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US20100089562A1 - Heat exchanger - Google Patents

Heat exchanger Download PDF

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Publication number
US20100089562A1
US20100089562A1 US12/527,364 US52736408A US2010089562A1 US 20100089562 A1 US20100089562 A1 US 20100089562A1 US 52736408 A US52736408 A US 52736408A US 2010089562 A1 US2010089562 A1 US 2010089562A1
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US
United States
Prior art keywords
heat exchanger
cut
heat transfer
slits
exchanger according
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.)
Abandoned
Application number
US12/527,364
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English (en)
Inventor
Yutaka Shibata
Hou Gaku
Haruo Nakata
Hideo Ohya
Takayuki Hyoudou
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.)
Daikin Industries Ltd
Original Assignee
Individual
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Filing date
Publication date
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Assigned to DAIKIN INDUSTRIES, LTD. reassignment DAIKIN INDUSTRIES, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: OHYA, HIDEO, NAKATA, HARUO, GAKU, HOU, HYOUDOU, TAKAYUKI, SHIBATA, YUTAKA
Publication of US20100089562A1 publication Critical patent/US20100089562A1/en
Abandoned legal-status Critical Current

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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
    • 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
    • F28F1/325—Fins with openings
    • 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
    • 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
    • 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
    • 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
    • F24F1/0067—Indoor units, e.g. fan coil units characterised by heat exchangers by the shape of the heat exchangers or of parts thereof, e.g. of their fins
    • 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
    • F24F13/30—Arrangement or mounting of heat-exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F17/00—Removing ice or water from heat-exchange apparatus
    • F28F17/005—Means for draining condensates from heat exchangers, e.g. from evaporators

Definitions

  • the present invention relates to the structure of a heat exchanger for an air conditioner indoor unit.
  • a fin coil type air heat exchanger is generally employed as a heat exchanger for an air conditioner indoor unit.
  • condensed water generated on the surface of the heat exchanger (evaporator) during cooling operation flows down along the fin surfaces of the heat exchanger by its own weight. Then, the condensed water collects in a drain pan located below the heat exchanger, and is discharged outside of the room (for example, refer to Patent Document 1).
  • the air conditioner indoor unit 1 includes an air heat exchanger 32 , which is folded to form a ⁇ -shape, and a cross-flow fan 31 .
  • the indoor unit 1 draws in the air from the upper surface and the front surface of the indoor unit 1 , and blows out the air diagonally downward from the bottom surface of the indoor unit 1 .
  • the indoor unit 1 includes a cassette type main casing 20 .
  • the main casing 20 is installed on the wall with the back panel abut against the wall surface.
  • An inlet port 25 for drawing in the air is formed in the front surface and the upper surface of the main casing 20 .
  • the air heat exchanger 32 and the cross-flow fan 31 are located in the main casing 20 .
  • the air heat exchanger 32 is configured by a front heat exchanging section 32 a and a rear heat exchanging section 32 b .
  • the cross-flow fan 31 is located below the front heat exchanging section 32 a and the rear heat exchanging section 32 b .
  • the cross-flow fan 31 blows out the conditioned air diagonally downward through a scroll-type flow duct 30 and an outlet port 29 of the main casing 20 .
  • the lower ends of the front heat exchanging section and the rear heat exchanging section 32 a , 32 b are secured to and supported by drain pans 28 a , 28 b , respectively.
  • the heat exchanging sections 32 a , 32 b each include heat transfer tubes 12 , heat transfer fins 13 a , cut-and-raised pieces 14 , and tube plates, which are not shown.
  • the heat transfer tubes 12 are arranged in two rows in upstream and downstream of air flow F to be displaced from each other.
  • the heat transfer fins 13 a are arranged at a predetermined pitch along the axis of the heat transfer tubes 12 , and are arranged parallel to each other.
  • the cut-and-raised pieces 14 are formed of slits or louvers, and are provided on the heat transfer surface of each heat transfer fin 13 a on the upper side and the lower side of each heat transfer tube 12 .
  • Each cut-and-raised piece 14 is formed of four rows of slits or louvers, which are arranged from upstream to downstream of the airflow F (from the left side to the right side of FIG. 22 ).
  • cut-and-raised pieces 14 a located in the vicinity of the side edges of each heat transfer fin 13 a , 13 b are longer than cut-and-raised pieces 14 b located at the center of the heat transfer fins 13 a , 13 b.
  • the cross-flow fan 31 which is blowing means, is actuated during cooling operation or warming operation, the air in the room is drawn in via the inlet port 25 . Then, conditioned air (cool air or warm air) that has low pressure drop and has been subjected to even heat exchange is blown out from the outlet port 29 of the main casing 20 via the ⁇ -shaped heat exchanger 32 that has a large heat exchange area and a wide air intake area. The conditioned air that is blown out in this manner flows downward so that comfortably cooled or warmed indoor environment is achieved.
  • conditioned air cool air or warm air
  • the front and rear heat exchanging sections 32 a , 32 b are arranged substantially along the vertical direction. That is, the heat exchanging sections 32 a , 32 b are arranged at extremely small inclination angle with respect to the vertical axis.
  • the condensed water generated in the heat exchanger flows downward along the fin surfaces by its own weight, and collects in the drain pans 28 a , 28 b.
  • the fin pitch of the heat transfer fins 13 a , 13 b is actually narrow, and due to, for example, decrease in the hydrophilicity of the fin surface, the condensed water is kept retained on the fins and the cut-and-raised pieces and is hindered from flowing downward although the heat exchanger is substantially arranged along the vertical direction.
  • a main portion 42 a of a heat exchanger 42 is tilted downward by a large amount with respect to the vertical axis as shown in FIG. 23 .
  • the gravity does not act along the longitudinal direction of the fins and the cut-and-raised pieces.
  • the direction of the gravity and the direction of wind are opposite from each other.
  • the behavior of the condensed water tends to become unstable, and water tends to spatter from the outlet port 49 .
  • FIG. 23 shows the air conditioner indoor unit 1 , a ceiling 3 , a flow duct 40 , a cross-flow fan 41 , the main portion 42 a of the heat exchanger 42 , an upper end portion 42 b of the heat exchanger 42 , a ceiling panel 44 , an air inlet port 45 , an air outlet port 49 , a main casing 50 , and first to third drain pans 48 a to 48 c.
  • Patent Document 1 Japanese Laid-Open Patent Publication No. 2004-353914
  • heat exchanger suitable for an air conditioner indoor unit, which heat exchanger promotes downward flow of condensed water by a linear portion that are provided on the lower end of or on the upper and lower ends of cut-and-raised pieces to extend along the lengthwise direction.
  • a first aspect of the present invention provides a heat exchanger including a heat transfer tube, heat transfer fins arranged along a direction perpendicular to an axis of the heat transfer tube to be parallel to each other, and a cut-and-raised piece provided on a heat transfer surface of each heat transfer fin.
  • a linear portion is provided at the lower end of each cut-and-raised piece. The linear portion extends downward and guides condensed water generated on the heat transfer surface downward.
  • the condensed water smoothly flows down via the linear portions without being retained between the heat transfer fins, in particular, between the cut-and-raised pieces of the heat transfer fins.
  • adhesion of environmental suspended matter on the fin surfaces, breeding of bacteria, and corrosion of fins are prevented.
  • drainage during cooling operation is also improved, the cooling performance is improved, the ventilation resistance is reduced, and spattering of water is prevented.
  • a linear portion which extends upward and guides condensed water downward, is preferably provided at the upper end of each cut-and-raised piece.
  • the condensed water smoothly enters the cut-and raised piece without being retained between the heat transfer fins, and in particular, at the upper end of the cut-and-raised piece.
  • the condensed water then smoothly flows down via the linear portion, which extends downward from the lower end of the cut-and-raised piece.
  • adhesion of environmental suspended matter on the fin surfaces, breeding of bacteria, and corrosion of fins are more effectively prevented.
  • drainage during cooling operation is also improved, the cooling performance is improved, the ventilation resistance is reduced, and spattering of water is prevented.
  • the cut-and-raised piece is split into an upper part and a lower part, and the linear portion, which extends along a lengthwise direction and guides the condensed water downward, is preferably provided between the upper part and the lower part.
  • the condensed water is guided downward by the linear portion also between the upper part and the lower part of the split cut-and-raised piece.
  • the condensed water is effectively discharged.
  • each linear portion is preferably connected to the inside of the associated cut-and-raised piece.
  • the condensed water that flows along the linear portions smoothly enters the cut-and-raised pieces. Furthermore, the condensed water smoothly flows downward and out of the cut-and-raised piece and falls downward of the heat transfer fin. Thus, the condensed water is further efficiently discharged from the cut-and-raised piece.
  • each cut-and-raised piece is inclined, and the linear portions are preferably provided at narrow angle portions of the upper end and the lower end of each cut-and-raised pieces.
  • the inclination angle at the upper end and the lower end of the slit is large, and the upper end and the lower end are formed along the arc around each heat transfer tube.
  • the condensed water that flows down to the slits tends to be retained in the vicinity of the upper end surface of the slits, and does not flow down for a long time after the operation of the air-conditioner is stopped.
  • the condensed water in the vicinity of the upper ends of the cut-and-raised pieces smoothly flows into the cut-and-raised pieces from the narrow angle portions of the cut-and-raised pieces, and the condensed water in the cut-and-raised pieces smoothly flows down from the narrow angle portions at the lower ends of the cut-and-raised pieces.
  • each cut-and-raised piece is inclined, and the linear portion at the upper end of each cut-and-raised piece is preferably provided at a wide angle portion of the cut-and-raised piece.
  • the linear portion is preferably provided at the center of the end portions of each cut-and-raised piece.
  • the linear portions preferably extend along a step pitch of the heat transfer fins.
  • each cut-and-raised piece preferably extends diagonally to avoid a fin collar in which the heat transfer tube is inserted.
  • the above-mentioned heat exchanger preferably includes a drainage rib, which is located along a front edge or a rear edge of the heat transfer fins.
  • the drainage rib is located close to or connected to the linear portion at the lower end of each cut-and-raised piece.
  • the condensed water is guided to the drainage rib by the linear portion at the lower end of each cut-and-raised piece, and the condensed water is further efficiently discharged via the drainage rib.
  • the linear portions are preferably linear cuts.
  • the condensed water that flows along the linear cuts smoothly enters the cut-and-raised pieces. Then, the condensed water in the cut-and-raised pieces smoothly flows down from the cut-and-raised pieces, and falls downward of the heat transfer fins. Thus, the condensed water is further effectively discharged from the cut-and-raised piece. Furthermore, the ventilation resistance is reduced as compared to the case where the linear portions are grooves.
  • the linear portions are preferably grooves.
  • the condensed water that flows along the linear grooves smoothly enters the cut-and-raised pieces. Then, the condensed water in the cut-and-raised pieces smoothly flows down from the cut-and-raised pieces, and falls downward of the heat transfer fins. Thus, the condensed water is further effectively discharged from the cut-and-raised pieces.
  • the cut-and-raised pieces are preferably louvers.
  • the condensed water smoothly flows down via the linear portions, which extend from the upper end and the lower end of each cut-and-raised piece without being retained between the heat transfer fins, in particular, in the cut-and-raised piece formed of louvers.
  • adhesion of environmental suspended matter on the fin surfaces, breeding of bacteria, and corrosion of fins are prevented.
  • drainage is also improved during cooling operation, the cooling performance is improved, the ventilation resistance is reduced, and spattering of water is prevented.
  • the heat exchanger is preferably a heat exchanger for an air conditioner indoor unit.
  • FIG. 1 is a partial front view illustrating an air heat exchanger according to a first embodiment of the present invention
  • FIG. 2 is an enlarged partial cross-sectional view illustrating the main part of the air heat exchanger
  • FIG. 3 is a partial front view illustrating an air heat exchanger according to a second embodiment of the present invention.
  • FIG. 4 is an enlarged partial cross-sectional view illustrating the main part of the air heat exchanger
  • FIG. 5 is a partial front view illustrating an air heat exchanger according to a third embodiment of the present invention.
  • FIG. 6 is a partial front view illustrating an air heat exchanger according to a fourth embodiment of the present invention.
  • FIG. 7 is a partial front view illustrating an air heat exchanger according to a fifth embodiment of the present invention.
  • FIG. 8 is a partial front view illustrating an air heat exchanger according to a sixth embodiment of the present invention.
  • FIG. 9 is a partial front view illustrating an air heat exchanger according to a seventh embodiment of the present invention.
  • FIG. 10 is a partial front view illustrating an air heat exchanger according to an eighth embodiment of the present invention.
  • FIG. 11 is a partial front view illustrating an air heat exchanger according to a ninth embodiment of the present invention.
  • FIG. 12 is a partial front view illustrating an air heat exchanger according to a tenth embodiment of the present invention.
  • FIG. 13 is a partial front view illustrating an air heat exchanger according to an eleventh embodiment of the present invention.
  • FIG. 14 is a partial front view illustrating an air heat exchanger according to a twelfth embodiment of the present invention.
  • FIG. 15 is a partial front view illustrating an air heat exchanger according to a thirteenth embodiment of the present invention.
  • FIG. 16 is a partial front view illustrating an air heat exchanger according to a fourteenth embodiment of the present invention.
  • FIG. 17 is a partial front view illustrating an air heat exchanger according to a fifteenth embodiment of the present invention.
  • FIGS. 18( a ) to 18 ( c ) are enlarged partial cross-sectional views illustrating the main part of the air heat exchanger
  • FIG. 19 is a partial front view illustrating an air heat exchanger according to a sixteenth embodiment of the present invention.
  • FIGS. 20( a ) to 20 ( e ) are enlarged partial cross-sectional views illustrating the main part of the air heat exchanger that is common to the embodiments;
  • FIG. 21 is a cross-sectional view illustrating an air conditioner indoor unit including a first conventional air heat exchanger
  • FIG. 22 is a partial cross-sectional view illustrating the main part of the air heat exchanger
  • FIG. 23 is a cross-sectional view illustrating an air conditioner indoor unit including a second conventional air heat exchanger.
  • FIG. 24 is a partial cross-sectional view illustrating the main part of a third conventional air heat exchanger.
  • FIGS. 1 and 2 show the structure and operation of an air heat exchanger according to a first embodiment of the present invention suitable for an air conditioner indoor unit (refer to FIGS. 21 and 23 ).
  • An air heat exchanger 32 ( 32 b ) is configured by heat transfer tubes 12 , heat transfer fins 13 a , 13 b , cut-and-raised pieces 14 , and tube plates, which are not shown.
  • the heat transfer tubes 12 are arranged in two rows in upstream (front side) and downstream (rear side) of the airflow F, and are displaced from each other.
  • the heat transfer fins 13 a , 13 b are arranged at a predetermined pitch along the axes of the heat transfer tubes 12 , and are parallel to each other.
  • the cut-and-raised pieces 14 include slits 14 a , 14 b and are located on the heat transfer surface of each heat transfer fin 13 a on the upper side and the lower side of each heat transfer tube 12 .
  • the tube plates are located in the vicinity of the ends in the arrangement direction of the heat transfer fins 13 a , 13 b.
  • Each cut-and-raised piece 14 includes four rows of slits 14 a , 14 b , which are arranged from upstream to downstream of the airflow F (from the left side to the right side in the drawing).
  • the cut-and-raised pieces 14 b located in the vicinity of the side edges of each heat transfer fin 13 a , 13 b are longer than the cut-and-raised pieces 14 a located at the center of the heat transfer fin 13 a , 13 b.
  • the slits 14 a , 14 b of the cut-and-raised pieces 14 include an upper end and a lower end having a predetermined inclination angle.
  • Linear portions, which extend upward or downward, are provided along the front edge of the slits 14 a , 14 b at the upper end and the lower end of the front two rows of slits 14 a , 14 b .
  • Linear portions, which extend upward and downward, are also provided along the rear edge of the slits 14 a , 14 b at the upper end and lower end of the rear two rows of slits 14 b , 14 a .
  • the linear portions guide the condensed water downward by capillary action. More specifically, the linear portions are linear cuts (a cut portion shown in FIG. 20( a )) a, b, and are connected to the inside of the slits 14 a , 14 b.
  • This structure inhibits the operation in which the condensed water flows into the slits 14 a , 14 b without flowing around the upper end surface of the slits 14 a , 14 b after the condensed water generated on the fin surfaces of the heat transfer fins 13 a , 13 b concentrates in the cuts a that extend from the upper end of the slits 14 a , 14 b . Thereafter, the condensed water smoothly flows toward the lower ends of the heat transfer fins 13 a , 13 b via cuts b that extend from the lower ends of the slits 14 a , 14 b . The condensed water then flows into drain pans (refer to 28 a , 28 b in FIG. 5 ) located below the heat transfer fins 13 a , 13 b through the heat transfer fins 13 a , 13 b.
  • the condensed water is not retained at the upper end surface and the lower end surface of the cut-and-raised pieces 14 .
  • adhesion of environmental suspended matter on the fin surfaces, breeding of bacteria, and corrosion of fins are prevented.
  • drainage is improved during cooling operation, thus improving the cooling performance, reducing the ventilation resistance, and preventing spattering of water.
  • the cross fin coil type air heat exchanger suitable for the air conditioner indoor unit as shown in FIGS. 21 and 23 is easily manufactured with low costs.
  • the heat exchanger prevents adhesion of environmental suspended matter on the fin surfaces, breeding of bacteria, and corrosion of fins, and has excellent drainage during cooling operation, thus improving the cooling performance, reducing the ventilation resistance, and preventing spattering of water.
  • the cut-and-raised pieces 14 may be formed using, for example, louvers. Also, the shape and the number of the slits 14 a , and the number of rows of the slits 14 a may be changed. Furthermore, the cuts a, b may be changed to linear grooves that are shallow and narrow. Unlike the grooves, the cuts have no projecting surfaces, which is advantageous in that the ventilation resistance is hardly generated.
  • FIGS. 3 and 4 show the structure of an air heat exchanger according to a second embodiment of the present invention suitable for an air conditioner indoor unit.
  • the split type slits 14 a are employed as the cut-and-raised pieces 14 located in the vicinity of the side edges of the heat transfer fins 13 a , 13 b like the conventional example of FIG. 24 in the cross fin coil type air heat exchanger that is the same as the first embodiment.
  • linear cuts (linear portions) a, b, c that extend along the lengthwise direction and have a predetermined length are provided at the upper end and the lower end of the slits 14 a , 14 b , and at the center of the slits 14 a .
  • the cut b located between the split slits 14 a is connected to the cut c extending downward and the cut a extending upward.
  • the condensed water that flows down along the fin surfaces enter the slits 14 a , 14 b via the linear portions a, b, and the condensed water smoothly flows downward and out of the slits 14 a , 14 b via the cuts b, c.
  • the condensed water is not retained in the slits 14 a , 14 b , and promptly flows downward. That is, the condensed water is smoothly discharged like the first embodiment.
  • FIG. 5 shows the structure of an air heat exchanger according to a third embodiment of the present invention suitable for an air conditioner indoor unit.
  • the split type slits 14 a are employed as the cut-and-raised pieces 14 like the second embodiment. Unlike the second embodiment, however, the split surfaces of the split part of the slits are not inclined but extend along the horizontal direction. Linear cuts (linear portions) a, b, c that extend along the lengthwise direction and have a predetermined length are provided at the upper end and the lower end of the slits 14 a , 14 b , and at the center of the slits 14 a .
  • the cut b located between the split slits 14 a is connected to the cut c extending downward and the cut b extending upward.
  • the condensed water that flows down along the fin surfaces enter the slits 14 a , 14 b via the linear portions a, b, and the condensed water smoothly flows downward and out of the slits 14 a , 14 b via the cuts b, c.
  • the condensed water is not retained in the slits 14 a , 14 b , and promptly flows downward.
  • the condensed water is smoothly discharged like the second embodiment.
  • FIG. 6 shows the structure of an air heat exchanger according to a fourth embodiment of the present invention suitable for an air conditioner indoor unit.
  • linear cuts that is, linear portions d, e, f that extend along the lengthwise direction and have a predetermined length are further provided between the laterally adjacent slits 14 a , 14 b.
  • the linear portions d, e are provided between the first row of the split type slit 14 a and the second row of the integrated slit 14 b .
  • the linear portions d, e are provided separately at two positions, which are the upper section and the lower section.
  • the linear portion f is provided between the second row of the integrated slit 14 b and the third row of the integrated slit 14 b .
  • the linear portion f is formed by a single line that continues from the upper end to the lower end.
  • the linear portions d, e are also provided between the third row of the integrated slit 14 b and the fourth row of the split type slit 14 a .
  • the linear portions d, e are provided separately at two positions, which are the upper section and the lower section.
  • the linear portions d, e, f all extend along the lengthwise direction.
  • the condensed water that flows down along the fin surfaces enter the slits 14 a , 14 b via the linear portions a, b, and the condensed water smoothly flows downward and out of the slits 14 a , 14 b via the cuts b, c.
  • the condensed water that remains on the fin surfaces between the slits 14 a , 14 b also smoothly flows down by the cuts d, e, f located between the slits 14 a , 14 b .
  • the condensed water is further smoothly discharged as compared to the third embodiment.
  • FIG. 7 shows the structure of an air heat exchanger according to a fifth embodiment of the present invention suitable for an air conditioner indoor unit.
  • the linear cuts a that extend from the upper ends of the slits 14 a , 14 b of the cross fin coil type air heat exchanger according to the third embodiment are not provided at the narrow angle portions, but are provided at the wide angle portions.
  • the condensed water on the fin surfaces tends to concentrate in a lower portion of the center of each fin collar in which the associated heat transfer tube 12 is inserted.
  • providing the linear cuts a at the wide angle portions of the upper ends of the slits 14 a , 14 b is advantageous in smoothly discharging the condensed water concentrating in a lower portion of the fin collars.
  • FIG. 8 shows the structure of an air heat exchanger according to a sixth embodiment of the present invention suitable for an air conditioner indoor unit.
  • the linear cuts a, b, c are provided at the narrow angle portions and at the split portions of the slits 14 a , 14 b
  • the cuts a, b, c are provided at the upper end center and the lower end center of the slits 14 a , 14 b as shown in FIG. 8 in the present embodiment.
  • the condensed water that flows down along the fin surfaces enter the slits 14 a , 14 b via the linear portions a, and the condensed water smoothly flows downward and out of the slits 14 a , 14 b via the cuts b, c.
  • the condensed water is not retained in the slits 14 a , 14 b , and promptly flows downward. Therefore, the condensed water is smoothly discharged like the third embodiment.
  • the cuts a, b, c can be formed at positions separate from the cut positions of the fins forming the slits. This adds to the flexibility of the working, prevents deformation of the fin surfaces caused when forming the slits, and inhibits increase in the ventilation resistance.
  • FIG. 9 shows the structure of an air heat exchanger according to a seventh embodiment of the present invention suitable for an air conditioner indoor unit.
  • the integrated slits 14 a , 14 b are employed as the cut-and-raised pieces 14 located in the vicinity of the side edges of the heat transfer fins 13 a , 13 b .
  • the cuts a, b are provided at the upper ends and the lower ends of the slits 14 a , 14 b , the cuts a at the upper ends of the slits are omitted.
  • this structure inhibits, as compared to the first embodiment, the operation in which the condensed water generated on the fin surfaces flow into the slits 14 a , 14 b without flowing around the upper end surfaces of the slits 14 a , 14 b , the condensed water is inhibited from flowing in from the top of the slits since the cuts are not formed at the upper ends of the slits 14 a , 14 b . Also, when forming the fin collars or the like, at least the upper cuts a do not interfere with fin collars 15 in which the heat transfer tubes 12 are inserted.
  • FIG. 10 shows the structure of an air heat exchanger according to an eighth embodiment of the present invention suitable for an air conditioner indoor unit.
  • diagonal split type slits 14 a are employed as the cut-and-raised pieces 14 located in the vicinity of the side edges of the heat transfer fins 13 a , 13 b .
  • the cuts a at the upper ends of the slits are omitted from the structure of the cross fin coil type air heat exchanger according to the second embodiment, in which the linear cuts (linear portions) a, b, c that extend along the lengthwise direction and have a predetermined length are provided at the upper ends and the lower ends of the slits 14 a , 14 b and at the center of the slits 14 a.
  • this structure inhibits, as compared to the second embodiment, the operation in which the condensed water flows into the slits 14 a , 14 b without flowing around the upper end surfaces of the slits 14 a , 14 b after the condensed water generated on the fin surfaces concentrates in the upper cuts a of the slits 14 a , 14 b , the condensed water is inhibited from flowing in from the top of the slits since the cuts are not formed at the upper ends of the slits 14 a , 14 b . Also, when forming the fin collars or the like, at least the upper cuts a do not interfere with the fin collars 15 in which the heat transfer tubes 12 are inserted. Also, since the split section of the slits is formed diagonally, the condensed water is promoted to flow from the upper part to the lower part of the split section.
  • FIG. 11 shows the structure of an air heat exchanger according to a ninth embodiment of the present invention suitable for an air conditioner indoor unit.
  • parallel split type slits 14 a are employed as the cut-and-raised pieces 14 located in the vicinity of the side edges of the heat transfer fins 13 a , 13 b .
  • the cuts a at the upper ends of the slits are omitted from the structure of the cross fin coil type air heat exchanger according to the third embodiment, in which the linear cuts (linear portions) a, b, c that extend along the lengthwise direction and have a predetermined length are provided at the upper ends and the lower ends of the slits 14 a , 14 b and the center of the slits 14 a.
  • this structure inhibits, as compared to the third embodiment, the operation in which the condensed water flows into the slits 14 a , 14 b without flowing around the upper end surfaces of the slits 14 a , 14 b after the condensed water generated on the fin surfaces concentrates at the cuts a at the upper side of the slits 14 a , 14 b , the condensed water is inhibited from flowing in from the top of the slits. Also, when forming the fin collars or the like, at least the upper cuts a do not interfere with the fin collars 15 in which the heat transfer tubes 12 are inserted.
  • FIG. 12 shows the structure of an air heat exchanger according to a tenth embodiment of the present invention suitable for an air conditioner indoor unit.
  • the parallel split type slits 14 a are employed as the cut-and-raised pieces 14 located in the vicinity of the side edges of the heat transfer fins 13 a , 13 b .
  • the linear cuts a at the upper end of the slits are omitted from the structure of the cross fin coil type air heat exchanger according to the sixth embodiment, in which the linear cuts (linear portions) a, b, c that extend along the lengthwise direction and have a predetermined length are provided at the upper ends and the lower ends of the slits 14 a , 14 b and at the center of the slits 14 a.
  • this structure inhibits, as compared to the sixth embodiment, the operation in which the condensed water flows into the slits 14 a , 14 b without flowing around the upper end surface of the slits 14 a , 14 b after the condensed water generated on the fin surfaces concentrates in the cuts a on the upper side of the slits 14 a , 14 b , the condensed water is inhibited from flowing in from the top of the slits. Also, when forming the fin collars or the like, at least the upper cuts a do not interfere with the fin collars 15 in which the heat transfer tubes 12 are inserted.
  • FIG. 13 shows the structure of an air heat exchanger according to an eleventh embodiment of the present invention suitable for an air conditioner indoor unit.
  • the integrated slits 14 b are employed as the cut-and-raised pieces 14 located at the center of the heat transfer fins 13 a , 13 b
  • the parallel split type slits 14 a are employed as the cut-and-raised pieces 14 located in the vicinity of the side edges of the heat transfer fins 13 a , 13 b .
  • All the cuts a, b, c except the cuts b at the center of the parallel split type slits 14 a extend diagonally to avoid the fin collars 15 in which the heat transfer tubes 12 are inserted in the structure of the cross fin coil type air heat exchanger according to the second embodiment, in which the linear cuts (linear portions) a, b, c that extend along the lengthwise direction and have a predetermined length are provided at the narrow angle portions of the upper ends and the lower ends of the slits 14 a , 14 b and at the center of the split portion of the slits 14 a.
  • the distance between the cuts a, b, c and the fin collars 15 is sufficient, the interference between the cuts and the mold is prevented.
  • the flexibility in the working of the fins is improved, and the molding accuracy is also improved.
  • the condensed water on the fin surfaces tends to concentrate in a lower portion of the center of the fin collars 15 .
  • the cuts a on the upper ends of the slits 14 a , 14 b are inclined, the condensed water is easily collected by the cuts a, and the condensed water easily flows into the slits 14 a , 14 b.
  • FIG. 14 shows the structure of an air heat exchanger according to a twelfth embodiment of the present invention suitable for an air conditioner indoor unit.
  • the integrated slits 14 b are employed as the cut-and-raised pieces 14 located at the center of the heat transfer fins 13 a , 13 b
  • the parallel split type slits 14 a are employed as the cut-and-raised pieces 14 located in the vicinity of the side edges of the heat transfer fins 13 a , 13 b .
  • All the cuts a, b, c except the cuts b at the center of the parallel split type slits 14 a extend diagonally to avoid the fin collars 15 in which the heat transfer tubes 12 are inserted in the structure of the cross fin coil type air heat exchanger according to the third embodiment, in which the linear cuts (linear portions) a, b, c that extend along the lengthwise direction and have a predetermined length are provided at the upper ends and the lower ends of the slits 14 a , 14 b and at the center of the slits 14 a.
  • the distance between the cuts a, b, c and the fin collars 15 is sufficient, the interference between the cuts and the mold is prevented.
  • the flexibility in the working of the fins is improved, and the molding accuracy is also improved.
  • the condensed water on the fin surfaces tends to concentrate in a lower portion of the center of the fin collars 15 .
  • the cuts a at the upper ends of the slits 14 a , 14 b are inclined, the condensed water is easily trapped by the cuts a, and the condensed water easily flows into the slits 14 a , 14 b.
  • FIG. 15 shows the structure of an air heat exchanger according to a thirteenth embodiment of the present invention suitable for an air conditioner indoor unit.
  • the integrated slits 14 b are employed as the cut-and-raised pieces 14 located at the center of the heat transfer fins 13 a , 13 b
  • the diagonal split type slits 14 a are employed as the cut-and-raised pieces 14 located in the vicinity of the side edges of the heat transfer fins 13 a , 13 b .
  • the cuts a at the upper ends of the slits are omitted in the structure of the cross fin coil type air heat exchanger according to the eleventh embodiment, in which, while the linear cuts (linear portions) a, b, c that extend along the lengthwise direction and have a predetermined length are provided at the upper ends and the lower ends of the slits 14 a , 14 b and at the center of the slits 14 a , all the cuts a, b, c except the cuts at the center of the split type slits 14 a extend diagonally to avoid the fin collars 15 .
  • this structure inhibits, as compared to the tenth embodiment, the operation in which the condensed water flows into the slits 14 a , 14 b without flowing around the upper end surfaces of the slits 14 a , 14 b after the condensed water generated on the fin surfaces concentrates in the upper cuts a of the slits 14 a , 14 b , the mold used in press molding the fin collars 15 does not interfere with the cuts a.
  • FIG. 16 shows the structure of an air heat exchanger according to a fourteenth embodiment of the present invention suitable for an air conditioner indoor unit.
  • the integrated slits 14 b are employed as the cut-and-raised pieces 14 located at the center of the heat transfer fins 13 a , 13 b
  • the parallel split type slits 14 a are employed as the cut-and-raised pieces 14 located in the vicinity of the side edges of the heat transfer fins 13 a , 13 b .
  • the cuts a at the upper end of the slits are omitted from the structure of the cross fin coil type air heat exchanger according to the twelfth embodiment, in which, while the linear cuts (linear portions) a, b, c that extend along the lengthwise direction and have a predetermined length are provided at the upper ends and the lower ends of the slits 14 a , 14 b and at the center of the slits 14 a , all the cuts a, b, c except the cuts at the center of the split type slits 14 a extend diagonally to avoid the fin collars 15 .
  • this structure inhibits, as compared to the eleventh embodiment, the operation in which the condensed water flows into the slits 14 a , 14 b without flowing around the upper end surfaces of the slits 14 a , 14 b after the condensed water generated on the fin surfaces concentrates in the upper cuts a of the slits 14 a , 14 b , the mold used for press molding the fin collars 15 does not interfere with the cuts a.
  • FIG. 17 shows the structure of an air heat exchanger according to a fifteenth embodiment of the present invention suitable for an air conditioner indoor unit.
  • the integrated slits 14 b are employed as the cut-and-raised pieces 14 located at the center of the heat transfer fins 13 a , 13 b
  • the diagonal split type slits 14 a are employed as the cut-and-raised pieces 14 located in the vicinity of the side edges of the heat transfer fins 13 a , 13 b .
  • Drainage ribs 16 a , 16 b are provided along the front edge of the front row of the fins 13 a and along the rear edge of the rear row of the fins 13 b in the structure of the cross fin coil type air heat exchanger according to the thirteenth embodiment, in which the linear cuts (linear portions) b, c that extend diagonally downward are provided only at the narrow angle portions at the lower ends of the slits 14 a , 14 b .
  • the ribs 16 a , 16 b have a recess on one of the fin surfaces and a projection on the other fin surface.
  • the linear cuts c that extend from the narrow angle portions at the lower ends of the slits 14 a , 14 b are connected or close to the ribs 16 a , 16 b.
  • ribs 16 a , 16 b for example, ribs having a semicircular cross-section shown in FIG. 18( a ), ribs having a triangular cross-section shown in FIG. 18( b ), or ribs having a rectangular cross-section shown in FIG. 18( c ) may be employed.
  • the interference between the mold used for press molding the fin collars and the cuts is eliminated, and the condensed water in the slits 14 a located in the vicinity of the side edges of the heat transfer fins 13 a , 13 b is smoothly discharged downward via grooves of the ribs 16 a , 16 b.
  • FIG. 19 shows the structure of an air heat exchanger according to a sixteenth embodiment of the present invention suitable for an air conditioner indoor unit.
  • the integrated slits 14 b are employed as the cut-and-raised pieces 14 located at the center of the heat transfer fins 13 a , 13 b
  • the parallel split type slits 14 a are employed as the cut-and-raised pieces 14 located in the vicinity of the side edges of the heat transfer fins 13 a , 13 b .
  • the drainage ribs 16 a , 16 b are provided along the front edge of the front row of the fin 13 a and along the rear edge of the rear row of the fin 13 b in the cross fin coil type air heat exchanger according to the fourteenth embodiment, in which the linear cuts (linear portions) c, b that extend diagonally downward to avoid the fin collars 15 and has a predetermined length are provided only at the narrow angle portions at the lower ends of the slits 14 a , 14 b .
  • the ribs 16 a , 16 b have a recess on one of the fin surfaces and a projection on the other fin surface.
  • the linear cuts that extend from the narrow angle portions at the lower ends of the slits 14 a , 14 b are connected or close to the ribs 16 a , 16 b.
  • the drainage ribs 16 a , 16 b for example, ribs having a semicircular cross-section shown in FIG. 18( a ), ribs having a triangular cross-section shown in FIG. 18( b ), or ribs having a rectangular cross-section shown in FIG. 18( c ) are employed.
  • the interference between the mold used for press molding the fin collars and the cuts is eliminated, and the condensed water in the slits 14 a located in the vicinity of the side edges of the heat transfer fins 13 a , 13 b is smoothly discharged downward via the grooves of the ribs 16 a , 16 b.
  • a minute space shown in FIG. 20( b ), a marked microgroove shown in FIG. 20( c ), a microslit shown in FIG. 20( d ), or a microlouver shown in FIG. 20( e ) may be employed as the linear portions a to c of the above embodiments.
  • minute gaps draw in the surrounding condensed water by capillary phenomenon, and the condensed water is smoothly discharged.
  • the heat exchangers of the above embodiments are optimal for, for example, the cross fin coil type air heat exchanger for an air conditioner indoor unit shown in FIGS. 21 and 23 . More specifically, the air conditioner indoor unit is easily manufactured with low costs that prevents adhesion of environmental suspended matter on the surfaces of the heat transfer fins, breeding of bacteria, and corrosion of the fins, improves drainage during cooling operation, improves the cooling performance, reduces ventilation resistance, and prevents spattering of water.
  • the heat exchangers of the present invention may be applied to other cooling apparatuses.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Geometry (AREA)
  • Air Filters, Heat-Exchange Apparatuses, And Housings Of Air-Conditioning Units (AREA)
  • Devices For Blowing Cold Air, Devices For Blowing Warm Air, And Means For Preventing Water Condensation In Air Conditioning Units (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
US12/527,364 2007-03-07 2008-03-06 Heat exchanger Abandoned US20100089562A1 (en)

Applications Claiming Priority (5)

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JP2007056648 2007-03-07
JP2007-056648 2007-03-07
JP2008050600A JP5417718B2 (ja) 2007-03-07 2008-02-29 熱交換器
JP2008-050600 2008-02-29
PCT/JP2008/054072 WO2008108437A1 (ja) 2007-03-07 2008-03-06 熱交換器

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US20100089562A1 true US20100089562A1 (en) 2010-04-15

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US (1) US20100089562A1 (ja)
EP (1) EP2119995B1 (ja)
JP (1) JP5417718B2 (ja)
KR (1) KR20090122229A (ja)
CN (1) CN101622512B (ja)
AU (1) AU2008221874B2 (ja)
WO (1) WO2008108437A1 (ja)

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EP2725311A3 (en) * 2012-10-29 2017-05-03 Samsung Electronics Co., Ltd Heat exchanger
DE102017120124A1 (de) * 2017-09-01 2019-03-07 Miele & Cie. Kg Lamellenrohrwärmeübertrager
US11236951B2 (en) * 2018-12-06 2022-02-01 Johnson Controls Technology Company Heat exchanger fin surface enhancement
US11774187B2 (en) * 2018-04-19 2023-10-03 Kyungdong Navien Co., Ltd. Heat transfer fin of fin-tube type heat exchanger

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JP5569409B2 (ja) * 2011-01-21 2014-08-13 ダイキン工業株式会社 熱交換器および空気調和機
CN103857974B (zh) * 2012-04-23 2018-03-16 松下电器产业株式会社 翅片管热交换器和其制造方法
SE538217C2 (sv) * 2012-11-07 2016-04-05 Andri Engineering Ab Värmeväxlare och ventilationsaggregat innefattande denna
CN104956175B (zh) * 2013-09-04 2017-12-22 松下知识产权经营株式会社 热交换器和使用其的冷却装置
JP5864030B1 (ja) * 2014-05-15 2016-02-17 三菱電機株式会社 熱交換器、及び、この熱交換器を備えた冷凍サイクル装置
DE102018131026A1 (de) 2018-12-05 2020-06-10 Volkswagen Aktiengesellschaft Wärmeübertrager für ein Fahrzeug, insbesondere ein Elektrofahrzeug
JP7159975B2 (ja) * 2019-05-24 2022-10-25 株式会社デンソー 熱交換器
JP7263970B2 (ja) * 2019-08-06 2023-04-25 株式会社デンソー 熱交換器

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US11774187B2 (en) * 2018-04-19 2023-10-03 Kyungdong Navien Co., Ltd. Heat transfer fin of fin-tube type heat exchanger
US11236951B2 (en) * 2018-12-06 2022-02-01 Johnson Controls Technology Company Heat exchanger fin surface enhancement

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WO2008108437A1 (ja) 2008-09-12
JP2008249320A (ja) 2008-10-16
AU2008221874B2 (en) 2011-01-20
EP2119995A4 (en) 2014-05-14
EP2119995A1 (en) 2009-11-18
KR20090122229A (ko) 2009-11-26
AU2008221874A1 (en) 2008-09-12
CN101622512A (zh) 2010-01-06
CN101622512B (zh) 2013-03-13
EP2119995B1 (en) 2018-05-02
JP5417718B2 (ja) 2014-02-19

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