US20090032224A1 - Heat exchanger - Google Patents

Heat exchanger Download PDF

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Publication number
US20090032224A1
US20090032224A1 US11/913,250 US91325006A US2009032224A1 US 20090032224 A1 US20090032224 A1 US 20090032224A1 US 91325006 A US91325006 A US 91325006A US 2009032224 A1 US2009032224 A1 US 2009032224A1
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United States
Prior art keywords
core pipe
pipe
brazing material
heat exchanger
portions
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
US11/913,250
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English (en)
Inventor
Mitsuharu Numata
Yutaka Shibata
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
Daikin Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Daikin Industries Ltd filed Critical Daikin Industries Ltd
Assigned to DAIKIN INDUSTRIES, LTD. reassignment DAIKIN INDUSTRIES, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: NUMATA, MITSUHARU, SHIBATA, YUTAKA
Publication of US20090032224A1 publication Critical patent/US20090032224A1/en
Abandoned legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/02—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being helically coiled
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/0008—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one medium being in heat conductive contact with the conduits for the other medium
    • F28D7/0016—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for one medium being in heat conductive contact with the conduits for the other medium the conduits for one medium or the conduits for both media being bent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
    • B23K1/0012—Brazing heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/02—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being helically coiled
    • F28D7/022—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being helically coiled the conduits of two or more media in heat-exchange relationship being helically coiled, the coils having a cylindrical configuration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/02—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being helically coiled
    • F28D7/024—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being helically coiled the conduits of only one medium being helically coiled tubes, the coils having a cylindrical configuration
    • 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
    • F28F1/02—Tubular elements of cross-section which is non-circular
    • 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
    • F28F1/02—Tubular elements of cross-section which is non-circular
    • F28F1/06—Tubular elements of cross-section which is non-circular crimped or corrugated in cross-section
    • 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
    • F28F1/42—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being both outside and inside the tubular element
    • F28F1/424—Means comprising outside portions integral with inside portions
    • F28F1/426—Means comprising outside portions integral with inside portions the outside portions and the inside portions forming parts of complementary shape, e.g. concave and convex
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/001—Turbines

Definitions

  • the present invention relates to a heat exchanger. More specifically, the present invention relates to a heat exchanger including a core pipe having projections that are formed on the inner surface thereof by pressing the outer surface of the core pipe, and a winding pipe that is wound around the outer surface of the core pipe.
  • Some heat exchangers used for air conditioners, water heaters, and the like are provided with a core pipe that forms a passage for a first fluid, a winding pipe that is wound around the outer surface of the core pipe and forms a passage for a second fluid, and a heat exchanger that exchanges heat between the first fluid and the second fluid.
  • a double pipe heat exchanger is used as a heat exchanger for a water heater such as a heat pump water heater.
  • Such a heat exchanger is formed by two pipes: a core pipe through which water flows and a winding pipe through which the refrigerant flows.
  • a core pipe having projections that are formed on the inner surface thereof by pressing the outer surface of the core pipe is used for a heat exchanger
  • such a core pipe has dents that are formed on the outer surface thereof at portions corresponding to the projections on the inner surface.
  • a winding pipe is wound around the core pipe and then the core pipe is spirally wound into an oval shape
  • the wall thickness of projecting portions of the core pipe may be made thinner in a process of forming the projections than the wall thickness of non-projecting portions of the core pipe, which may consequently reduce the strength of the projecting portions.
  • an object of the present invention is to overcome the above problem and to improve the heat transfer performance of a heat exchanger including a core pipe having projections that are formed on the inner surface thereof by pressing the outer surface of the core pipe, and a winding pipe that is wound around the outer surface of the core pipe.
  • a heat exchanger is a heat exchanger that exchanges heat between a first fluid and a second fluid, the heat exchanger including a core pipe, a winding pipe, and a brazing material.
  • the core pipe forms a passage of a first fluid
  • the core pipe has projections that are formed on the inner surface thereof by pressing the outer surface of the core pipe and also has dented portions on the outer surface thereof.
  • the winding pipe forms a passage of a second fluid, and the winding pipe is wound around the outer surface of the core pipe.
  • the brazing material is poured into the dented portions located in the vicinity of the winding pipe.
  • the core pipe having the projections on the inner surface thereof is used. Because of the projections, the heat transfer performance of the core pipe is improved. At the same time, dents are formed on the outer surface of the core pipe at portions corresponding to the projections that are formed on the inner surface of the core pipe.
  • the brazing material is poured into the dented portions located in the vicinity of the winding pipe. In this way, when the brazing material is poured into the dented portions, the dented portions formed on the outer surface of the core pipe are filled with the brazing material, which consequently eliminates a poor contact between the core pipe and the winding pipe.
  • the brazing material when the brazing material is poured into the dented portions located in the vicinity of the winding pipe, these dented portions are filled with the brazing material. Therefore, even if the wall thickness of projecting portions of the core pipe is made thinner in the process of forming the projections than the wall thickness of non-projecting portions of the core pipe, the core pipe thickness can be reinforced, and thus the reduction in strength of the projecting portions can be prevented.
  • a heat exchanger according to a second aspect of the present invention is the heat exchanger described above, in which the brazing material is a brazing material in a paste form, which is applied to the dented portions of the core pipe in advance and then melted and bonded thereto.
  • the brazing material in a paste form is applied to the dented portions of the core pipe in advance, and then brazing is carried out, for example, in a furnace.
  • the brazing material melted by the heat is reliably poured into the dented portions and bonded thereto after being cooled down.
  • the dented portions formed on the outer surface of the core pipe can be reliably filled with the brazing material, which consequently eliminates a poor contact between the core pipe and the winding pipe.
  • the wall thickness of projecting portions of the core pipe is made thinner in the process of forming the projections than the wall thickness of non-projecting portions of the core pipe, the dented portions formed on the outer surface of the core pipe are filled with the brazing material, and the core pipe thickness can be reinforced, thus the reduction in strength of the projecting portions can be prevented.
  • a heat exchanger according to a third aspect of the present invention is the heat exchanger described above, in which the brazing material is a brazing material in a linear form, which is disposed between the core pipe and the winding pipe in advance and then is melted and bonded thereto.
  • the brazing material is disposed between the core pipe and the winding pipe in advance, and then brazing is carried out, for example, in a furnace.
  • the dented portions work in a similar way as a capillary tube.
  • the brazing material melted by the heat is poured into the dented portions due to the capillary force.
  • a complicated process of applying the brazing material for each dented portion can be avoided, which results in improving the brazing efficiency.
  • the brazing material that was melted by the heat is reliably poured into the dented portions and bonded thereto after being cooled down.
  • the dented portions formed on the outer surface of the core pipe can be reliably filled with the brazing material, which consequently eliminates a poor contact between the core pipe and the winding pipe.
  • the dented portions formed on the outer surface of the core pipe are filled with the brazing material, so that the core pipe thickness can be reinforced.
  • a heat exchanger according to a fourth aspect of the present invention is the heat exchanger described above, wherein the brazing material is a brazing material in a linear form, which is disposed on the winding pipe wound around the core pipe and then melted and bonded thereto.
  • the brazing material is disposed on the winding pipe wound around the core pipe, and then brazing is carried out, for example, in a furnace.
  • the core pipe is provided with helically arranged projections and the winding pipe is also helically wound around the outer surface of the core pipe, it will be difficult to dispose a brazing material between the core pipe and the winding pipe in advance. Therefore, the brazing material in a linear shape is first disposed on the winding pipe wound around the core pipe, and then brazing is carried out. Also in this case, the brazing material that is melted by the heat will be poured into the dented portions due to the capillary force.
  • the brazing material that was melted by the heat is reliably poured into the dented portions and bonded thereto after being cooled down.
  • the dented portions formed on the outer surface of the core pipe can be reliably filled with the brazing material, which consequently eliminates a poor contact between the core pipe and the winding pipe.
  • the wall thickness of projecting portions of the core pipe is made thinner in the process of forming the projections than the wall thickness of non-projecting portions of the core pipe, the dented portions formed on the outer surface of the core pipe are filled with the brazing material, so that the core pipe thickness can be reinforced.
  • a heat exchanger according to a fifth aspect of the present invention is the heat exchanger described above, in which the brazing material is a brazing material in a paste form, which is applied to the winding pipe wound around the core pipe in advance and then melted and bonded thereto.
  • the brazing material in a paste form is applied to the winding pipe wound around the core pipe, and then brazing is carried out, for example, in a furnace. As a result, the same effect as in the fourth aspect can be obtained.
  • the core pipe having the projections on the inner surface thereof is used. Because of the projections, the heat transfer performance of the core pipe is improved. At the same time, dents are formed on the outer surface of the core pipe at portions corresponding to the projections that are formed on the inner surface of the core pipe. In order to eliminate a poor contact between the core pipe and the winding pipe when the winding pipe is wound around these dented portions, a brazing material is poured into the dented portions located in the vicinity of the winding pipe.
  • the dented portions formed on the outer surface of the core pipe can be reliably filled with the brazing material, which consequently eliminates a poor contact between the core pipe and the winding pipe.
  • the wall thickness of projecting portions of the core pipe is made thinner in the process of forming the projections than the wall thickness of non-projecting portions of the core pipe, the dented portions formed on the outer surface of the core pipe are filled with the brazing material, and the core pipe thickness can be reinforced, thus the reduction in strength of the projecting portions can be prevented.
  • the brazing material in a paste form is applied to the dented portions of the core pipe in advance, and then brazing is carried out, for example, in a furnace.
  • the brazing material melted by the heat is reliably poured into the dented portions and bonded thereto after being cooled down.
  • the dented portions formed on the outer surface of the core pipe can be reliably filled with the brazing material, which consequently eliminates a poor contact between the core pipe an d the winding pipe.
  • the dented portions formed on the outer surface of the core pipe are filled with the brazing material, and the core pipe thickness can be reinforced.
  • the brazing material is disposed between the core pipe and the winding pipe in advance, and then brazing is carried out, for example, in a furnace.
  • the dented portions work in a similar way as a capillary tube.
  • the brazing material melted by the heat is poured into the dented portions due to the capillary force.
  • a complicated process of applying the brazing material for each dented portion can be avoided, which results in improving the brazing efficiency.
  • the brazing material that was melted by the heat is reliably poured into the dented portions and bonded thereto after being cooled down.
  • the dented portions formed on the outer surface of the core pipe can be reliably filled with the brazing material, which consequently eliminates a poor contact between the core pipe and the winding pipe.
  • the dented portions formed on the outer surface of the core pipe are filled with the brazing material, so that the core pipe thickness can be reinforced.
  • the brazing material is disposed on the winding pipe wound around the core pipe, and then brazing is carried out, for example, in a furnace.
  • the core pipe is provided with helically arranged projections and the winding pipe is also helically wound around the outer surface of the core pipe, it will be difficult to dispose a brazing material between the core pipe and the winding pipe in advance. Therefore, the brazing material in a linear shape is first disposed on the winding pipe wound around the core pipe, and then brazing is carried out. Also in this case, the brazing material that is melted by the heat will be poured into the dented portions due to the capillary force.
  • the brazing material that was melted by the heat is reliably poured into the dented portions and bonded thereto after being cooled down.
  • the dented portions formed on the outer surface of the core pipe can be reliably filled with the brazing material, which consequently eliminates a poor contact between the core pipe and the winding pipe.
  • the wall thickness of projecting portions of the core pipe is made thinner in the process of forming the projections than the wall thickness of non-projecting portions of the core pipe, the dented portions formed on the outer surface of the core pipe are filled with the brazing material, so that the core pipe thickness can be reinforced.
  • the brazing material in a paste form is applied to the winding pipe wound around the core pipe, and then brazing is carried out, for example, in a furnace.
  • the dented portions formed on the outer surface of the core pipe can be reliably filled with the brazing material, which consequently eliminates a poor contact between the core pipe and the winding pipe.
  • the wall thickness of projecting portions of the core pipe is made thinner in the process of forming the projections than the wall thickness of non-projecting portions of the core pipe, the dented portions formed on the outer surface of the core pipe are filled with the brazing material, so that the core pipe thickness can be reinforced.
  • FIG. 1 is a schematic diagram of a heat pump water heater in accordance with the present invention.
  • FIG. 2 is a schematic diagram of a water heat exchanger in accordance with the present invention.
  • FIG. 3 is a plan view of a core pipe in accordance with the present invention.
  • FIG. 4 is an enlarged view of section A-A in FIG. 3 in accordance with the present invention.
  • FIG. 5 illustrates a brazing material that is melted and bonded according to a first embodiment in accordance with the present invention.
  • FIG. 6 illustrates a brazing material that is melted and bonded to according a second embodiment in accordance with the present invention.
  • FIG. 7 illustrates a brazing material that is melted and bonded to according a third embodiment in accordance with the present invention.
  • FIG. 8 illustrates a brazing material that is melted and bonded to according a fourth embodiment in accordance with the present invention.
  • FIG. 1 is a schematic diagram of a heat pump water heater in which a heat exchanger of the present invention is employed.
  • the heat pump water heater shown in FIG. 1 water is heated in a single pass from about 10° C. to about 90° C. over a long period of time in order to efficiently use low-cost nighttime electric power.
  • the heat pump water heater includes a hot water supply unit 1 , and a heat pump unit 2 .
  • the following are successively coupled in the hot water supply unit 1 : a service water pipe 11 , a hot water storage tank 12 , a water circulation pump 13 , a water supply pipe 3 , a core pipe 31 that constitutes a water heat exchanger 30 , a hot water pipe 16 , a mixing valve 17 , and a hot water supply pipe 18 .
  • service water is supplied from the water supply pipe 11 to the hot water storage tank 12 .
  • Low temperature water is supplied by the water circulation pump 13 from the bottom part of the hot water storage tank 12 to the core pipe 31 of the water heat exchanger 30 , and heated.
  • the heated hot water flows into the upper part of the hot water storage tank 12 .
  • the high temperature hot water that exits from the upper part of the hot water storage tank 12 via the hot water pipe 16 is mixed with the cold water of a mixed water pipe 19 by the mixing valve 17 .
  • This mixing valve 17 regulates the temperature of the supplied hot water, which is supplied to the user by the hot water supply pipe 18 .
  • the heat pump unit 2 is provided with a refrigerant circulating circuit that includes a compressor 21 , the water heat exchanger 30 , an expansion valve 23 , and an air heat exchanger 24 , which are connected sequentially by a winding pipe 32 .
  • the refrigerant is compressed to a high pressure by the compressor 21 , and is then sent to the water heat exchanger 30 .
  • the refrigerant whose heat was exchanged in the water heat exchanger 30 passes through the expansion valve 23 , and is supplied to the air heat exchanger 24 .
  • the refrigerant absorbs heat from the surroundings, and then circulates back to the compressor 21 .
  • FIG. 2 is a schematic diagram of the water heat exchanger 30 in the heat pump water heater.
  • the water heat exchanger 30 includes the core pipe 31 and the winding pipe 32 .
  • the core pipe 31 is spirally formed into an oval shape in the same plane, and forms a water passage W.
  • the winding pipe 32 is helically wound around the outer circumference of the core 31 , and forms a refrigerant passage R.
  • the outer circumferential side of the spiral of the core pipe 31 is a water inlet 311
  • the center side of the spiral of the heat transfer pipe 31 is a water outlet 312 .
  • the refrigerant inside the winding pipe 32 flows into the refrigerant inlet 322 from the A 22 direction, and radiates heat. Subsequently, the refrigerant flows out of the refrigerant outlet 321 in the A 21 direction.
  • the service water supplied into the water inlet 311 from the A 11 direction is heated by this heat, turns into hot water, and flows out of the water outlet 312 in the A 12 direction.
  • this embodiment uses the core pipe 31 having an inside diameter D of 8 mm in which projections each having a height H 1 of 1 mm are provided vertically symmetric at a 20 mm pitch in the pipe axial direction on the pipe inner surface.
  • FIG. 3 illustrates only projections 313 provided upward when viewed from the paper surface direction.
  • flat surface parts 31 a that are not provided with the projections exist on the inner surface of the core pipe 31 . Accordingly, the heat transfer coefficient is improved because of the projections 313 provided inside the pipe, which consequently improves the overall performance of the heat exchanger.
  • FIG. 4 is an enlarged view of cross section A-A of one of the projections 313 provided inside the core pipe 31 in FIG. 3 .
  • the core pipe 31 when the wall thickness is compared between the flat surface parts 31 a in which the projections are not formed and portions in which the projections 313 are formed, the wall thickness of the portions in which the projections 313 are formed is thinner. At such portions of the core pipe, where the wall thickness is thinner, the strength of the pipe wall may be reduced.
  • a brazing material 33 in a linear form is first disposed on the winding pipes 32 , 32 , and then brazing is carried out in a furnace (not shown).
  • the plurality of winding pipes 32 , 32 are helically wound around the core pipe 31 , and the core pipe 31 is provided with the projections 313 that are helically arranged. Consequently, it will be difficult to dispose a brazing material between the core pipe and the winding pipe in advance.
  • the brazing material 33 in a linear form is first disposed on the plurality of winding pipes 32 , 32 wound around the core pipe 31 , and then brazing is carried out.
  • the brazing material 33 melted by the heat is poured into dented portions 314 due to the capillary force. Consequently, with the heat exchanger in which the plurality of winding pipes 32 , 32 are helically wound around the core pipe 31 , it is possible to improve the brazing efficiency.
  • the brazing material melted by the heat is reliably poured into the dented portions and bonded thereto after being cooled down.
  • the dented portions formed on the outer surface of the core pipe can be reliably filled with the brazing material, which consequently eliminates a poor contact between the core pipe and the winding pipe.
  • the wall thickness of projecting portions of the core pipe is made thinner in the process of forming the projections than the wall thickness of non-projecting portions of the core pipe, the dented portions formed on the outer surface of the core pipe are filled with the brazing material, and the core pipe thickness can be reinforced, thus the reduction in strength of the projecting portions can be prevented.
  • a brazing material 43 in a paste form which is contained in a container 45 , is applied to the winding pipes 42 , 42 , and then brazing is carried out in a furnace (not shown).
  • the brazing material 43 melted by the heat will be poured into dented portions 414 due to the capillary force. Consequently, with the heat exchanger in which the plurality of winding pipes 42 , 42 are helically wound around the core pipe 41 , it is possible to improve the brazing efficiency.
  • the brazing material melted by the heat is reliably poured into the dented portions and bonded thereto after being cooled down.
  • the dented portions formed on the outer surface of the core pipe can be reliably filled with the brazing material, which consequently eliminates a poor contact between the core pipe and the winding pipe.
  • the wall thickness of projecting portions of the core pipe is made thinner in the process of forming the projections than the wall thickness of non-projecting portions of the core pipe, the dented portions formed on the outer surface of the core pipe are filled with the brazing material, and the core pipe thickness can be reinforced, thus the reduction in strength of the projecting portions can be prevented.
  • a heat transfer tube 52 that forms a refrigerant passage R is not a winding pipe but a straight pipe.
  • a straight pipe 52 that forms the refrigerant passage R is disposed on the outer surface of a core pipe 51 that forms a water passage W.
  • a brazing material 53 in a paste form is applied in advance to dented portions 514 formed on the outer surface of the core pipe 51 , and a straight pipe 52 is disposed on the core pipe 51 , then brazing is carried out in a furnace (not shown). In this way, the brazing material 53 melted by the heat is reliably poured into the dented portions 514 and bonded thereto after being cooled down.
  • the dented portions 514 formed on the outer surface of the core pipe 51 can be reliably filled with the brazing material 53 , which consequently eliminates a poor contact between the core pipe 51 and the pipe 52 .
  • the dented portions 514 formed on the outer surface of the core pipe 51 are filled with the brazing material 53 , so that the core pipe thickness can be reinforced.
  • the reduction in strength of the portions with the projections 513 can be prevented.
  • a heat transfer tube 61 that forms a refrigerant passage R is not a winding pipe but a straight pipe.
  • a straight pipe 61 that forms the refrigerant passage R is disposed on the outer surface of the core pipe 61 that forms a water passage W.
  • a brazing material 63 is disposed between a core pipe 61 and the straight pipe 61 in advance, and then brazing is carried out in a furnace (not shown).
  • Dented portions 614 work in a similar way as a capillary tube. The brazing material 63 melted by the heat is poured into the dented portions 614 due to the capillary force.
  • the brazing material 63 melted by the heat is reliably poured into the dented portions 614 and bonded thereto after being cooled down.
  • the dented portions 614 formed on the outer surface of the core pipe 61 can be reliably filled with the brazing material 63 , which consequently eliminates a poor contact between the core pipe 61 and the straight pipe 62 .

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Geometry (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
US11/913,250 2005-05-16 2006-04-28 Heat exchanger Abandoned US20090032224A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2005142433A JP3953075B2 (ja) 2005-05-16 2005-05-16 熱交換器
JP2005-142433 2005-05-16
PCT/JP2006/308974 WO2006123536A1 (ja) 2005-05-16 2006-04-28 熱交換器

Publications (1)

Publication Number Publication Date
US20090032224A1 true US20090032224A1 (en) 2009-02-05

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US11/913,250 Abandoned US20090032224A1 (en) 2005-05-16 2006-04-28 Heat exchanger

Country Status (7)

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US (1) US20090032224A1 (ko)
EP (1) EP1895257A4 (ko)
JP (1) JP3953075B2 (ko)
KR (1) KR20080011424A (ko)
CN (1) CN101175966A (ko)
AU (1) AU2006249166B2 (ko)
WO (1) WO2006123536A1 (ko)

Cited By (5)

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US20090071639A1 (en) * 2005-05-16 2009-03-19 Daikin Industries , Ltd. Heat exchanger
US20130319635A1 (en) * 2011-02-10 2013-12-05 Mitsubishi Electric Corporation Cooling device and power conversion device
US20150083787A1 (en) * 2013-09-20 2015-03-26 Alstom Technology Ltd Method for fixing heat resistant component on a surface of a heat exposed component
US20160025341A1 (en) * 2014-07-25 2016-01-28 General Electric Company Liner assembly and method of turbulator fabrication
EP3660435A4 (en) * 2017-07-24 2020-08-26 Mitsubishi Electric Corporation HEAT EXCHANGER AND REFRIGERATION CYCLE DEVICE

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KR20080011424A (ko) 2008-02-04
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