WO2013005437A1 - Air conditioner - Google Patents

Air conditioner Download PDF

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Publication number
WO2013005437A1
WO2013005437A1 PCT/JP2012/004361 JP2012004361W WO2013005437A1 WO 2013005437 A1 WO2013005437 A1 WO 2013005437A1 JP 2012004361 W JP2012004361 W JP 2012004361W WO 2013005437 A1 WO2013005437 A1 WO 2013005437A1
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WO
WIPO (PCT)
Prior art keywords
heat exchanger
air conditioner
top plate
aluminum
outdoor heat
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PCT/JP2012/004361
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French (fr)
Japanese (ja)
Inventor
杉尾 孝
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パナソニック株式会社
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Publication of WO2013005437A1 publication Critical patent/WO2013005437A1/en

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/14Heat exchangers specially adapted for separate outdoor units
    • F24F1/16Arrangement or mounting thereof
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/56Casing or covers of separate outdoor units, e.g. fan guards

Definitions

  • the present invention relates to an outdoor unit of an air conditioner such as a room air conditioner or a packaged air conditioner, and more particularly to a local battery in a heat exchanger at the time of contact with dissimilar metals when rainwater or condensed water of a heat exchanger is present in the outdoor unit.
  • the present invention relates to prevention of the occurrence of electrolytic corrosion due to formation.
  • a cross fin tube heat exchanger As a heat exchanger provided in a conventional outdoor unit of an air conditioner, a cross fin tube heat exchanger is mainly used, and aluminum or an aluminum alloy is used as a fin material, and copper or copper is used as a refrigerant pipe. Often uses copper alloys.
  • a heat exchanger 102 including an aluminum refrigerant pipe is disposed on a bottom plate 118 formed of a steel plate via a spacer 131.
  • Configuration is adopted.
  • the spacer 131 is made of a metal that is electrically lower than aluminum (that is, a metal having a high ionization tendency) or a nonmetal such as a resin.
  • Patent Document 1 discloses a countermeasure against such corrosion. Not considered.
  • An object of the present invention is to solve the above-described problems, and is highly reliable that can appropriately prevent electrolytic corrosion (corrosion) occurring between the top plate and a heat exchanger having an aluminum or aluminum alloy refrigerant tube. It is to provide an air conditioner.
  • the present invention is configured as follows.
  • An air conditioner includes an outdoor heat exchanger therein, and an outdoor unit including a top plate disposed on an upper portion of the outdoor heat exchanger, wherein the outdoor heat exchanger is aluminum or It is comprised with the fin material and refrigerant
  • the schematic diagram which shows the structure of the air conditioner which is 1 type of the refrigerating-cycle apparatus which concerns on this Embodiment.
  • the model perspective view for demonstrating the structure of the whole outdoor unit with which the air conditioner of this Embodiment is provided.
  • Schematic front view showing main components in the outdoor unit of FIG.
  • Schematic sectional view showing the configuration of the pre-coated steel plate of the top plate in the outdoor unit of FIG.
  • the model perspective view which shows the structure principal part in the outdoor unit of the conventional air conditioner
  • An air conditioner is an outdoor unit that includes an outdoor heat exchanger therein and includes a top plate disposed at an upper portion of the outdoor heat exchanger, wherein the outdoor heat exchanger is made of aluminum or an aluminum alloy.
  • the top plate is formed of a pre-coated steel plate having resin layers on both sides of the galvanized steel plate.
  • a spacer formed of a metal that is electrically lower than aluminum is disposed between the outdoor heat exchanger and the top plate. ing. Thereby, the direct contact with an outdoor heat exchanger and a top plate can be prevented, and generation
  • the spacer is made of zinc or a zinc alloy.
  • zinc-based spacers which have a higher ionization tendency than aluminum-based fin materials and refrigerant tubes, the spacer side is easily rusted to prevent corrosion of fin materials and refrigerant tubes, and the heat exchange efficiency of the outdoor heat exchanger Ensuring and preventing leakage of refrigerant in the refrigerant pipe.
  • a spacer made of a nonconductive material is disposed between the outdoor heat exchanger and the top plate. Thereby, the electric corrosion of an outdoor heat exchanger can be prevented.
  • the resin layers on both surfaces of the galvanized steel plate are formed of a polyester resin or a fluorine resin. I am doing so. Thereby, in addition to electric corrosion suppression, heat resistance can be improved further.
  • FIG. 1 is a schematic diagram illustrating a configuration of an air conditioner according to the present embodiment.
  • the air conditioner 1 includes an outdoor heat exchanger 2 that exhausts heat to the outside during cooling operation, an indoor heat exchanger 3 that absorbs heat from the outside, an outdoor heat exchanger 2, and an indoor heat exchanger 3.
  • a refrigeration cycle 4 composed of Further, in the vicinity of the outdoor heat exchanger 2 and the indoor heat exchanger 3 are provided outdoor, outdoor fans driven by indoor fan motors 5 and 6, and indoor fans 7, 8, respectively. The airflow generated by the rotational drive of 8 flows through the outdoor and indoor heat exchangers 2 and 3.
  • the expressions “upstream” and “downstream” are used for convenience, but these are “upstream” and “downstream” in the refrigerant flow in the refrigeration cycle 4 when the air conditioner 1 is in cooling operation.
  • subjected along the refrigerating cycle 4 shown in FIG. 1 has shown the direction where a refrigerant
  • the refrigerant flow during the heating operation is opposite to the refrigerant flow during the cooling operation, as indicated by an arrow (broken line).
  • the indoor heat exchanger 3 is provided with a refrigerant pipe 4 a that constitutes a part of the refrigeration cycle 4, and a refrigerant pipe 4 b is extended from the downstream end of the indoor heat exchanger 3 to connect the indoor unit. 10 (a connection part on the downstream side during cooling operation as viewed from the indoor heat exchanger 3).
  • Another refrigerant pipe 4c extends from the indoor unit connecting portion 10, and a refrigerant pipe 4d is connected to the downstream end of the indoor unit connection section 10 via a three-way valve 11. The downstream end is connected to the first port of the four-way valve 12. ing.
  • a refrigerant pipe 4e extends from a second port communicating with the first port during cooling operation, and its downstream end is connected to the compressor 13.
  • the compressor 13 compresses the low-temperature and low-pressure refrigerant returned from the indoor heat exchanger 3 during the cooling operation to increase the pressure, and the low-temperature and low-pressure refrigerant returned from the outdoor heat exchanger 2 during the heating operation. It compresses and raises pressure and temperature.
  • a normal accumulator is connected in front of the compressor 13 to perform gas-liquid separation of the refrigerant so that the liquid refrigerant does not return to the compressor 13.
  • refrigerant pipe 4 f is extended from the compressor 13, and its downstream end is connected to the third port of the four-way valve 12.
  • a refrigerant pipe 4g is extended from the remaining fourth port communicating with the third port during cooling operation, and the downstream end of the refrigerant pipe 4h provided in the outdoor heat exchanger 2 is provided. Connected to the upstream end.
  • Another refrigerant pipe 4 i extends from the downstream end of the refrigerant pipe 4 h in the outdoor heat exchanger 2, and the downstream end is connected to the expansion valve 14.
  • the expansion valve 14 depressurizes the refrigerant from the outdoor heat exchanger 2 to the indoor heat exchanger 3 during the cooling operation, and depressurizes the refrigerant from the indoor heat exchanger 3 to the outdoor heat exchanger 2 during the heating operation. To do.
  • Another refrigerant pipe 4 j extends from the expansion valve 14, and its downstream end is connected to one port of the two-way valve 15.
  • a refrigerant pipe 4k extends from the other port of the two-way valve 15, and its downstream end is connected to the indoor unit connection part 16 (upstream connection part during cooling operation as viewed from the indoor heat exchanger 3). Has been.
  • another refrigerant pipe 4m is extended from this indoor unit connection part 16, and the downstream end is connected to the upstream end of the refrigerant pipe 4a in the indoor heat exchanger 3 mentioned above.
  • the refrigerant pipes 4a to 4k, 4m constitute the refrigeration cycle 4, and by this refrigeration cycle 4, the indoor heat exchanger 3, the four-way valve 12, the compressor 13, the outdoor heat exchanger 3, the expansion valve 14 etc. are connected.
  • the components from the three-way valve 11 to the two-way valve 15 along the refrigerant flow (that is, the four-way valve 12, the compressor 13, the outdoor heat exchanger 2, and the expansion valve 14 are included. ) Constitutes an outdoor unit 1A of the air conditioner 1 according to the present embodiment.
  • the indoor unit 1B of the air conditioner 1 is configured by the components from the indoor unit connection unit 16 to the indoor unit connection unit 10 (that is, including the indoor heat exchanger 3) along the refrigerant flow. Yes.
  • FIGS. 2 is an exploded perspective view showing only main components of the outdoor unit 1A
  • FIG. 3 is a longitudinal sectional view of the outdoor unit 1A.
  • the outdoor unit 1A of the air conditioner 1 includes an outdoor heat exchanger 2 having a substantially L shape in a plan view (that is, a top view), a bottom plate 18 that forms the bottom of the casing of the outdoor unit 1A, and a ceiling of the casing.
  • a compressor room is divided and a soundproof board 24 for preventing the sound of the compressor room from entering the air passage, a power box 25 in which electric parts are stored, a compressor 13 for compressing refrigerant, and a refrigerant forming a refrigerant circuit
  • a piping / refrigerant circuit component and an outdoor fan 7 for blowing air to the outdoor heat exchanger 2 are provided.
  • the outdoor heat exchanger 2 includes a refrigerant tube 4h made of aluminum or aluminum alloy and a fin material 26 made of aluminum or aluminum alloy.
  • the top plate 19 includes a steel plate 28 having a galvanized layer (galvanized steel plate), a chemical conversion film 29 disposed on both surfaces of the steel plate 28, and a polyester or fluorine-based material disposed on the outer surface of each chemical conversion film 29. It is formed as a precoated steel plate provided with the resin coating film 30. For example, the heat resistance of the top plate 19 can be increased by adopting a fluorine-based resin coating film as the resin coating film 30.
  • precoat means the product in which the steel plate manufacturer formed the resin coating film, and means that the coating is not performed after the top plate or the like is formed by pressing or the like.
  • zinc which is a metal (that is, a metal that is electrically lower than aluminum) having a higher ionization tendency than aluminum (or an aluminum alloy).
  • a spacer 31 formed of a metal such as zinc alloy, magnesium or magnesium alloy, or a non-conductive material such as resin, rubber, or foamed polyethylene.
  • the steel of the pre-coated steel plate forming the top plate has a lower ionization tendency than the aluminum or aluminum alloy refrigerant tube, but the galvanized layer, the resin coating 30 and the spacer 31 are provided between the steel plate 28 and the refrigerant tube 4h. Therefore, the top plate 19 can be prevented from coming into direct contact with the outdoor heat exchanger 2. Further, even in the case of the thin top plate 19 having a thin plate thickness, the spacer 31 prevents the top plate 19 and the outdoor heat exchanger 2 from contacting each other, and further, corrosion (electric corrosion) of the refrigerant pipe 4h can be suppressed. The heat exchange efficiency of the vessel 2 can be ensured and the refrigerant leakage of the refrigerant pipe 4h can be prevented.
  • top plate 19 is formed of a normal galvanized steel sheet or the like, rust is likely to be generated, and when the generated rust flows into the heat exchanger refrigerant pipe 4h with rainwater or the like, the iron content of the rust and the refrigerant pipe 4h Therefore, it is conceivable that electric corrosion occurs due to the formation of local batteries, and pitting corrosion occurs in the refrigerant tube of the heat exchanger.
  • rust does not easily occur in the thick (about 10 to 20 microns) resin coating film 30 provided in the top plate 19, and so-called rust is also unlikely to occur.
  • top plate 19 above the outdoor heat exchanger 2 is formed of a pre-coated steel plate, but the front plate 20, the left side plate 21, the right side plate 22, the soundproof plate 24, and the bottom plate 18.
  • Etc. may be formed of a pre-coated steel plate.
  • the present invention can provide an air conditioner that can more appropriately prevent corrosion of the aluminum refrigerant pipe in the outdoor heat exchanger.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Other Air-Conditioning Systems (AREA)

Abstract

An outdoor unit for an air conditioner has an outdoor heat exchanger therein and is provided with a top plate disposed at the upper part of the outdoor heat exchanger. The outdoor heat exchanger is configured from fin members and refrigerant pipes, the fin members and refrigerant pipes consisting of aluminum or an aluminum alloy, and the top plate is formed from pre-coated steel plate formed by providing resin layers on both surfaces of a galvanized steel plate. The configuration prevents electrical corrosion of the refrigerant pipes of the heat exchanger, the refrigerant pipes consisting of the aluminum or the aluminum alloy, and can provide an air conditioner having the highly reliable outdoor unit.

Description

空気調和機Air conditioner
 本発明は、ルームエアコン、パッケージエアコンなどの空気調和機の室外機に関するものであり、特に室外機において雨水や熱交換器の凝縮水が介在する場合の異種金属接触時に、熱交換器で局部電池形成により電食が発生することの防止に関するものである。 The present invention relates to an outdoor unit of an air conditioner such as a room air conditioner or a packaged air conditioner, and more particularly to a local battery in a heat exchanger at the time of contact with dissimilar metals when rainwater or condensed water of a heat exchanger is present in the outdoor unit. The present invention relates to prevention of the occurrence of electrolytic corrosion due to formation.
 従来の空気調和機の室外機に備えられている熱交換器としては、主にクロスフィンチューブ熱交換器が用いられており、フィン材としてアルミニウムあるいはアルミニウム合金を使用し、冷媒管としては銅または銅合金を使用していることが多い。 As a heat exchanger provided in a conventional outdoor unit of an air conditioner, a cross fin tube heat exchanger is mainly used, and aluminum or an aluminum alloy is used as a fin material, and copper or copper is used as a refrigerant pipe. Often uses copper alloys.
 しかしながら、軽量化や低コスト化といった要望から、近年では一部にアルミニウム又はアルミニウム合金で形成した管部材(アルミニウム製冷媒管)を使用することが提案されている。 However, due to demands for weight reduction and cost reduction, in recent years, it has been proposed to use a pipe member (aluminum refrigerant pipe) partially formed of aluminum or an aluminum alloy.
 ところが、アルミニウムはイオン化傾向が比較的大きい材質であるため、鉄や銅などの異種金属との接触によって腐食(電食)が生じやすい。また、このような腐食は、アルミニウムと鉄、銅との直接的な接触で生じる他、鉄、銅イオンを含む水滴がアルミニウムに接触することによっても生じる。特に、空気調和機では、暖房運転時には室外熱交換器の冷媒管内を低温の冷媒が通流するため、外気に含まれる水蒸気が結露して冷媒管に水滴が付着し、その水滴によってアルミニウムが腐食する可能性がある。 However, since aluminum is a material with a relatively high tendency to ionize, corrosion (electric corrosion) is likely to occur due to contact with dissimilar metals such as iron and copper. Such corrosion is caused not only by direct contact between aluminum and iron or copper, but also when water droplets containing iron or copper ions come into contact with aluminum. In particular, in air conditioners, low-temperature refrigerant flows through the refrigerant pipe of the outdoor heat exchanger during heating operation, so water vapor contained in the outside air is condensed and water droplets adhere to the refrigerant pipe, and the water droplets corrode aluminum. there's a possibility that.
 そのため、従来の空気調和機の室外機では、図5に示すように、アルミニウム製冷媒管を備える熱交換器102が鋼板により形成された底板118の上に、スペーサ131を介して配設された構成が採用されている。このスペーサ131はアルミニウムよりも電気的に卑な金属(すなわち、イオン化傾向の高い金属)、あるいは樹脂などの非金属で構成されている。 Therefore, in a conventional outdoor unit of an air conditioner, as shown in FIG. 5, a heat exchanger 102 including an aluminum refrigerant pipe is disposed on a bottom plate 118 formed of a steel plate via a spacer 131. Configuration is adopted. The spacer 131 is made of a metal that is electrically lower than aluminum (that is, a metal having a high ionization tendency) or a nonmetal such as a resin.
特開2005-114273号公報JP 2005-114273 A
 上記特許文献1の場合、主に熱交換器102にて発生した凝縮水が下方に流れて、鋼板製の底板118と熱交換器102との間で腐食を起こすことに対して対策が打たれている。しかしながら、雨水等の場合は、むしろ上部の天板から熱交換器102へ水が流下してくることでの腐食も考えられるが、このような腐食に対しての対策については、特許文献1では考慮されていない。 In the case of the above-mentioned Patent Document 1, countermeasures are taken against the occurrence of corrosion between the bottom plate 118 made of steel plate and the heat exchanger 102 due to the condensed water generated mainly in the heat exchanger 102 flowing downward. ing. However, in the case of rainwater or the like, corrosion due to water flowing down from the upper top plate to the heat exchanger 102 is also conceivable. However, Patent Document 1 discloses a countermeasure against such corrosion. Not considered.
 本発明の目的は、上述の課題を解決することにあり、天板とアルミニウム又はアルミニウム合金製冷媒管を持つ熱交換器との間で起きる電食(腐食)を適切に防止できる信頼性の高い空気調和機を提供することにある。 An object of the present invention is to solve the above-described problems, and is highly reliable that can appropriately prevent electrolytic corrosion (corrosion) occurring between the top plate and a heat exchanger having an aluminum or aluminum alloy refrigerant tube. It is to provide an air conditioner.
 上記目的を達成するために、本発明は以下のように構成する。 In order to achieve the above object, the present invention is configured as follows.
 本発明の一の態様に係る空気調和機は、室外熱交換器を内部に有し、前記室外熱交換器の上部に配置する天板を備えた室外機において、前記室外熱交換器がアルミニウム又はアルミニウム合金からなるフィン材及び冷媒管で構成され、前記天板が亜鉛めっき鋼板の両面に樹脂層を有するプレコート鋼板で形成される。 An air conditioner according to an aspect of the present invention includes an outdoor heat exchanger therein, and an outdoor unit including a top plate disposed on an upper portion of the outdoor heat exchanger, wherein the outdoor heat exchanger is aluminum or It is comprised with the fin material and refrigerant | coolant pipe | tube which consist of aluminum alloys, and the said top plate is formed with the precoat steel plate which has a resin layer on both surfaces of a galvanized steel plate.
 本発明によれば、天板とアルミニウム又はアルミニウム合金製冷媒管を持つ熱交換器との間で起きる電食(腐食)を適切に防止できる信頼性の高い空気調和機を提供できる。 According to the present invention, it is possible to provide a highly reliable air conditioner that can appropriately prevent electrolytic corrosion (corrosion) that occurs between a top plate and a heat exchanger having an aluminum or aluminum alloy refrigerant tube.
本実施の形態に係る冷凍サイクル装置の一種である空気調和機の構成を示す模式図The schematic diagram which shows the structure of the air conditioner which is 1 type of the refrigerating-cycle apparatus which concerns on this Embodiment. 本実施の形態の空気調和機が備える室外機の全体の構成を説明するための模式斜視図The model perspective view for demonstrating the structure of the whole outdoor unit with which the air conditioner of this Embodiment is provided. 図2の室外機における主要構成部品を示す模式正面図Schematic front view showing main components in the outdoor unit of FIG. 図2の室外機における天板のプレコート鋼板の構成を示す模式断面図Schematic sectional view showing the configuration of the pre-coated steel plate of the top plate in the outdoor unit of FIG. 従来の空気調和機の室外機における構成要部を示す模式斜視図The model perspective view which shows the structure principal part in the outdoor unit of the conventional air conditioner
 第1の発明の空気調和機は、室外熱交換器を内部に有し、前記室外熱交換器の上部に配置する天板を備えた室外機において、前記室外熱交換器がアルミニウム又はアルミニウム合金からなるフィン材及び冷媒管で構成され、前記天板が亜鉛めっき鋼板の両面に樹脂層を有するプレコート鋼板で形成される。 An air conditioner according to a first aspect of the present invention is an outdoor unit that includes an outdoor heat exchanger therein and includes a top plate disposed at an upper portion of the outdoor heat exchanger, wherein the outdoor heat exchanger is made of aluminum or an aluminum alloy. The top plate is formed of a pre-coated steel plate having resin layers on both sides of the galvanized steel plate.
 このような構成によれば、天板から伝わった雨水や熱交換器の凝縮水が、天板と熱交換器の間に溜まりこんだ場合においても、天板における亜鉛めっき鋼板と、アルミニウムあるいはアルミニウム合金製のフィン材及び冷媒管との間に樹脂層が配置されるため、亜鉛めっき鋼板とフィン材及び冷媒管とが水を介して直接接することが防止される。よって、室外熱交換器において局部電池形成による電食の発生を防止でき、信頼性の高い空気調和機を提供できる。 According to such a configuration, even when rainwater transmitted from the top plate or condensed water of the heat exchanger accumulates between the top plate and the heat exchanger, the galvanized steel plate on the top plate and aluminum or aluminum Since the resin layer is arranged between the alloy fin material and the refrigerant pipe, the galvanized steel sheet, the fin material and the refrigerant pipe are prevented from coming into direct contact with each other through water. Therefore, the occurrence of electrolytic corrosion due to the formation of local batteries in the outdoor heat exchanger can be prevented, and a highly reliable air conditioner can be provided.
 第2の発明は、第1の発明の空気調和機において、前記室外熱交換器と前記天板との間に、アルミニウムよりも電気的に卑な金属で形成されたスペーサが配置されるようにしている。これにより、室外熱交換器と天板との直接的な接触を防止でき、さらに電食の発生を抑制できる。 According to a second aspect of the present invention, in the air conditioner of the first aspect, a spacer formed of a metal that is electrically lower than aluminum is disposed between the outdoor heat exchanger and the top plate. ing. Thereby, the direct contact with an outdoor heat exchanger and a top plate can be prevented, and generation | occurrence | production of electrolytic corrosion can be suppressed further.
 第3の発明は、第2の発明の空気調和機において、前記スペーサは、亜鉛又は亜鉛合金で形成されるようにしている。アルミニウム系のフィン材や冷媒管よりもイオン化傾向の高い亜鉛系のスペーサにすることで、スペーサ側を錆びやすくしてフィン材や冷媒管の腐食を抑制し、室外熱交換器の熱交換効率の確保および冷媒管の冷媒漏れを防止できる。 According to a third aspect of the present invention, in the air conditioner of the second aspect, the spacer is made of zinc or a zinc alloy. By using zinc-based spacers, which have a higher ionization tendency than aluminum-based fin materials and refrigerant tubes, the spacer side is easily rusted to prevent corrosion of fin materials and refrigerant tubes, and the heat exchange efficiency of the outdoor heat exchanger Ensuring and preventing leakage of refrigerant in the refrigerant pipe.
 第4の発明は、第1の発明の空気調和機において、前記室外熱交換器と、前記天板との間に、非導電性の材質で形成されたスペーサが配置されるようにしている。これにより、室外熱交換器の電食を防止できる。 According to a fourth aspect of the present invention, in the air conditioner of the first aspect, a spacer made of a nonconductive material is disposed between the outdoor heat exchanger and the top plate. Thereby, the electric corrosion of an outdoor heat exchanger can be prevented.
 第5の発明は、第1から第4の発明の空気調和機において、前記天板を構成するプレコート鋼板において、亜鉛めっき鋼板の両面の前記樹脂層がポリエステル系樹脂あるいはフッ素系樹脂で形成されるようにしている。これにより、電食抑制に加えてさらに耐熱性を高めることができる。 According to a fifth invention, in the air conditioner of the first to fourth inventions, in the precoated steel plate constituting the top plate, the resin layers on both surfaces of the galvanized steel plate are formed of a polyester resin or a fluorine resin. I am doing so. Thereby, in addition to electric corrosion suppression, heat resistance can be improved further.
 以下、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。尚、この実施の形態によって本発明が限定されるものではない。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiment.
 (実施の形態)
 図1は、本実施の形態に係る空気調和機の構成を示す模式図である。図1に示すように空気調和機1は、冷房運転時に外部へ排熱する室外熱交換器2、外部から吸熱する室内熱交換器3と、室外熱交換器2と室内熱交換器3を含んで構成される冷凍サイクル4とを備えている。また、これら室外熱交換器2及び室内熱交換器3の近傍には、それぞれ室外、室内ファンモータ5,6によって駆動する室外、室内ファン7,8が設けられており、室外、室内ファン7,8の回転駆動により発生する気流が、室外、室内熱交換器2,3を経て流れるようになっている。
(Embodiment)
FIG. 1 is a schematic diagram illustrating a configuration of an air conditioner according to the present embodiment. As shown in FIG. 1, the air conditioner 1 includes an outdoor heat exchanger 2 that exhausts heat to the outside during cooling operation, an indoor heat exchanger 3 that absorbs heat from the outside, an outdoor heat exchanger 2, and an indoor heat exchanger 3. And a refrigeration cycle 4 composed of Further, in the vicinity of the outdoor heat exchanger 2 and the indoor heat exchanger 3 are provided outdoor, outdoor fans driven by indoor fan motors 5 and 6, and indoor fans 7, 8, respectively. The airflow generated by the rotational drive of 8 flows through the outdoor and indoor heat exchangers 2 and 3.
 なお、以下の説明では便宜上、「上流」及び「下流」という表現を用いるが、これらは、空気調和機1を冷房運転したときに冷凍サイクル4での冷媒の流れにおける「上流」及び「下流」を意味するものとする。そして、図1に示す冷凍サイクル4に沿って付された矢印(実線)は、冷房運転時に冷媒が「上流」から「下流」へ流れる向きを示している。また、付言しておくと、暖房運転をしたときの冷媒の流れは、冷房運転のときの冷媒の流れと逆向きになり、矢印(破線)で示す通りである。 In the following description, the expressions “upstream” and “downstream” are used for convenience, but these are “upstream” and “downstream” in the refrigerant flow in the refrigeration cycle 4 when the air conditioner 1 is in cooling operation. Means. And the arrow (solid line) attached | subjected along the refrigerating cycle 4 shown in FIG. 1 has shown the direction where a refrigerant | coolant flows from "upstream" to "downstream" at the time of air_conditionaing | cooling operation. In addition, the refrigerant flow during the heating operation is opposite to the refrigerant flow during the cooling operation, as indicated by an arrow (broken line).
 図1に示すように、室内熱交換器3内には冷凍サイクル4の一部を構成する冷媒管4aが備えられており、その下流端からは冷媒管4bが延設されて室内機接続部10(室内熱交換器3から見て、冷房運転時における下流側の接続部)に接続されている。この室内機接続部10からは別の冷媒管4cが延設され、その下流端には三方弁11を介して冷媒管4dが接続され、その下流端は四方弁12の第1ポートに接続されている。 As shown in FIG. 1, the indoor heat exchanger 3 is provided with a refrigerant pipe 4 a that constitutes a part of the refrigeration cycle 4, and a refrigerant pipe 4 b is extended from the downstream end of the indoor heat exchanger 3 to connect the indoor unit. 10 (a connection part on the downstream side during cooling operation as viewed from the indoor heat exchanger 3). Another refrigerant pipe 4c extends from the indoor unit connecting portion 10, and a refrigerant pipe 4d is connected to the downstream end of the indoor unit connection section 10 via a three-way valve 11. The downstream end is connected to the first port of the four-way valve 12. ing.
 四方弁12において、冷房運転時に第1ポートと連通する第2ポートからは冷媒管4eが延設され、その下流端は圧縮機13に接続されている。この圧縮機13は、冷房運転時においては室内熱交換器3から戻ってきた低温低圧の冷媒を圧縮して昇圧高温化し、暖房運転時において室外熱交換器2から戻ってきた低温低圧の冷媒を圧縮して昇圧高温化するものである。なお、図示していないが、圧縮機13の手前には通常アキュームレータが接続され、冷媒の気液分離を行い液冷媒が圧縮機13に戻らないようにしている。 In the four-way valve 12, a refrigerant pipe 4e extends from a second port communicating with the first port during cooling operation, and its downstream end is connected to the compressor 13. The compressor 13 compresses the low-temperature and low-pressure refrigerant returned from the indoor heat exchanger 3 during the cooling operation to increase the pressure, and the low-temperature and low-pressure refrigerant returned from the outdoor heat exchanger 2 during the heating operation. It compresses and raises pressure and temperature. Although not shown, a normal accumulator is connected in front of the compressor 13 to perform gas-liquid separation of the refrigerant so that the liquid refrigerant does not return to the compressor 13.
 また、圧縮機13からは別の冷媒管4fが延設され、その下流端は、四方弁12の第3ポートに接続されている。四方弁12において、冷房運転時に第3のポートと連通する残りの第4ポートからは冷媒管4gが延設されており、その下流端は室外熱交換器2内に備えられた冷媒管4hの上流端に接続されている。 Further, another refrigerant pipe 4 f is extended from the compressor 13, and its downstream end is connected to the third port of the four-way valve 12. In the four-way valve 12, a refrigerant pipe 4g is extended from the remaining fourth port communicating with the third port during cooling operation, and the downstream end of the refrigerant pipe 4h provided in the outdoor heat exchanger 2 is provided. Connected to the upstream end.
 この室外熱交換器2内の冷媒管4hの下流端からは別の冷媒管4iが延設され、その下流端は、膨張弁14に接続されている。この膨張弁14は、冷房運転時においては室外熱交換器2から室内熱交換器3へ向かう冷媒を降圧し、暖房運転時においては室内熱交換器3から室外熱交換器2へ向かう冷媒を降圧するものである。 Another refrigerant pipe 4 i extends from the downstream end of the refrigerant pipe 4 h in the outdoor heat exchanger 2, and the downstream end is connected to the expansion valve 14. The expansion valve 14 depressurizes the refrigerant from the outdoor heat exchanger 2 to the indoor heat exchanger 3 during the cooling operation, and depressurizes the refrigerant from the indoor heat exchanger 3 to the outdoor heat exchanger 2 during the heating operation. To do.
 膨張弁14からは別の冷媒管4jが延設されており、その下流端は二方弁15の一方のポートに接続されている。この二方弁15の他方のポートからは冷媒管4kが延設され、その下流端は室内機接続部16(室内熱交換器3から見て、冷房運転時における上流側の接続部)に接続されている。そして、この室内機接続部16からは別の冷媒管4mが延設され、その下流端は、上述した室内熱交換器3内の冷媒管4aの上流端に接続されている。 Another refrigerant pipe 4 j extends from the expansion valve 14, and its downstream end is connected to one port of the two-way valve 15. A refrigerant pipe 4k extends from the other port of the two-way valve 15, and its downstream end is connected to the indoor unit connection part 16 (upstream connection part during cooling operation as viewed from the indoor heat exchanger 3). Has been. And another refrigerant pipe 4m is extended from this indoor unit connection part 16, and the downstream end is connected to the upstream end of the refrigerant pipe 4a in the indoor heat exchanger 3 mentioned above.
 このようにして、冷媒管4a~4k、4mによって冷凍サイクル4が構成されており、この冷凍サイクル4によって、室内熱交換器3、四方弁12、圧縮機13、室外熱交換器3、膨張弁14などが接続されている。 In this way, the refrigerant pipes 4a to 4k, 4m constitute the refrigeration cycle 4, and by this refrigeration cycle 4, the indoor heat exchanger 3, the four-way valve 12, the compressor 13, the outdoor heat exchanger 3, the expansion valve 14 etc. are connected.
 また、上述した構成のうち、冷媒の流れに沿って三方弁11から二方弁15に至るまでの構成物(即ち、四方弁12、圧縮機13、室外熱交換器2、膨張弁14を含む)によって、本実施の形態に係る空気調和機1の室外機1Aが構成されている。また、冷媒の流れに沿って室内機接続部16から室内機接続部10へ至るまでの構成物(即ち、室内熱交換器3を含む)によって、空気調和機1の室内機1Bが構成されている。 Of the above-described configurations, the components from the three-way valve 11 to the two-way valve 15 along the refrigerant flow (that is, the four-way valve 12, the compressor 13, the outdoor heat exchanger 2, and the expansion valve 14 are included. ) Constitutes an outdoor unit 1A of the air conditioner 1 according to the present embodiment. Moreover, the indoor unit 1B of the air conditioner 1 is configured by the components from the indoor unit connection unit 16 to the indoor unit connection unit 10 (that is, including the indoor heat exchanger 3) along the refrigerant flow. Yes.
 なお、上述した各構成自体は何れも公知のものを採用することができる。また、このような空気調和機1による冷房運転及び暖房運転時の動作については公知であるため、ここではその説明を省略する。 It should be noted that any of the above-described configurations can be a known one. Moreover, since the operation | movement at the time of the air_conditioning | cooling operation and heating operation by such an air conditioner 1 is well-known, the description is abbreviate | omitted here.
 次に、図2および図3を用いて、本実施の形態に係る空気調和機1が備える室外機1Aの構成を説明する。なお、図2は、室外機1Aの主要な部品のみを示す分解斜視図であり、図3は、室外機1Aの縦断面図である。空気調和機1の室外機1Aは、平面視(すなわち上方視)で略L字形状を有する室外熱交換器2と、室外機1Aの筐体の底部を構成する底板18と、筐体の天面(上面)を構成する平板状の天板19と、筐体の前面を構成する前板20と、左右の側部を構成する左側板21および右側板22と、風路(送風機室)と圧縮機室を分け、風路に圧縮機室の音が入るのを防ぐ防音板24と、電気部品が収納される電源ボックス25と、冷媒を圧縮する圧縮機13と、冷媒回路を形成する冷媒配管・冷媒回路部品類と、室外熱交換器2に送風を行う室外送風機7とを備える。 Next, the configuration of the outdoor unit 1A included in the air conditioner 1 according to the present embodiment will be described with reference to FIGS. 2 is an exploded perspective view showing only main components of the outdoor unit 1A, and FIG. 3 is a longitudinal sectional view of the outdoor unit 1A. The outdoor unit 1A of the air conditioner 1 includes an outdoor heat exchanger 2 having a substantially L shape in a plan view (that is, a top view), a bottom plate 18 that forms the bottom of the casing of the outdoor unit 1A, and a ceiling of the casing. A flat top plate 19 constituting a surface (upper surface), a front plate 20 constituting a front surface of the housing, a left side plate 21 and a right side plate 22 constituting left and right side portions, and an air passage (blower room) A compressor room is divided and a soundproof board 24 for preventing the sound of the compressor room from entering the air passage, a power box 25 in which electric parts are stored, a compressor 13 for compressing refrigerant, and a refrigerant forming a refrigerant circuit A piping / refrigerant circuit component and an outdoor fan 7 for blowing air to the outdoor heat exchanger 2 are provided.
 図3に示すように、室外熱交換器2は、アルミニウム又はアルミニウム合金製の冷媒管4hと、アルミニウム又はアルミニウム合金製のフィン材26とを備える。 As shown in FIG. 3, the outdoor heat exchanger 2 includes a refrigerant tube 4h made of aluminum or aluminum alloy and a fin material 26 made of aluminum or aluminum alloy.
 次いで、室外機1Aの天板19の断面図である図4に基づき、天板19の構成について説明する。天板19は、亜鉛めっき層を持つ鋼板28(亜鉛めっき鋼板)と、鋼板28の両面に配置された化成皮膜29と、それぞれの化成被膜29の外表面に配置されたポリエステル系またはフッ素系の樹脂塗膜30とを備えるプレコート鋼板として形成されている。例えば、樹脂塗膜30としてフッ素系の樹脂塗膜を採用することにより、天板19の耐熱性を高めることができる。 Next, the configuration of the top plate 19 will be described based on FIG. 4 which is a cross-sectional view of the top plate 19 of the outdoor unit 1A. The top plate 19 includes a steel plate 28 having a galvanized layer (galvanized steel plate), a chemical conversion film 29 disposed on both surfaces of the steel plate 28, and a polyester or fluorine-based material disposed on the outer surface of each chemical conversion film 29. It is formed as a precoated steel plate provided with the resin coating film 30. For example, the heat resistance of the top plate 19 can be increased by adopting a fluorine-based resin coating film as the resin coating film 30.
 なお、ここでいうプレコートとは、鋼板製造業者が樹脂塗膜を形成した製品のことを言い、天板等の形状をプレス加工等で形成した後には塗装を行わないという意味である。 In addition, precoat here means the product in which the steel plate manufacturer formed the resin coating film, and means that the coating is not performed after the top plate or the like is formed by pressing or the like.
 図3に示すように、室外熱交換器2と天板19の間には、さらにアルミニウム(あるいはアルミニウム合金)よりイオン化傾向の高い金属(すなわちアルミニウムよりも電気的に卑な金属)材料である亜鉛又は亜鉛合金、マグネシウム又はマグネシウム合金等の金属か、あるいは樹脂やゴム、発泡ポリエチレンなどの非導電性の材質により形成されたスペーサ31を配する方がより望ましい。 As shown in FIG. 3, between the outdoor heat exchanger 2 and the top plate 19, zinc, which is a metal (that is, a metal that is electrically lower than aluminum) having a higher ionization tendency than aluminum (or an aluminum alloy), is used. Alternatively, it is more desirable to dispose a spacer 31 formed of a metal such as zinc alloy, magnesium or magnesium alloy, or a non-conductive material such as resin, rubber, or foamed polyethylene.
 天板を形成するプレコート鋼板の鋼は、アルミニウム又はアルミニウム合金の冷媒管よりもイオン化傾向が低いが、鋼板28と冷媒管4hの間に、亜鉛めっき層、樹脂塗膜30、さらにはスペーサ31が介在するため、天板19が室外熱交換器2に直接的に接触するのを防止することができる。また、板厚が薄くたわみやすい天板19の場合でもスペーサ31によって天板19と室外熱交換器2の接触を防止し、さらに冷媒管4hの腐食(電食)は抑制できるので、室外熱交換器2の熱交換効率の確保および冷媒管4hの冷媒漏れを防止できる。 The steel of the pre-coated steel plate forming the top plate has a lower ionization tendency than the aluminum or aluminum alloy refrigerant tube, but the galvanized layer, the resin coating 30 and the spacer 31 are provided between the steel plate 28 and the refrigerant tube 4h. Therefore, the top plate 19 can be prevented from coming into direct contact with the outdoor heat exchanger 2. Further, even in the case of the thin top plate 19 having a thin plate thickness, the spacer 31 prevents the top plate 19 and the outdoor heat exchanger 2 from contacting each other, and further, corrosion (electric corrosion) of the refrigerant pipe 4h can be suppressed. The heat exchange efficiency of the vessel 2 can be ensured and the refrigerant leakage of the refrigerant pipe 4h can be prevented.
 また、天板19が通常の亜鉛めっき鋼板等で形成されている場合、錆が発生し易く、発生した錆が雨水等で熱交換器冷媒管4hまで流れ込むと、その錆の鉄分と冷媒管4hで局部電池形成による電食が発生し熱交換器の冷媒管に孔食が発生することが考えられる。しかしながら、本実施の形態の室外機1Aでは、天板19が備える厚い(約10~20ミクロン)樹脂塗膜30で錆が発生しにくいため、このようないわゆるもらい錆も発生しにくい。 Further, when the top plate 19 is formed of a normal galvanized steel sheet or the like, rust is likely to be generated, and when the generated rust flows into the heat exchanger refrigerant pipe 4h with rainwater or the like, the iron content of the rust and the refrigerant pipe 4h Therefore, it is conceivable that electric corrosion occurs due to the formation of local batteries, and pitting corrosion occurs in the refrigerant tube of the heat exchanger. However, in the outdoor unit 1A of the present embodiment, rust does not easily occur in the thick (about 10 to 20 microns) resin coating film 30 provided in the top plate 19, and so-called rust is also unlikely to occur.
 なお、このような効果は、室外熱交換器2より上部にある天板19をプレコート鋼板で形成する場合に最も顕著だが、前板20、左側板21、右側板22、防音板24、底板18などもプレコート鋼板で形成しても良い。 Such an effect is most noticeable when the top plate 19 above the outdoor heat exchanger 2 is formed of a pre-coated steel plate, but the front plate 20, the left side plate 21, the right side plate 22, the soundproof plate 24, and the bottom plate 18. Etc. may be formed of a pre-coated steel plate.
 なお、上記様々な実施形態のうちの任意の実施形態を適宜組み合わせることにより、それぞれの有する効果を奏するようにすることができる。 It should be noted that, by appropriately combining arbitrary embodiments of the above-described various embodiments, the effects possessed by them can be produced.
 本発明は、室外熱交換器内のアルミニウム製冷媒管の腐食をより適切に防止することができる空気調和機を提供することができる。 The present invention can provide an air conditioner that can more appropriately prevent corrosion of the aluminum refrigerant pipe in the outdoor heat exchanger.
 本発明は、添付図面を参照しながら好ましい実施の形態に関連して充分に記載されているが、この技術の熟練した人々にとっては種々の変形や修正は明白である。そのような変形や修正は、添付した請求の範囲による本発明の範囲から外れない限りにおいて、その中に含まれると理解されるべきである。 Although the present invention has been fully described in connection with preferred embodiments with reference to the accompanying drawings, various changes and modifications will be apparent to those skilled in the art. Such changes and modifications are to be understood as being included therein, so long as they do not depart from the scope of the present invention according to the appended claims.
 2011年7月6日に出願された日本国特許出願No.2011-149814号の明細書、図面、及び特許請求の範囲の開示内容は、全体として参照されて本明細書の中に取り入れられるものである。 Japan Patent Application No. filed on July 6, 2011. The disclosures of the specification, drawings, and claims of 2011-149814 are incorporated herein by reference in their entirety.
 1 空気調和機
 1A 室外機
 1B 室内機
 2 室外熱交換器
 3 室内熱交換器
 4 冷凍サイクル
 4a 冷媒管
 4b 冷媒管
 4c 冷媒管
 4d 冷媒管
 4e 冷媒管
 4f 冷媒管
 4g 冷媒管
 4h 冷媒管(室外熱交換器、アルミニウム製冷媒管)
 4i 冷媒管
 4j 冷媒管
 4k 冷媒管
 4m 冷媒管
 5 室外ファンモータ
 6 室内ファンモータ
 7 室外ファン
 8 室内ファン
 10 室内機接続部
 11 三方弁
 12 四方弁
 13 圧縮機
 14 膨張弁
 15 二方弁
 18 底板
 19 天板
 20 前板
 21 左側板
 22 右側板
 24 防音板
 25 電源ボックス
 26 フィン材
 28 亜鉛めっき鋼板
 29 化成皮膜
 30 樹脂塗膜
 31 スペーサ
DESCRIPTION OF SYMBOLS 1 Air conditioner 1A Outdoor unit 1B Indoor unit 2 Outdoor heat exchanger 3 Indoor heat exchanger 4 Refrigeration cycle 4a Refrigerant tube 4b Refrigerant tube 4c Refrigerant tube 4d Refrigerant tube 4e Refrigerant tube 4f Refrigerant tube 4g Refrigerant tube 4h Refrigerant tube (outdoor heat) Exchanger, aluminum refrigerant pipe)
4i Refrigerant pipe 4j Refrigerant pipe 4k Refrigerant pipe 4m Refrigerant pipe 5 Outdoor fan motor 6 Indoor fan motor 7 Outdoor fan 8 Indoor fan 10 Indoor unit connection 11 Three-way valve 12 Four-way valve 13 Compressor 14 Expansion valve 15 Two-way valve 18 Bottom plate 19 Top plate 20 Front plate 21 Left side plate 22 Right side plate 24 Soundproof plate 25 Power supply box 26 Fin material 28 Galvanized steel plate 29 Chemical conversion film 30 Resin coating film 31 Spacer

Claims (5)

  1.  室外熱交換器を内部に有し、前記室外熱交換器の上部に配置する天板を備えた室外機において、前記室外熱交換器がアルミニウム又はアルミニウム合金からなるフィン材及び冷媒管で構成され、前記天板が亜鉛めっき鋼板の両面に樹脂層を有するプレコート鋼板で形成される、空気調和機。 In an outdoor unit having an outdoor heat exchanger inside and having a top plate disposed on the upper part of the outdoor heat exchanger, the outdoor heat exchanger is composed of a fin material made of aluminum or an aluminum alloy and a refrigerant pipe, An air conditioner in which the top plate is formed of a pre-coated steel plate having resin layers on both sides of a galvanized steel plate.
  2.  前記室外熱交換器と前記天板との間に、アルミニウムよりも電気的に卑な金属で形成されたスペーサが配置されている、請求項1に記載の空気調和機。 The air conditioner according to claim 1, wherein a spacer formed of a metal that is electrically lower than aluminum is disposed between the outdoor heat exchanger and the top plate.
  3.  前記スペーサは、亜鉛又は亜鉛合金で形成されている、請求項2に記載の空気調和機。 The air conditioner according to claim 2, wherein the spacer is made of zinc or a zinc alloy.
  4.  前記室外熱交換器と、前記天板との間に、非導電性の材質で形成されたスペーサが配置されている、請求項1に記載の空気調和機。 The air conditioner according to claim 1, wherein a spacer formed of a non-conductive material is disposed between the outdoor heat exchanger and the top plate.
  5.  前記天板を構成するプレコート鋼板において、亜鉛めっき鋼板の両面の前記樹脂層がポリエステル系樹脂あるいはフッ素系樹脂で形成される、請求項1から4のいずれか1つに記載の空気調和機。 The air conditioner according to any one of claims 1 to 4, wherein in the pre-coated steel plate constituting the top plate, the resin layers on both sides of the galvanized steel plate are formed of a polyester-based resin or a fluorine-based resin.
PCT/JP2012/004361 2011-07-06 2012-07-05 Air conditioner WO2013005437A1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
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JP2016084995A (en) * 2014-10-27 2016-05-19 ダイキン工業株式会社 Outdoor unit of refrigeration device
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EP3354994A4 (en) * 2016-11-29 2018-08-22 Mitsubishi Electric Corporation Air conditioner outdoor unit, and air conditioner provided with same
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