JP7442033B2 - Heat exchanger and air conditioner equipped with the same - Google Patents
Heat exchanger and air conditioner equipped with the same Download PDFInfo
- Publication number
- JP7442033B2 JP7442033B2 JP2019188327A JP2019188327A JP7442033B2 JP 7442033 B2 JP7442033 B2 JP 7442033B2 JP 2019188327 A JP2019188327 A JP 2019188327A JP 2019188327 A JP2019188327 A JP 2019188327A JP 7442033 B2 JP7442033 B2 JP 7442033B2
- Authority
- JP
- Japan
- Prior art keywords
- heat exchanger
- sacrificial anode
- coating film
- anode material
- brazing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000005219 brazing Methods 0.000 claims description 108
- 238000000576 coating method Methods 0.000 claims description 58
- 239000011248 coating agent Substances 0.000 claims description 57
- 239000010405 anode material Substances 0.000 claims description 45
- 239000011162 core material Substances 0.000 claims description 28
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 22
- 229910052782 aluminium Inorganic materials 0.000 claims description 17
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 229910000838 Al alloy Inorganic materials 0.000 claims description 12
- 229920006334 epoxy coating Polymers 0.000 claims description 12
- 239000003507 refrigerant Substances 0.000 claims description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 229910052710 silicon Inorganic materials 0.000 claims description 7
- 239000010703 silicon Substances 0.000 claims description 7
- JBQYATWDVHIOAR-UHFFFAOYSA-N tellanylidenegermanium Chemical compound [Te]=[Ge] JBQYATWDVHIOAR-UHFFFAOYSA-N 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 6
- 230000006866 deterioration Effects 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 3
- 150000003839 salts Chemical class 0.000 claims description 2
- 230000007797 corrosion Effects 0.000 description 62
- 238000005260 corrosion Methods 0.000 description 62
- 239000000463 material Substances 0.000 description 30
- 239000003973 paint Substances 0.000 description 28
- 239000010949 copper Substances 0.000 description 19
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 18
- 229910052802 copper Inorganic materials 0.000 description 18
- 239000012530 fluid Substances 0.000 description 17
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 14
- 238000005304 joining Methods 0.000 description 14
- 229910052725 zinc Inorganic materials 0.000 description 14
- 239000011701 zinc Substances 0.000 description 14
- 239000004593 Epoxy Substances 0.000 description 12
- 230000000694 effects Effects 0.000 description 11
- 206010040844 Skin exfoliation Diseases 0.000 description 10
- BRLQWZUYTZBJKN-UHFFFAOYSA-N Epichlorohydrin Chemical compound ClCC1CO1 BRLQWZUYTZBJKN-UHFFFAOYSA-N 0.000 description 8
- 229910045601 alloy Inorganic materials 0.000 description 6
- 239000000956 alloy Substances 0.000 description 6
- 238000009434 installation Methods 0.000 description 6
- 239000002923 metal particle Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000000047 product Substances 0.000 description 6
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 230000001154 acute effect Effects 0.000 description 4
- 230000012447 hatching Effects 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- YNQLUTRBYVCPMQ-UHFFFAOYSA-N Ethylbenzene Chemical compound CCC1=CC=CC=C1 YNQLUTRBYVCPMQ-UHFFFAOYSA-N 0.000 description 2
- 229910021607 Silver chloride Inorganic materials 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 2
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 239000004035 construction material Substances 0.000 description 2
- 125000003700 epoxy group Chemical group 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 238000010422 painting Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- 229910018473 Al—Mn—Si Inorganic materials 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 229910018643 Mn—Si Inorganic materials 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 229910000676 Si alloy Inorganic materials 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 239000003085 diluting agent Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000003618 dip coating Methods 0.000 description 1
- 239000003657 drainage water Substances 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 125000001033 ether group Chemical group 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- -1 flows Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 125000002485 formyl group Chemical class [H]C(*)=O 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- 150000002513 isocyanates Chemical class 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 238000007591 painting process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 238000007142 ring opening reaction Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000002210 silicon-based material Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
- XLOMVQKBTHCTTD-UHFFFAOYSA-N zinc oxide Inorganic materials [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 1
- RNWHGQJWIACOKP-UHFFFAOYSA-N zinc;oxygen(2-) Chemical compound [O-2].[Zn+2] RNWHGQJWIACOKP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
- F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
- F28F19/06—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings of metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/0059—Indoor units, e.g. fan coil units characterised by heat exchangers
- F24F1/0063—Indoor units, e.g. fan coil units characterised by heat exchangers by the mounting or arrangement of the heat exchangers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/22—Means for preventing condensation or evacuating condensate
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- 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
- F25B39/00—Evaporators; Condensers
-
- 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
- F25B39/00—Evaporators; Condensers
- F25B39/04—Condensers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
- F28F19/004—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using protective electric currents, voltages, cathodes, anodes, electric short-circuits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
- F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
- F28F19/04—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings of rubber; of plastics material; of varnish
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
- F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
- F28F21/081—Heat exchange elements made from metals or metal alloys
- F28F21/084—Heat exchange elements made from metals or metal alloys from aluminium or aluminium alloys
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- 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
- F25B2339/00—Details of evaporators; Details of condensers
- F25B2339/04—Details of condensers
- F25B2339/043—Condensers made by assembling plate-like or laminated elements
Landscapes
- 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)
- Laminated Bodies (AREA)
- Devices For Blowing Cold Air, Devices For Blowing Warm Air, And Means For Preventing Water Condensation In Air Conditioning Units (AREA)
- Air Filters, Heat-Exchange Apparatuses, And Housings Of Air-Conditioning Units (AREA)
Description
本発明は、熱交換器を構成する部材に用いられるブレージングシートと、当該ブレージングシート同士を接合する接合構造と、当該接合構造を有する熱交換器と、に関する。 The present invention relates to a brazing sheet used for a member constituting a heat exchanger, a joining structure for joining the brazing sheets together, and a heat exchanger having the joining structure.
一般的な熱交換器は、通常、管およびフィンを備えており、管の外周に複数のフィンが取り付けられた構成を有している。管の材料としては、銅（Ｃｕ）またはその合金（便宜上「銅材」と称する）が用いられてきたが、近年ではアルミニウム（Ａｌ）またはその合金（アルミニウム材）も用いられている。フィンの材料としては、一般的にはアルミニウム材が用いられている。 A typical heat exchanger usually includes a tube and fins, and has a configuration in which a plurality of fins are attached to the outer periphery of the tube. Copper (Cu) or its alloy (referred to as "copper material" for convenience) has been used as the material for the tube, but in recent years, aluminum (Al) or its alloy (aluminum material) has also been used. Aluminum is generally used as the material for the fins.
熱交換器の製造に際して、管にフィンを取り付けるためには、一般的にはろう材による接合が用いられる。管およびフィンのいずれもアルミニウム材製であれば、例えば、アルミニウム合金製の心材の少なくとも一方の面にろう材層がクラッド（被覆）されたブレージングシートが用いられる。管およびフィンの防食性を考慮すれば、心材の一方の面にろう材がクラッドされ他方の面に犠牲陽極材層がクラッドされたブレージングシートが用いられる。 In the manufacture of heat exchangers, bonding using a brazing material is generally used to attach fins to tubes. If both the tube and the fin are made of aluminum, a brazing sheet is used, for example, which has a core material made of aluminum alloy and at least one surface of which is clad with a brazing metal layer. Considering the corrosion resistance of the tubes and fins, a brazing sheet is used in which one surface of the core material is clad with a brazing material and the other surface is clad with a sacrificial anode material layer.
ろう材としては、一般的には、アルミニウム合金のろう付けに用いられるアルミニウム－シリコン（Ｓｉ）系合金が用いられ、犠牲陽極材としては、その電位を卑とするために、一般的にはアルミニウム合金に亜鉛（Ｚｎ）を添加したものが用いられる。代表的な犠牲陽極材としては、一般的なアルミニウム－シリコン系合金のろう材に亜鉛を添加したものが挙げられる。これにより、犠牲陽極材がろう材としても機能することになる。 The brazing material is generally an aluminum-silicon (Si) alloy used for brazing aluminum alloys, and the sacrificial anode material is generally aluminum in order to make its potential less base. An alloy to which zinc (Zn) is added is used. A typical sacrificial anode material is a general aluminum-silicon alloy brazing material with zinc added. This causes the sacrificial anode material to also function as a brazing material.
犠牲陽極材層がクラッドされたブレージングシートの一例としては、例えば、特許文献１に開示されるものが知られている。特許文献１は、自動車用熱交換器、特に流体（冷却水または冷媒等）の通路構成材に使用されるアルミニウム合金ブレージングシートを開示しており、良好なろう付け性と、ろう付け後の優れた強度および耐食性を実現するために、心材および犠牲陽極材の成分を調整している。 As an example of a brazing sheet clad with a sacrificial anode material layer, the one disclosed in Patent Document 1 is known, for example. Patent Document 1 discloses an aluminum alloy brazing sheet used in an automotive heat exchanger, particularly as a passage construction material for fluid (cooling water, refrigerant, etc.), and has good brazing properties and excellent post-brazing properties. The composition of the core material and sacrificial anode material is adjusted to achieve superior strength and corrosion resistance.
このブレージングシートでは、犠牲陽極材において、シリコン、鉄（Ｆｅ）およびマンガン（Ｍｎ）の含有量を０．１５質量％以下に規制している。これは、Ａｌ－Ｍｎ－Ｓｉ系またはＡｌ－Ｆｅ－Ｍｎ－Ｓｉ系の化合物の生成を抑制し、ろう付け後の強度低下を抑制するためである。また、このブレージングシートでは、心材においてもシリコンの含有量を０．１５質量％以下に規制するとともに、心材には銅が０．４０～１．２重量％の範囲内で添加されている。銅を添加する理由は、心材の強度向上とともに、心材の電位を貴にして犠牲陽極層等との電位差を大きくし、犠牲陽極作用による防食効果を向上させるためである。 In this brazing sheet, the content of silicon, iron (Fe), and manganese (Mn) in the sacrificial anode material is regulated to 0.15% by mass or less. This is to suppress the formation of Al-Mn-Si-based or Al-Fe-Mn-Si-based compounds and to suppress the decrease in strength after brazing. Furthermore, in this brazing sheet, the silicon content in the core material is regulated to 0.15% by mass or less, and copper is added to the core material within a range of 0.40 to 1.2% by weight. The reason for adding copper is to improve the strength of the core material, increase the potential of the core material, increase the potential difference with the sacrificial anode layer, etc., and improve the anticorrosion effect due to the sacrificial anode action.
また、犠牲陽極材層がクラッドされたブレージングシートの他の例としては、例えば、特許文献２に開示されるものが知られている。特許文献２も、自動車用熱交換器、特に流体の通路構成材に使用されるアルミニウム合金ブレージングシートを開示しており、両面に犠牲防食効果を備え、かつ、その片面にろう付機能を有し、さらに接合部の優先腐食を防止するために、心材および犠牲陽極材だけでなくろう材の成分も調整している。 Further, as another example of a brazing sheet clad with a sacrificial anode material layer, the one disclosed in Patent Document 2 is known, for example. Patent Document 2 also discloses an aluminum alloy brazing sheet used for automobile heat exchangers, particularly fluid passage construction materials, which has a sacrificial corrosion protection effect on both sides and a brazing function on one side. Furthermore, in order to prevent preferential corrosion of the joint, the composition of not only the core material and sacrificial anode material but also the brazing material is adjusted.
このブレージングシートでは、犠牲陽極材だけでなくろう材にも亜鉛（Ｚｎ）が添加されているとともに、ろう材にはさらに銅が０．１～０．６ｍａｓｓ％の範囲内で添加されており、心材にも銅が０．０５～１．２ｍａｓｓ％の範囲内で添加されている。それぞれの材料に対する銅の添加目的は異なっており、ろう材については、当該ろう材の電位を貴にするためであり、心材については、当該心材の強度を向上させるためである。 In this brazing sheet, zinc (Zn) is added not only to the sacrificial anode material but also to the brazing material, and copper is further added to the brazing material in a range of 0.1 to 0.6 mass%. Copper is also added to the core material within a range of 0.05 to 1.2 mass%. The purpose of adding copper to each material is different; for the brazing filler metal, it is to make the potential of the brazing filler metal more noble, and for the core material, it is to improve the strength of the core material.
特許文献１に開示のブレージングシートでは、心材への銅の添加により強度向上と犠牲陽極作用による防食効果の向上とを図っている。しかしながら、このブレージングシートでは、犠牲陽極材および心材のいずれもシリコンの含有量を０．１５質量％以下に制限している上に、心材については、銅以外の種々の金属元素の含有量についても細かく特定されている。そのため、心材および犠牲陽極材として用いることが可能な材料の選択肢の幅が小さくなってしまう。しかも、このブレージングシートでは、犠牲陽極材のシリコンの含有量をごく少量に規制している。そのため、この犠牲陽極材層は、一般的なろう材としての機能を有さないと考えられる。 In the brazing sheet disclosed in Patent Document 1, copper is added to the core material to improve the strength and to improve the anticorrosion effect by sacrificial anode action. However, in this brazing sheet, the content of silicon in both the sacrificial anode material and the core material is limited to 0.15% by mass or less, and the content of various metal elements other than copper in the core material is also limited. are specified in detail. Therefore, the range of choices of materials that can be used as the core material and the sacrificial anode material is reduced. Moreover, in this brazing sheet, the content of silicon in the sacrificial anode material is limited to a very small amount. Therefore, this sacrificial anode material layer is considered not to have a function as a general brazing material.
特許文献２に開示のブレージングシートでは、ろう材に亜鉛とともに銅を添加することで、ろう付けの接合部に亜鉛が濃縮されるだけでなく銅も同様に濃縮される。そのため、この銅の濃縮（含有）により当該接合部の電位が亜鉛により卑化し過ぎることの防止を図っている。しかしながら、銅と亜鉛とを併用すると、犠牲陽極材層の優先腐食作用が低減して耐食性の低下が生じる。 In the brazing sheet disclosed in Patent Document 2, by adding copper together with zinc to the brazing material, not only the zinc is concentrated in the brazed joint, but also the copper is concentrated as well. Therefore, by concentrating (containing) copper, the potential of the junction is prevented from becoming too base due to zinc. However, when copper and zinc are used together, the preferential corrosion effect of the sacrificial anode material layer is reduced, resulting in a decrease in corrosion resistance.
例えば、熱交換器の種類によっては、ブレージングシート同士を互いに接合したときに、それぞれの接合面により形成される角度が鋭角となるような構造が含まれる。便宜上、このような構造を「鋭角接合構造」とし、ブレージングシートの接合面に隣接して接合されない面を「非接合隣接面」とすると、このような鋭角接合構造では、互いに鋭角を成す非接合隣接面の間にフィレットが形成される。このフィレットは、本明細書では、接合時に接合面から流出したろう材または犠牲陽極材が固化したものとして定義する。 For example, depending on the type of heat exchanger, there is a structure in which when brazing sheets are joined to each other, the angle formed by each joint surface is an acute angle. For convenience, such a structure is referred to as an "acute angle joint structure", and the surface adjacent to the joint surface of the brazing sheet that is not joined is referred to as a "non-joint adjacent surface". A fillet is formed between adjacent surfaces. The fillet is defined herein as a solidified brazing filler metal or sacrificial anode material that has flowed out from the bonding surface during bonding.
特許文献２のように銅と亜鉛とを併用した場合、フィレットには、前記の通り、電位を卑とする亜鉛と電位を貴とする銅とが共存することになる。犠牲陽極材層が予め銅を含有する構成であれば、フィレットにおいては、銅により電位が貴化し過ぎて亜鉛による犠牲陽極作用が低減し、フィレットの耐食性が低下するおそれがある。この場合、フィレットから接合部に腐食が進行して接合部の接合強度の低下を招く可能性がある。 When copper and zinc are used together as in Patent Document 2, as described above, zinc, which has a base potential, and copper, which has a noble potential, coexist in the fillet. If the sacrificial anode material layer contains copper in advance, the potential in the fillet becomes too noble due to the copper, reducing the sacrificial anode effect due to zinc, and there is a risk that the corrosion resistance of the fillet may decrease. In this case, corrosion may progress from the fillet to the joint, resulting in a decrease in the joint strength of the joint.
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って、ブレージングシート同士の接合部に隣接して生じるフィレットが亜鉛のみ、もしくは銅および亜鉛を含有する場合であっても、当該フィレットの優先腐食を有効に抑制または防止し、熱交換器の耐食性を良好なものとすることを目的とする。 The present invention has been made to solve such problems, and even if the fillet that occurs adjacent to the joint between brazing sheets contains only zinc or copper and zinc, the fillet The purpose is to effectively suppress or prevent preferential corrosion of heat exchangers and to improve the corrosion resistance of heat exchangers.
本発明に係る熱交換器は、前記の課題を解決するために、ブレージングシート同士の接合部を保護するため、接合部をヘッダー部に集中させ、当該接合部よりも電位が卑である金属粒子を含有するエポキシ系塗料を当該箇所およびその周囲のみに上塗りした構成である。さらには、前記熱交換器を備えた空気調和装置として、熱交換器の塗膜を保護するため、紫外線が侵入しないよう箱体内に熱交換器を設置し、熱交換を促進するため前記箱体内に送風ファンを備え、経年劣化による剥離塗膜や腐食生成物が前記送風により空気調和の目的とする空間に排出されないよう前記塗装部が非通風部となるよう熱交換器を配置し、その直下に排水受けを設けた構成である。 In order to solve the above problems, the heat exchanger according to the present invention concentrates the joints in the header part in order to protect the joints between the brazing sheets, and metal particles whose potential is less noble than the joints. The structure is such that only the area concerned and its surroundings are overcoated with an epoxy paint containing . Furthermore, as an air conditioner equipped with the heat exchanger, the heat exchanger is installed inside the box to prevent ultraviolet rays from entering in order to protect the coating film of the heat exchanger, and the heat exchanger is installed inside the box to promote heat exchange. A heat exchanger is arranged so that the painted area is a non-ventilated area so that peeling paint film and corrosion products due to aging deterioration are not discharged into the space intended for air conditioning by the air blowing, and a heat exchanger is placed directly below the painted area. The structure is equipped with a drainage receptacle.
前記構成によれば、電位が相対的に卑であるブレージングシート同士の接合部が、さらに卑である金属粒子の犠牲陽極作用によって保護される。また、塗装部にはアルミニウム材との良好な密着性を有するエポキシ系塗料を用い、その欠点である耐候性を構造的に保護することで塗膜の劣化や剥離を抑制している。その結果、フィレットから接合部に腐食が進行して接合部の接合強度の低下を招くおそれを有効に抑制または防止することができるので、熱交換器の接合部における耐食性をより一層良好なものとすることができる。さらには、前記塗膜の剥離物や前記金属粒子由来の腐食生成物を前記熱交換器の運転時に生ずる結露水で洗い流すことで、それらの飛散による周囲の環境汚染を抑制することができる。 According to the above configuration, the joint portion between the brazing sheets whose potential is relatively base is protected by the sacrificial anodic action of the metal particles whose potential is relatively base. In addition, an epoxy paint that has good adhesion to aluminum materials is used for the painted parts, and by structurally protecting the weather resistance, which is a drawback of epoxy paint, deterioration and peeling of the paint film is suppressed. As a result, it is possible to effectively suppress or prevent corrosion from progressing from the fillet to the joint, resulting in a decrease in the joint strength of the joint, thereby improving the corrosion resistance of the joint of the heat exchanger. can do. Furthermore, by washing off the peeled off paint film and corrosion products derived from the metal particles with dew water generated during operation of the heat exchanger, it is possible to suppress surrounding environmental pollution caused by their scattering.
本発明では、以上の構成により、ブレージングシート同士の接合部に隣接して生じるフィレットの電位がその周囲よりも卑な場合であっても、当該フィレットの優先腐食を簡便かつ有効に抑制または防止し、熱交換器の耐食性を良好なものとすることができる、という効果を奏する。 In the present invention, with the above configuration, even if the potential of the fillet that occurs adjacent to the joint between brazing sheets is lower than that of the surrounding area, preferential corrosion of the fillet can be simply and effectively suppressed or prevented. , it is possible to improve the corrosion resistance of the heat exchanger.
本発明に係る熱交換器は、前記の課題を解決するために、ブレージングシート同士の接合部を保護するため、接合部をヘッダー部に集中させ、当該接合部よりも電位が卑である金属粒子を含有するエポキシ系塗料を当該箇所およびその周囲のみに上塗りした構成である。 In order to solve the above problems, the heat exchanger according to the present invention concentrates the joints in the header part in order to protect the joints between the brazing sheets, and metal particles whose potential is less noble than the joints. The structure is such that only the area concerned and its surroundings are overcoated with an epoxy paint containing .
なお、ここで電位の評価方法は特に限定されず、公知の方法を好適に用いることができる。代表的には、ポテンショスタット／ガルバノスタットに、電位測定用の試料（例えば、ブレージングシート１０、もしくは、心材１１、ろう材、犠牲陽極材、フィレット２２または接合部２１、あるいはこれらを模擬した組成の合金等）と、対極と、参照電極（例えば銀／塩化銀（Ａｇ／ＡｇＣｌ）電極）とを接続して電解液（例えば５重量＆の塩化ナトリウム（ＮａＣｌ）溶液）に浸漬し、試料と参照電極との電位差を測定する方法を挙げることができる。 Note that the method for evaluating the potential is not particularly limited here, and known methods can be suitably used. Typically, a sample for potential measurement (for example, a brazing sheet 10, a core material 11, a brazing material, a sacrificial anode material, a fillet 22 or a joint 21, or a composition simulating these) is typically attached to the potentiostat/galvanostat. Connect the counter electrode (e.g., silver/silver chloride (Ag/AgCl) electrode), immerse it in an electrolytic solution (e.g., 5% sodium chloride (NaCl) solution), and connect the sample and reference electrode. A method of measuring the potential difference with an electrode can be mentioned.
防食塗装としては一般的に、アルミニウム材との好適な密着強度が得られるエポキシ系塗料を下塗りとし、下塗り塗膜を紫外線から保護する目的でウレタン系等の塗料を上塗りとする複数層の構成を用いるが、２コート目以降はコスト抑制・環境保護の観点から望ましくない。発明者らの検討の結果、塗装部への紫外線の侵入を十分抑制する構造であれば、熱交換器として十分な耐食寿命の向上が図れることが明らかとなった。また、塗装の必要がある接合部をヘッダー部に集中させることで、例えばディップ塗装により複雑な形状でも一度に塗装可能で、より簡便に熱交換器を生産でき、環境への負荷も低減することが可能である。また、ヘッダー部であれば、熱交換効率がフィン部や伝熱管部に比べて良くないため、そこを相対的な非通風部とすることにより効率低下を最小限にすることができる。 Anticorrosive coatings generally have a multi-layer structure, with an epoxy paint as an undercoat that provides suitable adhesion strength to the aluminum material, and a top coat of urethane paint to protect the undercoat from ultraviolet rays. However, the second and subsequent coats are not desirable from the viewpoint of cost reduction and environmental protection. As a result of studies conducted by the inventors, it has become clear that a structure that sufficiently suppresses the penetration of ultraviolet rays into the painted portion can sufficiently improve the corrosion-resistant life of the heat exchanger. In addition, by concentrating the joints that require painting on the header, for example, even complex shapes can be painted at once using dip coating, making it easier to produce heat exchangers and reducing the burden on the environment. is possible. Furthermore, since the heat exchange efficiency of the header section is not as good as that of the fin section or the heat exchanger tube section, the reduction in efficiency can be minimized by making this a relatively non-ventilated section.
また、ヘッダー部が熱交換器の鉛直最下部に位置するよう熱交換器を設置する構成では、その運転時に生ずる結露水により、剥離塗膜や腐食生成物の洗い流しをより確実なものとできる。その結果、剥離塗膜や腐食生成物の飛散を有効に抑制または防止することができる。 Furthermore, in a configuration in which the heat exchanger is installed such that the header portion is located at the vertically lowest position of the heat exchanger, the peeled coating film and corrosion products can be washed away more reliably by the condensed water generated during operation. As a result, it is possible to effectively suppress or prevent scattering of peeled coating films and corrosion products.
以下、本発明の代表的な実施の形態を、図面を参照しながら説明する。なお、以下ではすべての図を通じて同一または相当する要素には同一の参照符号を付して、その重複する説明を省略する。 Hereinafter, typical embodiments of the present invention will be described with reference to the drawings. In addition, below, the same reference numerals are given to the same or equivalent element throughout all the figures, and the redundant explanation will be omitted.
（実施の形態１）
［ブレージングシート］
本開示に係るブレージングシートは、熱交換器に用いられるアルミニウム合金製である。具体的には、例えば、図１（Ａ）に示すように、本開示に係るブレージングシート１０は、心材１１、ろう材層１２、および犠牲陽極材層１３を備えている。ろう材層１２は、心材１１の一方の面に被覆（クラッド）され、犠牲陽極材層１３は心材１１の他方の面すなわちろう材層１２が被覆されている面とは反対側の面に被覆されている。心材１１、ろう材層１２を構成するろう材、および、犠牲陽極材層１３を構成する犠牲陽極材はいずれもアルミニウム合金である。
(Embodiment 1)
[Blazing sheet]
The brazing sheet according to the present disclosure is made of an aluminum alloy used for heat exchangers. Specifically, for example, as shown in FIG. 1(A), a brazing sheet 10 according to the present disclosure includes a core material 11, a brazing material layer 12, and a sacrificial anode material layer 13. The brazing material layer 12 is coated (clad) on one surface of the core material 11, and the sacrificial anode material layer 13 is coated on the other surface of the core material 11, that is, the surface opposite to the surface covered with the brazing material layer 12. has been done. The core material 11, the brazing material forming the brazing material layer 12, and the sacrificial anode material forming the sacrificial anode material layer 13 are all made of an aluminum alloy.
あるいは図示しないが、本開示に係るブレージングシート１０は、心材１１および犠牲陽極材層１３を備え、ろう材層１２を備えていない構成でもよい。このようなブレージングシート１０では、心材１１の両方の面に犠牲陽極材層１３が形成されている。 Alternatively, although not shown, the brazing sheet 10 according to the present disclosure may include a core material 11 and a sacrificial anode material layer 13, but may not include a brazing material layer 12. In such a brazing sheet 10, sacrificial anode material layers 13 are formed on both surfaces of the core material 11.
本開示に係るブレージングシート１０は、少なくとも犠牲陽極材層１３の側に接合面を有しており、この接合面同士を互いに接合することで接合部を形成する。ブレージングシート１０同士を接合面で接合した構造が、本開示に係るブレージングシート１０の接合構造である。本開示に係るブレージングシート１０は、接合面に隣接する非接合隣接面を有する。ブレージングシート１０同士を接合して接合構造を形成したときには、それぞれの非接合隣接面により形成される角度は鋭角となっている。 The brazing sheet 10 according to the present disclosure has a bonding surface at least on the sacrificial anode material layer 13 side, and a bonding portion is formed by bonding the bonding surfaces to each other. A structure in which the brazing sheets 10 are joined together at the joining surfaces is a joining structure of the brazing sheets 10 according to the present disclosure. The brazing sheet 10 according to the present disclosure has a non-bonded adjacent surface adjacent to a bonded surface. When the brazing sheets 10 are bonded together to form a bonded structure, the angle formed by each non-bonded adjacent surface is an acute angle.
本開示に係る接合構造２０では、ブレージングシート１０同士を接合して接合部２１を構成したときに、図１（Ｂ）に示すように、非接合隣接面１０ｂ同士の間にフィレット２２が形成される。熱交換器には、このようなフィレット２２が形成される部材または構造等を含んでおり、このような部材または構造等においては、非接合隣接面１０ｂ同士が鋭角を成していることが多い。このフィレット２２は、本実施の形態では、接合時に接合面１０ａから流出したろう材（または犠牲陽極材）が固化したものとして定義される。 In the bonded structure 20 according to the present disclosure, when the brazing sheets 10 are bonded together to form the bonded portion 21, a fillet 22 is formed between the non-bonded adjacent surfaces 10b, as shown in FIG. 1(B). Ru. The heat exchanger includes a member or structure in which such a fillet 22 is formed, and in such a member or structure, the non-joined adjacent surfaces 10b often form an acute angle. . In this embodiment, the fillet 22 is defined as solidified brazing material (or sacrificial anode material) that has flowed out from the joint surface 10a during joining.
本開示では、ブレージングシート１０を用いた熱交換器において、このフィレット２２が優先的に腐食することを有効に抑制または回避するものである。 In the present disclosure, in a heat exchanger using the brazing sheet 10, preferential corrosion of the fillet 22 is effectively suppressed or avoided.
本開示に係るブレージングシート１０では、接合面１０ａが少なくとも犠牲陽極材層１３の上に設定されていればよい。したがって、後述するように、犠牲陽極材はろう材を兼ねている。すなわち、犠牲陽極材層１３は、接合時にはろう材としてブレージングシート１０同士の接合に寄与し、接合後には犠牲陽極材としてブレージングシート１０の防食効果に寄与する。 In the brazing sheet 10 according to the present disclosure, it is sufficient that the bonding surface 10a is set at least on the sacrificial anode material layer 13. Therefore, as will be described later, the sacrificial anode material also serves as a brazing material. That is, the sacrificial anode material layer 13 contributes to the bonding of the brazing sheets 10 as a brazing material during bonding, and contributes to the anticorrosion effect of the brazing sheet 10 as a sacrificial anode material after bonding.
本開示に係るブレージングシート１０では、接合面１０ａに隣接して非接合隣接面１０ｂが設定されている。それゆえ、非接合隣接面１０ｂも接合面１０ａと同様に犠牲陽極材層１３である。 In the brazing sheet 10 according to the present disclosure, a non-bonded adjacent surface 10b is set adjacent to the bonded surface 10a. Therefore, the non-bonded adjacent surface 10b is also the sacrificial anode material layer 13 like the bonded surface 10a.
本開示に係るブレージングシート１０の接合構造２０においては、図１（Ｂ）においてブロック矢印Ｃ１およびＣ２に示す方向に腐食が進行する可能性がある。ブロック矢印Ｃ１の方向は、非接合隣接面１０ｂ（および接合面１０ａに隣接しない非接合面）から心材１１の方向に対して進行する腐食方向であり、ブロック矢印Ｃ２の方向は、フィレット２２を含む接合部２１において、接合面１０ａの方向に沿って進行する腐食方向である。 In the joint structure 20 of the brazing sheet 10 according to the present disclosure, corrosion may progress in the directions shown by block arrows C1 and C2 in FIG. 1(B). The direction of the block arrow C1 is the corrosion direction that progresses from the non-bonded adjacent surface 10b (and the non-bonded surface not adjacent to the bonded surface 10a) toward the core material 11, and the direction of the block arrow C2 includes the fillet 22. In the joint portion 21, the corrosion direction progresses along the direction of the joint surface 10a.
このうち、腐食方向Ｃ１に進行する腐食は、犠牲陽極材層１３による犠牲陽極作用によって抑制（回避または防止）されるが、腐食方向Ｃ２に進行する腐食は、フィレット２２に亜鉛が濃縮されることで、当該フィレット２２を含む接合部２１の電位が卑化され過ぎて進行するおそれがある。本開示に係るブレージングシート１０では、接合面１０ａとフィレット２２に対し、エポキシ系塗膜１４を表面に設置することにより、腐食方向Ｃ２の腐食を有効に抑制（回避または防止）することができる。 Of these, the corrosion that progresses in the corrosion direction C1 is suppressed (avoided or prevented) by the sacrificial anode action of the sacrificial anode material layer 13, but the corrosion that progresses in the corrosion direction C2 is caused by the concentration of zinc in the fillet 22. Therefore, there is a possibility that the potential of the joint portion 21 including the fillet 22 becomes too basic. In the brazing sheet 10 according to the present disclosure, by providing the epoxy coating film 14 on the surface of the joint surface 10a and the fillet 22, corrosion in the corrosion direction C2 can be effectively suppressed (avoided or prevented).
［ブレージングシートの接合構造および熱交換器］
本開示に係るブレージングシート１０は、前記の通り熱交換器の製造に特に好適に用いることができる。本開示に係るブレージングシート１０を熱交換器に適用した場合に形成される接合構造２０は、前述したように、図１（Ｂ）に例示するような構造であるが、より具体的には、図２（Ａ），（Ｂ）に示すような構造を有するプレートフィン積層型熱交換器、図３（Ａ），（Ｂ）に示すような構造を有するパラレルフローコンデンサ（ＰＦＣ）を挙げることができる。
[Brazing sheet joint structure and heat exchanger]
The brazing sheet 10 according to the present disclosure can be particularly suitably used for manufacturing a heat exchanger as described above. As described above, the joining structure 20 formed when the brazing sheet 10 according to the present disclosure is applied to a heat exchanger has a structure as illustrated in FIG. 1(B), but more specifically, Examples include a plate-fin stacked heat exchanger having a structure as shown in Figures 2(A) and (B), and a parallel flow condenser (PFC) having a structure as shown in Figures 3(A) and (B). can.
プレートフィン積層型熱交換器は、図示しないが、第１流体である冷媒が流れる流路を有するプレートフィン積層体において、各プレートフィン積層間に第２流体である空気を流して、これら第１流体および第２流体との間で熱交換を行うものである。この熱交換器が備えるプレートフィンは、第１流体が並行に流れる複数の第１流体流路を有する流路領域と、この流路領域における各第１流体流路に連通するヘッダー流路を有するヘッダー領域と、を備えている。 Although not shown, a plate fin stacked heat exchanger has a plate fin stack having a flow path through which a refrigerant, which is a first fluid, flows, and air, which is a second fluid, flows between each plate fin stack to Heat exchange is performed between the fluid and the second fluid. The plate fins included in this heat exchanger have a flow path area having a plurality of first fluid flow paths through which the first fluid flows in parallel, and a header flow path that communicates with each of the first fluid flow paths in this flow path area. It has a header area.
プレートフィン積層型熱交換器では、プレートフィン積層体の積層方向の両側に、当該プレートフィンと平面視が略同一形状のエンドプレートが設けられており、これら一対のエンドプレートとこれらの間に介在する複数のプレートフィンとは、積層された状態でろう付けにより接合されて一体化している。図２（Ａ）は、このプレートフィン積層体３０におけるヘッダー部分の概略構造を部分断面として示しており、図中最上部に位置するエンドプレート３１に対して複数のプレートフィン３２が積層されている。 In a plate fin stacked heat exchanger, end plates having substantially the same shape in plan view as the plate fins are provided on both sides of the plate fin stack in the stacking direction, and a pair of end plates is provided between the pair of end plates. The plurality of plate fins are stacked and joined by brazing to form an integral unit. FIG. 2A shows a schematic structure of the header portion of this plate-fin stack 30 as a partial cross-section, and a plurality of plate fins 32 are stacked on an end plate 31 located at the top in the figure. .
エンドプレート３１およびプレートフィン３２には、それぞれ開口部が設けられており、これらプレートが積層されてプレートフィン積層体３０を形成することにより、ヘッダー開口３３が形成される。図２（Ａ）に示す構成では、ヘッダー開口３３の外側から図中ブロック矢印で示す方向に第１流体である冷媒が流入し、さらにプレートフィン３２の間に冷媒が流入する。各プレートフィン３２には、前記の通り、第１流体流路が設けられているので、プレートフィン３２の間に流入した冷媒は、第１流体流路を流れる。また、第２流体である空気は、プレートフィン３２の間に形成される空間を、冷媒の流れる方向（第１流体流路の方向）に交差するように流れる。これにより、空気が冷媒により冷却される。 End plates 31 and plate fins 32 are each provided with openings, and header openings 33 are formed by stacking these plates to form plate-fin stack 30. In the configuration shown in FIG. 2A, the refrigerant, which is the first fluid, flows from the outside of the header opening 33 in the direction shown by the block arrow in the figure, and further the refrigerant flows between the plate fins 32. As described above, each plate fin 32 is provided with the first fluid flow path, so the refrigerant that has flowed between the plate fins 32 flows through the first fluid flow path. Moreover, the air, which is the second fluid, flows through the space formed between the plate fins 32 so as to intersect with the direction in which the refrigerant flows (the direction of the first fluid flow path). Thereby, the air is cooled by the refrigerant.
図２（Ｂ）は、図２（Ａ）に示すプレートフィン積層体３０の部分拡大図であり、本開示に係るブレージングシート１０の接合構造２０の一例を模式的に示す。図２（Ａ），（Ｂ）に示す例では、プレートフィン３２が本開示に係るブレージングシート１０であり、本開示に係る接合構造２０は、ヘッダー開口３３側に位置する接合部２１である。図２（Ｂ）では、ブレージングシート１０であるプレートフィン３２について、犠牲陽極材層１３をハッチングで強調して図示するとともに、フィレット２２もハッチングで強調して図示している。 FIG. 2(B) is a partially enlarged view of the plate-fin laminate 30 shown in FIG. 2(A), and schematically shows an example of the joining structure 20 of the brazing sheet 10 according to the present disclosure. In the example shown in FIGS. 2A and 2B, the plate fin 32 is the brazing sheet 10 according to the present disclosure, and the joint structure 20 according to the present disclosure is the joint portion 21 located on the header opening 33 side. In FIG. 2B, the sacrificial anode material layer 13 of the plate fin 32, which is the brazing sheet 10, is highlighted with hatching, and the fillet 22 is also highlighted with hatching.
ヘッダー開口３３側の接合部２１では、プレートフィン３２の接合面１０ａ同士が接合されており、この接合面１０ａに隣接する非接合隣接面１０ｂの間にフィレット２２が形成されている。本開示では、接合面１０ａおよびフィレット２２の表面にエポキシ系塗膜１４を設置している。これにより接合部２１の優先腐食が良好に抑制（回避または防止）されるので、プレートフィン積層型熱交換器の耐食寿命を向上することができる。 At the joint portion 21 on the side of the header opening 33, the joining surfaces 10a of the plate fins 32 are joined, and a fillet 22 is formed between the non-joining adjacent surfaces 10b adjacent to the joining surfaces 10a. In the present disclosure, an epoxy coating film 14 is provided on the surface of the joint surface 10a and the fillet 22. This effectively suppresses (avoids or prevents) preferential corrosion of the joint portion 21, thereby improving the corrosion-resistant life of the plate-fin stacked heat exchanger.
このようなプレートフィン積層型熱交換器の具体的な構成例としては、例えば、特開２０１７－１８０８５６号公報、特開２０１８－０６６５３１号公報、特開２０１８－０６６５３２号公報、特開２０１８－０６６５３３号公報、特開２０１８－０６６５３４号公報、特開２０１８－０６６５３５号公報、特開２０１８－０６６５３６号公報等に記載されており、これら公開公報の記載内容は、本明細書で参照することにより本明細書の記載の一部とする。 Specific configuration examples of such a plate-fin stacked heat exchanger include, for example, JP 2017-180856, JP 2018-066531, JP 2018-066532, and JP 2018-066533. No. 2018-066534, 2018-066535, 2018-066536, etc., and the contents of these publications are incorporated herein by reference. It shall be part of the description of the specification.
パラレルフローコンデンサ（ＰＦＣ）は、カーエアコン（自動車用空気調和装置）用に広く用いられる熱交換器であり、一対のヘッダー管の間に複数の扁平管が配置され、これら扁平管の間に放熱用のコルゲートフィンが配置されている。これらヘッダー管、扁平管、コルゲートフィン等がろう付けにより接合されている。図３（Ａ）は、このＰＦＣ４０におけるヘッダー管４１と扁平管４２との連結部分の概略構造を部分断面として示している。扁平管４２の間にはコルゲートフィン４３が設けられ、これらもろう付けにより接合されているが、本開示に係る接合構造２０は、図３（Ｂ）に拡大図示するように、ヘッダー管４１と扁平管４２との連結部分である。 Parallel flow condenser (PFC) is a heat exchanger widely used for car air conditioners (automotive air conditioners). Multiple flat tubes are placed between a pair of header tubes, and heat is dissipated between these flat tubes. A corrugated fin is placed for the purpose. These header tubes, flat tubes, corrugated fins, etc. are joined by brazing. FIG. 3(A) shows, as a partial cross-section, the schematic structure of the connecting portion between the header tube 41 and the flat tube 42 in this PFC 40. Corrugated fins 43 are provided between the flat tubes 42 and these are also joined by brazing, but the joining structure 20 according to the present disclosure has a header tube 41 and This is a connecting portion with the flat tube 42.
図３（Ｂ）に示す例では、ヘッダー管４１および扁平管４２がいずれもブレージングシート１０であり、ヘッダー管４１および扁平管４２については、犠牲陽極材層１３をハッチングで強調して図示している。また、フィレット２２もハッチングで強調して図示している。扁平管４２の犠牲陽極材層１３は平坦であるため、接合面１０ａと非接合隣接面１０ｂとは連続した単一面（犠牲陽極材層１３の面）において異なる領域として設定される。したがって、扁平管４２は、ブレージングシート１０としては、曲げ部を有さないような平坦な形状のものである。 In the example shown in FIG. 3(B), both the header tube 41 and the flat tube 42 are the brazing sheet 10, and the sacrificial anode material layer 13 of the header tube 41 and the flat tube 42 is highlighted with hatching. There is. Furthermore, the fillet 22 is also highlighted with hatching. Since the sacrificial anode material layer 13 of the flat tube 42 is flat, the bonding surface 10a and the non-bonding adjacent surface 10b are set as different regions on a single continuous surface (the surface of the sacrificial anode material layer 13). Therefore, the flat tube 42 as the brazing sheet 10 has a flat shape without a bent portion.
ヘッダー管４１は、扁平管４２を貫通挿入するための開口部を有しており、この開口部に接合面１０ａおよび非接合隣接面１０ｂが設けられている。図３（Ｂ）では、ヘッダー管４１の接合面１０ａは、扁平管４２の接合面１０ａ（外面）と平行になるような面として図示しているが、これに限定されず、扁平管４２の外面に平行にならない面であってもよい。ヘッダー管４１の開口部は、ブレージングシート１０としては、１段階の曲げ部を有する形状のものである。 The header tube 41 has an opening through which the flat tube 42 is inserted, and this opening is provided with a bonding surface 10a and a non-bonding adjacent surface 10b. In FIG. 3B, the joint surface 10a of the header tube 41 is illustrated as a surface parallel to the joint surface 10a (outer surface) of the flat tube 42, but the present invention is not limited to this. The surface may not be parallel to the outer surface. The opening of the header pipe 41 has a shape that has a one-step bending part for the brazing sheet 10.
図３（Ｂ）に示す接合構造２０では、ヘッダー管４１の接合面１０ａに隣接する非接合隣接面１０ｂと、扁平管４２の接合面１０ａに隣接する非接合隣接面１０ｂとの間に、フィレット２２が形成されている。本開示では、フィレット２２の表面にエポキシ系塗膜１４を設置している。これにより接合部２１の優先腐食が良好に抑制（回避または防止）されるので、ＰＦＣの耐食寿命を向上することができる。 In the joint structure 20 shown in FIG. 3(B), a fillet is provided between the non-joint adjacent surface 10b adjacent to the joint surface 10a of the header pipe 41 and the non-joint adjacent surface 10b adjacent to the joint surface 10a of the flat tube 42. 22 is formed. In the present disclosure, an epoxy coating film 14 is provided on the surface of the fillet 22. This effectively suppresses (avoids or prevents) preferential corrosion of the joint portion 21, thereby improving the corrosion resistance life of the PFC.
このようなブレージングシート１０の接合構造２０の製造方法は特に限定されず、公知のろう付け方法等を好適に用いることができる。例えば、ブレージングシート１０の接合面１０ａに対して公知のフラックスを塗布し、その後、窒素雰囲気炉において例えば６００℃程度の温度で加熱する方法が挙げられる。 The method for manufacturing the joining structure 20 of the brazing sheet 10 is not particularly limited, and a known brazing method or the like can be suitably used. For example, a method may be used in which a known flux is applied to the bonding surface 10a of the brazing sheet 10, and then heated at a temperature of about 600° C. in a nitrogen atmosphere furnace.
［熱交換器の設置形態］
前述したプレートフィン積層型熱交換器またはＰＦＣを空気調和装置に設置する形態について、一例を図４に示す。箱体５６内に熱交換器５１及び送風ファン５３を設置し、熱交換器５１の一部には前述したエポキシ系塗膜設置部５２が存在する。この部分は、熱交換器５１のヘッダー部に相当する。また、熱交換器５１から運転時に発生した結露水は、排水受け５５によって受けられ、箱体５６外に排出される。前述した第２流体である空気の風路は図中のブロック矢印で示しており、送風ファン５３によって吸い込まれた流体は、エアフィルター５４を通り、熱交換器５１によって熱交換され、箱体５６外へ排出される。このとき、エポキシ系塗膜設置部５２は風路の一部を構成するが、排水受け５５によって風路が部分的に遮断されているため、その風量は熱交換器５１における塗膜の非設置部に対し小さくなっている。このように風路が相対的に遮断されている部分を便宜上、非通風部と呼ぶ。
[Heat exchanger installation form]
FIG. 4 shows an example of how the plate-fin stacked heat exchanger or PFC described above is installed in an air conditioner. A heat exchanger 51 and a blower fan 53 are installed in a box 56, and a part of the heat exchanger 51 has the above-mentioned epoxy coating film installation section 52. This part corresponds to the header part of the heat exchanger 51. Further, condensed water generated from the heat exchanger 51 during operation is received by a drainage receiver 55 and discharged to the outside of the box body 56. The air path of the air, which is the second fluid mentioned above, is shown by the block arrow in the figure, and the fluid sucked in by the blower fan 53 passes through the air filter 54, is heat exchanged by the heat exchanger 51, and is transferred to the box body 56. Expelled outside. At this time, the epoxy coating film installation part 52 constitutes a part of the air passage, but since the air passage is partially blocked by the drainage receiver 55, the air volume is the same as that in the heat exchanger 51 when no coating film is installed. It is smaller than the other parts. For convenience, the portion where the air passage is relatively blocked is called a non-ventilation portion.
このような構造において、エポキシ系塗膜設置部５２に着眼すると、箱体５６外からの紫外線は箱体５６によってさえぎられるため、実質的に紫外線の影響を受けない。そのため、塗膜の紫外線劣化が抑制され、寿命が長くなるという効果を奏する。また、塗膜の劣化に伴う剥離塗膜や腐食生成物は、エポキシ系塗膜設置部５２が非通風部であるがゆえに、熱交換器５１から発生する結露水によってほぼ確実に洗い流され、排水受け５５に受けられ結露水とともに箱体外に排出される。そのため、空気調和を目的とする環境中に前記生成物が飛散することなく熱交換を実施できる。 In such a structure, when focusing on the epoxy coating film installation part 52, since the ultraviolet rays from outside the box 56 are blocked by the box 56, it is not substantially affected by ultraviolet rays. Therefore, the deterioration of the coating film due to ultraviolet rays is suppressed, and the lifespan of the coating film is extended. In addition, since the epoxy coating film installation part 52 is a non-ventilated part, peeled paint films and corrosion products caused by deterioration of the paint film are almost certainly washed away by the condensed water generated from the heat exchanger 51, and are washed away by the drainage water. The condensed water is received by the receiver 55 and discharged to the outside of the box together with the condensed water. Therefore, heat exchange can be performed without the product being scattered into the environment intended for air conditioning.
［エポキシ系塗料］
本開示に係るエポキシ系塗料のエポキシ系とは、末端にエポキシ基を持ち、開環反応によって生成するもので、エピクロロヒドリンとフェノール、アルコール、アルデヒド、エステル、アミン、脂肪酸、イソシアネートのうちいずれか（複数でも可）との反応生成物のことを指す。分子量については特に規定しない。
[Epoxy paint]
The epoxy type of the epoxy paint according to the present disclosure has an epoxy group at the end and is produced by a ring-opening reaction, and is composed of epichlorohydrin and any one of phenol, alcohol, aldehyde, ester, amine, fatty acid, and isocyanate. Refers to the reaction product with (or more than one). There are no particular restrictions on the molecular weight.
図５に代表的なエポキシ系樹脂であるエピクロルヒドリン・ビスフェノールＡ型樹脂の分子構造を示す。エピクロルヒドリン・ビスフェノールＡ型樹脂は両端に反応性の高いエポキシ基をもち、剛直なビスフェノール核を骨格とし、可とう性の良いエーテル基でつながっており、また、密着性に寄与する水酸基が適度な間隔で配置される構造を持っている。そのため、多様な架橋反応を利用して、良好な密着性、耐薬品性、耐水性、電気絶縁性を示す。塗装の対象となるアルミニウムの下地は緻密かつ平滑な酸化被膜で覆われており、一般的にクロメート処理やブラスト処理などの下地処理無しで好適な密着性は得られないが、エポキシ系塗料であれば前記理由により下地処理無しで本熱交換器の防錆目的に耐えうる密着性を有する。そのため、塗装工程を簡略化できうる。 Figure 5 shows the molecular structure of epichlorohydrin bisphenol A type resin, which is a typical epoxy resin. Epichlorohydrin bisphenol A type resin has highly reactive epoxy groups at both ends, has a rigid bisphenol core as its backbone, and is connected by flexible ether groups. Also, the hydroxyl groups that contribute to adhesion are spaced at appropriate intervals. It has a structure that is arranged in Therefore, it exhibits good adhesion, chemical resistance, water resistance, and electrical insulation properties by utilizing various crosslinking reactions. The aluminum substrate to be painted is covered with a dense and smooth oxide film, and it is generally not possible to obtain suitable adhesion without surface treatment such as chromate treatment or blasting. For the reason mentioned above, it has adhesion that can withstand the rust prevention purpose of the present heat exchanger without any surface treatment. Therefore, the painting process can be simplified.
また、本エポキシ系塗料に対し、耐食性向上を目的に酸化亜鉛や亜鉛粉末等の純水もしくは塩水環境下でアルミニウムより電位が卑な金属粉末を含有することが望ましい。亜鉛以外でも鉛やインジウム等で代替可能であるが、環境保護やコスト抑制の観点から亜鉛及びその合金（例えば、アルミニウムと亜鉛の合金）が望ましい。添加量については特に規定しないが、犠牲陽極作用が十分に得られるよう設定する。粉末の粒子径についても特に規定しないが、塗料として均一に分散するよう数μｍ以下のオーダーにすることが望ましい。 Further, in order to improve corrosion resistance, the epoxy paint desirably contains a metal powder, such as zinc oxide or zinc powder, which has a lower potential than aluminum in a pure water or salt water environment. Other than zinc, lead, indium, etc. can be substituted, but from the viewpoint of environmental protection and cost reduction, zinc and its alloys (for example, alloys of aluminum and zinc) are preferable. The amount added is not particularly specified, but it is set so that a sufficient sacrificial anode effect can be obtained. There are no particular restrictions on the particle size of the powder, but it is preferably on the order of several μm or less so that it can be uniformly dispersed as a paint.
希釈溶剤としては、前記エポキシ系塗料成分との相溶性の高いものを選択する。代表的なものとして、エチルベンゼン、キシレン、トルエン、メチルエチルケトン等が挙げられるが、これらに限定されるものではない。希釈倍率によって塗料の粘度が変わり、その結果塗装後の塗膜の厚みが変化するため、所望の塗膜厚みとなるよう希釈溶剤の量を調整する。 As the diluting solvent, one is selected that has high compatibility with the epoxy paint components. Typical examples include ethylbenzene, xylene, toluene, methyl ethyl ketone, etc., but are not limited to these. The viscosity of the paint changes depending on the dilution ratio, and as a result, the thickness of the paint film after painting changes, so the amount of diluent solvent is adjusted to obtain the desired film thickness.
その他エポキシ系塗料の耐久性を向上させる成分、例えばエポキシ系塗料の欠点である脆弱な耐候性（耐紫外線）を補うため種々の耐候剤を添加しても良いが、本発明においては構造的な対策を実施するため添加せずとも良い。 Other ingredients that improve the durability of epoxy paints, for example, various weathering agents may be added to compensate for the weak weather resistance (resistance to ultraviolet rays), which is a drawback of epoxy paints, but in the present invention, structural It does not need to be added in order to implement countermeasures.
［塗膜の厚み］
塗膜が厚い場合、塗膜中の金属粒子の存在量が多いため犠牲陽極作用が長期間作用し、また塗膜中の酸素や水の透過を有効に抑制することにより周囲環境との遮断能力が向上するという利点があるが、熱交換器の運転等に伴う熱膨張により、塗膜内部およびアルミニウム材との密着面への応力負荷がかかり、容易に塗膜が剥離し、熱交換器の耐食寿命向上の効果を著しく損なう。またヘッダー部に、温度の異なる流体間の断熱を目的とした微小空間を設けている場合は、その空間を塗膜で埋めることにより熱交換器としての性能を著しく低下させる恐れがある。さらには、使用する塗料の量が増えることによるコスト増となる。
[Coating film thickness]
When the paint film is thick, the sacrificial anode effect works for a long time due to the large amount of metal particles in the paint film, and the ability to isolate it from the surrounding environment by effectively suppressing the permeation of oxygen and water through the paint film. However, due to the thermal expansion caused by the operation of the heat exchanger, stress is applied to the inside of the coating film and to the surfaces in close contact with the aluminum material, and the coating film easily peels off, causing damage to the heat exchanger. The effect of improving corrosion resistance life is significantly impaired. Furthermore, if the header section is provided with a small space for the purpose of insulating fluids of different temperatures, filling that space with a coating film may significantly reduce the performance as a heat exchanger. Furthermore, the cost increases due to an increase in the amount of paint used.
塗膜が薄い場合、前記欠点は解消されるものの、塗膜中の金属粒子の存在量が少ないため犠牲陽極作用が短期間しか作用せず、また塗膜中の酸素や水の透過を有効に抑制できず塗膜下腐食による剥離が起こり熱交換器の耐食寿命向上の効果が十分に得られない。 If the paint film is thin, the above-mentioned drawbacks will be resolved, but the sacrificial anode effect will only work for a short period of time because the amount of metal particles in the paint film is small, and oxygen and water permeation through the paint film will not be effective. If the corrosion cannot be suppressed, peeling occurs due to corrosion under the coating, and the effect of improving the corrosion resistance life of the heat exchanger cannot be sufficiently obtained.
後に説明するが、発明者らの検討の結果、塗膜厚み１０μｍ～５０μｍであれば、十分な環境遮断および犠牲陽極作用を発揮し、また早期の塗膜剥離を抑制でき、その結果、熱交換器の耐食性を有効に向上させることができることが明らかとなった。 As will be explained later, as a result of studies conducted by the inventors, a coating film thickness of 10 μm to 50 μm provides sufficient environmental protection and sacrificial anode action, and can suppress early peeling of the coating film, resulting in improved heat exchange. It has become clear that the corrosion resistance of vessels can be effectively improved.
なお、以下の実施例および比較例における耐食性試験、耐湿性試験および密着性試験は次に示すようにして行った。 In addition, the corrosion resistance test, moisture resistance test, and adhesion test in the following Examples and Comparative Examples were conducted as shown below.
［耐食性試験］
熱交換器の塗膜の耐食性は、ＡＳＴＭ Ｇ８５－Ａ３で規定されるＳＷＡＡＴ試験（Ｓｅａ Ｗａｔｅｒ Ａｃｉｄｉｆｉｅｄ Ｔｅｓｔ）に基づいて評価した。
[Corrosion resistance test]
The corrosion resistance of the heat exchanger coating was evaluated based on the SWAAT test (Sea Water Acidified Test) specified by ASTM G85-A3.
［耐湿性試験］
熱交換器の塗膜の耐湿性は、雰囲気温度４０℃、相対湿度９８％に設定した恒温恒湿層内にサンプルを保持し評価した。
[Moisture resistance test]
The moisture resistance of the coating film of the heat exchanger was evaluated by holding the sample in a constant temperature and humidity layer set at an ambient temperature of 40° C. and a relative humidity of 98%.
［密着性試験］
耐久試験後の塗膜の密着性は、ＪＩＳ Ｋ５４００で規定される１００マス碁盤目試験に基づいて評価した。
[Adhesion test]
The adhesion of the coating film after the durability test was evaluated based on a 100 square grid test specified in JIS K5400.
（比較例１）
比較例１に係る塗膜としては、ブレージングシートに亜鉛粉末を含有するエピクロルヒドリン・ビスフェノールＡ型塗膜を８０μｍの膜厚で設置した。
(Comparative example 1)
As a coating film according to Comparative Example 1, an epichlorohydrin bisphenol A type coating film containing zinc powder was installed on a brazing sheet with a film thickness of 80 μm.
当該塗膜に対し、前述した耐食性試験およびその後の密着性試験を実施した。その結果、図６（Ａ）の断面写真に示すように耐食性においてはブレージングシートへの腐食進行はほとんどなく亜鉛粉末による犠牲防食機能が認められたものの、密着性においては図７（Ａ）に示すように著しい塗膜の剥離が確認された。 The above-described corrosion resistance test and subsequent adhesion test were conducted on the coating film. As a result, as shown in the cross-sectional photograph in Figure 6 (A), in terms of corrosion resistance, there was almost no progress of corrosion to the brazing sheet, and the sacrificial corrosion protection function by the zinc powder was observed, but in terms of adhesion, as shown in Figure 7 (A). Significant peeling of the paint film was confirmed.
当該塗膜に対し、前述した耐湿性試験およびその後の密着性試験を実施した。その結果、図８（Ａ）に示すように著しい塗膜の剥離が確認された。 The coating film was subjected to the moisture resistance test described above and the subsequent adhesion test. As a result, significant peeling of the coating film was confirmed as shown in FIG. 8(A).
（比較例２）
比較例２に係る塗膜としては、ブレージングシートに亜鉛粉末を含有するエピクロルヒドリン・ビスフェノールＡ型塗膜を５μｍの膜厚で設置した。
(Comparative example 2)
As a coating film according to Comparative Example 2, an epichlorohydrin bisphenol A type coating film containing zinc powder was installed on a brazing sheet with a film thickness of 5 μm.
当該塗膜に対し、前述した耐食性試験およびその後の密着性試験を実施した。その結果、図６（Ｂ）の断面写真に示すように耐食性においては塗膜下でのブレージングシートへの腐食進行が認められた。その後の密着性においては図７（Ｂ）に示すように著しい剥離が確認された。 The above-described corrosion resistance test and subsequent adhesion test were conducted on the coating film. As a result, as shown in the cross-sectional photograph of FIG. 6(B), in terms of corrosion resistance, progress of corrosion to the brazing sheet under the coating film was observed. As for the adhesion after that, significant peeling was confirmed as shown in FIG. 7(B).
当該塗膜に対し、前述した耐湿性試験およびその後の密着性試験を実施した。その結果、図８（Ｂ）に示すように塗膜の剥離は確認されなかった。 The coating film was subjected to the moisture resistance test described above and the subsequent adhesion test. As a result, as shown in FIG. 8(B), no peeling of the coating film was observed.
（実施例１）
実施例１に係る塗膜としては、ブレージングシートに亜鉛粉末を含有するエピクロルヒドリン・ビスフェノールＡ型塗膜を４０μｍの膜厚で設置した。
(Example 1)
As the coating film according to Example 1, an epichlorohydrin bisphenol A type coating film containing zinc powder was installed on a brazing sheet with a film thickness of 40 μm.
当該塗膜に対し、前述した耐食性試験およびその後の密着性試験を実施した。その結果、図６（Ｃ）の断面写真に示すように耐食性においてはブレージングシートへの腐食進行は認められず亜鉛粉末による犠牲防食機能が認められた。その後の密着性においては図７（Ｃ）に示すように剥離は確認されなかった。 The above-described corrosion resistance test and subsequent adhesion test were conducted on the coating film. As a result, as shown in the cross-sectional photograph of FIG. 6(C), no progress of corrosion to the brazing sheet was observed in terms of corrosion resistance, and the sacrificial anticorrosion function of the zinc powder was observed. As for the subsequent adhesion, no peeling was observed as shown in FIG. 7(C).
当該塗膜に対し、前述した耐湿性試験およびその後の密着性試験を実施した。その結果、図８（Ｃ）に示すように塗膜の剥離は確認されなかった。 The coating film was subjected to the moisture resistance test described above and the subsequent adhesion test. As a result, as shown in FIG. 8(C), no peeling of the coating film was observed.
（実施例２）
実施例２に係る塗膜としては、ブレージングシートで構成された熱交換器のフィレット部に亜鉛粉末を含有するエピクロルヒドリン・ビスフェノールＡ型塗膜を４０μｍの膜厚で設置した。
(Example 2)
As the coating film according to Example 2, an epichlorohydrin bisphenol A type coating film containing zinc powder was installed at a film thickness of 40 μm on the fillet portion of a heat exchanger made of a brazing sheet.
当該塗膜に対し、前述した耐食性試験を実施した。その結果、図６（Ｄ）の断面写真に示すように耐食性においてはヘッダー部の優先腐食が有効に抑制されていることが認められた。 The above-mentioned corrosion resistance test was conducted on the coating film. As a result, as shown in the cross-sectional photograph of FIG. 6(D), it was found that preferential corrosion of the header portion was effectively suppressed in terms of corrosion resistance.
（実施例および比較例の対比）
図６および図７の（Ａ）、（Ｂ）、（Ｃ）の対比で明らかなように、塗膜厚みが十分厚ければ（実施例および比較例１）犠牲防食が有効に機能し塗膜下での腐食は発生しないが、塗膜厚みが十分薄ければ（比較例２）、水や酸素の遮断が不十分なため塗膜下での腐食が発生する。
(Comparison of Examples and Comparative Examples)
As is clear from the comparison between (A), (B), and (C) in Figures 6 and 7, if the coating film is sufficiently thick (Example and Comparative Example 1), the sacrificial corrosion protection will function effectively. Corrosion does not occur beneath the coating, but if the coating film is sufficiently thin (Comparative Example 2), corrosion occurs beneath the coating because water and oxygen are not blocked sufficiently.
また、図８の（Ａ）、（Ｂ）、（Ｃ）対比で明らかなように、塗膜厚みが十分厚ければ（比較例１）塗膜内部および下地との界面での応力発生により塗膜は容易に剥離するが、塗膜厚みが十分薄ければ（実施例および比較例２）、塗膜の密着性が担保される。 In addition, as is clear from the comparison between (A), (B), and (C) in Figure 8, if the coating film is sufficiently thick (Comparative Example 1), stress will be generated inside the coating film and at the interface with the base. Although the film peels off easily, if the coating film thickness is sufficiently thin (Example and Comparative Example 2), the adhesion of the coating film is ensured.
また、図９に示すように、横軸を塗膜厚みとし、縦軸を前記１００マス碁盤目試験における塗膜残数を密着性と定義し実施例１および比較例の密着性をプロットすると、１０～５０μｍが最も好適に耐食性を確保できる条件であることがわかる。 Further, as shown in FIG. 9, when the horizontal axis is the coating film thickness and the vertical axis is the number of remaining coating films in the 100-square grid test, which is defined as adhesion, the adhesion of Example 1 and Comparative Example is plotted. It can be seen that 10 to 50 μm is the most suitable condition for ensuring corrosion resistance.
なお、本発明は前記実施の形態の記載に限定されるものではなく、特許請求の範囲に示した範囲内で種々の変更が可能であり、異なる実施の形態や複数の変形例にそれぞれ開示された技術的手段を適宜組み合わせて得られる実施の形態についても本発明の技術的範囲に含まれる。 It should be noted that the present invention is not limited to the description of the embodiments described above, and can be modified in various ways within the scope of the claims, and may be disclosed in different embodiments or multiple modified examples. Embodiments obtained by appropriately combining the above technical means are also included in the technical scope of the present invention.
本発明は、空気調和装置用アルミニウム熱交換器の分野に広く好適に用いることができる。 INDUSTRIAL APPLICABILITY The present invention can be widely and suitably used in the field of aluminum heat exchangers for air conditioners.
１０：ブレージングシート
１０ａ：接合面
１０ｂ：非接合隣接面
１１：心材
１２：ろう材層
１３：犠牲陽極材層
１４：エポキシ系塗膜
２０：ブレージングシートの接合構造
２１：接合部
２２：フィレット
３０：プレートフィン積層体
３１：エンドプレート
３２：プレートフィン
３３：ヘッダー開口
３４：プレートフィン積層体
３５：プレートフィン
４０：パラレルフローコンデンサ（ＰＦＣ）
４１：ヘッダー管
４２：扁平管
４３：コルゲートフィン
５１：熱交換器
５２：エポキシ系塗膜設置部
５３：送風ファン
５４：エアフィルター
５５：排水受け
10: Brazing sheet 10a: Bonding surface 10b: Non-bonding adjacent surface 11: Core material 12: Brazing material layer 13: Sacrificial anode material layer 14: Epoxy coating film 20: Bonding structure of brazing sheet 21: Bonding portion 22: Fillet 30: Plate fin laminate 31: End plate 32: Plate fin 33: Header opening 34: Plate fin laminate 35: Plate fin 40: Parallel flow capacitor (PFC)
41: Header pipe 42: Flat pipe 43: Corrugated fin 51: Heat exchanger 52: Epoxy coating installation part 53: Blower fan 54: Air filter 55: Drainage receiver
Claims (8)
を有し、該塗膜の厚さが１０～５０μｍの範囲内であり、該塗膜に紫外線が直接照射しないよう箱体内に設置され、前記エポキシ系塗膜に、結露水環境や塩水環境においてアルミニウムより電位が卑な金属粉末を含有し、前記熱交換器がアルミ管またはブレージングシートで構成されており、前記アルミ管はアルミニウム合金製であり、前記アルミ管の表面に、亜鉛（Ｚｎ）または亜鉛（Ｚｎ）およびシリコン（Ｓｉ）を含有するアルミニウム合金の犠牲陽極材からなる犠牲陽極材層を備え、前記ブレージングシートはアルミニウム合金製の心材と、該心材の片面もしくは両方の面に被覆され、亜鉛（Ｚｎ）または亜鉛（Ｚｎ）およびシリコン（Ｓｉ）を含有するアルミニウム合金の犠牲陽極材からなる犠牲陽極材層とを備え、前記ブレージングシート同士の接合部が冷媒流路の一部を形成したことを特徴とする熱交換器。 The heat exchanger is made of aluminum and has a layer of epoxy coating on a part of the surface of the heat exchanger, the thickness of the coating is within the range of 10 to 50 μm, and the coating has a thickness of 10 to 50 μm. The heat exchanger is installed inside a box so as not to be directly irradiated with ultraviolet rays, the epoxy coating film contains metal powder that has a lower potential than aluminum in a condensed water environment or a salt water environment , and the heat exchanger is composed of an aluminum tube or a brazing sheet. The aluminum tube is made of an aluminum alloy, and a sacrificial anode material layer made of zinc (Zn) or an aluminum alloy sacrificial anode material containing zinc (Zn) and silicon (Si) is provided on the surface of the aluminum tube. The brazing sheet includes a core material made of an aluminum alloy, and a sacrificial anode material made of an aluminum alloy containing zinc (Zn) or zinc (Zn) and silicon (Si), which is coated on one or both sides of the core material. 1. A heat exchanger comprising: a sacrificial anode material layer, wherein a joint between the brazing sheets forms a part of a refrigerant flow path .
記載の熱交換器。 The heat exchanger according to any one of claims 1 to 2, wherein the coating film is installed in a non-ventilated area.
ことを特徴とする請求項１から３のいずれか１項に記載の熱交換器。 The heat exchanger according to any one of claims 1 to 3, wherein products associated with deterioration of the coating film are removed by condensed water generated during operation of the heat exchanger.
金製の心材と、当該心材の片面もしくは両方の面に被覆され、亜鉛（Ｚｎ）およびシリコン（Ｓｉ）を含有するアルミニウム合金の犠牲陽極材からなる犠牲陽極材層とを備えるこ とを特徴とする請求項１から４のいずれか１項に記載の熱交換器。 The heat exchanger is composed of a brazing sheet, and the brazing sheet has a core made of an aluminum alloy, and one or both sides of the core is coated with a brazing sheet made of an aluminum alloy containing zinc (Zn) and silicon (Si). The heat exchanger according to any one of claims 1 to 4, further comprising a sacrificial anode material layer made of a sacrificial anode material.
交換器から生ずる結露水を受ける排水受けを備え、前記排水受けの鉛直直上に前記塗膜
を設けた空気調和装置。 An air conditioner comprising the heat exchanger according to any one of claims 1 to 7 , comprising a drainage receiver for receiving condensed water generated from the heat exchanger, and the coating is provided vertically above the drainage receiver. film
Air conditioner equipped with.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019188327A JP7442033B2 (en) | 2019-10-15 | 2019-10-15 | Heat exchanger and air conditioner equipped with the same |
| PCT/JP2020/038072 WO2021075335A1 (en) | 2019-10-15 | 2020-10-08 | Heat exchanger and air conditioning device provided with same |
| CN202080015171.5A CN113454416A (en) | 2019-10-15 | 2020-10-08 | Heat exchanger and air conditioning device with same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019188327A JP7442033B2 (en) | 2019-10-15 | 2019-10-15 | Heat exchanger and air conditioner equipped with the same |
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| Publication Number | Publication Date |
|---|---|
| JP2021063612A JP2021063612A (en) | 2021-04-22 |
| JP7442033B2 true JP7442033B2 (en) | 2024-03-04 |
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| JP2019188327A Active JP7442033B2 (en) | 2019-10-15 | 2019-10-15 | Heat exchanger and air conditioner equipped with the same |
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| JP (1) | JP7442033B2 (en) |
| CN (1) | CN113454416A (en) |
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- 2020-10-08 WO PCT/JP2020/038072 patent/WO2021075335A1/en active Application Filing
- 2020-10-08 CN CN202080015171.5A patent/CN113454416A/en active Pending
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| JP2005147588A (en) | 2003-11-18 | 2005-06-09 | Denso Corp | Heat exchanger and manufacturing method therefor |
| JP2006125659A (en) | 2004-10-26 | 2006-05-18 | Matsushita Electric Ind Co Ltd | Fin and tube type heat exchanger |
| JP2008014571A (en) | 2006-07-06 | 2008-01-24 | Sumitomo Light Metal Ind Ltd | Heat exchanger for refrigerator and its manufacturing method |
| US20140033534A1 (en) | 2011-04-25 | 2014-02-06 | Douglas C. Wintersteen | Method of making a heat exchanger with an enhance material system |
| JP2014208905A (en) | 2013-03-26 | 2014-11-06 | 株式会社神戸製鋼所 | Aluminum alloy blazing sheet |
| JP2015078789A (en) | 2013-10-16 | 2015-04-23 | 三菱電機株式会社 | Heat exchanger and air conditioning device including heat exchanger |
| JP2015224330A (en) | 2014-05-29 | 2015-12-14 | 日本電化工機株式会社 | Corrosion protection method for mechanical facility and anti-corrosive mechanical facility |
| JP6407466B1 (en) | 2018-04-19 | 2018-10-17 | 株式会社 エコファクトリー | Outside air conditioner and ventilation system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113454416A (en) | 2021-09-28 |
| JP2021063612A (en) | 2021-04-22 |
| WO2021075335A1 (en) | 2021-04-22 |
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