurality of indoor fins 60 (the distance between the surfaces on the same side of the indoor fins 60 adjacent to each other) is preferably 1.0 mm or more and 1.6 mm or less.
  • the main surface 61 constitutes a flat portion of the indoor fin 60 in which the fin collar portion 65 a, the main slit 62 and the communication position slit 63 are not provided.
  • the fin collar portion 65 a is formed to extend horizontally from the windward edge of the indoor fin 60 toward the windward side to the front of the windward side edge.
  • the plurality of fin collars 65 a are provided to be aligned in the vertical direction.
  • the fin collar portion 65a is formed by burring or the like.
  • the contour shape of the fin collar portion 65a substantially matches the outer shape of the cross section of the indoor flat tube 55, and the fin flat portion 55a is brazed to each other in a state where the indoor flat tube 55 is inserted.
  • FIG. 12 shows a joined state of the indoor fins 60 and the indoor flat tube 55 in a cross section obtained by cutting the flow path 55c of the indoor flat tube 55 along the refrigerant passing direction along a plane including the vertical direction.
  • the fin collar portion 65 a is configured to be raised on the main surface 61 on the opposite side to the cut and raised side of the main slit 62 in the thickness direction of the main surface 61. Further, on the side opposite to the main surface 61 of the fin collar portion 65a, a positioning portion 65x bent so as to extend away from the upper flat surface 55a (or lower flat surface 55b) of the corresponding indoor flat tube 55 It is provided. The positioning portions 65x are in surface contact with the main surfaces 61 of the adjacent indoor fins 60, thereby defining the distance between the indoor fins 60 in the thickness direction.
  • Such a fin collar portion 65a is joined by brazing in a state where the brazing material 58 is interposed between it and the upper flat surface 55a (or lower flat surface 55b) of the indoor flat tube 55, as shown in FIG. There is.
  • a portion where rising of the fin collar portion 65 a with respect to the main surface 61 has started and cut and raised of the main slit 62
  • the distance DS between the point at which is started and 1 mm or less.
  • the dew condensation water on the lower flat surface 55b of the indoor flat tube 55 is led downward through the portion where the cutting and raising of the main slit 62 starts and is drained, so the distance DS is set to a short distance of 1 mm or less Thus, the condensation water can be prevented from being continuously held on the lower flat surface 55b of the indoor flat tube 55.
  • the indoor communication portion 64 is a portion of the indoor fin 60 that is continuous in the vertical direction further on the leeward side than the leeward end of the indoor flat tube 55.
  • the relationship between the width WL in the air flow direction of the indoor communication portion 64 of the indoor fins 60 and the width WF in the air flow direction of the indoor fins 60 is 0.2 ⁇ WL / WF ⁇ 0.5. It is preferable to satisfy
  • the plurality of upwind portions 65 extend from the different height positions of the indoor communication portion 64 toward the upstream side in the air flow direction.
  • Each wind upper portion 65 is vertically surrounded by the adjacent fin collar portions 65a.
  • the vertical length of each wind upper portion 65 is defined by DP-HT.
  • the main slits 62 are portions formed by cutting and raising the flat main surface 61 in the plate thickness direction in order to improve the heat transfer performance of the indoor fins 60, and are formed in the respective wind upper portions 65 of the indoor fins 60. It is done.
  • the main slits 62 are formed such that a plurality (four in the present embodiment) are arranged in the air flow direction.
  • the communication position slit 63 is also a portion cut and raised in the thickness direction from the flat main surface 61 in order to improve the heat transfer performance of the indoor fin 60, and in the indoor communication portion 64 of the indoor fin 60. , Are formed at multiple height positions.
  • the communication position slits 63 are respectively provided on the downstream side of the air flow direction of the main slits 62 provided at each height position.
  • the communication position slit 63 is formed such that its longitudinal direction is vertical, and the upper end is higher than the upper end of the corresponding main slit 62 and the lower end is lower than the lower end of the corresponding main slit 62 It is formed long in the vertical direction.
  • the main slit 62 and the communication position slit 63 are cut and raised from the flat main surface 61 to the same side in the plate thickness direction, and have openings on the upstream side and the downstream side in the air flow direction, respectively.
  • the high-pressure gas refrigerant sent to the outdoor heat exchanger 11 exchanges heat with the outdoor air supplied as a cooling source by the outdoor fan 15 in the outdoor heat exchanger 11 functioning as a refrigerant radiator, and dissipates heat Become a high pressure liquid refrigerant.
  • the high-pressure liquid refrigerant is decompressed to a low pressure in the refrigeration cycle, becomes a gas-liquid two-phase refrigerant, and passes through the liquid side shut-off valve 13 and the liquid refrigerant communication pipe 4 It is sent to the indoor unit 3.
  • the low-pressure gas-liquid two-phase refrigerant exchanges heat with the indoor air supplied as a heating source by the indoor fan 52 in the indoor heat exchanger 51 during the cooling operation to evaporate.
  • the air passing through the indoor heat exchanger 51 is cooled, and the room is cooled.
  • condensation contained in the air passing through the indoor heat exchanger 51 causes condensation water to form on the surface of the indoor heat exchanger 51.
  • the low pressure gas refrigerant evaporated in the indoor heat exchanger 51 is sent to the outdoor unit 2 through the gas refrigerant communication pipe 5.
  • the low-pressure gas refrigerant sent to the outdoor unit 2 is again sucked into the compressor 8 through the gas-side shutoff valve 14, the four-way switching valve 10 and the accumulator 7.
  • the refrigerant circulates through the refrigerant circuit 6 as described above.
  • the connection state of the four-way switching valve 10 is switched so that the outdoor heat exchanger 11 becomes the refrigerant evaporator and the indoor heat exchanger 51 becomes the refrigerant radiator (see FIG. See the dashed line in 1).
  • the low-pressure gas refrigerant in the refrigeration cycle is drawn into the compressor 8 and compressed to a high pressure in the refrigeration cycle and then discharged.
  • the high-pressure gas refrigerant discharged from the compressor 8 is sent to the indoor unit 3 through the four-way switching valve 10, the gas side shut-off valve 14 and the gas refrigerant communication pipe 5.
  • the high-pressure gas refrigerant exchanges heat with the indoor air supplied as a cooling source by the indoor fan 52 in the indoor heat exchanger 51, radiates heat, and becomes a high-pressure liquid refrigerant.
  • the air passing through the indoor heat exchanger 51 is heated, and the room is heated.
  • the high-pressure liquid refrigerant that has dissipated heat by the indoor heat exchanger 51 is sent to the outdoor unit 2 through the liquid refrigerant communication pipe 4.
  • the high-pressure liquid refrigerant sent to the outdoor unit 2 is decompressed to the low pressure of the refrigeration cycle in the outdoor expansion valve 12 through the liquid side shut-off valve 13, and becomes a low-pressure gas-liquid two-phase refrigerant.
  • the low-pressure gas-liquid two-phase refrigerant reduced in pressure by the outdoor expansion valve 12 exchanges heat with outdoor air supplied as a heat source by the outdoor fan 15 in the outdoor heat exchanger 11 functioning as an evaporator of the refrigerant. And evaporate to form a low pressure gas refrigerant.
  • the low pressure gas refrigerant is again sucked into the compressor 8 through the four-way switching valve 10 and the accumulator 7. In the heating operation, the refrigerant circulates through the refrigerant circuit 6 as described above.
  • the heat transfer coefficient of the indoor fins in the indoor heat exchanger can be increased as the interval between the indoor flat tubes is reduced. However, if the interval at which the indoor flat tubes are provided is narrowed, the flow velocity of the air flow passing between the indoor flat tubes is increased, and the condensed water is likely to scatter. Further, also in the case where the height of the indoor flat tube in the vertical direction is large, the flow velocity of the air flow passing between the indoor flat tubes is increased, and the condensed water is likely to scatter.
  • HT is the height of the indoor flat tube 55 in the vertical direction
  • DP is the vertical direction of the indoor flat tubes 55.
  • pitch one satisfying the relationship of 4.0 ⁇ DP / HT ⁇ 10.0 is employed.
  • the heat transfer coefficient of the indoor fins 60 can be reduced by suppressing the region far from the indoor flat tube 55 in the region of the indoor fins 60.
  • the heat transfer coefficient of the indoor fins 60 can be reduced by suppressing the region far from the indoor flat tube 55 in the region of the indoor fins 60.
  • HT is the height of the flat tubes 90 and 55 in the vertical direction
  • DP is the height of the flat tubes 90 and 55.
  • the indoor heat exchanger 51 of the present embodiment includes the upwind heat exchange unit 70 and the downwind heat exchange unit 80, and employs a structure in which at least the indoor flat tubes 55 are arranged in two or more rows.
  • the condensation water generated in the upwind heat exchange unit 70 among the condensation water generated in the indoor heat exchanger 51 is a portion between the upwind heat exchange unit 70 and the downwind heat exchange unit 80 or the downwind heat exchange unit 80 It is easy to guide it down and drain it. Further, the downwind heat exchange unit 80 is supplied with air whose dryness is increased by generating condensation water in the upwind heat exchange unit 70 when passing through the upwind heat exchange unit 70, so that the downwind heat exchange is performed. It is possible to suppress the dew condensation water generated in the portion 80, and to suppress the scattering of the condensation water from the downwind side end portion of the downwind heat exchange unit 80.
  • the indoor fin 60 is provided with the indoor communication portion 64 on the downwind side of the indoor flat tube 55. Therefore, dew condensation water generated in the indoor flat tube 55 can be easily led downward and drained while being transmitted to the indoor communication portion 64 of the indoor fin 60 positioned on the downstream side in the air flow direction. Therefore, it is possible to suppress the scattering of the condensed water from the downstream end of the indoor fin 60 in the air flow direction.
  • the indoor communication portion 64 is provided on the downstream side of the indoor fins 60 of the leeward heat exchange portion 80. It is possible to enhance the drainage property of the generated condensed water while suppressing the generation of the condensed water at the downstream end of the indoor fin 60.
  • the value of WL / WF is 0.5 or less in the indoor fin 60, the area of the indoor fin 60 far from the indoor flat tube 55 and hard to contribute to the improvement of the heat transfer performance is suppressed small. Thus, the material cost can be reduced while maintaining the performance of the indoor fins 60.
  • the value of WL / WF of the indoor fin 60 is 0.2 or more while positioning the indoor communication portion 64 in the indoor fin 60 on the downstream side of the indoor flat tube 55 in the air flow direction. It becomes possible to improve the drainage property via the indoor communication part 64 of the condensation water which arose in the flat pipe 55.
  • the indoor fins 60 are provided with the main slits 62 and the communication position slits 63 which are cut and raised so as to have an opening in the air flow direction. Therefore, the air supplied to the indoor heat exchanger 51 can be in sufficient contact with the indoor fins 60, and the air heat source can be sufficiently used.
  • the upper ends of the main slit 62 and the communication position slit 63 are provided near the lower portion of the indoor flat tube 55 located immediately above, so condensation water generated in the indoor flat tube 55 immediately above It is easy to catch and guide downward, and it is possible to enhance drainage.
  • the portion where the rising of the fin collar portion 65 a with respect to the main surface 61 of the indoor fin 60 starts and the main slit 62 of the indoor fin 60 The retention time of condensation water on the lower flat surface 55b side of the indoor flat tube 55 is suppressed and the drainage performance is enhanced by designing the distance DS between the portion where the cutting and raising has started and the distance DS to be 1 mm or less. Is ready.
  • the shape of the downstream end of the indoor fin 60 is not limited to this, and for example, as described below, a room having a water conducting rib 99 extending along the downstream end in the air flow direction. Fins 60a may be used.
  • FIG. 13 shows the positional relationship between the indoor fin 60a and the indoor flat tube 55
  • FIG. 14 shows the downstream side near the air flow direction in the B-B cross section of the water guide rib 99 in FIG.
  • the upwind heat exchange unit 70 and the downwind heat exchange unit 80 are configured similarly to the above embodiment, and the upwind heat exchange unit 70 and the downwind In each of the indoor fins 60a of the heat exchange unit 80, water guiding ribs 99 extending vertically are provided along the downstream end of the indoor communication portion 64 provided downstream in the air flow direction. .
  • the said water conveyance rib 99 is comprised so that it may be dented in the plate
  • the water conveyance rib 99 is not particularly limited, it is preferable that the water conveyance rib 99 be configured to be recessed by at least the thickness of the indoor fin 60 a.
  • the dew condensation water generated in the indoor heat exchanger 51 is captured by the water guiding rib 99, and the dew condensation water can be easily led downward along the water guiding rib 99. . For this reason, it is possible to suppress the condensation water from reaching the downwind side end of the indoor fin 60a, and to sufficiently suppress the scattering of the condensation water.
  • the water guiding rib 99 is provided on the downstream side of the half of the width in the air flow direction in the indoor communication portion 64 of the indoor fin 60a, and the air flow in the air flow direction of the indoor communication portion 64 More preferably, it is provided within 20% of the downstream end in the direction.
  • the relationship between the width WL in the air flow direction of the indoor communication portion 64 of the indoor fins 60 and the width WF in the air flow direction of the indoor fin 60 is It is preferable to satisfy the relationship of 0.2 ⁇ WL / WF.
  • the indoor heat exchanger 51 includes the upwind heat exchange unit 70 and the downwind heat exchange unit 80, and the indoor flat tubes 55 are provided in two rows as an example.
  • the number of rows aligned in the air flow direction of the indoor flat tubes 55 provided in the indoor heat exchanger 51 is not limited to two, and three or more rows may be provided. By thus increasing the number of rows of the indoor flat tubes 55, it is possible to more effectively suppress the scattering of condensation water from the downstream end of the indoor heat exchanger 51 in the air flow direction.
  • the indoor heat exchanger 51 is not limited to this, and the plurality of indoor flat tubes 55 belonging to the heat exchange section on the windward side and the plurality of indoor flat tubes 55 belonging to the heat exchange section on the windward side And may be disposed so as not to overlap each other in the air flow direction view. As a result, air flow can be sufficiently applied to both the indoor flat tube 55 located on the windward side and the indoor flat tube 55 located on the windward side.
  • the main slit is formed by cutting and raising the entire slit piece on one side in the thickness direction with respect to the main surface 61 of the indoor fin 60
  • the case where the communication position slit 62 and the communication position slit 63 are provided has been described as an example.
  • the cut-and-raised portions formed in the indoor fins 60 are not limited to this, and instead of the main slits 62 and the communication position slit 63, for example, for the slit pieces to be cut and raised, the windward end of the slit pieces in the air flow direction Section on one side of the main surface 61 of the indoor fin 60 in the plate thickness direction, and the leeward end of the slit piece in the air flow direction is on the other side of the main surface 61 of the indoor fin 60 in the plate thickness direction It is also possible to adopt a structure called a louver.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 2016-041986

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Geometry (AREA)
  • Air Filters, Heat-Exchange Apparatuses, And Housings Of Air-Conditioning Units (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Devices For Blowing Cold Air, Devices For Blowing Warm Air, And Means For Preventing Water Condensation In Air Conditioning Units (AREA)
PCT/JP2018/048147 2018-01-22 2018-12-27 室内熱交換器および空気調和装置 WO2019142642A1 (ja)

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CN201880087296.1A CN111630336B (zh) 2018-01-22 2018-12-27 室内热交换器和空调装置
ES18901558T ES2941545T3 (es) 2018-01-22 2018-12-27 Intercambiador de calor interior y dispositivo de acondicionamiento de aire
US16/964,027 US20210041115A1 (en) 2018-01-22 2018-12-27 Indoor heat exchanger and air conditioning apparatus
EP18901558.9A EP3745075B1 (de) 2018-01-22 2018-12-27 Innenraumwärmetauscher und klimatisierungsvorrichtung

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KR20200078936A (ko) * 2018-12-24 2020-07-02 삼성전자주식회사 열 교환기
WO2021234964A1 (ja) * 2020-05-22 2021-11-25 三菱電機株式会社 熱交換器及び空気調和機
JP7457587B2 (ja) * 2020-06-18 2024-03-28 三菱重工サーマルシステムズ株式会社 熱交換器、熱交換器ユニット、及び冷凍サイクル装置
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US20210041115A1 (en) 2021-02-11
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