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JP7652205B2 - Refrigeration Cycle Equipment - Google Patents
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JP7652205B2 - Refrigeration Cycle Equipment - Google Patents

Refrigeration Cycle Equipment Download PDF

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JP7652205B2
JP7652205B2 JP2023046636A JP2023046636A JP7652205B2 JP 7652205 B2 JP7652205 B2 JP 7652205B2 JP 2023046636 A JP2023046636 A JP 2023046636A JP 2023046636 A JP2023046636 A JP 2023046636A JP 7652205 B2 JP7652205 B2 JP 7652205B2
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copper
aluminum
joint
tube
heat exchanger
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JP2024135774A (en
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宏明 ▲高▼橋
俊裕 ▲高▼橋
尚希 緒方
凌 柴田
純平 桶田
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Fujitsu General Ltd
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Fujitsu General Ltd
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Priority to JP2023046636A priority Critical patent/JP7652205B2/en
Priority to AU2024237893A priority patent/AU2024237893A1/en
Priority to CN202480017727.2A priority patent/CN120883014A/en
Priority to PCT/JP2024/011097 priority patent/WO2024195833A1/en
Priority to EP24774967.4A priority patent/EP4685419A1/en
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    • 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
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/003—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass for preventing corrosion
    • 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
    • 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
    • F24F1/30—Refrigerant piping for use inside the separate outdoor units
    • 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

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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)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Other Air-Conditioning Systems (AREA)

Description

本発明は、冷凍サイクル装置に関する。 The present invention relates to a refrigeration cycle device.

冷凍サイクル装置としての空気調和機は、室内熱交換器、室外熱交換器、圧縮機及び制御部品（四方弁・膨張弁など）が冷媒配管で接続されており、冷媒管としては銅製又は銅合金製の冷媒管（以下、銅冷媒管と称する）が使用されている。近年、低コスト化や軽量化の要望から、室内熱交換器や室外熱交換器内に設けたチューブ及び室内熱交換器や室外熱交換器の外部に突出した冷媒配管を、アルミニウム製又はアルミニウム合金製の冷媒管（以下、アルミニウム冷媒管と称する）とすることが提案されている。 In an air conditioner as a refrigeration cycle device, the indoor heat exchanger, outdoor heat exchanger, compressor, and control parts (four-way valve, expansion valve, etc.) are connected by refrigerant piping, and the refrigerant piping used is made of copper or copper alloy (hereinafter referred to as copper refrigerant piping). In recent years, due to the demand for lower costs and weight, it has been proposed to use aluminum or aluminum alloy refrigerant piping (hereinafter referred to as aluminum refrigerant piping) for the tubes installed in the indoor heat exchanger and outdoor heat exchanger and the refrigerant piping protruding outside the indoor heat exchanger and outdoor heat exchanger.

一方、信頼性や製造上の課題から制御部品に接続する冷媒配管は、アルミニウムよりも展性の高い銅冷媒管を使用することが一般的である。そのため、室内熱交換器や室外熱交換器の外部に突出したアルミニウム冷媒管と、制御部品に接続する銅冷媒管とを接合する接合部が形成されている。 On the other hand, due to reliability and manufacturing issues, copper refrigerant pipes, which are more malleable than aluminum, are generally used for the refrigerant piping connected to the control components. For this reason, joints are formed to join the aluminum refrigerant pipes protruding from the indoor and outdoor heat exchangers to the copper refrigerant pipes connected to the control components.

空気調和機の暖房運転時には、蒸発器として使用される室外熱交換器の冷媒配管に低温の冷媒が流れるので、外気に含まれる水蒸気が結露して銅冷媒管に露が付着する。銅冷媒管に露が付着すると銅イオンを含む水が発生し、この銅イオンを含む水がアルミニウム冷媒管と銅冷媒管との接合部に流れることで、接合部のアルミニウム冷媒管に電蝕が発生するおそれがある。また、低外気温下で暖房運転を行う場合には、銅冷媒管に発生した水が凍結し、銅冷媒管に霜や氷が付着することがある。銅冷媒管に付着した霜や氷が除霜運転により融かされると銅イオンを含む水が発生するため、この水がアルミニウム冷媒管と銅冷媒管との接合部に流れることで、アルミニウム冷媒管に電蝕が発生するおそれがある。 During heating operation of the air conditioner, low-temperature refrigerant flows through the refrigerant piping of the outdoor heat exchanger used as an evaporator, and water vapor contained in the outside air condenses, causing dew to form on the copper refrigerant tube. When dew forms on the copper refrigerant tube, water containing copper ions is generated, and if this water containing copper ions flows into the joint between the aluminum refrigerant tube and the copper refrigerant tube, there is a risk of electrical corrosion occurring in the aluminum refrigerant tube at the joint. Furthermore, when heating operation is performed at low outside temperatures, the water that forms in the copper refrigerant tube freezes, and frost or ice may form on the copper refrigerant tube. When the frost or ice that has formed on the copper refrigerant tube is melted by defrosting operation, water containing copper ions is generated, and if this water flows into the joint between the aluminum refrigerant tube and the copper refrigerant tube, there is a risk of electrical corrosion occurring in the aluminum refrigerant tube.

銅イオンを含む水がアルミニウム冷媒管及び銅冷媒管の接合部に流れるのを阻止する技術として、接合部の近くに、アルミニウム冷媒管を上側に凸形状とした逆Ｕ字部、及び、銅冷媒管を下側に凸形状としたＵ字部の少なくとも一方が設けられている技術が知られている（例えば、特許文献１）。 As a technology for preventing water containing copper ions from flowing into the joint between an aluminum refrigerant tube and a copper refrigerant tube, a technology is known in which at least one of an inverted U-shaped portion with an upper convex shape of the aluminum refrigerant tube and a U-shaped portion with a lower convex shape of the copper refrigerant tube is provided near the joint (for example, Patent Document 1).

特開２０１４－１５９９５２号公報JP 2014-159952 A

ところで、特許文献１の技術は、室外熱交換器の外部に突出したアルミニウム冷媒管及び銅冷媒管との接合部が水平に配置されている場合には、銅イオンを含む水が接合部に流れるのが阻止される。しかし、接合部が水平方向に対して傾斜して配置され、例えば銅冷媒管からなるＵ字部に対して接合部が下側に位置する場合には、Ｕ字部で発生した銅イオンを含む水が接合部側に流れていき、接合部のアルミニウム冷媒管に電蝕が発生するおそれがある。
そこで、本発明は、このような課題を解決するためになされたものであり、アルミニウム冷媒管及び銅冷媒管との接合部が水平方向に対して傾斜して配置されていても銅イオンを含む水の介在による電蝕を防止することができる冷凍サイクル装置を提供することを目的としている。 Incidentally, in the technology of Patent Document 1, when the joint between the aluminum refrigerant tube and the copper refrigerant tube protruding outside the outdoor heat exchanger is arranged horizontally, water containing copper ions is prevented from flowing into the joint. However, when the joint is arranged at an angle to the horizontal direction, for example, when the joint is located below the U-shaped portion made of the copper refrigerant tube, water containing copper ions generated in the U-shaped portion flows toward the joint, and there is a risk of electrolytic corrosion occurring in the aluminum refrigerant tube at the joint.
Therefore, the present invention has been made to solve such problems, and has an object to provide a refrigeration cycle device that can prevent electrolytic corrosion caused by the presence of water containing copper ions, even if the joint between the aluminum refrigerant tube and the copper refrigerant tube is arranged at an angle to the horizontal direction.

発明の一態様は、熱交換器の内部に設けたチューブの端部と接続して熱交換器の外部に突出しているアルミニウム製又はアルミニウム合金製のアルミニウム冷媒管と、四方弁や膨張弁などの制御部品に接続されている銅製又は銅合金製の銅冷媒管と、アルミニウム冷媒管及び銅冷媒管を接合する接合部と、を有する冷凍サイクル装置において、接合部は、熱交換器の底面に対して垂直な上下方向に沿って配置されており、接合部より上側にアルミニウム冷媒管が配置されているとともに、接合部より下側に配置した銅冷媒管に、この銅冷媒管の外径以上の長さで接合部から下方に直線状に延在する銅直線部が設けられていることを特徴とする冷凍サイクル装置である。 One aspect of the invention is a refrigeration cycle device having an aluminum refrigerant tube made of aluminum or an aluminum alloy that is connected to the end of a tube provided inside the heat exchanger and protrudes outside the heat exchanger, a copper refrigerant tube made of copper or a copper alloy that is connected to control components such as a four-way valve and an expansion valve, and a joint that joins the aluminum refrigerant tube and the copper refrigerant tube, the joint being arranged in a vertical direction perpendicular to the bottom surface of the heat exchanger, the aluminum refrigerant tube being arranged above the joint, and the copper refrigerant tube arranged below the joint being provided with a copper straight section that extends downward from the joint in a straight line with a length equal to or greater than the outer diameter of the copper refrigerant tube.

本発明の冷凍サイクル装置によれば、アルミニウム冷媒管及び銅冷媒管との接合部が水平方向に対して傾斜して配置されていても接合部における銅イオンを含む水の介在による電蝕を防止することができる。 The refrigeration cycle device of the present invention can prevent electrolytic corrosion caused by the presence of water containing copper ions at the joint between the aluminum refrigerant tube and the copper refrigerant tube, even if the joint is arranged at an angle to the horizontal direction.

本発明に係る冷凍サイクル装置を構成する室外機の外観を示す図である。1 is a diagram showing the appearance of an outdoor unit constituting a refrigeration cycle apparatus according to the present invention; 室外機の内部構造を示す図である。FIG. 2 is a diagram showing the internal structure of the outdoor unit. 室外機の内部に配置されている熱交換器を示す図である。FIG. 2 is a diagram showing a heat exchanger disposed inside the outdoor unit. 熱交換器のチューブに接続しているアルミニウム冷媒管及び銅冷媒管からなる第１冷媒管の具体的な配置を示す図である。FIG. 2 is a diagram showing a specific arrangement of a first refrigerant tube consisting of an aluminum refrigerant tube and a copper refrigerant tube connected to a tube of a heat exchanger. 熱交換器を傾斜配置したときの第１冷媒管の配置を示す図である。FIG. 11 is a diagram showing the arrangement of first refrigerant pipes when the heat exchanger is arranged at an angle. アルミニウム冷媒管及び銅冷媒管の第２実施形態の接合部を示す図である。FIG. 11 is a view showing a joint of an aluminum refrigerant tube and a copper refrigerant tube in a second embodiment. アルミニウム冷媒管及び銅冷媒管の第３実施形態の接合部を示す図である。FIG. 13 is a diagram showing a joint of an aluminum refrigerant tube and a copper refrigerant tube in a third embodiment.

次に、図面を参照して、本発明に係る実施形態を説明する。以下に示す実施形態は、本発明の技術的思想を具体化するための装置や方法を例示するものであって、本発明の技術的思想は、構成部品の材質、形状、構造、配置等を下記のものに特定するものでない。本発明の技術的思想は、特許請求の範囲に記載された請求項が規定する技術的範囲内において、種々の変更を加えることができる。 Next, an embodiment of the present invention will be described with reference to the drawings. The embodiments shown below are examples of devices and methods for embodying the technical idea of the present invention, and the technical idea of the present invention does not specify the materials, shapes, structures, arrangements, etc. of the components as described below. The technical idea of the present invention can be modified in various ways within the technical scope defined by the claims.

［第１実施形態の室外機］
図１は、冷凍サイクル装置の一種である空気調和機の室外機１の外観を示す図であり、図２は、室外機１の内部構造を示す図である。
図１に示すように、室外機１は箱状の筐体２を有する。筐体２は、筐体２の底面を形成するベース３（図２参照）と、筐体２の前面を形成する前面パネル４と、筐体２の側面を形成する右側パネル５及び左側パネル６と、筐体２の上面を形成する天板７と、を有する。前面パネル４には吹出し口が設けられており、吹出し口にファンガード８が取り付けられている。なお、ベース３が、本発明の底面に対応している。 [Outdoor unit of the first embodiment]
FIG. 1 is a diagram showing the external appearance of an outdoor unit 1 of an air conditioner, which is a type of refrigeration cycle device, and FIG. 2 is a diagram showing the internal structure of the outdoor unit 1. As shown in FIG.
As shown in Fig. 1, the outdoor unit 1 has a box-shaped housing 2. The housing 2 has a base 3 (see Fig. 2) that forms the bottom surface of the housing 2, a front panel 4 that forms the front surface of the housing 2, a right panel 5 and a left panel 6 that form the sides of the housing 2, and a top plate 7 that forms the top surface of the housing 2. An air outlet is provided in the front panel 4, and a fan guard 8 is attached to the air outlet. The base 3 corresponds to the bottom surface of the present invention.

図２に示すように、筐体２の内部には、圧縮機１０、熱交換器（室外熱交換器）１１、膨張弁１２、送風ファン１３、電装ユニット１４などが収納されている。
筐体２の内部空間には、仕切り板１５によって圧縮機１０、膨張弁１２、電装ユニット１４などが配置された機械室１６と、送風ファン１３、熱交換器１１が配置された熱交換室１７とに仕切られている。 As shown in FIG. 2, the housing 2 accommodates a compressor 10, a heat exchanger (outdoor heat exchanger) 11, an expansion valve 12, a blower fan 13, an electrical unit 14, and the like.
The internal space of the housing 2 is divided by a partition plate 15 into a machine chamber 16 in which the compressor 10, expansion valve 12, electrical unit 14, etc. are arranged, and a heat exchange chamber 17 in which the blower fan 13 and heat exchanger 11 are arranged.

熱交換器１１は、図２に示すように、筐体２の背面から左側の側面に沿ってＬ字型に設けられており、蛇行する形状に形成されたチューブ１８と、薄い金属板で形成した複数のフィン１９を有している。複数のフィン１９は、上下方向に延在して互いに水平方向に等間隔に配置されＬ字型に設けられている。チューブ１８は、アルミニウム製又はアルミニウム合金製の冷媒管であり、Ｌ字型に配置した複数のフィン１９に直交する方向に挿通され、上下方向に平行に並ぶように折り返して配置されている。 As shown in FIG. 2, the heat exchanger 11 is arranged in an L-shape from the rear to the left side of the housing 2, and has a tube 18 formed in a serpentine shape and multiple fins 19 formed from thin metal plates. The multiple fins 19 extend vertically and are arranged in an L-shape at equal intervals in the horizontal direction. The tube 18 is a refrigerant tube made of aluminum or an aluminum alloy, and is inserted in a direction perpendicular to the multiple fins 19 arranged in the L-shape, and is folded back so that they are aligned parallel to the vertical direction.

図３に示すように、チューブ１８の一端は熱交換器１１の右側部の下側から外部に突出しており、チューブ１８の一端１８ａ（図４参照）に第１冷媒管２０の一端が接合されている。第１冷媒管２０の他端には膨張弁１２が接続されている。また、チューブ１８の他端１８ｂは熱交換器１１の右側部の上側から外部に突出しており、チューブ１８の他端１８ｂに第２冷媒管２１の一端が接合されている。第２冷媒管２１の他端には圧縮機１０が接続されている。 As shown in FIG. 3, one end of the tube 18 protrudes from the lower side of the right side of the heat exchanger 11 to the outside, and one end of a first refrigerant pipe 20 is joined to one end 18a of the tube 18 (see FIG. 4). The expansion valve 12 is connected to the other end of the first refrigerant pipe 20. The other end 18b of the tube 18 protrudes from the upper side of the right side of the heat exchanger 11 to the outside, and one end of a second refrigerant pipe 21 is joined to the other end 18b of the tube 18. The compressor 10 is connected to the other end of the second refrigerant pipe 21.

空気調和機の暖房運転時には、熱交換器１１が蒸発器として使用され、膨張弁１２で減圧された低温の冷媒が、第１冷媒管２０、熱交換器１１のチューブ１８、第２冷媒管２１及び圧縮機１０の順で流れるようになっている。
第１冷媒管２０は、チューブ１８の一端１８ａに接合されるアルミニウム製又はアルミニウム合金製のアルミニウム冷媒管２２と、膨張弁１２に接合される銅製又は銅合金製の銅冷媒管２３と、を有している。 During heating operation of the air conditioner, the heat exchanger 11 is used as an evaporator, and low-temperature refrigerant reduced in pressure by the expansion valve 12 flows in the following order: the first refrigerant pipe 20, the tube 18 of the heat exchanger 11, the second refrigerant pipe 21, and the compressor 10.
The first refrigerant pipe 20 has an aluminum refrigerant pipe 22 made of aluminum or an aluminum alloy that is joined to one end 18a of the tube 18, and a copper refrigerant pipe 23 made of copper or a copper alloy that is joined to the expansion valve 12.

アルミニウム冷媒管２２及び銅冷媒管２３は、同一の外径寸法を有する直管部材であり、互いの端部同士を接合して接合部２４が形成されている。
接合部２４、アルミニウム冷媒管２２の端部外周及び銅冷媒管２４の端部外周には、絶縁材料で形成した筒状の防水被覆材３１が装着されている。この防水被覆材３１は、接合部２４、第２直線部２６ｂ及び銅直線部２７の端部外周に密着する熱収縮チューブである。 The aluminum refrigerant pipe 22 and the copper refrigerant pipe 23 are straight pipe members having the same outer diameter, and a joint 24 is formed by joining the ends of the pipes.
A cylindrical waterproof covering material 31 made of an insulating material is attached to the joint 24, the outer periphery of the end of the aluminum refrigerant pipe 22, and the outer periphery of the end of the copper refrigerant pipe 24. This waterproof covering material 31 is a heat shrink tube that fits closely to the outer periphery of the end of the joint 24, the second straight portion 26b, and the copper straight portion 27.

直管形状のアルミニウム冷媒管２２は、アルミニウム直線部２５と、アルミニウム直線部２５の端部から連続して形成されたＵ字形状のアルミニウムＵ字部２６と、を有するように曲げられる。アルミニウムＵ字部２６は、アルミニウム直線部２５に対して直交する方向に曲げられた第１直線部２６ａと、第１直線部２６ａに平行に延在して第１直線部２６ａより長尺であり、端部側に接合部２４が形成されている第２直線部２６ｂと、第１直線部２６ａ及び第２直線部２６ｂの一端同士を連結している半円弧部２６ｃと、を有する。
直管形状の銅冷媒管２３は、端部側に接合部２４が形成されている銅直線部２７と、銅直線部２７の端部から連続して形成されたＵ字形状の銅Ｕ字部２８と、を有するように曲げられる。銅直線部２７の長さＬは、銅冷媒管２３の外径φ以上の寸法に設定されている。 The straight aluminum refrigerant pipe 22 is bent to have an aluminum straight portion 25 and an aluminum U-shaped portion 26 formed continuously from an end of the aluminum straight portion 25. The aluminum U-shaped portion 26 has a first straight portion 26a bent in a direction perpendicular to the aluminum straight portion 25, a second straight portion 26b extending parallel to the first straight portion 26a and being longer than the first straight portion 26a, with a joint portion 24 formed on the end side, and a semicircular arc portion 26c connecting one ends of the first straight portion 26a and the second straight portion 26b.
The straight copper refrigerant pipe 23 is bent to have a copper straight portion 27 having a joint portion 24 formed on the end side thereof, and a U-shaped copper U-shaped portion 28 formed continuously from the end of the copper straight portion 27. The length L of the copper straight portion 27 is set to a dimension equal to or greater than the outer diameter φ of the copper refrigerant pipe 23.

アルミニウム冷媒管２２は、アルミニウムＵ字部２６が上側に凸形状となるように配置され、アルミニウム直線部２５がベース３に対して平行に延在するように、アルミニウム直線部２５の端部がチューブ１８の一端１８ａに接合されている。これにより、アルミニウムＵ字部２６の第２直線部２６ｂが、ベースに対して垂直な上下方向に沿って配置される。このアルミニウム直線部２５とチューブ１８の一端１８ａと接合位置を、熱交換器側接合部２９と称する。なお、上側に凸形状に配置されたアルミニウムＵ字部２６が、本発明においてアルミニウム冷媒管の逆Ｕ字部に対応している。また、銅直線部２７の長さＬが、本発明における銅直線部の接合部から下方に直線状に延在する銅冷媒管の外径以上の長さに対応している。 The aluminum refrigerant tube 22 is arranged so that the aluminum U-shaped portion 26 is convex upward, and the end of the aluminum straight portion 25 is joined to one end 18a of the tube 18 so that the aluminum straight portion 25 extends parallel to the base 3. As a result, the second straight portion 26b of the aluminum U-shaped portion 26 is arranged along the vertical direction perpendicular to the base. The joining position between this aluminum straight portion 25 and one end 18a of the tube 18 is called the heat exchanger side joining portion 29. The aluminum U-shaped portion 26 arranged in a convex upward shape corresponds to the inverted U-shaped portion of the aluminum refrigerant tube in this invention. In addition, the length L of the copper straight portion 27 corresponds to a length equal to or greater than the outer diameter of the copper refrigerant tube extending linearly downward from the joining portion of the copper straight portion in this invention.

アルミニウム冷媒管２２と銅冷媒管２３の接合部２４は、銅冷媒管２３の銅直線部２７の上端部と、アルミニウム冷媒管２２の第２直線部２６ｂの下端部とを突き合わせて溶接で接合されることで形成され、この接合部２４は、ベース３に対して垂直な上下方向に沿って配置される。 The joint 24 between the aluminum refrigerant pipe 22 and the copper refrigerant pipe 23 is formed by butting together the upper end of the copper straight section 27 of the copper refrigerant pipe 23 and the lower end of the second straight section 26b of the aluminum refrigerant pipe 22 and welding them together, and this joint 24 is positioned vertically relative to the base 3.

銅冷媒管２３の銅Ｕ字部２８は、下側に凸形状となるように配置され、アルミニウム直線部２５とチューブ１８の一端１８ａとの熱交換器側接合部２９は、接合部２４及び銅冷媒管２３の銅Ｕ字部２８に対して上方の位置に配置される。なお、下側に凸形状になるように配置された銅Ｕ字部２８が本発明において銅冷媒配管のＵ字部に対応している。ここで、銅Ｕ字部２８の他端には他の銅冷媒管３０が溶接により接合されており、この銅冷媒管３０が本発明において第２の銅冷媒管に対応し、膨張弁１２に接続されるようになっている。 The copper U-shaped portion 28 of the copper refrigerant tube 23 is arranged so as to form a downward convex shape, and the heat exchanger side joint 29 between the aluminum straight portion 25 and one end 18a of the tube 18 is arranged in a position above the joint 24 and the copper U-shaped portion 28 of the copper refrigerant tube 23. The copper U-shaped portion 28 arranged so as to form a downward convex shape corresponds to the U-shaped portion of the copper refrigerant piping in this invention. Here, another copper refrigerant tube 30 is joined by welding to the other end of the copper U-shaped portion 28, and this copper refrigerant tube 30 corresponds to the second copper refrigerant tube in this invention and is connected to the expansion valve 12.

そして、防水被覆材３１は、接合部２４、第２直線部２６ｂの下端部及び銅直線部２７の上端部の外周に密着することで、接合部２４及び銅直線部２７に対して水密性を確保し、アルミニウム冷媒管２２に近い接合部２４や銅直線部２７で銅イオンを含む水が発生することを防いでいる。そのため、防水被覆材３１により、アルミニウム冷媒管２２に銅冷媒管２３で発生した銅イオンを含む水が流れることを防止できる。すなわち、防水被覆材３１は、少なくとも接合部２４及び銅直線部２７に装着される必要がある。防水被覆材３１は、熱収縮チューブに限らず、撥水コーティングやブチルゴムなどを用いることでも水密性が確保される。 The waterproof covering material 31 adheres closely to the outer periphery of the joint 24, the lower end of the second straight portion 26b, and the upper end of the copper straight portion 27, thereby ensuring watertightness of the joint 24 and the copper straight portion 27 and preventing water containing copper ions from being generated at the joint 24 and the copper straight portion 27 close to the aluminum refrigerant tube 22. Therefore, the waterproof covering material 31 can prevent water containing copper ions generated in the copper refrigerant tube 23 from flowing into the aluminum refrigerant tube 22. In other words, the waterproof covering material 31 needs to be attached to at least the joint 24 and the copper straight portion 27. The waterproof covering material 31 is not limited to a heat shrink tube, and watertightness can also be ensured by using a water-repellent coating, butyl rubber, or the like.

ここで、前述した銅Ｕ字部２８と銅冷媒管３０との接合部は溶接で接合する際に、溶接バーナの火が防水被覆材３１及びアルミニウム冷媒管２２に直接当たらず、溶接バーナの熱により防水被覆材３１の形状が変形し被覆効果を損ねないような距離に配置されていればよい。すなわち、この距離が、発明において防水被覆材及び接合部に溶接による熱的影響を与えない距離に対応している。 The joint between the copper U-shaped portion 28 and the copper refrigerant pipe 30 described above should be located at a distance such that the flame from the welding burner does not directly strike the waterproof coating material 31 and the aluminum refrigerant pipe 22 when they are welded together, and such that the heat from the welding burner does not cause the shape of the waterproof coating material 31 to deform, impairing the coating effect. In other words, this distance corresponds to the distance in the present invention where the thermal effects of welding are not felt by the waterproof coating material and the joint.

次に、第１冷媒管２０を有する熱交換器１１の作用について、図４及び図５を参照して説明する。図４は、水平な設置面に筐体２のベース３が設置されている状態を示し、図５は、熱交換器１１の設置可能な最大傾斜角度であるΘ＝５°で傾斜した設置面に筐体２のベース３が設置されている状態を示している。以下、図４を水平設置状態、図５を傾斜設置状態と称する。 Next, the operation of the heat exchanger 11 having the first refrigerant pipe 20 will be described with reference to Figures 4 and 5. Figure 4 shows the state in which the base 3 of the housing 2 is installed on a horizontal installation surface, and Figure 5 shows the state in which the base 3 of the housing 2 is installed on an installation surface inclined at Θ = 5°, which is the maximum inclination angle at which the heat exchanger 11 can be installed. Hereinafter, Figure 4 will be referred to as the horizontal installation state, and Figure 5 will be referred to as the inclined installation state.

低外気温下で空気調和機の暖房運転を行うと、蒸発器として使用される熱交換器１１の第１冷媒管２０に低温の冷媒が流れるので、外気に含まれる水蒸気が結露して銅冷媒管２３に霜や氷が付着する。銅冷媒管２３に付着した霜や氷が除霜運転により融かされると銅イオンを含む水が発生し、銅Ｕ字部２８に溜まることがある。 When the air conditioner is operated in heating mode at low outdoor temperatures, a low-temperature refrigerant flows through the first refrigerant tube 20 of the heat exchanger 11, which is used as an evaporator, and the water vapor contained in the outdoor air condenses, causing frost and ice to form on the copper refrigerant tube 23. When the frost and ice on the copper refrigerant tube 23 melts during defrosting operation, water containing copper ions is generated and may accumulate in the copper U-shaped section 28.

第１冷媒管２０の接合部２４は、図４の水平設置状態でも、図５の傾斜設置状態であっても上下方向に沿って配置されており、接合部２４の上側にアルミニウム冷媒管２２の第２直線部２６ｂが配置され、接合部２４の下側に銅冷媒管２３の銅直線部２７が配置されているので、銅Ｕ字部２８に溜まった銅イオンを含む水は接合部２４に流れない。 The joint 24 of the first refrigerant pipe 20 is arranged along the vertical direction whether it is installed horizontally as shown in FIG. 4 or in the inclined installation state as shown in FIG. 5. The second straight portion 26b of the aluminum refrigerant pipe 22 is arranged above the joint 24, and the copper straight portion 27 of the copper refrigerant pipe 23 is arranged below the joint 24. Therefore, the water containing copper ions that has accumulated in the copper U-shaped portion 28 does not flow to the joint 24.

また、銅直線部２７の長さＬが銅直線部２７の外径以上の寸法に設定されており、銅Ｕ字部２８と接合部２４の距離が結露により発生する水滴の大きさよりも大きく距離を確保できるので、銅Ｕ字部２８で発生した霜や氷が成長しても接合部２４に到達しにくくなる。そのため、除霜運転により銅Ｕ字部２８で発生した霜や氷が融されても銅イオンを含む水が接合部２４で発生し、アルミニウム冷媒管２２にまで到達するのを防止することができる。 In addition, the length L of the copper straight section 27 is set to a dimension equal to or greater than the outer diameter of the copper straight section 27, and the distance between the copper U-shaped section 28 and the joint 24 is ensured to be greater than the size of water droplets generated by condensation, so that even if frost or ice generated in the copper U-shaped section 28 grows, it is difficult for it to reach the joint 24. Therefore, even if the frost or ice generated in the copper U-shaped section 28 melts during defrosting operation, water containing copper ions is generated in the joint 24, and it is possible to prevent it from reaching the aluminum refrigerant tube 22.

また、アルミニウム冷媒管２２は、接合部２４の上方の位置でベース３に対して平行に延在するアルミニウム直線部２５と、アルミニウム直線部２５と接合部２４の間で上側に凸形状に配置されたアルミニウムＵ字部２６とが設けられているので、圧縮機による振動が銅冷媒管２３を介して熱交換器側接合部２９に伝達することを抑制できる。 The aluminum refrigerant tube 22 also has an aluminum straight section 25 that extends parallel to the base 3 above the joint 24, and an aluminum U-shaped section 26 that is arranged in a convex shape on the upper side between the aluminum straight section 25 and the joint 24, so that vibrations caused by the compressor can be prevented from being transmitted to the heat exchanger side joint 29 via the copper refrigerant tube 23.

また、アルミニウム直線部２５とチューブ１８の一端１８ａとの熱交換器側接合部２９は、接合部２４及び銅冷媒管２３の銅Ｕ字部２８に対して上方の位置に配置されているので、図５で示す傾斜設置状態であっても、銅Ｕ字部２８に溜まった銅イオンを含む水が、アルミニウム直線部２５及び熱交換器１１に流れるのが確実に防止される。
また、接合部２４の外周に防水被覆材３１が装着されて水密性が確保されていることから、銅イオンを含む水が接合部２４に流れるのが確実に防止される。 Furthermore, the heat exchanger-side joint 29 between the aluminum straight section 25 and one end 18a of the tube 18 is positioned above the joint 24 and the copper U-shaped section 28 of the copper refrigerant tube 23. Therefore, even in the inclined installation state shown in FIG. 5, water containing copper ions that has accumulated in the copper U-shaped section 28 is reliably prevented from flowing into the aluminum straight section 25 and the heat exchanger 11.
Furthermore, since a waterproof covering material 31 is attached to the outer periphery of the joint 24 to ensure watertightness, water containing copper ions is reliably prevented from flowing into the joint 24 .

したがって、熱交換器１１が傾斜面に設置されていても、第１冷媒管２０の接合部２４が上下方向に沿って配置されているので、銅イオンを含む水が銅冷媒管２３（銅直線部２７）及びアルミニウム冷媒管２２（第２直線部２６ｂ）の接合部２４に流れず、アルミニウム冷媒管２２（第２直線部２６ｂ）の電蝕を確実に防止することができる。
さらにまた、銅Ｕ字部２８と銅冷媒管３０との接合部は、端面同士を溶接で接合する際に、防水被覆材３１及びアルミニウム冷媒管２２に溶接バーナの火が直接当たらない程度の距離に配置されているので、銅Ｕ字部２８と銅冷媒管３０との溶接作業を容易且つ正確に行うことができる。 Therefore, even if the heat exchanger 11 is installed on an inclined surface, the joint 24 of the first refrigerant tube 20 is arranged along the vertical direction, so that water containing copper ions does not flow to the joint 24 of the copper refrigerant tube 23 (copper straight portion 27) and the aluminum refrigerant tube 22 (second straight portion 26 b), and electrolytic corrosion of the aluminum refrigerant tube 22 (second straight portion 26 b) can be reliably prevented.
Furthermore, the joint between the copper U-shaped portion 28 and the copper refrigerant tube 30 is positioned at a distance such that the flame from the welding burner does not directly strike the waterproof coating material 31 and the aluminum refrigerant tube 22 when the end faces are welded together, so that the welding work between the copper U-shaped portion 28 and the copper refrigerant tube 30 can be performed easily and accurately.

［第２、第３実施形態の接合部］
次に、図６及び図７は、図４で示したアルミニウム冷媒管２２（第２直線部２６ｂ）及び銅冷媒管２３（銅直線部２７）の第1実施形態の接合部２４とは異なる構造の第２及び第３実施形態の接合部を示すものである。
図６は、第２実施形態の接合部を示すものであり、銅直線部２７の上端部と第２直線部２６ｂの下端部との間にステンレス鋼管３２を配置し、銅直線部２７の上端部とステンレス鋼管３２の一端を溶接で接合し、第２直線部２６ｂの下端部とステンレス鋼管３２の他端を溶接で接合することで接合部３３が形成されている。そして、接合部３３、第２直線部２６ｂ及び銅直線部２７の外周に防水被覆材３１が装着されている。 [Joints of the second and third embodiments]
Next, FIGS. 6 and 7 show joints of second and third embodiments, which have a structure different from the joint 24 of the first embodiment of the aluminum refrigerant tube 22 (second straight portion 26b) and the copper refrigerant tube 23 (copper straight portion 27) shown in FIG. 4.
6 shows a joint in the second embodiment, in which a stainless steel pipe 32 is disposed between the upper end of the copper straight section 27 and the lower end of the second straight section 26b, the upper end of the copper straight section 27 is joined to one end of the stainless steel pipe 32 by welding, and the lower end of the second straight section 26b is joined to the other end of the stainless steel pipe 32 by welding to form a joint 33. A waterproof covering material 31 is attached to the outer periphery of the joint 33, the second straight section 26b, and the copper straight section 27.

第２実施形態は、銅冷媒管２３（銅直線部２７）及びアルミニウム冷媒管２２（第２直線部２６ｂ）の接合部３３が上下方向に沿って配置されているので、熱交換器１１が傾斜面に設置されていても、銅イオンを含む水が接合部３３に流れず、アルミニウム冷媒管２２（第２直線部２６ｂ）の電蝕を確実に防止することができる。 In the second embodiment, the joint 33 between the copper refrigerant tube 23 (copper straight section 27) and the aluminum refrigerant tube 22 (second straight section 26b) is arranged in the vertical direction, so that even if the heat exchanger 11 is installed on an inclined surface, water containing copper ions does not flow to the joint 33, and electrolytic corrosion of the aluminum refrigerant tube 22 (second straight section 26b) can be reliably prevented.

図７は、第２実施形態の接合部を示すものであり、銅直線部２７の上端部と第２直線部２６ｂの下端部とが突き合わされているとともに、銅直線部２７及び第２直線部２６ｂの外周に装着した継手部材３４により銅直線部２７及び第２直線部２６ｂが接合されることで接合部３５が形成されている。そして、接合部３５、第２直線部２６ｂ及び銅直線部２７の外周に防水被覆材３１が装着されている。 Figure 7 shows the joint of the second embodiment, in which the upper end of the copper straight portion 27 is butted against the lower end of the second straight portion 26b, and the copper straight portion 27 and the second straight portion 26b are joined by a joint member 34 attached to the outer periphery of the copper straight portion 27 and the second straight portion 26b to form a joint 35. A waterproof covering material 31 is attached to the outer periphery of the joint 35, the second straight portion 26b, and the copper straight portion 27.

第３実施形態は、銅冷媒管２３（銅直線部２７）及びアルミニウム冷媒管２２（第２直線部２６ｂ）の接合部３５が上下方向に沿って配置されているので、熱交換器１１が傾斜面に設置されていても、銅イオンを含む水が接合部３５に流れず、アルミニウム冷媒管２２（第２直線部２６ｂ）の電蝕を確実に防止することができる。 In the third embodiment, the joint 35 between the copper refrigerant tube 23 (copper straight section 27) and the aluminum refrigerant tube 22 (second straight section 26b) is arranged in the vertical direction, so that even if the heat exchanger 11 is installed on an inclined surface, water containing copper ions does not flow to the joint 35, and electrolytic corrosion of the aluminum refrigerant tube 22 (second straight section 26b) can be reliably prevented.

１ 室外機
２ 筐体
３ ベース
４ 前面パネル
５ 右側パネル
６ 左側パネル
７ 天板
８ ファンガード
１０ 圧縮機
１１ 熱交換器
１２ 膨張弁
１３ 送風ファン
１４ 電装ユニット
１５ 仕切り板
１６ 機械室
１７ 熱交換室
１８ チューブ
１８ａ チューブの一端
１８ｂ チューブの他端
１９ フィン
２０ 第１冷媒管
２１ 第２冷媒管
２２ アルミニウム冷媒管
２３ 銅冷媒管
２４ 接合部
２５ アルミニウム直線部
２６ アルミニウムＵ字部
２６ａ 第１直線部
２６ｂ 第２直線部
２６ｃ 半円弧部
２７ 銅直線部
２８ 銅Ｕ字部
２９ 熱交換器側接合部
３０ 銅冷媒管
３１ 防水被覆材
３２ ステンレス鋼管
３３ 接合部
３４ 継手部材
３５ 接合部 REFERENCE SIGNS LIST 1 Outdoor unit 2 Housing 3 Base 4 Front panel 5 Right side panel 6 Left side panel 7 Top plate 8 Fan guard 10 Compressor 11 Heat exchanger 12 Expansion valve 13 Blower fan 14 Electrical unit 15 Partition plate 16 Machine room 17 Heat exchange room 18 Tube 18a One end of tube 18b Other end of tube 19 Fin 20 First refrigerant tube 21 Second refrigerant tube 22 Aluminum refrigerant tube 23 Copper refrigerant tube 24 Joint 25 Aluminum straight section 26 Aluminum U-shaped section 26a First straight section 26b Second straight section 26c Semicircular arc section 27 Copper straight section 28 Copper U-shaped section 29 Heat exchanger side joint 30 Copper refrigerant tube 31 Waterproof coating material 32 Stainless steel tube 33 Joint 34 Joint member 35 Joint

Claims (5)

熱交換器の内部に設けたチューブの端部と接続して前記熱交換器の外部に突出しているアルミニウム製又はアルミニウム合金製のアルミニウム冷媒管と、
四方弁又は膨張弁に接続されている銅製又は銅合金製の銅冷媒管と、
前記アルミニウム冷媒管及び前記銅冷媒管を接合する接合部と、を有する冷凍サイクル装置において、
前記接合部は、前記熱交換器の底面に対して垂直な上下方向に沿って配置されており、
前記接合部より上側に前記アルミニウム冷媒管が配置されているとともに、
前記接合部より下側に配置した前記銅冷媒管に、当該銅冷媒管の外径以上の長さで前記接合部から下方に直線状に延在する銅直線部が設けられ、
前記銅直線部の下端に、下側に凸形状としたＵ字部が設けられているとともに、
前記アルミニウム冷媒管に、前記接合部に接合して上側に凸形状とした逆Ｕ字部が設けられており、
前記アルミニウム冷媒管には、前記接合部の上方の位置で前記熱交換器の底面に対して平行に延在し、前記逆Ｕ字部と連続するアルミニウム直線部が設けられていることを特徴とする冷凍サイクル装置。 an aluminum refrigerant tube made of aluminum or an aluminum alloy, which is connected to an end of a tube provided inside the heat exchanger and protrudes outside the heat exchanger;
A copper refrigerant pipe made of copper or copper alloy and connected to a four-way valve or an expansion valve;
a joint portion for joining the aluminum refrigerant pipe and the copper refrigerant pipe,
The joint portion is disposed along a vertical direction perpendicular to a bottom surface of the heat exchanger,
The aluminum refrigerant pipe is disposed above the joint,
The copper refrigerant tube disposed below the joint has a copper straight portion extending downward from the joint in a straight line with a length equal to or greater than the outer diameter of the copper refrigerant tube,
A U-shaped portion having a downward convex shape is provided at a lower end of the copper straight portion,
The aluminum refrigerant pipe is provided with an inverted U-shaped portion joined to the joint portion and having an upwardly convex shape,
a heat exchanger that is connected to the inverted U-shaped portion of the aluminum refrigerant pipe; 前記接合部及び前記銅直線部を覆う防水被覆材が設けられていることを特徴とする請求項１記載の冷凍サイクル装置。 The refrigeration cycle device according to claim 1, characterized in that a waterproof coating material is provided to cover the joints and the copper straight sections. 前記銅冷媒管の一端には前記接合部及び前記銅直線部を覆う防水被覆材が設けられており、
前記銅冷媒管の他端は第２の銅冷媒管と溶接により接合されており、当該第２の銅冷媒管及び前記Ｕ字部が接合された部位と前記接合部との間の距離は、前記防水被覆材及び前記アルミニウム冷媒管に溶接による熱的影響を与えない距離に設定されていることを特徴とする請求項１又は２に記載の冷凍サイクル装置。 A waterproof coating material is provided at one end of the copper refrigerant pipe to cover the joint portion and the copper straight portion,
3. The refrigeration cycle device according to claim 1, wherein the other end of the copper refrigerant tube is joined to a second copper refrigerant tube by welding, and a distance between the joint portion and a portion where the second copper refrigerant tube and the U- shaped portion are joined is set to a distance that does not cause a thermal effect due to welding on the waterproof coating material and the aluminum refrigerant tube. 前記チューブ及び前記アルミニウム冷媒管を接合する熱交換器側接合部は、前記接合部より上方の位置に配置されていることを特徴とする請求項１又は２に記載の冷凍サイクル装置。 3. The refrigeration cycle apparatus according to claim 1, wherein a heat exchanger-side joint portion for joining the tube and the aluminum refrigerant pipe is disposed at a position above the joint portion. 熱交換器の内部に設けたチューブの端部と接続して前記熱交換器の外部に突出しているアルミニウム製又はアルミニウム合金製のアルミニウム冷媒管と、
四方弁又は膨張弁に接続されている銅製又は銅合金製の銅冷媒管と、
前記アルミニウム冷媒管及び前記銅冷媒管を接合する接合部と、を有する冷凍サイクル装置において、
前記接合部は、前記熱交換器の底面に対して垂直な上下方向に沿って配置されており、
前記接合部より上側に前記アルミニウム冷媒管が配置されているとともに、
前記接合部より下側に配置した前記銅冷媒管に、当該銅冷媒管の外径以上の長さで前記接合部から下方に直線状に延在する銅直線部が設けられ、
前記銅直線部の下端に、下側に凸形状としたＵ字部が設けられているとともに、
前記アルミニウム冷媒管に、前記接合部に接合して上側に凸形状とした逆Ｕ字部が設けられており、
前記アルミニウム冷媒管は、前記熱交換器の下側に設けた前記チューブの端部と接続して前記熱交換器の外部に突出していることを特徴とする冷凍サイクル装置。 an aluminum refrigerant tube made of aluminum or an aluminum alloy, which is connected to an end of a tube provided inside the heat exchanger and protrudes outside the heat exchanger;
A copper refrigerant pipe made of copper or copper alloy and connected to a four-way valve or an expansion valve;
a joint portion for joining the aluminum refrigerant pipe and the copper refrigerant pipe,
The joint portion is disposed along a vertical direction perpendicular to a bottom surface of the heat exchanger,
The aluminum refrigerant pipe is disposed above the joint,
The copper refrigerant tube disposed below the joint has a copper straight portion extending downward from the joint in a straight line with a length equal to or greater than the outer diameter of the copper refrigerant tube,
A U-shaped portion having a downward convex shape is provided at a lower end of the copper straight portion,
The aluminum refrigerant pipe is provided with an inverted U-shaped portion joined to the joint portion and having an upwardly convex shape,
The aluminum refrigerant pipe is connected to an end of the tube provided below the heat exchanger and protrudes outside the heat exchanger .
JP2023046636A 2023-03-23 2023-03-23 Refrigeration Cycle Equipment Active JP7652205B2 (en)

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CN202480017727.2A CN120883014A (en) 2023-03-23 2024-03-21 Refrigeration cycle unit
PCT/JP2024/011097 WO2024195833A1 (en) 2023-03-23 2024-03-21 Refrigeration cycle device
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JP2005090761A (en) 2003-09-12 2005-04-07 Matsushita Electric Ind Co Ltd Air conditioner
JP2010112667A (en) 2008-11-10 2010-05-20 Mitsubishi Electric Corp Air conditioner
US20130125578A1 (en) 2011-11-18 2013-05-23 Juhyoung LEE Air conditioner
WO2013084433A1 (en) 2011-12-09 2013-06-13 パナソニック株式会社 Heat exchanger for air conditioner
JP2013130345A (en) 2011-12-22 2013-07-04 Daikin Industries Ltd Air conditioner
WO2016038865A1 (en) 2014-09-12 2016-03-17 パナソニックＩｐマネジメント株式会社 Outdoor unit and refrigeration cycle device using same
JP2018115774A (en) 2017-01-16 2018-07-26 日立ジョンソンコントロールズ空調株式会社 Connection piping structure for heat exchanger and air conditioner
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