WO2022085105A1 - Échangeur de chaleur et procédé de fabrication d'échangeur de chaleur - Google Patents

Échangeur de chaleur et procédé de fabrication d'échangeur de chaleur Download PDF

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Publication number
WO2022085105A1
WO2022085105A1 PCT/JP2020/039526 JP2020039526W WO2022085105A1 WO 2022085105 A1 WO2022085105 A1 WO 2022085105A1 JP 2020039526 W JP2020039526 W JP 2020039526W WO 2022085105 A1 WO2022085105 A1 WO 2022085105A1
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WIPO (PCT)
Prior art keywords
fins
heat exchanger
corrosion
fin
resistant layer
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.)
Ceased
Application number
PCT/JP2020/039526
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English (en)
Japanese (ja)
Inventor
綾 河島
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP2022556286A priority Critical patent/JP7387021B2/ja
Priority to CN202080106003.7A priority patent/CN116235016A/zh
Priority to PCT/JP2020/039526 priority patent/WO2022085105A1/fr
Publication of WO2022085105A1 publication Critical patent/WO2022085105A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/24—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely
    • F28F1/32—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely the means having portions engaging further tubular elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • 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

Definitions

  • the present disclosure relates to a heat exchanger and a method for manufacturing the heat exchanger, and more specifically, to a heat exchanger having fins having a precoated film on the surface.
  • Some heat exchangers of conventional air conditioners consist of fins and heat transfer tubes.
  • the fin has a rectangular plate-like shape. Fins are manufactured by punching plate-shaped aluminum strips.
  • An aluminum strip is an aluminum plate or an aluminum alloy plate. The aluminum strip means a material in a state before processing, and various products are manufactured by processing the aluminum strip.
  • the surface of the aluminum strip for manufacturing the fins is previously coated with either a hydrophilic film, a corrosion resistant film, or both as a precoat film.
  • the hydrophilic film is provided to improve the heat exchange performance of the fins and prevent dew splash defects.
  • the dew splash problem is a water leak in which the surface of the fin becomes water repellent and the dew condensation water is not collected and discharged by the drain pan and is ejected from the indoor unit.
  • the corrosion resistant film is provided to improve the corrosion resistance of the fins.
  • Patent Document 1 proposes a method of immersing a heat exchanger in an aqueous solution of a resin paint to spread a corrosion-resistant film to the details of the heat exchanger.
  • Patent Document 1 by this method, the entire area including the cut surface portion of the fin where the aluminum is exposed is covered with a corrosion-resistant resin to improve the long-term corrosion resistance of the heat exchanger.
  • the present disclosure has been made to solve the above-mentioned problems, and by ensuring the long-term corrosion resistance of the heat exchanger while maintaining the hydrophilicity of the fin surface, the heat exchange performance is improved. It is an object of the present invention to provide a heat exchanger and a method for manufacturing a heat exchanger, which can achieve both prevention of defects such as dew splashing.
  • the heat exchanger includes a plurality of fins arranged at intervals in the first direction, and the plurality of fins are spaced apart from each other in a second direction that penetrates the plurality of fins and intersects the first direction.
  • a plate-shaped aluminum strip base material having a plurality of arranged heat transfer tubes, each of which has a main surface and a side surface forming a periphery of the main surface, and the aluminum strip base material of the aluminum strip base material.
  • a hydrophilic layer provided on the main surface, a first corrosion-resistant layer provided between the main surface and the hydrophilic layer of the aluminum strip base material, and a second provided on the side surface of the aluminum strip base material. It has a corrosion resistant layer.
  • the method for manufacturing a heat exchanger includes a step of cutting a plate-shaped aluminum strip provided with a corrosion-resistant layer and a hydrophilic layer on the surface to form a plurality of rectangular plate-shaped fins of the same shape, as described above.
  • the heat exchange performance is improved and the heat exchange performance is improved by ensuring the corrosion resistance of the heat exchanger for a long period of time while maintaining the hydrophilicity of the fin surface. It is possible to achieve both prevention of problems such as flying.
  • FIG. 3 is a cross-sectional view taken along the line AA of FIG.
  • FIG. 3 is a cross-sectional view taken along the line BB of FIG.
  • FIG. 3 is a flowchart which shows the flow of process of the manufacturing method of the heat exchanger which concerns on Embodiment 1.
  • FIG. 1 It is a schematic perspective view which shows the process of coating the corrosion-resistant layer 18 in the manufacturing method of the heat exchanger which concerns on Embodiment 1.
  • FIG. It is a schematic perspective view which shows the modification of the process shown in FIG. It is a reference figure which shows typically the fin 8 when the hydrophilic layer 20 is not applied. It is a figure which shows an example of the step of applying the ultraviolet curable resin to both ends 15bb of the protrusion 15b in the manufacturing method of the heat exchanger which concerns on Embodiment 1.
  • FIG. 1 is a refrigerant circuit diagram showing the configuration of the refrigeration cycle device 100 according to the first embodiment.
  • the flow of the refrigerant during the cooling operation is indicated by a broken line arrow
  • the flow of the refrigerant during the heating operation is indicated by a solid line arrow.
  • the refrigerating cycle device 100 includes a compressor 1, an indoor heat exchanger 2, an outdoor heat exchanger 3, a throttle device 4, an indoor fan 5, an outdoor fan 6, a four-way valve 7, and a control unit 40. It is equipped with.
  • the compressor 1, the four-way valve 7, the indoor heat exchanger 2, the throttle device 4, and the outdoor heat exchanger 3 are connected by a refrigerant pipe 30, to form a refrigerant circuit.
  • the heat exchanger according to the first embodiment corresponds to at least one of the indoor heat exchanger 2 and the outdoor heat exchanger 3.
  • the compressor 1, the outdoor heat exchanger 3, the throttle device 4, the outdoor fan 6, and the four-way valve 7 are arranged in the outdoor unit.
  • the outdoor unit also called an outdoor unit, is installed outdoors. Further, the indoor heat exchanger 2 and the indoor fan 5 are arranged in the indoor unit.
  • the indoor unit also called an indoor unit, is installed in the room to be air-conditioned.
  • the compressor 1 sucks in the refrigerant flowing in the refrigerant pipe 30.
  • the compressor 1 compresses and discharges the sucked refrigerant.
  • the compressor 1 is, for example, an inverter compressor.
  • the operating frequency of the motor that drives the compressor 1 is arbitrarily changed by a drive circuit such as an inverter circuit to change the capacity of the compressor 1 to send out the refrigerant per unit time. You may do so.
  • the operation of the drive circuit is controlled by the control unit 40.
  • the refrigerant discharged from the compressor 1 flows into the outdoor heat exchanger 3 during the cooling operation and into the indoor heat exchanger 2 during the heating operation via the four-way valve 7.
  • the indoor heat exchanger 2 exchanges heat between the refrigerant flowing inside and the air in the room to be air-conditioned.
  • the indoor heat exchanger 2 functions as an evaporator during the cooling operation, and evaporates and vaporizes the refrigerant.
  • the indoor heat exchanger 2 functions as a condenser during the heating operation to condense and liquefy the refrigerant.
  • the indoor heat exchanger 2 is, for example, a fin-and-tube heat exchanger.
  • the outdoor heat exchanger 3 exchanges heat between the refrigerant flowing inside and the outdoor air.
  • the outdoor heat exchanger 3 functions as a condenser during the cooling operation to condense and liquefy the refrigerant.
  • the outdoor heat exchanger 3 functions as an evaporator during the heating operation to evaporate and vaporize the refrigerant.
  • the outdoor heat exchanger 3 is, for example, a fin-and-tube heat exchanger.
  • the throttle device 4 is a decompression device that decompresses and expands the refrigerant, and is composed of, for example, an electronic expansion valve.
  • the opening degree of the throttle device 4 is adjusted based on the control of the control unit 40.
  • the throttle device 4 is provided between the indoor heat exchanger 2 and the outdoor heat exchanger 3.
  • the indoor fan 5 has a fan motor and a wing portion.
  • the wing portion is rotationally driven by a fan motor.
  • the indoor fan 5 blows indoor air to the indoor heat exchanger 2.
  • the rotation speed of the indoor fan 5 is controlled by the control unit 40.
  • the outdoor fan 6 has a fan motor and a wing portion.
  • the wing portion is rotationally driven by a fan motor.
  • the outdoor fan 6 blows outside air to the outdoor heat exchanger 3.
  • the rotation speed of the outdoor fan 6 is controlled by the control unit 40.
  • the four-way valve 7 is configured to switch the state between the case of cooling operation and the case of heating operation.
  • the four-way valve 7 is a flow path switching device that switches the flow of the refrigerant between the cooling operation and the heating operation.
  • the four-way valve 7 In the case of cooling operation, the four-way valve 7 is in the state shown by the broken line, and the refrigerant discharged from the compressor 1 flows into the outdoor heat exchanger 3.
  • the four-way valve 7 is in a state shown by a solid line, and the refrigerant discharged from the compressor 1 flows into the indoor heat exchanger 2.
  • the switching of the four-way valve 7 is performed by the control of the control unit 40.
  • the high-temperature and high-pressure gas refrigerant (single-phase) discharged from the compressor 1 functions as an outdoor heat as a condenser via the four-way valve 7. It flows into the exchanger 3.
  • the outdoor heat exchanger 3 heat exchange is performed between the high-temperature and high-pressure gas refrigerant that has flowed in and the air supplied by the outdoor fan 6.
  • the high-temperature and high-pressure gas refrigerant condenses into a high-pressure liquid refrigerant (single-phase).
  • the high-pressure liquid refrigerant sent out from the outdoor heat exchanger 3 becomes a two-phase state refrigerant of a low-pressure gas refrigerant and a liquid refrigerant by the throttle device 4.
  • the two-phase refrigerant flows into the indoor heat exchanger 2 that functions as an evaporator.
  • heat exchange is performed between the flowing two-phase state refrigerant and the air supplied by the indoor fan 5.
  • the liquid refrigerant of the two-phase refrigerant evaporates to become a low-pressure gas refrigerant (single-phase). This heat exchange cools the room.
  • the low-pressure gas refrigerant sent out from the indoor heat exchanger 2 flows into the compressor 1 via the four-way valve 7.
  • the compressor 1 the low-pressure gas refrigerant is compressed to become a high-temperature and high-pressure gas refrigerant, and is discharged from the compressor 1 again.
  • this cycle is repeated.
  • the high-temperature and high-pressure gas refrigerant (single-phase) discharged from the compressor 1 functions as a condenser through the four-way valve 7. It flows into the exchanger 2.
  • the indoor heat exchanger 2 heat exchange is performed between the high-temperature and high-pressure gas refrigerant that has flowed in and the air supplied by the indoor fan 5.
  • the high-temperature and high-pressure gas refrigerant condenses into a high-pressure liquid refrigerant (single-phase). This heat exchange heats the room.
  • the high-pressure liquid refrigerant sent out from the indoor heat exchanger 2 becomes a two-phase state refrigerant of a low-pressure gas refrigerant and a liquid refrigerant by the throttle device 4.
  • the two-phase refrigerant flows into the outdoor heat exchanger 3 that functions as an evaporator.
  • heat exchange is performed between the flowing two-phase state refrigerant and the air supplied by the outdoor fan 6.
  • the liquid refrigerant of the two-phase refrigerant evaporates to become a low-pressure gas refrigerant (single-phase).
  • the low-pressure gas refrigerant sent out from the outdoor heat exchanger 3 flows into the compressor 1 via the four-way valve 7.
  • the compressor 1 the low-pressure gas refrigerant is compressed to become a high-temperature and high-pressure gas refrigerant, and is discharged from the compressor 1 again.
  • this cycle is repeated.
  • the configuration of the indoor heat exchanger 2 according to the first embodiment will be described with reference to FIGS. 2 to 6. Since the configuration of the outdoor heat exchanger 3 may be basically the same as the configuration of the indoor heat exchanger 2, the description thereof is omitted here.
  • FIG. 2 is a perspective view showing an example of the configuration of the indoor heat exchanger 2 according to the first embodiment.
  • the indoor heat exchanger 2 shown in FIG. 2 is a fin-and-tube type heat exchanger.
  • the indoor heat exchanger 2 has a plurality of fins 8 arranged at intervals in the Y direction (first direction) and a Z that penetrates the plurality of fins 8 and intersects the Y direction. It has a plurality of heat transfer tubes 9 arranged at intervals from each other in the direction (second direction).
  • the indoor heat exchanger 2 is composed of a plurality of fins 8, a fixing plate 32, a plurality of hairpin tubes 10, and a plurality of bends 11.
  • the plurality of hairpin tubes 10 and the plurality of bends 11 constitute a heat transfer tube 9.
  • the plurality of fins 8 are arranged in parallel at regular intervals in the Y direction. Therefore, the Y direction is also referred to as the stacking direction of the fins 8 or the plate thickness direction of the fins 8.
  • the fin 8 has a plate-like shape and has two main surfaces 51 (see FIG. 4) and four side surfaces.
  • the fin 8 extends in the longitudinal direction in the Z direction and extends in the lateral direction in the X direction (third direction).
  • the Z direction is, for example, a vertical direction.
  • the X direction and the Y direction are, for example, the horizontal direction.
  • the X and Y directions are orthogonal to each other. Further, the X direction and the Y direction are orthogonal to the Z direction, respectively.
  • the fixing plate 32 is arranged on the outside of the plurality of laminated fins 8. That is, the fixing plate 32 is arranged at one end of the laminated fins 8 in the stacking direction.
  • the fixing plate 32 has a plate-like shape.
  • the main surface of the fixing plate 32 is arranged so as to be parallel to the main surface 51 of the fin 8.
  • Each hairpin tube 10 has a U-shape. Therefore, each hairpin tube 10 has two linear portions 10a arranged in parallel (see FIG.
  • each hairpin tube 10 is arranged so as to penetrate the plurality of laminated fins 8 and the fixing plate 32. Therefore, the straight portion 10a of the hairpin tube 10 extends in the Y direction. Further, the end portion 10c of the hairpin tube 10, that is, the tip of the straight line portion 10a opposite to the curved portion 10b protrudes from the fixing plate 32 as shown in FIG. The bend 11 connects the end portions 10c of the hairpin tube 10 adjacent to each other. Further, as shown in FIG. 2, the refrigerant pipe 30 and the indoor heat exchanger 2 shown in FIG. 1 are connected to each other via the distributor 13 and the plurality of refrigerant pipes 12. The refrigerant pipe 12 is distributed by the distributor 13. The distributor 13 has a bottomed cylindrical shape. The inside of the distributor 13 is hollow.
  • FIG. 3 is a plan view showing an example of the configuration of the fins 8 of the indoor heat exchanger 2 according to the first embodiment.
  • FIG. 4 is a partial perspective view showing the fin 8 shown in FIG.
  • the fin 8 has an elongated rectangular flat plate shape. Therefore, the fin 8 has two main surfaces 51 and four side surfaces forming the periphery of the main surface 51.
  • each of the four sides will be referred to as an end portion 16a or 16b.
  • the end portion 16a is an end portion in the lateral direction, and is also referred to as an end portion on the long side.
  • the two ends 16a face each other and are arranged parallel to each other.
  • FIG. 3 is a plan view showing an example of the configuration of the fins 8 of the indoor heat exchanger 2 according to the first embodiment.
  • FIG. 4 is a partial perspective view showing the fin 8 shown in FIG.
  • the fin 8 has an elongated rectangular flat plate shape. Therefore, the fin 8 has two main surfaces 51 and four side surfaces forming the pe
  • the end portion 16b is an end portion in the longitudinal direction and is also referred to as an end portion on the short side.
  • the two ends 16b face each other and are arranged parallel to each other.
  • the ends 16a and 16b are provided with a corrosion resistant layer 18.
  • a precoat film 50 is provided on the two main surfaces 51 of the fins 8 over the entire surface.
  • the precoat film 50 has a two-layer structure including a hydrophilic layer and a corrosion resistant layer. The precoat film 50 will be described later.
  • the fin 8 is manufactured by punching a plate-shaped aluminum strip. Therefore, the ends 16a and 16b constituting the side surface of the fin 8 include a cut surface formed when the aluminum strip is cut. Therefore, the ends 16a and 16b do not have the precoat film 50, and the aluminum strip base material 17 (see FIGS. 5 and 6) is exposed. Therefore, in the first embodiment, the corrosion resistant layer 18 is provided on the end portions 16a and 16b in order to prevent corrosion from starting from the end portions 16a and 16b. The corrosion resistant layer 18 is arranged so as to cover the ends 16a and 16b of the fin 8. The corrosion-resistant layer 18 covers only the ends 16a and 16b of the fin 8 so as not to be applied to the precoat film 50 on the main surface 51 of the fin 8.
  • the fin 8 is formed with a hairpin tube insertion hole 14.
  • the hairpin tube insertion hole 14 is a through hole that penetrates the plate thickness of the fin 8.
  • the hairpin tube insertion holes 14 are arranged in a single row or a plurality of rows at regular intervals along the longitudinal direction of the fins 8. 3 and 4 show a case where the hairpin tube insertion holes 14 are arranged in a single row for the sake of simplification of the figure, but as shown in FIG. 2, a plurality of indoor heat exchangers 2 are arranged in a row. In the case of, the hairpin tube insertion holes 14 are arranged in a plurality of rows. As shown in FIG.
  • a trumpet-shaped fin collar 14a is formed on the outer periphery of the hairpin tube insertion hole 14.
  • the fin collar 14a is formed, for example, by cutting and raising. Specifically, the fin collar 14a is formed by hollowing out the main surface of the fin 8 in a circular shape and raising the circumferential portion. A straight portion 10a (see FIG. 10) of the hairpin tube 10 is inserted into the hairpin tube insertion hole 14. Therefore, the longitudinal direction of the fin 8 and the axial direction of the straight line portion 10a of the hairpin tube 10 intersect vertically or substantially vertically.
  • a louver 15 may be formed on the surface of the fin 8 as a heat transfer promoting portion.
  • the louvers 15 are arranged side by side in a plurality of rows, for example, between adjacent hairpin tube insertion holes 14.
  • the louver 15 is formed, for example, by cutting and raising. Specifically, first, two slits 15a are formed parallel to the main surface 51 of the fin 8. The slit 15a penetrates the plate thickness of the fin 8. Next, the rectangular portion 15b between the two slits 15a is bent so as to protrude from the surface of the fin 8. By these steps, the louver 15 is formed.
  • the raised portion 15b will be referred to as a protruding portion 15b of the louver 15.
  • louver 15 When the louver 15 is provided on the fin 8, a part of the air flowing along the main surface 51 of the fin 8 passes through the louver 15 part. That is, air flows from the slit 15a of the louver 15 below the protrusion 15b. Therefore, heat transfer of the indoor heat exchanger 2 is promoted.
  • FIG. 5 is a sectional view taken along the line AA of FIG.
  • FIG. 6 is a cross-sectional view taken along the line BB of FIG.
  • the corrosion resistant layer 19 is provided on the upper surface and the lower surface of the rectangular plate-shaped aluminum strip base material 17.
  • a hydrophilic layer 20 is provided on the upper surface of the upper corrosion resistant layer 19.
  • a hydrophilic layer 20 is provided on the lower surface of the lower corrosion resistant layer 19. Therefore, as shown in FIGS. 5 and 6, the fin 8 is laminated with the hydrophilic layer 20, the corrosion resistant layer 19, the aluminum strip base material 17, the corrosion resistant layer 19, and the hydrophilic layer 20 in this order in the Y direction. ..
  • a hydrophilic layer 20 is provided on the outside of the corrosion resistant layer 19. The hydrophilic layer 20 improves the heat exchange performance of the fins 8 and prevents dew splash defects.
  • the aluminum strip base material 17 is exposed at the end portion 16b. That is, the aluminum strip base material 17 is exposed to the outside. Therefore, in the first embodiment, as shown in FIGS. 3 and 6, a corrosion resistant layer 18 is provided on the end portion 16b. This can prevent corrosion from the end portion 16b.
  • the corrosion resistant layer 18 may be provided only on the side surface of the aluminum strip base material 17, but as shown in FIG. 6, at the end portion 16b, the side surface of the aluminum strip base material 17, the side surface of the corrosion resistant layer 19, and the corrosion resistant layer 19 are provided. It is desirable that it is provided over the side surface of the hydrophilic layer 20.
  • the aluminum strip base material 17 is exposed at the end portion 16a. Therefore, in the first embodiment, as shown in FIGS. 3 and 5, a corrosion resistant layer 18 is provided on the end portion 16a. This makes it possible to prevent corrosion from the end portion 16a.
  • the corrosion resistant layer 18 may be provided only on the side surface of the aluminum strip base material 17, but as shown in FIG. 5, at the end portion 16a, the side surface of the aluminum strip base material 17, the side surface of the corrosion resistant layer 19, and the corrosion resistant layer 19 are provided. It is desirable that it is provided over the side surface of the hydrophilic layer 20.
  • the fin 8 according to the first embodiment is formed by cutting the aluminum strip, in the state after the cutting process, the end portions 16a and 16b have the aluminum strip base material 17 on the exposed cut surface. It has become. Therefore, in the first embodiment, the corrosion resistant layer 18 is provided on the end portions 16a and 16b including the cut surface where the aluminum strip base material 17 is exposed. Further, on the main surface 51 of the fin 8, a double layer composed of a corrosion resistant layer 19 and a hydrophilic layer 20 is formed as a precoat film 50. As a result, the main surface 51 of the fin 8 can prevent corrosion while maintaining hydrophilicity.
  • the hydrophilic layer 20 is a film having a function of improving the wettability and spreading characteristics of water on the main surface 51 of the fin 8.
  • the hydrophilic layer 20 has a contact angle of, for example, 50 ° or less, preferably 30 ° or less with respect to water. Due to its nature, the hydrophilic layer 20 has good compatibility with water, so that water easily permeates the hydrophilic layer 20. Therefore, the dew condensation water adhering to the main surface 51 of the fin 8 flows downward along the hydrophilic layer 20 in the Z direction in FIG. 2 and is collected by a drain pan (not shown) arranged at the lower part of the fin 8. , Drained from the drain pan.
  • the dew condensation water adhering to the surface of the fin 8 can be quickly drained, so that the heat exchange efficiency of the fin 8 can be improved. This will be described below.
  • FIG. 10 is a reference diagram schematically showing the fin 8 when the hydrophilic layer 20 is not applied.
  • the hydrophilic layer 20 is not provided on the fins 8, as shown in FIG. 10, the dew condensation water adhering to the adjacent fins 8 is connected to each other to form a dew condensation water bridge 60.
  • the ventilation resistance increases and it becomes difficult for air to flow between the fins 8.
  • the load on the indoor heat exchanger 2 increases, and the heat exchange performance also deteriorates.
  • the hydrophilic layer 20 is provided on the fin 8
  • the dew condensation water can be easily drained, and the formation of the dew condensation water bridge 60 can be prevented.
  • the ventilation resistance is smaller than that in the reference diagram of FIG. 10, it is possible to suppress an increase in the load of the indoor heat exchanger 2 and prevent a decrease in heat exchange performance.
  • the corrosion resistant layer 19 is provided between the hydrophilic layer 20 and the aluminum strip base material 17. Since the corrosion-resistant layer 19 does not allow moisture to permeate, it is possible to prevent the moisture that has permeated through the hydrophilic layer 20 from permeating toward the aluminum strip base material 17.
  • the corrosion-resistant layer 19 is a film having a function of protecting the aluminum strip base material 17 from water, and has a function of preventing the permeation of water. Epoxy-based, acrylic-based, urethane-based and other materials are used for the corrosion-resistant layer 19. Since the corrosion-resistant layer 19 has a waterproof function, it has poorer water compatibility than the hydrophilic layer 20, and the contact angle with water is often 40 ° or more, for example.
  • the corrosion-resistant layer 19 may be called a waterproof layer, a water-repellent layer, a corrosion-proof layer, or the like because of its function.
  • corrosion resistant layers 18 are provided at the ends 16a and 16b of the fins 8, and the outermost surface 51 of the fins 8 is provided with a corrosion resistant layer 18.
  • a hydrophilic layer 20 is provided on the outer surface.
  • a corrosion resistant layer 19 is provided between the hydrophilic layer 20 and the aluminum strip base material 17.
  • the cut surface of the fin 8 is covered with the corrosion resistant layer 18, it is possible to prevent the elution of aluminum ions from the cut surface. As a result, it is possible to suppress the water repellency of the main surface 51 of the fin 8. Therefore, in the first embodiment, even when the indoor unit is installed in a water-repellent environment, it is effective in suppressing the dew-spraying defect due to the water-repellent effect of the indoor heat exchanger 2.
  • the outdoor heat exchanger 3 may also have the same configuration as the indoor heat exchanger 2.
  • the outdoor unit is installed in an environment harsh against corrosion such as a salt-damaged area, it is conceivable that corrosion will proceed from the cut surface of the fin 8.
  • the precoat film 50 applied to the fins 8 disappears or corrodes, clogging between the fins 8 or dropping of the fins 8 may occur. In that case, the heat exchange performance of the outdoor heat exchanger 3 deteriorates.
  • the cut surface of the fin 8 is covered with the corrosion resistant layer 18, even when the outdoor unit is installed in an environment harsh against corrosion such as a salt-damaged area, corrosion from the cut surface of the fin 8 is prevented. can do. As a result, deterioration of the heat exchange performance of the outdoor heat exchanger 3 can be prevented for a long period of time.
  • FIG. 7 is a flowchart showing a processing flow of the heat exchanger manufacturing method according to the first embodiment.
  • FIG. 8 is a schematic perspective view showing a step of applying the corrosion-resistant layer 18 in the method for manufacturing the heat exchanger according to the first embodiment. Note that FIG. 8 shows an example of the coating process, and is not limited to the method as long as the corrosion resistant layer 18 can be coated only on the cut surface of the fin 8. Since the indoor heat exchanger 2 and the outdoor heat exchanger 3 basically have the same configuration, here, the manufacturing method of the indoor heat exchanger 2 will be described, and the manufacturing method of the outdoor heat exchanger 3 will be described. The description of is omitted.
  • the device includes two roll coaters 21, two ultraviolet lamps 22, and a box-shaped shielded housing 23.
  • the device may have a first motor 41 and a second motor 42, if necessary.
  • the first motor 41 rotates and drives the roll coater 21.
  • the second motor 42 moves the laminated fins 8 in the direction of arrow A.
  • the operations of the first motor 41 and the second motor 42 are controlled by a control device (not shown).
  • the two roll coaters 21 have a cylindrical shape.
  • the two roll coaters 21 are arranged so as to be rotatable in the circumferential direction with the rotation shaft 21a provided at the center in the radial direction as an axis.
  • the rotation shaft 21a extends in the Y direction.
  • the two roll coaters 21 are arranged so as to face each other via the first gap.
  • the width of the first gap is adjusted to match the length of the end portion 16b on the short side side of the fin 8. Therefore, when the laminated fins 8 are arranged between the two roll coaters 21, the circumferential surface of the roll coater 21 comes into contact with the end portion 16a on the long side of the fins 8.
  • the surface of the two roll coaters 21 in the circumferential direction is impregnated with food resistant ingredients.
  • the two ultraviolet lamps 22 are arranged so as to face each other via the second gap.
  • the two ultraviolet lamps 22 irradiate ultraviolet light toward the end portion 16a on the long side of the fin 8. Therefore, the radiating surfaces of the two ultraviolet lamps 22 that emit ultraviolet light are arranged so as to face each other via the second void.
  • the width of the second void is larger than that of the first void. Therefore, when the laminated fins 8 are arranged between the two ultraviolet lamps 22, the radiation surface of the ultraviolet lamps 22 does not come into contact with the end portion 16a on the long side of the fins 8.
  • the two ultraviolet lamps 22 irradiate ultraviolet light toward the end portion 16a on the long side of the fin 8.
  • the two ultraviolet lamps 22 are housed in a box-shaped shield housing 23.
  • the shield housing 23 has a light-shielding property and shields ultraviolet light emitted from the two ultraviolet lamps 22 so as not to leak to the outside.
  • step S1 the hairpin tube insertion hole 14 and the louver 15 are formed in the aluminum strip coated with the precoat film 50. After that, the aluminum strip is cut so as to have the shape of the fin 8. As a result, a plurality of rectangular plate-shaped fins 8 having the same shape are formed.
  • the order of the steps executed in step S1 is not particularly limited. Therefore, for example, the hairpin tube insertion hole 14 and the louver 15 may be formed after cutting the aluminum strip into the shape of the fin 8.
  • step S2 a plurality of fins 8 are laminated.
  • a plurality of fins 8 are laminated.
  • they are arranged so that the main surfaces 51 of the fins 8 face each other with a space between them.
  • the positions of the end portions 16a of the plurality of fins 8 are arranged so as to be aligned as an example.
  • a roll coater 21 is used to apply an ultraviolet curable resin as a food resistant to the end portion 16a of the laminated fins 8.
  • the roll coater 21 is rotatably installed.
  • the roll coater 21 may be arranged only on one side of the fin 8, but as shown in FIG. 8, by installing the roll coater 21 on both sides of the fin 8, the two ends 16a of the fin 8 can be arranged at one time.
  • an ultraviolet curable resin can be applied.
  • the roll coater 21 is rotationally driven by the first motor 41. Further, the laminated fins 8 are moved in the direction of arrow A by the second motor 42.
  • step S4 the ultraviolet curable resin is irradiated with ultraviolet light emitted from the ultraviolet lamp 22 to cure the ultraviolet curable resin.
  • the cured ultraviolet curable resin becomes the corrosion resistant layer 18.
  • the ultraviolet lamps 22 on both sides of the fin 8
  • the ultraviolet curable resin applied to the two end portions 16a of the fin 8 can be cured at once.
  • the corrosion resistant layer 18 is fixed to the end portion 16a of the fin 8.
  • the shield housing 23 that does not transmit ultraviolet rays so that the ultraviolet light emitted from the ultraviolet lamp 22 does not cure the ultraviolet curable resin on the roll coater 21. It is desirable to surround the ultraviolet lamp 22 with.
  • the box-shaped shield housing 23 is shown, but the shape of the shield housing 23 is not particularly limited.
  • step S4 the ultraviolet lamp 22 is fixed and the fin 8 is moved in the direction of the arrow A to irradiate the entire end portion 16a of the fin 8 with ultraviolet light.
  • the ultraviolet lamp 22 may be moved in the direction of the arrow A to irradiate the entire end portion 16a of the fin 8 with ultraviolet light.
  • the shield housing 23 may be synchronized with the ultraviolet lamp 22 and moved together with the ultraviolet lamp 22.
  • step S5 the hairpin tube 10 is bent into a U shape.
  • the process of step S5 may be performed in parallel with the process of steps S1 to S4, but the timing of the process of performing step S5 is not particularly limited. That is, step S5 may be performed after steps S1 to S4, or steps S1 to S4 may be performed after step S5.
  • step S6 the fixing plate 32 is provided in the laminated fins 8, and the hairpin tube 10 bent into a U shape is inserted into the hairpin tube insertion hole 14 of the fins 8.
  • step S7 the hairpin tube 10 is expanded by a tube expansion process using a tool such as a mandrel to improve the adhesion between the fin 8 and the hairpin tube 10.
  • the mandrel is a tool in which a tube expansion ball is provided at the tip of a rod.
  • step S8 the U-shaped bend 11 is attached to the end 10c of the hairpin tube 10.
  • step S9 the end portion 10c of the hairpin tube 10 and the bend 11 are joined by brazing.
  • FIG. 9 is a schematic perspective view showing a modified example of the process shown in FIG.
  • the ultraviolet curable resin is applied only to the end portion 16a on the long side side of the fin 8 and cured is shown.
  • the UV curable resin is also applied to the end portion 16b on the short side of the fin 8 to form the corrosion resistant layer 18. Therefore, as shown in FIG. 9, for the configuration of the apparatus shown in FIG. 8, a second roll coater 26 for applying the ultraviolet curable resin to the end portion 16b on the short side side of the fin 8 is further provided. You may do it.
  • FIG. 9 for the configuration of the apparatus shown in FIG. 8, a second roll coater 26 for applying the ultraviolet curable resin to the end portion 16b on the short side side of the fin 8 is further provided. You may do it.
  • the second roll coater 26 has a cylindrical shape.
  • the second roll coater 26 is rotatably arranged in the circumferential direction with the rotation shaft 26a provided at the center in the radial direction as an axis.
  • the rotation shaft 26a extends in the X direction.
  • the second roll coater 26 is provided so as to be movable in the direction of the arrow B.
  • the ultraviolet curable resin can be applied to the end portion 16b of the fin 8.
  • the applied ultraviolet curable resin is cured by irradiating with ultraviolet light emitted from the ultraviolet lamp 22.
  • the second roll coater 26 is rotationally driven by the third motor 43 and is moved in the direction of arrow B by the fourth motor 44.
  • the fin 8 is provided with a hairpin tube insertion hole 14 and a louver 15. Since the hairpin tube insertion hole 14 and the louver 15 are formed by cutting and raising, the aluminum strip base material 17 is formed at both ends of the fin collar 14a of the hairpin tube insertion hole 14 and the protruding portions 15b of the louver 15. It is an exposed cut surface. Therefore, the corrosion resistant layer 18 may be formed on these cut surfaces as well. In that case, the corrosion prevention effect of the aluminum strip base material 17 can be further improved.
  • FIG. 11 is a diagram showing an example of a step of applying an ultraviolet curable resin to both end portions 15bb of the protrusions 15b in the method for manufacturing a heat exchanger according to the first embodiment.
  • the both end portions 15bb of the protrusion 15b are the ends of the protrusion 15b on the slit 15a side.
  • FIG. 11 is a side view of the fin 8 as viewed in the direction of arrow C in FIG.
  • a plurality of protruding portions 15b of the louver 15 are arranged side by side on the fin 8.
  • a tool 24 such as a brush is arranged in accordance with the positions of both ends 15bb of the protrusion 15b.
  • the tool 24 has a large number of hairs attached to the tip of a handle made of metal, wood, plastic, or the like.
  • the UV curable resin is applied to both ends 15bb of the protruding portion 15b by the tool 24.
  • the applied ultraviolet curable resin is cured by irradiating it with ultraviolet light.
  • Each tool 24 is fixed to a common drive bar 25. By moving the drive bar 25 in the Y direction, the position of the tool 24 is adjusted with respect to the height position of both ends 15bb of the protrusion 15b, and the ultraviolet curable resin is applied to both ends 15bb of the protrusion 15b. As shown in FIG.
  • the tool 24 is used when applying the ultraviolet curable resin to both end portions 15bb of the protrusions 15b. Either move it in the Z direction, or move the fin 8 in the Z direction. As a result, the ultraviolet curable resin can be sequentially applied to both end portions 15bb of the protruding portions 15b of the louvers 15 arranged in the Z direction. Further, if it is desired to skip the portion of the fin collar 14a without applying the ultraviolet curable resin, the drive bar 25 is moved toward the upper side in the Y direction. In this way, by using the common drive bar 25, the ultraviolet curable resin can be applied to the plurality of protrusions 15b at one time.
  • the drive bar 25 is driven by a motor or the like.
  • a brush is taken as an example of the tool 24, but the present invention is not limited to this case.
  • the tool 24 may be another tool such as a brush, a roller, or a spatula.
  • the tool 24 may be any tool other than these as long as it can apply the ultraviolet curable resin to both ends 15bb of the protruding portion 15b.
  • the drive bar 25 is driven by the fifth motor 45.
  • the applied ultraviolet curable resin is cured by irradiating ultraviolet light with an ultraviolet lamp 22, and becomes a corrosion resistant layer 27 as a third corrosion resistant layer.
  • the cut surface formed on the fin 8 when the hairpin tube insertion hole 14 or the louver 15 is processed. Further, by forming the corrosion-resistant layer 27 as the third corrosion-resistant layer, it is possible to further improve the effect of preventing aluminum corrosion and preventing dew-spraying defects.
  • the corrosion resistant layers 18 and 27 can be formed without damaging the precoat film 50.
  • a baking-type paint is used as the corrosion-resistant layer, the precoat film 50 deteriorates due to the heat load during firing, and the hydrophilicity and corrosion resistance are deteriorated, or the precoat film 50 is burned off (phenomenon or May cause disappearance). Therefore, in the first embodiment, by using the ultraviolet curable resin for the corrosion resistant layers 18 and 27, it is possible to form the corrosion resistant layers 18 and 27 on the cut surface of the aluminum strip without damaging the precoat film 50. Become.
  • the fin 8 has a plate-shaped aluminum strip base material 17 having a main surface and side surfaces, and a hydrophilic layer 20 provided on the main surface of the aluminum strip base material 17. It has a corrosion-resistant layer 19 provided between the main surface of the aluminum strip base material 17 and the hydrophilic layer 20. Further, the fin 8 is provided with a corrosion resistant layer 18 provided on the side surface of the aluminum strip base material 17. By providing the hydrophilic layer 20, the hydrophilicity of the fin 8 can be maintained. Further, by providing the corrosion resistant layers 19 and 18, it is possible to secure the corrosion resistance of the heat exchanger for a long period of time. Therefore, it is possible to improve the heat exchange performance of the heat exchanger and prevent problems such as dew splash.
  • the ultraviolet curable resin is applied using the roll coater 21 in a state where the fins 8 are laminated. Since the fins 8 are laminated, the end portions 16a of the plurality of fins 8 are aligned, so that the ultraviolet curable resin can be easily applied to the end portions 16a of the plurality of fins 8 at one time. ..

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

Abstract

La présente invention concerne un échangeur de chaleur comprenant : une pluralité d'ailettes agencées espacées les unes des autres dans une première direction ; et une pluralité de tubes de transfert de chaleur qui pénètrent dans la pluralité d'ailettes et sont agencés espacés les uns des autres dans une seconde direction croisant la première direction. Chacune des ailettes de la pluralité d'ailettes comprend : un matériau de base en bande d'aluminium de type plaque doté d'une surface principale et d'une surface latérale qui forme la périphérie de la surface principale ; une couche hydrophile disposée sur la surface principale du matériau de base en bande d'aluminium ; une première couche résistante à la corrosion disposée entre la surface principale du matériau de base en bande d'aluminium et la couche hydrophile ; et une seconde couche résistante à la corrosion disposée sur la surface latérale du matériau de base en bande d'aluminium.
PCT/JP2020/039526 2020-10-21 2020-10-21 Échangeur de chaleur et procédé de fabrication d'échangeur de chaleur Ceased WO2022085105A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2022556286A JP7387021B2 (ja) 2020-10-21 2020-10-21 熱交換器、及び、熱交換器の製造方法
CN202080106003.7A CN116235016A (zh) 2020-10-21 2020-10-21 热交换器以及热交换器的制造方法
PCT/JP2020/039526 WO2022085105A1 (fr) 2020-10-21 2020-10-21 Échangeur de chaleur et procédé de fabrication d'échangeur de chaleur

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PCT/JP2020/039526 WO2022085105A1 (fr) 2020-10-21 2020-10-21 Échangeur de chaleur et procédé de fabrication d'échangeur de chaleur

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Publication number Priority date Publication date Assignee Title
JPH03146168A (ja) * 1989-10-31 1991-06-21 Maoka Matsushita Denko Kk ロール塗装方法
JPH09179132A (ja) * 1995-12-27 1997-07-11 Optrex Corp 液晶表示素子における液晶注入孔の封止方法
JP2006214621A (ja) * 2005-02-02 2006-08-17 Daikin Ind Ltd 熱交換器用アルミニウム製フィン、このフィンを用いた熱交換器及びこの熱交換器を用いた空気調和装置又は冷凍装置
JP2011163646A (ja) * 2010-02-09 2011-08-25 Sumitomo Light Metal Ind Ltd 熱交換器用アルミニウムフィン及び熱交換器
JP2012024738A (ja) * 2010-07-27 2012-02-09 Nippon Steel Engineering Co Ltd 薄鋼板端面への液状物塗布方法
JP2013100933A (ja) * 2011-11-08 2013-05-23 Daikin Industries Ltd 空気調和装置用の熱交換器
JP2018522089A (ja) * 2015-05-21 2018-08-09 サン ケミカル コーポレイション 超疎水性ｕｖ硬化性コーティング
JP2019113250A (ja) * 2017-12-22 2019-07-11 三菱アルミニウム株式会社 熱交換器用アルミニウムフィン材および熱交換器
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