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JP2009250562A - Heat exchanger - Google Patents

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JP2009250562A
JP2009250562A JP2008101220A JP2008101220A JP2009250562A JP 2009250562 A JP2009250562 A JP 2009250562A JP 2008101220 A JP2008101220 A JP 2008101220A JP 2008101220 A JP2008101220 A JP 2008101220A JP 2009250562 A JP2009250562 A JP 2009250562A
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heat transfer
transfer tube
aluminum
tube
core material
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Shoichi Yokoyama
昭一 横山
Tomoaki Ando
智朗 安藤
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Panasonic Corp
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Panasonic Corp
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    • 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
    • F28F1/40—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only inside the tubular element
    • 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
    • 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

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

【課題】オールアルミニウム製の熱交換器において、伝熱管の接触腐食による孔食の発生を抑制するとともに、高い熱交換能力を得ることを目的とする。
【解決手段】プレートフィン１の材質はアルミニウムまたはアルミニウム合金とし、伝熱管２は材質がアルミニウムまたはアルミニウム合金の円筒状の芯材２１の外面を、芯材２１より腐食電位が卑な材質のアルミニウム合金で被覆したアルミニウムクラッド管を用い、アルミニウムクラッド管の伝熱管２の内面には伝熱管２の長手方向と角度をなす方向に延びる複数の微細な突起状フィン２３を形成する。
【選択図】図２An object of the present invention is to suppress the occurrence of pitting corrosion due to contact corrosion of a heat transfer tube and obtain a high heat exchange capability in a heat exchanger made of all aluminum.
A plate fin is made of aluminum or an aluminum alloy, and a heat transfer tube is made of an aluminum alloy having a lower corrosion potential than the core material on the outer surface of a cylindrical core material made of aluminum or aluminum alloy. A plurality of fine projection fins 23 extending in a direction that forms an angle with the longitudinal direction of the heat transfer tube 2 are formed on the inner surface of the heat transfer tube 2 of the aluminum clad tube.
[Selection] Figure 2

Description

本発明は、ルームエアコン、パッケージエアコン、カーエアコン、ヒートポンプ式給湯機、冷蔵庫、冷凍庫などに用いられる熱交換器に関するものである。   The present invention relates to a heat exchanger used for a room air conditioner, a packaged air conditioner, a car air conditioner, a heat pump type water heater, a refrigerator, a freezer and the like.

従来、この種のオールアルミニウム製の熱交換器の伝熱管として、図４に示すように、特許文献１に記載されているＪＩＳで規定される１０００系の純アルミニウムや３０００系のＡｌ−Ｍｎ系合金など一種類の材質の円筒状伝熱管１２１の内面に、押出し加工時形成される管の長手方向に平行な拡管用の突起状フィン１２４と、拡管用の突起状フィンよりも高さが低く管の長手方向に平行な放熱用の突起状フィン１２２および、拡管用フィン１２４と放熱用フィン１２２に挟まれた管の長手方向に平行なフィン溝１２３を有するものを用い、またプレートフィンとしては、リサイクル性の観点から前記伝熱管の材質に近いアルミニウムまたはアルミニウム合金が用いられることが多い（例えば、特許文献１参照）。   Conventionally, as a heat transfer tube of this type of all-aluminum heat exchanger, as shown in FIG. 4, 1000 series pure aluminum or 3000 series Al—Mn system defined by JIS described in Patent Document 1 On the inner surface of the cylindrical heat transfer tube 121 made of one kind of material such as an alloy, a protruding fin 124 for expanding the tube parallel to the longitudinal direction of the tube formed during extrusion, and a height lower than the protruding fin for expanding the tube. A fin having a fin fin 123 for heat dissipation parallel to the longitudinal direction of the tube and a fin groove 123 parallel to the longitudinal direction of the tube sandwiched between the fin for expanding pipe 124 and the fin for heat dissipation 122 is used as a plate fin. From the viewpoint of recyclability, aluminum or an aluminum alloy close to the material of the heat transfer tube is often used (for example, see Patent Document 1).

また図５に示すように、特許文献２に記載されている円筒状の芯材２１２の外面に、芯材より腐食電位が卑な材質で被覆した被覆層２１０を有するアルミニウムクラッド管は、熱交換器の伝熱管として用いられることはないが、耐食性を必要とする配管用のアルミニウム管として用いられている（例えば、特許文献２参照）。
特開２００１−２８９５８５号公報 特許第２６３５７６９号公報 Further, as shown in FIG. 5, an aluminum clad tube having a coating layer 210 covered with a material whose corrosion potential is lower than that of the core material on the outer surface of the cylindrical core material 212 described in Patent Document 2 is heat exchange. Although it is not used as a heat transfer tube of a vessel, it is used as an aluminum tube for piping that requires corrosion resistance (see, for example, Patent Document 2).
JP 2001-289585 A Japanese Patent No. 2635769

しかしながら、前記従来の特許文献１に記載されている構成では、伝熱管の内面の突起状フィン１２２，１２４は押出し加工時形成されるので伝熱管１２１の長手方向に平行なため、伝熱管の内部を流れる流体の螺旋流れを誘起できないため、伝熱性能の向上があまり大きくは期待できず、また、流通抵抗も大きくなるので伝熱管１２１の外部のプレートフィン群の間を流れる気体との温度差を小さくし、熱交換能力を低下させる要因となっている。また、熱交換器の設置環境によってはアルミニウム管がアルミニウムより腐食電位が貴な異種金属のイオンを含む水に濡れ、接触腐食による孔食が発生する恐れがある。   However, in the configuration described in Patent Document 1 above, the protruding fins 122 and 124 on the inner surface of the heat transfer tube are formed at the time of extrusion, and are therefore parallel to the longitudinal direction of the heat transfer tube 121. Since the spiral flow of the fluid flowing through the tube cannot be induced, the improvement in heat transfer performance cannot be expected to be so great, and the flow resistance is also increased, so the temperature difference from the gas flowing between the plate fin groups outside the heat transfer tube 121 This is a factor that reduces the heat exchange capacity. Further, depending on the installation environment of the heat exchanger, the aluminum tube may get wet with water containing ions of different metals having a corrosion potential higher than that of aluminum, and pitting corrosion due to contact corrosion may occur.

また、特許文献２に記載されているアルミニウムクラッド管は、耐食性を有しているが内面が平滑なため伝熱性能が悪いので、配管に用いられてはいるが、高性能が求められる熱交換器の伝熱管としては用いることができない。   In addition, the aluminum clad tube described in Patent Document 2 has corrosion resistance, but its heat transfer performance is poor because the inner surface is smooth, so it is used for piping, but heat exchange that requires high performance is required. It cannot be used as a heat transfer tube for a vessel.

本発明は、上記課題を解決するために、プレートフィンの材質はアルミニウムまたはアルミニウム合金とし、伝熱管は材質がアルミニウムまたはアルミニウム合金の円筒状芯材の外面に芯材より腐食電位が卑な材質のアルミニウム合金で被覆した被覆層を有するアルミニウムクラッド管を用い、アルミニウムクラッド管の前記伝熱管の内面には前記伝熱管の長手方向と角度をなす方向に延びる複数の微細な突起状のフィンを形成する。その結果、オールアルミニウム製の熱交換器は耐食性を有する伝熱管に孔食が発生することがほとんどなく、また伝熱管の内面の長手方向と角度をなす方向に延びる複数の微細な突起状のフィンにより高い熱交換能力を得ることができる。   In the present invention, in order to solve the above-mentioned problems, the material of the plate fin is aluminum or aluminum alloy, and the heat transfer tube is made of a material whose corrosion potential is lower than that of the core material on the outer surface of the cylindrical core material made of aluminum or aluminum alloy. An aluminum clad tube having a coating layer coated with an aluminum alloy is used, and a plurality of fine projecting fins extending in an angle with the longitudinal direction of the heat transfer tube are formed on the inner surface of the heat transfer tube of the aluminum clad tube. . As a result, the all-aluminum heat exchanger hardly causes pitting corrosion in the heat transfer tube having corrosion resistance, and has a plurality of fine protruding fins extending in a direction that forms an angle with the longitudinal direction of the inner surface of the heat transfer tube. A higher heat exchange capacity can be obtained.

前記従来の課題を解決するため、プレートフィンの材質はアルミニウムまたはアルミニ
ウム合金とし、伝熱管は材質がアルミニウムまたはアルミニウム合金の円筒状芯材の外面に芯材より腐食電位が卑な材質のアルミニウム合金で被覆した被覆層を有するアルミニウムクラッド管を用い、アルミニウムクラッド管の前記伝熱管の内面には前記伝熱管の長手方向と角度をなす方向に延びる複数の微細な突起状のフィンを形成するもので、この構成によって、オールアルミニウム製の熱交換器は耐食性を有する伝熱管に孔食が発生することがほとんどなく、また伝熱管の内面の長手方向と角度をなす方向に延びる複数の微細な突起状のフィンにより高い熱交換能力を得ることができる。 In order to solve the above conventional problems, the plate fin is made of aluminum or aluminum alloy, and the heat transfer tube is made of aluminum or aluminum alloy having a lower corrosion potential than the core on the outer surface of the aluminum or aluminum alloy cylindrical core. Using an aluminum clad tube having a coated layer, a plurality of fine projection-like fins extending in a direction that forms an angle with the longitudinal direction of the heat transfer tube are formed on the inner surface of the heat transfer tube of the aluminum clad tube. With this configuration, the all-aluminum heat exchanger has almost no pitting corrosion on the heat transfer tube having corrosion resistance, and has a plurality of fine protrusions extending in a direction that forms an angle with the longitudinal direction of the inner surface of the heat transfer tube. High heat exchange capability can be obtained by the fins.

以上のように、本発明の熱交換器によれば、オールアルミニウム製であってもプレートフィンの材質はアルミニウムまたはアルミニウム合金とし、伝熱管は材質がアルミニウムまたはアルミニウム合金の円筒状芯材の外面に芯材より腐食電位が卑な材質のアルミニウム合金で被覆した被覆層を有するアルミニウムクラッド管を用い、アルミニウムクラッド管の前記伝熱管の内面には前記伝熱管の長手方向と角度をなす方向に延びる複数の微細な突起状のフィンを形成するので、耐食性を有する伝熱管には孔食が発生することがほとんどなく、また伝熱管の内面の長手方向と角度をなす方向に延びる複数の微細な突起状のフィンにより高い熱交換能力を得ることができる。   As described above, according to the heat exchanger of the present invention, even if it is made of all aluminum, the plate fin is made of aluminum or aluminum alloy, and the heat transfer tube is formed on the outer surface of the cylindrical core material made of aluminum or aluminum alloy. An aluminum clad tube having a coating layer coated with an aluminum alloy whose material has a lower corrosion potential than the core material is used, and the inner surface of the heat transfer tube of the aluminum clad tube extends in a direction that forms an angle with the longitudinal direction of the heat transfer tube. Since the fins are made of fine projections, pitting corrosion is hardly generated in the heat transfer tubes having corrosion resistance, and a plurality of fine projections extending in a direction that forms an angle with the longitudinal direction of the inner surface of the heat transfer tubes. High heat exchange capability can be obtained with the fins.

以下に、本発明の実施の形態について、図面を参照しながら説明する。   Embodiments of the present invention will be described below with reference to the drawings.

（実施の形態１）
図１は本発明の第１の実施の形態における熱交換器の斜視図、図２は同熱交換器に用いる伝熱管の断面図、図３は図２におけるＡ−Ａ断面図である。 (Embodiment 1)
FIG. 1 is a perspective view of a heat exchanger according to the first embodiment of the present invention, FIG. 2 is a cross-sectional view of a heat transfer tube used in the heat exchanger, and FIG. 3 is a cross-sectional view along AA in FIG.

図１において、プレートフィンアンドチューブタイプの熱交換器は、一定間隔で平行に並べられるとともに、その間を気体３が流動する複数のプレートフィン１と、プレートフィン１に所定の段ピッチおよび列ピッチで略直角に挿入され、内部を流体４が流動する略円筒状の伝熱管２から構成され、伝熱管２は、伝熱管２の拡管や、接着、ろう付けなどによりプレートフィン１に密着している。   In FIG. 1, plate fin and tube type heat exchangers are arranged in parallel at regular intervals, a plurality of plate fins 1 through which a gas 3 flows, and plate fins 1 with a predetermined step pitch and row pitch. The heat transfer tube 2 is inserted at a substantially right angle and has a substantially cylindrical heat transfer tube 2 in which the fluid 4 flows. The heat transfer tube 2 is in close contact with the plate fin 1 by expansion of the heat transfer tube 2, adhesion, brazing, or the like. .

本発明の実施の形態１における熱交換器は、プレートフィン１の材質と伝熱管２の材質および、伝熱管２の内面形状に特徴がある。すなわち、プレートフィン１の材質はアルミニウムまたはアルミニウム合金とし、伝熱管２は、図２および図３に示すように、材質がアルミニウムまたはアルミニウム合金の円筒状の芯材２１の外面に、芯材２１より腐食電位が卑な材質のアルミニウム合金で被覆した被覆層２２を有するアルミニウムクラッド管である。さらに、アルミニウムクラッド管の伝熱管２の内面には伝熱管２の長手方向と角度をなす方向に延びる複数の微細な突起状フィン２３が形成されている。   The heat exchanger according to Embodiment 1 of the present invention is characterized by the material of the plate fins 1, the material of the heat transfer tubes 2, and the inner shape of the heat transfer tubes 2. That is, the material of the plate fin 1 is aluminum or aluminum alloy, and the heat transfer tube 2 is formed on the outer surface of the cylindrical core material 21 made of aluminum or aluminum alloy, as shown in FIGS. This is an aluminum clad tube having a coating layer 22 coated with an aluminum alloy having a low corrosion potential. Furthermore, a plurality of fine projecting fins 23 extending in a direction that forms an angle with the longitudinal direction of the heat transfer tube 2 are formed on the inner surface of the heat transfer tube 2 of the aluminum clad tube.

また、アルミニウムクラッド管の伝熱管２の芯材２１はＪＩＳ Ａ ３００３など３０００系のＡｌ−Ｍｎ系合金を用い、伝熱管２の外面の被覆層２２にはＪＩＳ Ａ ７０７２など伝熱管２の芯材２１より腐食電位が卑で、伝熱管２の芯材２１の腐食に対して犠牲材となるＡｌ−Ｚｎ系合金を用いる。   The core material 21 of the heat transfer tube 2 of the aluminum clad tube is made of a 3000 series Al—Mn alloy such as JIS A 3003, and the coating layer 22 on the outer surface of the heat transfer tube 2 is the core material of the heat transfer tube 2 such as JIS A 7072. An Al—Zn alloy that has a lower corrosion potential than 21 and is a sacrificial material against the corrosion of the core material 21 of the heat transfer tube 2 is used.

また、プレートフィン１のアルミニウムまたはアルミニウム合金の材質は、伝熱管２の芯材２１の材質より腐食電位が卑であるものまたは同等であるものを用いる。例えば、プレートフィン１はＪＩＳ Ａ １０５０など１０００系の工業用純アルミニウム、または伝熱管２の芯材２１と同じ材質のアルミニウム合金を用い、すなわち、伝熱管２の芯材２１の材質がＪＩＳ Ａ ３００３であればプレートフィン１の材質としてもＪＩＳ Ａ ３００３を用いる。   In addition, the material of the plate fin 1 made of aluminum or aluminum alloy is one having a lower or lower corrosion potential than the material of the core material 21 of the heat transfer tube 2. For example, the plate fin 1 is made of 1000 series industrial pure aluminum such as JIS A 1050, or an aluminum alloy made of the same material as the core material 21 of the heat transfer tube 2, that is, the material of the core material 21 of the heat transfer tube 2 is JIS A 3003. If so, JIS A 3003 is used as the material of the plate fin 1.

伝熱管２の内部を流通させる流体４としては、ＨＦＣ冷媒またはＨＣ冷媒またはＣＯ２冷媒のいずれか、またはそれらを１つ以上含む混合冷媒を使用する。 As the fluid 4 that circulates inside the heat transfer tube 2, either an HFC refrigerant, an HC refrigerant, a CO 2 refrigerant, or a mixed refrigerant including one or more of them is used.

以上のように構成されたプレートフィンアンドチューブタイプのオールアルミニウム製の熱交換器は、プレートフィン１の材質をアルミニウムまたはアルミニウム合金とし、伝熱管２は、材質がアルミニウムまたはアルミニウム合金の円筒状芯材２１の外面に芯材２１より腐食電位が卑な材質のアルミニウム合金で被覆した被覆層２２を有するアルミニウムクラッド管とし、さらに、アルミニウムクラッド管の伝熱管２の内面には伝熱管２の長手方向と角度をなす方向に延びる複数の微細な突起状フィン２３が形成されているので、伝熱管２の内面に形成された伝熱管２の長手方向と角度をなす方向に延びる複数の微細な突起状フィン２３による内面の伝熱面積の増大効果、および内面を流動する流体４への攪拌効果、および内面を流動する流体４が二相流のとき引き起こされるらせん流による液膜の掻き揚げ効果で、高い伝熱性能を得ることができるとともに、伝熱管２に何らかの要因による腐食が始まったときも、アルミニウムクラッド管の芯材２１より腐食電位が卑な材質の被覆層２２に先に腐食が進んで、被覆層２２が消滅するまで芯材２１が腐食することはなく、伝熱管２に腐食による貫通孔が発生して、内部を流動する流体４が外部に洩れる現象を遅らせることができる。   In the plate fin and tube type all-aluminum heat exchanger configured as described above, the material of the plate fin 1 is aluminum or aluminum alloy, and the heat transfer tube 2 is a cylindrical core material made of aluminum or aluminum alloy. An aluminum clad tube having a coating layer 22 coated on the outer surface of the core 21 with an aluminum alloy whose corrosion potential is lower than that of the core material 21, and on the inner surface of the heat transfer tube 2 of the aluminum clad tube Since a plurality of fine protruding fins 23 extending in an angled direction are formed, a plurality of fine protruding fins extending in a direction that forms an angle with the longitudinal direction of the heat transfer tube 2 formed on the inner surface of the heat transfer tube 2 23 increases the heat transfer area of the inner surface, stirs the fluid 4 flowing on the inner surface, and flows on the inner surface. High heat transfer performance can be obtained by the effect of the liquid film scraping caused by the spiral flow caused when the body 4 is a two-phase flow, and when the corrosion of the heat transfer tube 2 due to some factors starts, Corrosion proceeds first to the coating layer 22 of a material having a lower corrosion potential than the core material 21, and the core material 21 does not corrode until the coating layer 22 disappears, and a through hole is generated in the heat transfer tube 2 due to corrosion. Thus, the phenomenon that the fluid 4 flowing inside leaks to the outside can be delayed.

また、アルミニウムクラッド管の伝熱管２の芯材２１はＪＩＳ Ａ ３００３など３０００系のＡｌ−Ｍｎ系合金を用い、伝熱管２の外面の被覆層２２にはＪＩＳ Ａ ７０７２などＡｌ−Ｚｎ系合金を用いるので、ＪＩＳ Ａ ３００３など３０００系のＡｌ−Ｍｎ系合金の材質の芯材２１より腐食電位が卑なＪＩＳ Ａ ７０７２などＡｌ−Ｚｎ系合金の材質の被覆層２２が芯材２１の腐食に対して犠牲材となって、被覆層２２が消滅するまで芯材２１が腐食することがなく、伝熱管２の腐食による貫通孔の発生を抑えることができる。   The core material 21 of the heat transfer tube 2 of the aluminum clad tube is made of 3000 series Al—Mn alloy such as JIS A 3003, and the coating layer 22 on the outer surface of the heat transfer pipe 2 is made of Al—Zn alloy such as JIS A 7072. Therefore, the coating layer 22 made of an Al—Zn alloy such as JIS A 7072 has a lower corrosion potential than the core 21 made of a 3000 series Al—Mn alloy such as JIS A 3003. Thus, the core material 21 does not corrode until the coating layer 22 disappears as a sacrificial material, and the generation of through holes due to the corrosion of the heat transfer tube 2 can be suppressed.

また、プレートフィン１のアルミニウムまたはアルミニウム合金の材質は、伝熱管２の芯材２１の材質より腐食電位が卑であるものまたは同等であるものを用いる。具体的には例えば、プレートフィン１はＪＩＳ Ａ １０５０など１０００系の工業用純アルミニウム、または伝熱管２の芯材２１と同じ材質のアルミニウム合金を用い、すなわち、伝熱管２の芯材２１の材質がＪＩＳ Ａ ３００３であればプレートフィン１の材質としてもＪＩＳ Ａ ３００３を用いるので、アルミニウムクラッド管の伝熱管２の被覆層２２が芯材２１の腐食に対して犠牲材となり消滅してしまってからも、プレートフィン１の腐食電位が芯材２１の腐食電位と同等であれば芯材２１がプレートフィン１より先に腐食することがなく、さらにプレートフィン１の腐食電位が伝熱管２の芯材２１の腐食電位より卑であれば、プレートフィン１が伝熱管２の芯材２１の腐食に対し、伝熱管２の被覆層２２に替わって継続して犠牲材となって、芯材２１に腐食貫通孔が発生するのを遅らせることができる。   In addition, the material of the plate fin 1 made of aluminum or aluminum alloy is one having a lower or lower corrosion potential than the material of the core material 21 of the heat transfer tube 2. Specifically, for example, the plate fin 1 is made of 1000 series industrial pure aluminum such as JIS A 1050 or an aluminum alloy of the same material as the core material 21 of the heat transfer tube 2, that is, the material of the core material 21 of the heat transfer tube 2. If JIS A 3003 is used, JIS A 3003 is used as the material of the plate fin 1, so that the coating layer 22 of the heat transfer tube 2 of the aluminum clad tube becomes a sacrificial material against the corrosion of the core material 21 and disappears. However, if the corrosion potential of the plate fin 1 is equal to the corrosion potential of the core material 21, the core material 21 will not corrode prior to the plate fin 1, and the corrosion potential of the plate fin 1 will be the core material of the heat transfer tube 2. If the corrosion potential of the heat transfer tube 2 is lower than the corrosion potential of the heat transfer tube 2, the plate fin 1 continues to be sacrificed instead of the coating layer 22 of the heat transfer tube 2. Becomes, corrosion through hole in the core material 21 can be delayed to occur.

また、本発明の実施の形態１における熱交換器の伝熱管２の内部を流通させる流体４としては、ＨＦＣ冷媒またはＨＣ冷媒またはＣＯ２冷媒のいずれか、またはそれらを１つ以上含む混合冷媒を使用するので、地球環境に配慮した商品とすることができる。 As the fluid 4 to flow inside the heat transfer tubes 2 of the heat exchanger in the first embodiment of the present invention, either HFC refrigerant or HC refrigerant or CO 2 refrigerant, or the refrigerant mixture containing them one or more Since it is used, it can be made into a product in consideration of the global environment.

なお、アルミニウムクラッド管の伝熱管２の内面に伝熱管２の長手方向と角度をなす方向に延びる複数の微細な突起状フィン２３を形成する製造法としては、内面が平滑なアルミニウムクラッド管を押出し加工で作成してから転造加工で内面に複数のらせん状の微細な突起状フィン２３を設ける方法や、後で内側の芯材２１となる板と、後で外側の被覆層２２となる板を貼り合わせたものの後で内表面となる芯材２１の表面に、伝熱管２の長手方向と角度をなす方向に延びる複数の微細な突起状フィン２３を機械加工してから、合せ
目を電縫溶接する方法が考えられる。 As a manufacturing method for forming a plurality of fine protruding fins 23 extending in a direction that forms an angle with the longitudinal direction of the heat transfer tube 2 on the inner surface of the heat transfer tube 2 of the aluminum clad tube, an aluminum clad tube having a smooth inner surface is extruded. A method of providing a plurality of fine spiral-shaped fins 23 on the inner surface by rolling after forming, or a plate that later becomes the inner core member 21 and a plate that later becomes the outer coating layer 22 After machining a plurality of fine projecting fins 23 extending in a direction that makes an angle with the longitudinal direction of the heat transfer tube 2 on the surface of the core material 21 that becomes the inner surface after bonding, the seam is electrically connected. A method of sewing welding is conceivable.

本発明にかかるオールアルミニウム製のプレートフィンアンドチューブタイプの熱交換器は、プレートフィンの材質はアルミニウムまたはアルミニウム合金とし、伝熱管は、材質がアルミニウムまたはアルミニウム合金の円筒状芯材の外面に、芯材より腐食電位が卑な材質のアルミニウム合金で被覆した被覆層を有するアルミニウムクラッド管を用い、アルミニウムクラッド管の伝熱管の内面には伝熱管の長手方向と角度をなす方向に延びる複数の微細な突起状フィンを形成するもので、この構成によって、オールアルミニウム製の熱交換器は、耐食性を有する伝熱管に孔食が発生することがほとんどなく、また伝熱管の内面の長手方向と角度をなす方向に延びる複数の微細な突起状のフィンにより高い熱交換能力を得ることができるので、ルームエアコン、パッケージエアコン、カーエアコン、ヒートポンプ式給湯機、冷蔵庫、冷凍庫などの熱交換器として有用である。   In the all-aluminum plate fin and tube type heat exchanger according to the present invention, the plate fin is made of aluminum or aluminum alloy, and the heat transfer tube is formed on the outer surface of a cylindrical core made of aluminum or aluminum alloy. Using an aluminum clad tube having a coating layer coated with an aluminum alloy whose corrosion potential is lower than that of the material, the inner surface of the heat transfer tube of the aluminum clad tube has a plurality of fine lines extending in a direction that forms an angle with the longitudinal direction of the heat transfer tube. With this configuration, the all-aluminum heat exchanger has almost no pitting corrosion in the corrosion-resistant heat transfer tube and forms an angle with the longitudinal direction of the inner surface of the heat transfer tube. Since a high heat exchange capability can be obtained by a plurality of fine protruding fins extending in the direction, Mueakon, packaged air conditioners, car air, heat pump water heater, is useful refrigerator, as a heat exchanger such as a freezer.

本発明の実施の形態１における熱交換器の斜視図The perspective view of the heat exchanger in Embodiment 1 of this invention 本発明の実施の形態１における熱交換器に用いる伝熱管の断面図Sectional drawing of the heat exchanger tube used for the heat exchanger in Embodiment 1 of this invention 図２のＡ−Ａ断面図AA sectional view of FIG. 従来のオールアルミニウム製熱交換器に用いられている伝熱管の断面図Sectional view of a heat transfer tube used in a conventional all-aluminum heat exchanger 従来の内面が平滑なアルミニウムクラッド管の断面図Sectional view of a conventional aluminum clad tube with a smooth inner surface

符号の説明Explanation of symbols

１ プレートフィン
２ 伝熱管
３ 気体
４ 流体
２１ 芯材
２２ 被覆層
２３ 突起状フィン 1 Plate Fin 2 Heat Transfer Tube 3 Gas 4 Fluid 21 Core Material 22 Covering Layer 23 Projection Fin

Claims (5)

一定間隔で平行に並べられるとともに、その間を気体が流動するプレートフィン群と、前記プレートフィン群に所定の段ピッチ・列ピッチで略直角に挿入され、内部を流体が流動する略円筒状の伝熱管群から構成され、前記伝熱管を拡管することなどにより前記プレートフィンに密着させるプレートフィンアンドチューブタイプの熱交換器において、前記プレートフィンの材質はアルミニウムまたはアルミニウム合金とし、前記伝熱管は、材質がアルミニウムまたはアルミニウム合金の円筒状芯材の外面に芯材より腐食電位が卑な材質のアルミニウム合金で被覆した被覆層を有するアルミニウムクラッド管を用い、アルミニウムクラッド管の前記伝熱管の内面には前記伝熱管の長手方向と角度をなす方向に延びる複数の微細な突起状のフィンが形成されていることを特徴とする熱交換器。 Plate fin groups arranged in parallel at regular intervals and gas flowing between them, and inserted into the plate fin groups at a substantially right angle with a predetermined step pitch and row pitch, and a substantially cylindrical transmission through which fluid flows. In a plate fin and tube type heat exchanger composed of a heat tube group and closely contacting the plate fin by expanding the heat transfer tube, the plate fin is made of aluminum or an aluminum alloy, and the heat transfer tube is made of a material Uses an aluminum clad tube having a coating layer coated with an aluminum alloy of a material whose corrosion potential is lower than that of the core material on the outer surface of the cylindrical core material of aluminum or aluminum alloy, and the inner surface of the heat transfer tube of the aluminum clad tube A plurality of fine protrusion-like fins extending in a direction that forms an angle with the longitudinal direction of the heat transfer tube Heat exchanger, characterized in that it is formed. 前記伝熱管の芯材はＪＩＳ Ａ ３００３など３０００系のＡｌ−Ｍｎ系合金を用い、前記伝熱管の外面の被覆層はＪＩＳ Ａ ７０７２など前記伝熱管の芯材より腐食電位が卑で、前記伝熱管の芯材の腐食に対して犠牲材となるＡｌ−Ｚｎ系合金を用いたことを特徴とする請求項１に記載の熱交換器。 The core material of the heat transfer tube is made of a 3000 series Al-Mn alloy such as JIS A 3003, and the coating layer on the outer surface of the heat transfer tube has a lower corrosion potential than the core material of the heat transfer tube such as JIS A 7072. The heat exchanger according to claim 1, wherein an Al-Zn alloy that is a sacrificial material against corrosion of the core material of the heat pipe is used. 前記プレートフィンのアルミニウムまたはアルミニウム合金の材質は、前記伝熱管の芯材の材質より腐食電位が同等以下であることを特徴とする請求項１または２に記載の熱交換器。 3. The heat exchanger according to claim 1, wherein the plate fin is made of aluminum or an aluminum alloy having a corrosion potential equal to or less than that of a core material of the heat transfer tube. 前記プレートフィンはＪＩＳ Ａ １０５０など１０００系の工業用純アルミニウム、または前記伝熱管の芯材と同じ材質のアルミニウム合金を用いたことを特徴とする請求項２〜３のいずれか１項に記載の熱交換器。 The said plate fin used 1000 series industrial pure aluminums, such as JIS A1050, or the aluminum alloy of the same material as the core material of the said heat exchanger tube, The any one of Claims 2-3 characterized by the above-mentioned. Heat exchanger. 前記伝熱管の内部を流通させる流体として、ＨＦＣ冷媒またはＨＣ冷媒またはＣＯ２冷媒のいずれかまたはそれらを１つ以上含む混合冷媒を使用することを特徴とする請求項１〜４のいずれか１項に記載の熱交換器。 5. The HFC refrigerant, the HC refrigerant, the CO 2 refrigerant, or a mixed refrigerant containing one or more of them is used as the fluid that circulates inside the heat transfer tube. The heat exchanger as described in.
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