EP2423609B1 - Wärmetauscher und Klimaanlage, auf der der Wärmetauscher montiert ist - Google Patents

Wärmetauscher und Klimaanlage, auf der der Wärmetauscher montiert ist Download PDF

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Publication number
EP2423609B1
EP2423609B1 EP11177616.7A EP11177616A EP2423609B1 EP 2423609 B1 EP2423609 B1 EP 2423609B1 EP 11177616 A EP11177616 A EP 11177616A EP 2423609 B1 EP2423609 B1 EP 2423609B1
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EP
European Patent Office
Prior art keywords
pipeline
aluminum
heat exchanger
copper
flare
Prior art date
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Application number
EP11177616.7A
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English (en)
French (fr)
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EP2423609A3 (de
EP2423609A2 (de
Inventor
Mitsuhiro Ishikawa
Mitsusada Hayakawa
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Publication date
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Publication of EP2423609A2 publication Critical patent/EP2423609A2/de
Publication of EP2423609A3 publication Critical patent/EP2423609A3/de
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Publication of EP2423609B1 publication Critical patent/EP2423609B1/de
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Classifications

    • 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
    • F24F1/26—Refrigerant piping
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D15/00—Other domestic- or space-heating systems
    • F24D15/04—Other domestic- or space-heating systems using heat pumps
    • 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
    • F24F1/0043—Indoor units, e.g. fan coil units characterised by mounting arrangements
    • F24F1/0057—Indoor units, e.g. fan coil units characterised by mounting arrangements mounted in or on a wall
    • 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
    • F24F1/0063—Indoor units, e.g. fan coil units characterised by heat exchangers by the mounting or arrangement of the heat exchangers
    • 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
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/40—Fluid line arrangements
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
    • F28F21/081—Heat exchange elements made from metals or metal alloys
    • F28F21/084—Heat exchange elements made from metals or metal alloys from aluminium or aluminium alloys
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
    • F28F21/081—Heat exchange elements made from metals or metal alloys
    • F28F21/085—Heat exchange elements made from metals or metal alloys from copper or copper alloys

Definitions

  • the present invention relates to a heat exchanger and an air conditioner on which this heat exchanger is mounted and particularly to a heat exchanger in which a heat transfer pipe is formed of aluminum or aluminum alloy and an air conditioner on which this heat exchanger is mounted.
  • Heat exchangers in which a heat transfer pipe is made of aluminum or aluminum alloy are known.
  • This type of heat exchanger is incorporated in a refrigerating cycle circuit by connecting a refrigerant pipeline formed of copper or copper alloy (hereinafter referred to as a copper pipeline) to a heat transfer pipe formed of aluminum or aluminum alloy (or a refrigerant pipeline formed of aluminum or aluminum alloy connected to this heat transfer pipe.
  • a refrigerant pipeline formed of copper or copper alloy hereinafter referred to as a copper pipeline
  • a heat transfer pipe formed of aluminum or aluminum alloy or a refrigerant pipeline formed of aluminum or aluminum alloy connected to this heat transfer pipe.
  • heat exchangers in which electric corrosion (galvanic corrosion) occurring in the heat transfer pipe or the aluminum pipeline formed of aluminum or aluminum alloy is prevented have been proposed.
  • a heat exchanger made of aluminum for example, a heat exchanger "comprising an air conditioner main body and a fixing member 11 that fixes a refrigerating cycle unit including a compressor, a heat exchanger 6 made of aluminum or aluminum alloy, and a refrigerant pipeline 7 made of copper or copper alloy connected to this heat exchanger 6 to the air conditioner main body, by making all of the parts located at an upper position of the heat exchanger 6 of the refrigerant pipeline 7 be composed of a water droplet falling prevention pipeline portion 9 inclined downward toward the refrigerant pipeline 7 from the heat exchanger 6 so that the droplets flow downward through the pipeline and electric corrosion of the heat exchanger 6 by copper ions is prevented" is proposed (See Japanese Unexamined Patent Application Publication No. 6-300303 (Abstract and Fig. 1 ), for example).
  • KR 2008-0095628 relates to a known air conditioner.
  • connection pipeline (the above-described aluminum pipeline and copper pipeline) of this heat exchanger made of aluminum is twisted to an arbitrary direction in order to connect the heat exchanger made of aluminum to the refrigerating cycle circuit.
  • the present invention was made to solve the above-described problems and an object thereof is to obtain a heat exchanger made of aluminum that can prevent a breakage of a connection pipeline during installation or transfer and an air conditioner on which this heat exchanger is mounted.
  • the invention relates to an air conditioner comprising an indoor unit, an outdoor unit, and an extension pipe connected to the outdoor unit.
  • the indoor unit or outdoor unit comprises a heat exchanger.
  • the heat exchanger comprises a heat transfer pipe formed of aluminum or aluminum alloy, and a connection pipeline through which a refrigerant flowing in from said heat transfer pipe or a refrigerant flowing into said heat transfer pipe passes.
  • the connection pipeline is connected to the extension pipe by a flare-nut connection of the extension pipe and a flare-nut connection portion of the connection pipeline.
  • connection pipeline has a gas pipeline through which a gas refrigerant flows and a liquid pipeline through which a liquid refrigerant or a gas-liquid two-phase refrigerant flows.
  • Each of said gas pipeline and said liquid pipeline is constituted by connecting an aluminum pipeline formed of aluminum or aluminum alloy and a copper pipeline formed of copper and copper alloy using a connection portion.
  • the aluminum pipeline is connected to said heat transfer pipe to form a descending portion descending from said heat transfer pipe.
  • connection portion is arranged in a straight part of said descending portion; and said aluminum pipeline in the straight part of said descending portion is longer than said copper pipeline.
  • connection portion between the first refrigerant pipeline (a refrigerant pipeline formed of aluminum or aluminum alloy) and the second pipeline (a refrigerant pipeline formed of copper or copper alloy) in the connection pipeline is arranged in the straight part of the descending portion.
  • the first refrigerant pipeline is longer than the second refrigerant pipeline.
  • Fig. 1 is an explanatory diagram illustrating an installed state of an air conditioner according to an embodiment of the present invention.
  • the air conditioner according to this embodiment is provided with an indoor unit 100 and an outdoor unit 101.
  • the indoor unit 100 is installed on a wall 111 of an air-conditioned space 110.
  • the outdoor unit 101 is installed outside the room.
  • the indoor unit 100 is provided with a housing 1, a blower 5, an indoor heat exchanger 10 and the like.
  • the housing 1 has a substantially rectangular-solid box shape, and, for example, an inlet 2 is formed on an upper part, and an outlet 3 is formed on a lower part.
  • a filter 2a that collects dust and the like from indoor air sucked into the housing 1 is disposed.
  • an air-direction adjustment mechanism 4 that adjusts the direction of air-conditioning air blown out of the outlet 3 is disposed.
  • the blower 5 is a cross-flow fan, for example, and is disposed within the housing 1. Also, the indoor heat exchanger 10 is arranged so as to cover a front face portion, a top face portion, and an upper part of a rear face portion of this blower 5.
  • the indoor heat exchanger 10 is a fin-tube-type heat exchanger. Also, in this embodiment, the indoor heat exchanger 10 is constituted by a plurality of heat exchangers 10a, each using a circular-pipe-shaped heat transfer pipe 12, and a plurality of heat exchangers 10b, each using a flat-pipe-shaped heat transfer pipe 16.
  • the heat exchangers 10a are provided with a plurality of fins 11, each formed of aluminum or aluminum alloy and the plurality of heat transfer pipes 12 (each having a circular-tube shape), each formed of aluminum or aluminum alloy.
  • the fins 11 are layered at predetermined intervals, and the heat transfer pipes 12 (each having a circular-tube shape) are disposed so as to extend through these fins 11.
  • the heat exchangers 10b are provided with a plurality of fins 15 formed of aluminum or aluminum alloy and the plurality of the heat transfer pipes 16 (each having a flat-tube shape), each formed of aluminum or aluminum alloy.
  • the fins 15 are layered at predetermined intervals, and the heat transfer pipes 16 (each having a flat-tube shape) are disposed so as to extend through these fins 15
  • the indoor heat exchanger 10 is formed such that the heat exchangers 10a using the circular-pipe-shaped heat transfer pipes 12 are arranged on the upstream side of an air path and the heat exchangers 10b using the flat-pipe-shaped heat transfer pipes 16 are arranged on the downstream side of the air path.
  • the indoor heat exchanger 10 has a configuration that can be thermally divided into two parts (between the heat exchangers 10a and the heat exchangers 10b, for example), and a decompressing device 8 for re-heating and dehumidifying (an expansion valve, for example) is connected between the heat exchangers thermally divided into two parts.
  • a part of the indoor heat exchanger 10 can be made to function as a condenser during a cooling operation, for example, and the remaining part of the indoor heat exchanger 10 can be made to function as an evaporator.
  • This indoor heat exchanger 10 is provided with a connection pipeline 20. That is, one of the ends of the connection pipeline 20 is connected to the heat transfer pipe (at least either of the heat transfer pipe 12 and the heat transfer pipe 16) of the indoor heat exchanger 10.
  • This connection pipeline 20 is a pipeline formed of copper or copper alloy and is pulled to the outside of the room through a hole portion 112 formed in the wall 111.
  • a flare-nut connection portion 29 is disposed on the other end of the connection pipeline 20, .
  • the indoor heat exchanger 10 is connected to constituent elements (such as a compressor, an outdoor heat exchanger and the like, not shown) of the refrigerating cycle circuit disposed in the indoor unit 101, thus forming a refrigerating cycle circuit.
  • constituent elements such as a compressor, an outdoor heat exchanger and the like, not shown
  • connection pipeline 20 is constituted by two pipelines (a gas pipeline 30 and a liquid pipeline 40).
  • the flare-nut connection portion 29 is also constituted by two flare-nut connection portions (a flare-nut connection portion 39 of the gas pipeline 30 and a flare-nut connection portion 49 of the liquid pipeline 40).
  • the extension pipeline 50 is also constituted by two pipelines, and the flare-nut connection portion 51 of the extension pipeline 50 is also constituted by two flare-nut connection portions.
  • connection pipeline 20 Details of the connection pipeline 20 will be described.
  • Figs. 2A and 2B are perspective views illustrating a heat exchanger according to the embodiment of the present invention. Also, Fig. 3 is a front view (enlarged view of an essential part) illustrating this heat exchanger, and Fig. 4 is a side view illustrating this heat exchanger.
  • Fig. 2A and Fig. 2B are separate diagrams used to explain the gas pipeline 30 and the liquid pipeline 40 and they are the same except for the reference numerals used. By using Figs. 2A to 4 , details of the connection pipeline 20 according to this embodiment will be described.
  • connection pipeline 20 is provided with the gas pipeline 30 and the liquid pipeline 40.
  • the gas pipeline corresponds to a first refrigerant pipeline in the present invention
  • the liquid pipeline corresponds to a second refrigerant pipeline in the present invention.
  • the gas pipeline 30 is a refrigerant pipeline through which mainly a gas refrigerant flows.
  • a cooling operation if the indoor heat exchanger 10 functions as an evaporator
  • the refrigerant flowing through heat transfer pipes 12 and 16 of the indoor heat exchanger 10 flows out of the indoor unit 100 through the gas pipeline 30.
  • a heating operation if the indoor heat exchanger 10 functions as a condenser
  • the refrigerant flowing through the heat transfer pipes 12 and 16 of the indoor heat exchanger 10 flows thereinto through the gas pipeline 30.
  • the liquid pipeline 40 is a refrigerant pipeline through which mainly a liquid refrigerant flows.
  • a cooling operation when the indoor heat exchanger 10 functions as an evaporator, the refrigerant flowing through heat transfer pipes 12 and 16 of the indoor heat exchanger 10 flows thereinto through the liquid pipeline 40.
  • a heating operation if the indoor heat exchanger 10 functions as a condenser, the refrigerant having flowed through the heat transfer pipes 12 and 16 of the indoor heat exchanger 10 flows out of the indoor unit 100 through the liquid pipeline 40.
  • the refrigerant having flowed through a decompressing device which is a constituent element of the refrigerating cycle circuit, might flow through the liquid pipeline 40.
  • the refrigerant flowing through the liquid pipeline 40 is a liquid-rich gas-liquid two-phase refrigerant.
  • the gas pipeline 30 is constituted by an aluminum pipeline 31 formed of aluminum or aluminum alloy and a copper pipeline 32 formed of copper or copper alloy.
  • the liquid pipeline 40 is constituted by an aluminum pipeline 41 formed of aluminum or aluminum alloy and a copper pipeline 42 formed of copper or copper alloy. That is because of the following reasons.
  • the flare-nut connection portions that connect the extension pipeline 50, which has two pipelines, to the gas pipeline 30 and the liquid pipeline 40 have female screw portions disposed on pipelines (the extension pipeline 50, for example) and male screw portions disposed on the other pipelines (the gas pipeline 30 and the liquid pipeline 40, for example), which are connected respectively.
  • Each of the female screw portions has a female screw formed on the inner face thereof, and a through hole communicating with a space where this female screw is formed is formed.
  • One of the pipelines (the extension pipeline 50, for example) has the diameter of the end portion thereof expanded by flare working and is inserted into this through hole.
  • the male screw portion disposed on each of the other pipelines (the gas pipeline 30 and the liquid pipeline 40, for example) is attached to the pipeline end portion by brazing.
  • the flare-worked end portion of each of the pipelines (the extension pipeline 50, for example) is sandwiched between the female screw portion and the male screw portion, and the extension pipeline 50, which has two pipelines, is connected to the gas pipeline 30 and the liquid pipeline 40.
  • the male screw portion and the female screw portion are formed of brass, considering workability, brazing performances with the copper pipeline and the like,
  • the gas pipeline 30 is formed only by the aluminum pipeline 31, and the flare-nut connection portion 39 of the gas pipeline 30 is made to be a male screw portion made of brass, for example, brazing between the aluminum pipeline 31 and the flare-nut connection portion 39 becomes difficult. Also, since the aluminum pipeline 31 and the flare-nut connection portion 39 are metals that are different from each other, electric corrosion (galvanic corrosion) as will be described later might occur at the connection portion between both metals.
  • the gas pipeline 30 is formed only by the aluminum pipeline 31 and the flare-nut connection portion 39 of the gas pipeline 30 is made to be a female screw portion made of brass, for example, since the aluminum pipeline 31 and the flare-nut connection portion 39 are metals that are different from each other, electric corrosion (galvanic corrosion) as will be described later might occur at the connection portion between both metals.
  • the gas pipeline 30 is formed only by the aluminum pipeline 31, and if the flare-nut connection portion 39 of the gas pipeline 30 is made to be a male screw portion made of aluminum or aluminum alloy, for example, the strength of the thread of the flare-nut connection portion 39 becomes insufficient. Also, at this time, since the flare-nut connection portion 51 of the extension pipeline 50, which is a copper pipeline, is a female screw portion made of brass, electric corrosion (galvanic corrosion) as will be described later might occur between the flare-nut connection portion 39 of the gas pipeline 30 and the flare-nut connection portion 51 of the extension pipeline 50.
  • the gas pipeline 30 is formed only by the aluminum pipeline 31, and if the flare-nut connection portion 39 of the gas pipeline 30 is made to be a female screw portion made of aluminum or aluminum alloy, for example, the strength of the thread of the flare-nut connection portion 39 becomes insufficient. Also, when the distal end portion of the aluminum pipeline 31 is to be flare-worked, the occurrence of cracking at the distal end portion of the aluminum pipeline 31 becomes a concern. Also, since the flare-nut connection portion 51 of the extension pipeline 50, which is a copper pipeline, is a male screw portion made of brass, electric corrosion (galvanic corrosion) as will be described later might occur at the connection portion between the flare-nut connection portion 39 of the gas pipeline 30 and the flare-nut connection portion 51 of the extension pipeline 50.
  • the gas pipeline 30 is formed only by the aluminum pipeline 31 and the flare-nut connection portion 39 of the gas pipeline 30 and the flare-nut connection portion 51 of the extension pipeline 50 are formed of aluminum or aluminum alloy, for example, the strength of the threads of the flare-nut connection portion 39 and the flare-nut connection portion 51 becomes insufficient. Also, if the flare-nut connection portion 39 of the gas pipeline 30 is made to be a female screw portion, when the distal end portion of the aluminum pipeline 31 is to be flare-worked, the occurrence of cracking at the distal end portion of the aluminum pipeline 31 becomes a concern.
  • extension pipeline 50 in order to prevent electric corrosion (galvanic corrosion) as will be described later in the connection portion between the extension pipeline 50 and the flare-nut connection portion 51, it is necessary to form the extension pipeline 50 out of aluminum or aluminum alloy.
  • the flare-nut connection portion 51 of the extension pipeline 50 is made to be a female screw portion, when the distal end portion of the extension pipeline 50 is to be flare-worked, the occurrence of cracking at the distal end portion of the extension pipeline 50 becomes a concern.
  • the gas pipeline 30 is constituted by the aluminum pipeline 31 and the copper pipeline 32. That is, a flare-nut connection portion 39 made of brass, which is a male screw portion or a female screw portion, is disposed in the distal end portion of the copper pipeline 32 so as to prevent the thread from having insufficient strength or the occurrence of cracking in the pipeline distal end portion during the flare-working, which is a concern.
  • the liquid pipeline 40 is constituted by the aluminum pipeline 41 and the copper pipeline 42, and the flare-nut connection portion 49 made of brass, which is a male screw portion or a female screw portion, is disposed in the distal end portion of the copper pipeline 42 so as to prevent the thread from having insufficient strength or the occurrence of cracking in the pipeline distal end portion during the flare-working, which is a concern.
  • connection portion 37 between the aluminum pipeline 31 and the copper pipeline 32 is connected by eutectic bonding.
  • an end portion on the side opposite the connection portion 37 of the aluminum pipeline 31 is connected to the heat transfer pipe 12 or the heat transfer pipe 16 by brazing, for example.
  • a connection portion 47 between the aluminum pipeline 41 and the copper pipeline 42 is connected by eutectic bonding.
  • an end portion on the side opposite the connection portion 47 of the aluminum pipeline 41 is connected to the heat transfer pipe 12 or the heat transfer pipe 16 by brazing, for example.
  • connection portions 37 and 47 of the aluminum pipelines 31 and 41 and the copper pipelines 32 and 42 are illustrated in Fig. 6 . That is, the distal end portions of the copper pipelines 32 and 42 are inserted into the distal end portions of the aluminum pipelines 31 and 41. Then, the both connection portions are eutectic bonded (bonding by forming eutectic alloy by bringing the metals into contact at a certain temperature). If water adheres to the connection portions 37 and 47, electric corrosion (galvanic corrosion) occurs in the connection portions 37 and 47 (or in more detail, a portion made of aluminum or aluminum alloy) due to the principle, which will be described later. Thus, in order to make the connection portions 37 and 47 waterproof, it is desirable that the connection portions 37 and 47 are covered by a heat shrinkable tube or the connection portions 37 and 47 are painted.
  • the gas pipeline 30 and the liquid pipeline 40 are formed in the form as described below.
  • a descending portion 33 where the gas pipeline 30 is arranged substantially in the perpendicular direction is formed in the gas pipeline 30.
  • the descending portion 33 is formed of an upper curved portion 34, a straight portion 35, and a lower curved portion 36.
  • the upper part of the descending portion 33 is the aluminum pipeline 31, and the lower part of the descending portion 33 is the copper pipeline 32.
  • the connection portion 37 between the aluminum pipeline 31 and the copper pipeline 32 is arranged in the straight portion 35 of the descending portion 33
  • a descending portion 43 where the liquid pipeline 40 is arranged substantially in the perpendicular direction is formed in the liquid pipeline 40.
  • the descending portion 43 is formed of an upper curved portion 44, a straight portion 45, and a lower curved portion 46.
  • an upper part of the descending portion 43 is the aluminum pipeline 41
  • a lower part of the descending portion 43 is the copper pipeline 42.
  • the connection portion 47 between the aluminum pipeline 41 and the copper pipeline 42 is arranged in the straight portion 45 of the descending portion 43.
  • the copper pipelines 32 and 42 are arranged in the lower part in the gravity direction than the aluminum pipelines 31 and 41.
  • the adhesion of water adhering to the copper pipelines 32 and 42 to the aluminum pipelines 31 and 41 can be prevented, and the occurrence of electric corrosion (galvanic corrosion) in the aluminum pipelines 31 and 41 can be prevented.
  • the descending portions 33 and 43 are arranged substantially in the perpendicular direction, but it is needless to say that the descending portions 33 and 43 may be arranged diagonally. That is, it is only necessary that in the descending portions 33 and 43, the copper pipelines 32 and 42 are arranged in the lower part in the gravity direction than the aluminum pipelines 31 and 41.
  • the connection portion 37 of the aluminum pipeline 31 with the copper pipeline 32 is arranged above the upper end portion of the spring 60.
  • the spring 60 is disposed only on the gas pipeline 30. That is because the gas pipeline 30 is more easily crushed than the liquid pipeline 40 since the pipe diameter of the gas pipeline 30 is larger than that of the liquid pipeline 40.
  • the gas pipeline 30 is formed by connecting the aluminum pipeline 31 of ⁇ 9.52 mm ⁇ t1.0 mm and the copper pipeline 32 of ⁇ 9.52 mm ⁇ t0.8 mm.
  • the liquid pipeline 40 is formed by connecting the aluminum pipeline 41 of ⁇ 7.00 mm ⁇ t0.75 mm and the copper pipeline 42 of ⁇ 7.00 mm ⁇ t0.60 mm.
  • the spring 60 is not disposed on the liquid pipeline 40, but it is desirable that the connection portion 47 of the liquid pipeline 40 (the connection portion between the aluminum pipeline 41 and the copper pipeline 42) is arranged above the upper end portion of the spring 60. This is because the liquid pipeline 40 and the gas pipeline 30 are disposed close to each other in many cases.
  • the connection portion 47 of the liquid pipeline 40 above the upper end portion of the spring 60, the spring 60 is no longer brought into contact with the aluminum pipeline 41, and the adhesion of water adhering to the spring 60 to the aluminum pipeline 41 can be prevented, and the occurrence of electric corrosion (galvanic corrosion) in the aluminum pipeline 41 can be prevented.
  • the gas pipeline 30 and the liquid pipeline 40 are formed in the shapes described below.
  • connection pipeline 20 (the gas pipeline 30 and the liquid pipeline 40) is pulled to the outside through the hole portion 112 in the wall 111.
  • the position of the hole portion 112 in the wall 111 and the installation position of the indoor unit 100 are different depending on installation environment.
  • the gas pipeline 30 and the liquid pipeline 40 should be able to be twisted in a desired direction within a range of approximately 180° around the descending portions 33 and 43 as illustrated in Fig. 5 (plan view).
  • twisting deformation occurs in the descending portions 33 and 43 by a twisting moment applied to them. Because of this twisting deformation, leakage of a refrigerant caused by a breakage or the occurrence of refrigerant pressure loss caused by a pipeline being crushed is a concern in the descending portions 33 and 43.
  • a length L1 of the aluminum pipeline 31 is set longer than a length L2 of the copper pipeline 32 as illustrated in Fig. 2A .
  • a length L3 of the aluminum pipeline 41 is set longer than a length L4 of the copper pipeline 42.
  • the aluminum pipelines 31 and 41 have lower resistance to a twisting moment than the copper pipelines 32 and 42.
  • the aluminum pipelines 31 and 41 are more easily deformed than the copper pipelines 32 and 42. Therefore, by setting the ratios of the aluminum pipelines 31 and 41 which are easily deformed to be larger than those of the copper pipelines 32 and 42, a twisting angle per unit length of each of the aluminum pipelines 31 and 41 can be made small.
  • the portions of aluminum pipelines 31 and 41 in the straight portions 35 and 45 can flexibly respond to the applied twisting moment. That is, breakage (cracking, crushing or the like) in the portions of the aluminum pipelines 31 and 41 in the strait portions 35 and 45 can be prevented, and the occurrence of leakage of the refrigerant and refrigerant pressure loss can be prevented.
  • the copper pipelines 32 and 42 have higher resistance to the twisting moment larger than those of the aluminum pipelines 31 and 41, deformation amounts in the portions of the copper pipelines 32 and 42 in the straight portions 35 and 45 are smaller. Thus, the portions of the copper pipelines 32 and 42 in the straight portions 35 and 45 are hardly broken (cracking, crushing or the like).
  • the twisting angle per unit length becomes large.
  • the portions of the aluminum pipelines 31 and 41 in the descending portions 33 and 43 leakage of the refrigerant caused by a breakage or the occurrence of refrigerant pressure loss caused by a pipeline being crushed is a concern.
  • the relative strength of the aluminum pipelines 31 and 41 can be improved with respect to the copper pipelines 32 and 42, but this method is not preferable. If the thickness of each of the aluminum pipelines 31 and 41 is increased, for example, an increase in the pressure loss in the aluminum pipelines 31 and 41 lowers the refrigerating cycle efficiency or raises the cost of the indoor heat exchanger 10. On the contrary, if the thickness of each of the copper pipelines 32 and 42 is decreased, the withstanding pressure or corrosion margin becomes insufficient.
  • the length L1 of the aluminum pipeline 31 is made larger than the length L2 of the copper pipeline 32.
  • the length L3 of the aluminum pipeline 41 is set larger than the length L4 of the copper pipeline 42.
  • the twisting angle which results in a breakage can be made larger, and a breakage of the connection pipeline 20 (the gas pipeline 30 and the liquid pipeline 40) can be prevented more effectively.
  • a material which stretches well from copper or copper alloy for the materials of the copper pipelines 32 and 42 the twisting angle which results in a breakage can be made larger, and a breakage of the connection pipeline 20 (the gas pipeline 30 and the liquid pipeline 40) can be prevented more effectively.
  • A3003-0 which stretches well, is used for the materials of the aluminum pipelines 31 and 41.
  • C1220-0 which stretches well, is used.
  • A3003-0 has stretch of 23% or more in a plate-shaped sample having the thickness of 0.8 to 1.3 mm.
  • C1220-0 has stretch of 35% or more in a plate-shaped sample having the thickness of 0.3 to 30 mm.
  • the heat exchanger according to the present invention is mounted on the indoor unit 100
  • the heat exchanger according to the present invention may be mounted on an outdoor heat exchanger. That is, in this embodiment, the example in which the heat exchanger according to the present invention is used as the indoor heat exchanger 10 has been described, but it is needless to say that the heat exchanger according to the present invention may be used as an outdoor heat exchanger.
  • the circular-pipe-shaped heat transfer pipe 12 and the flat-pipe-shaped heat transfer pipe 16 are both used in the indoor heat exchanger 10, but only either of them may be used.
  • the present invention has been described using a fin-tube-type heat exchanger (indoor heat exchanger 10) as an example, but it is needless to say that the present invention can be applied to various types of heat exchangers. That is, the present invention can be put into practice by connecting the gas pipeline 30 and the liquid pipeline 40 described in this embodiment to a heat exchanger provided with a heat transfer pipe formed of aluminum or aluminum alloy.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Air Filters, Heat-Exchange Apparatuses, And Housings Of Air-Conditioning Units (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Claims (3)

  1. Klimaanlage mit einer Innenraumeinheit (100) und einer Außenraumeinheit (101), und einem Verlängerungsrohr (50), das mit der Außenraumeinheit (101) verbunden ist, wobei die Innenraumeinheit (100) oder die Außenraumeinheit (101) einen Wärmetauscher (10) aufweist, wobei der Wärmetauscher (10) aufweist:
    ein Wärmeübertragungsrohr (12), das aus Aluminium oder einer Aluminiumlegierung ausgebildet ist; und
    eine Verbindungsrohrleitung (20), durch welche ein Kältemittel, das aus dem Wärmeübertragungsrohr (12) einströmt, oder ein Kältemittel, das in das Wärmeübertragungsrohr (12) strömt, verläuft, wobei:
    die Verbindungsrohrleitung (20) eine Gasrohrleitung (30), durch welche ein Gaskältemittel strömt, und eine Flüssigkeitsrohrleitung (40) aufweist, durch welche ein flüssiges Kältemittel oder ein Gas-Flüssigkeits-Zweiphasenkältemittel strömt;
    jede der Gasrohrleitung (30) und der Flüssigkeitsrohrleitung (40) gebildet ist, indem eine Aluminiumrohrleitung (31,41), die aus Aluminium oder einer Aluminiumlegierung ausgebildet ist, und eine Kupferrohrleitung (32,42), die aus Kupfer und einer Kupferlegierung ausgebildet ist, unter Verwendung eines Verbindungsabschnitts (37,47) verbunden wird;
    der Verbindungsabschnitt (37,47) in einem geraden Teil von einem abfallenden Abschnitt (33,43), der von dem Wärmeübertragungsrohr (12) abfällt, angeordnet ist; und
    die Aluminiumrohrleitung (31,41) in dem geraden Teil des abfallenden Abschnitts (33,43) länger als die Kupferrohrleitung (32,42) ist,
    dadurch gekennzeichnet, dass
    die Aluminiumrohrleitung (31,41) mit dem Wärmeübertragungsrohr (12) verbunden ist, um den abfallenden Abschnitt (33,43), der von dem Wärmeübertragungsrohr (12) abfällt, auszubilden;
    die Verbindungsrohrleitung (20) mit dem Verlängerungsrohr (50) durch eine Bördelmuttern-Verbindung (51) des Verlängerungsrohrs (50) und einen Bördelmuttern-Verbindungsabschnitt (29) der Verbindungsrohrleitung (20) verbunden ist.
  2. Klimaanlage nach Anspruch 1, wobei
    eine Feder (60), die eine Verformung der Gasrohrleitung (30) unterdrückt, einen unteren Teil des abfallenden Abschnitts (33) der Gasrohrleitung (30) abdeckt; und
    in einem Zustand, in welchem die Klimaanlage mit dem Wärmetauscher (10) installiert ist, der Verbindungsabschnitt (37,47) über einem oberen Endabschnitt der Feder (60) angeordnet ist.
  3. Klimaanlage nach Anspruch 2, wobei
    in dem Zustand, in welchem die Klimaanlage mit dem Wärmetauscher (10) installiert ist, der Verbindungsabschnitt (47) der Flüssigkeitsrohrleitung (40) über dem oberen Endabschnitt der Feder (60), der die Gasrohrleitung (30) abdeckt, angeordnet ist.
EP11177616.7A 2010-08-23 2011-08-16 Wärmetauscher und Klimaanlage, auf der der Wärmetauscher montiert ist Active EP2423609B1 (de)

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EP2423609A3 (de) 2016-11-09
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EP2423609A2 (de) 2012-02-29
CN102374592B (zh) 2014-05-07
JP2012042169A (ja) 2012-03-01

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