US20240003636A1 - Heat exchanger and refrigeration cycle apparatus including the same - Google Patents

Heat exchanger and refrigeration cycle apparatus including the same Download PDF

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Publication number
US20240003636A1
US20240003636A1 US18/254,794 US202118254794A US2024003636A1 US 20240003636 A1 US20240003636 A1 US 20240003636A1 US 202118254794 A US202118254794 A US 202118254794A US 2024003636 A1 US2024003636 A1 US 2024003636A1
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United States
Prior art keywords
side portion
heat exchanger
flow path
opening end
transfer tube
Prior art date
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Abandoned
Application number
US18/254,794
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English (en)
Inventor
Atsushi Morita
Tsuyoshi Maeda
Shin Nakamura
Akira YATSUYANAGI
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Assigned to MITSUBISHI ELECTRIC CORPORATION reassignment MITSUBISHI ELECTRIC CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MAEDA, TSUYOSHI, MORITA, ATSUSHI, NAKAMURA, SHIN, YATSUYANAGI, Akira
Publication of US20240003636A1 publication Critical patent/US20240003636A1/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
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/04—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits
    • F28D1/053—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight
    • F28D1/0535—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with tubular conduits the conduits being straight the conduits having a non-circular cross-section
    • F28D1/05366—Assemblies of conduits connected to common headers, e.g. core type radiators
    • F28D1/05383—Assemblies of conduits connected to common headers, e.g. core type radiators with multiple rows of conduits or with multi-channel conduits
    • 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
    • F28F1/04—Tubular elements of cross-section which is non-circular polygonal, e.g. rectangular
    • 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
    • F28F1/022—Tubular elements of cross-section which is non-circular with multiple channels
    • 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
    • F28F1/025—Tubular elements of cross-section which is non-circular with variable shape, e.g. with modified tube ends, with different geometrical features
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/04—Arrangements for sealing elements into header boxes or end plates
    • F28F9/16—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling
    • F28F9/18—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling by welding
    • F28F9/182—Arrangements for sealing elements into header boxes or end plates by permanent joints, e.g. by rolling by welding the heat-exchange conduits having ends with a particular shape, e.g. deformed; the heat-exchange conduits or end plates having supplementary joining means, e.g. abutments
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2255/00—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes
    • F28F2255/16—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes extruded

Definitions

  • the present disclosure relates to a heat exchanger and a refrigeration cycle apparatus including the same.
  • An exemplary embodiment of a heat exchanger used in an air conditioner is a heat exchanger applying a flat heat transfer tube having a flat shape and provided with a plurality of flow paths through which refrigerant flows.
  • this type of heat exchanger When this type of heat exchanger is operated to function as an evaporator, it requires a larger amount of refrigerant to flow through a flow path located on the windward side in order to improve the heat transfer performance.
  • PTL 1 proposes a heat exchanger including a flat heat transfer tube in which a flow path located on the windward side is broader than a flow path located on the leeward side.
  • the flat heat transfer tube is manufactured, for example, by extrusion molding of a material such as aluminum.
  • a material such as aluminum.
  • its cross-sectional shape becomes asymmetrical, which may make it difficult to manufacture a desired flat heat transfer tube.
  • the heat exchanger needs to be improved in manufacturability while ensuring heat transfer performance.
  • the present disclosure has been made as part of such a development.
  • One object of the present disclosure is to provide a heat exchanger improved in manufacturability while ensuring heat transfer performance, and another object thereof is to provide a refrigeration cycle apparatus to which such a heat exchanger is applied.
  • a heat exchanger includes a flat heat transfer tube having a flat shape, a header, and a heat dissipation fin.
  • the flat heat transfer tube having a flat shape has a first side portion and a second side portion spaced from each other by a width in a first direction, and extends in a second direction crossing the first direction.
  • the flat heat transfer tube has a plurality of flow paths each extending in the second direction, the flow paths being spaced from each other in the first direction.
  • the header has an opening to which the flat heat transfer tube is connected.
  • the flat heat transfer tube includes a main body and a connecting portion. The main body is attached to the heat dissipation fin.
  • the connecting portion has an opening end face at which each of the flow paths opens.
  • each of the flow paths has a first flow path cross-sectional area.
  • the first side portion is tapered toward the opening end face to be reduced in the width.
  • a first opening end of a first flow path located closest to the tapered first side portion among the flow paths has a second flow path cross-sectional area smaller than the first flow path cross-sectional area.
  • a refrigeration cycle apparatus includes the heat exchanger.
  • the flat heat transfer tube includes a main body and a connecting portion.
  • the flat heat transfer tube has a plurality of flow paths spaced from each other.
  • the flat heat transfer tube has a first side portion and a second side portion spaced from each other by a width.
  • the connecting portion connected to the opening of the header has an opening end face at which each of the flow paths opens.
  • the first side portion is tapered toward the opening end face to be reduced in width.
  • the first opening end of the first flow path located closest to the first side portion has a second flow path cross-sectional area smaller than the first flow path cross-sectional area. This allows a larger amount of refrigerant to flow through the flow path located in the region under high thermal load, with the result that the heat transfer performance can be ensured.
  • the heat exchanger is provided, so that the manufacturability can be improved while ensuring the heat transfer performance.
  • FIG. 1 is a diagram showing a refrigerant circuit of a refrigeration cycle apparatus including an outdoor heat exchanger according to each embodiment.
  • FIG. 2 is a perspective view showing an example of the outdoor heat exchanger according to each embodiment.
  • FIG. 3 is a partially cross-sectional top view showing a structure of a portion where a flat heat transfer tube is connected to a header in an outdoor heat exchanger according to a first embodiment.
  • FIG. 4 is a cross-sectional view taken along a cross-sectional line IV-IV shown in FIG. 3 in the first embodiment.
  • FIG. 5 is a front view showing an opening end face in a connecting portion of the flat heat transfer tube in the first embodiment.
  • FIG. 6 shows an example of a flowchart illustrating a method of manufacturing an outdoor heat exchanger in the first embodiment.
  • FIG. 7 is a partial top view showing one step of the method of manufacturing the outdoor heat exchanger in the first embodiment.
  • FIG. 8 is a partially cross-sectional top view showing a step performed after the step shown in FIG. 7 in the first embodiment.
  • FIG. 9 is a diagram for illustrating functions and effects of the outdoor heat exchanger in the first embodiment.
  • FIG. 10 is a partially cross-sectional top view showing a structure of a portion where a flat heat transfer tube is connected to a header in an outdoor heat exchanger according to a second embodiment.
  • FIG. 11 is a front view showing an opening end face in a connecting portion of the flat heat transfer tube in the second embodiment.
  • FIG. 12 is a partial top view showing one step of a method of manufacturing an outdoor heat exchanger in the second embodiment.
  • FIG. 13 is a partially cross-sectional top view showing a structure of a portion where a flat heat transfer tube is connected to a header in an outdoor heat exchanger according to a third embodiment.
  • FIG. 14 is a front view showing an opening end face in a connecting portion of the flat heat transfer tube in the third embodiment.
  • FIG. 15 is a partial top view showing one step of a method of manufacturing an outdoor heat exchanger in the third embodiment.
  • FIG. 16 is a partially cross-sectional partial top view showing a step performed after the step shown in FIG. 15 in the third embodiment.
  • FIG. 17 is a partially cross-sectional top view showing a structure of a portion where a flat heat transfer tube is connected to a header in an outdoor heat exchanger according to a fourth embodiment.
  • FIG. 18 is a front view showing an opening end face in a connecting portion of the flat heat transfer tube in the fourth embodiment.
  • FIG. 19 is a partial top view showing one step of a method of manufacturing an outdoor heat exchanger in the fourth embodiment.
  • FIG. 20 is a perspective view showing another example of the outdoor heat exchanger according to each embodiment.
  • a refrigeration cycle apparatus 1 includes a compressor 3 , an indoor heat exchanger 5 , a fan 7 , an expansion valve 9 , an outdoor heat exchanger 11 , a propeller fan 13 , a four-way valve 15 , and a refrigerant pipe 17 that connects these components.
  • the structure of outdoor heat exchanger 11 will be described in detail in each embodiment.
  • the following describes the operation of the above-mentioned refrigeration cycle apparatus 1 in the case of a heating operation.
  • the flow of refrigerant during a heating operation is indicated by a solid line.
  • high-temperature and high-pressure gas refrigerant is discharged from compressor 3 .
  • the discharged high-temperature and high-pressure gas refrigerant (a single phase) flows through four-way valve 15 into indoor heat exchanger 5 .
  • Indoor heat exchanger 5 exchanges heat between the gas refrigerant flowing thereinto and the air fed thereinto by fan 7 .
  • the high-temperature and high-pressure gas refrigerant is condensed into high-pressure liquid refrigerant (a single phase).
  • the heat-exchanged air is fed out from indoor heat exchanger 5 into an indoor side to heat the indoor side.
  • the high-pressure liquid refrigerant fed out from indoor heat exchanger 5 is converted by expansion valve 9 into refrigerant in a two-phase state including low-pressure gas refrigerant and liquid refrigerant.
  • the refrigerant in the two-phase state flows into outdoor heat exchanger 11 .
  • Outdoor heat exchanger 11 functions as an evaporator. Outdoor heat exchanger 11 exchanges heat between the refrigerant in the two-phase state flowing thereinto and the air fed thereinto by propeller fan 13 . From the refrigerant in the two-phase state, liquid refrigerant evaporates to become low-pressure gas refrigerant (a single phase). At this time, a larger amount of refrigerant flows through the refrigerant flow path located on the windward side than through the refrigerant flow path located on the leeward side. The low-pressure gas refrigerant is fed out from outdoor heat exchanger 11 .
  • the low-pressure gas refrigerant fed out from outdoor heat exchanger 11 flows into compressor 3 through four-way valve 15 .
  • the low-pressure gas refrigerant having flowed into compressor 3 is compressed into high-temperature and high-pressure gas refrigerant, which is then discharged from compressor 3 again. This cycle is subsequently repeated.
  • the high-pressure liquid refrigerant fed out from outdoor heat exchanger 11 is converted by expansion valve 9 into refrigerant in a two-phase state including low-pressure gas refrigerant and liquid refrigerant.
  • the refrigerant in the two-phase state flows into indoor heat exchanger 5 .
  • Indoor heat exchanger 5 exchanges heat between the refrigerant in the two-phase state flowing thereinto and the air fed thereinto by fan 7 .
  • liquid refrigerant evaporates to become low-pressure gas refrigerant (a single phase).
  • the heat-exchanged air is fed out from indoor heat exchanger 5 into an indoor side to cool the indoor side.
  • the low-pressure gas refrigerant fed out from indoor heat exchanger 5 flows into compressor 3 through four-way valve 15 .
  • the low-pressure gas refrigerant having flowed into compressor 3 is compressed into high-temperature and high-pressure gas refrigerant, which is then discharged from compressor 3 again. This cycle is subsequently repeated.
  • the structure of outdoor heat exchanger 11 according to each embodiment will be described below. Each embodiment will be described with reference to an X-axis and a Y-axis for convenience of explanation.
  • a housing 10 of an outdoor unit accommodates: outdoor heat exchanger 11 including a flat heat transfer tube 21 and a heat dissipation fin 41 ; and a header 31 .
  • outdoor heat exchanger 11 including a flat heat transfer tube 21 and a heat dissipation fin 41 ; and a header 31 .
  • housing 10 also accommodates propeller fan 13 , compressor 3 (not shown), and the like. By driving propeller fan 13 (not shown), air flows inside housing 10 in the direction indicated by an arrow Y 1 .
  • flat heat transfer tube 21 in outdoor heat exchanger 11 includes a main body 23 and a connecting portion 25 .
  • Flat heat transfer tube 21 has a width in a Y-axis direction as the first direction and extends in an X-axis direction as the second direction.
  • a plurality of flow paths 27 each extending in the X-axis direction are spaced from each other in the Y-axis direction (see FIG. 4 ).
  • Flat heat transfer tube 21 has a first side portion 29 a and a second side portion 29 b that are spaced from each other by a width.
  • first side portion 29 a is located on the leeward side while second side portion 29 b is located on the windward side.
  • Heat dissipation fin 41 is attached to main body 23 .
  • Connecting portion 25 has an opening end face 26 at which an opening end 28 (see FIG. 5 ) of each of the plurality of flow paths 27 is located. In this case, opening end face 26 is located to extend in the Y-axis direction.
  • Connecting portion 25 is connected to header 31 while being inserted into an opening 33 provided in header 31 .
  • First side portion 29 a and second side portion 29 b in connecting portion 25 are in contact with an opening inner wall surface 34 of opening 33 .
  • each of the plurality of flow paths 27 has a first flow path cross-sectional area Si. As will be described later, when flat heat transfer tube 21 is manufactured, a molded body to be formed as main body 23 is first manufactured.
  • connecting portion 25 is processed (shrunk) so as to shrink flat heat transfer tube 21 in a width direction (the Y-axis direction).
  • first side portion 29 a is tapered toward opening end face 26 to be reduced in width.
  • a first opening end 28 a of a first flow path 27 a located closest to first side portion 29 a among flow paths 27 arranged in the Y-axis direction is narrowed in the Y-axis direction so as to conform to the tapered first side portion 29 a.
  • first opening end 28 a of first flow path 27 a has a second flow path cross-sectional area S 2 smaller than first flow path cross-sectional area S 1 of opening end 28 of each of other flow paths 27 .
  • first opening end 28 a of first flow path 27 a located closest to first side portion 29 a has second flow path cross-sectional area S 2 smaller than first flow path cross-sectional area S 1 of opening end 28 of each of other flow paths 27 .
  • Outdoor heat exchanger 11 according to the first embodiment is configured as described above.
  • step Ti a material to be formed as a flat heat transfer tube is first prepared. Then, in step T 2 , the material is introduced into an extruder. Then, in step T 3 , the material introduced into the extruder is extruded to thereby produce molded body 20 (see FIG. 7 ) to be formed as a flat heat transfer tube.
  • molded body 20 (see FIG. 7 ) is formed to have a cross-sectional shape that is line-symmetric with respect to the center line in the width direction as shown by the cross-sectional shape of main body 23 (see FIG. 4 ). This allows uniform extrusion of the material, for example, to make it possible to produce a molded body with no void.
  • step T 4 molded body 20 is cut and shrunk (see FIG. 7 ). As shown in FIG. 7 , in this case, molded body 20 is cut in the Y-axis direction. At the cut surface of this cut molded body 20 , each of flow paths 27 (see FIG. 4 and the like) opens as opening end face 26 .
  • molded body 20 is cut as well as shrunk. Specifically, pressure is applied (see an arrow P 1 ), for example, with a plate member (not shown) or the like to first side portion 29 a of molded body 20 so as to taper this first side portion 29 a such that molded body 20 is reduced in width toward opening end face 26 .
  • first opening end 28 a of first flow path 27 a located closest to first side portion 29 a among the plurality of flow paths 27 is narrowed in the Y-axis direction (see FIG. 5 ).
  • first opening end 28 a of first flow path 27 a located closest to first side portion 29 a is to have second flow path cross-sectional area S 2 smaller than first flow path cross-sectional area S 1 of opening end 28 of each of other flow paths 27 .
  • flat heat transfer tube 21 including main body 23 and connecting portion 25 is completed (step T 5 ).
  • step T 6 flat heat transfer tube 21 is connected to header 31 (see FIG. 8 ).
  • connecting portion 25 of flat heat transfer tube 21 is inserted into opening 33 provided in header 31 as shown by an arrow P 3 , and first side portion 29 a and second side portion 29 b are brought into contact with opening inner wall surface 34 of opening 33 .
  • first side portion 29 a is tapered, connecting portion 25 is easily inserted into opening 33 of header 31 . Further, the length of the portion of connecting portion 25 that is inserted into header 31 is uniquely defined, so that connecting portion 25 can be prevented, for example, from being inserted more than necessary into opening 33 of header 31 . Thus, attachment of flat heat transfer tube 21 onto header 31 ends, and the main part of outdoor heat exchanger 11 is completed.
  • a molded body having a cross-sectional shape that is line-symmetric with respect to the center line in the width direction is first molded as shown by the cross-sectional shape of main body 23 (see FIG. 4 ).
  • This allows uniform extrusion of the material, for example, to make it possible to produce a molded body with no void, and also possible to contribute to improvement in manufacturability of outdoor heat exchanger 11 .
  • flat heat transfer tube 21 manufactured from the molded body is provided with tapered first side portion 29 a , so that the manufacturability can be improved while ensuring the heat transfer performance, which will be described below.
  • outdoor heat exchanger 11 in refrigeration cycle apparatus 1 heat is exchanged between the air fed into outdoor heat exchanger 11 (see arrow Y 1 ) and the refrigerant flowing through flat heat transfer tube 21 .
  • outdoor heat exchanger 11 functions as an evaporator
  • the air fed into outdoor heat exchanger 11 exchanges heat with the refrigerant flowing through flat heat transfer tube 21 , and thus, the temperature of the air lowers from the windward side to the leeward side.
  • the thermal load decreases with increasing ventilation distance in which air flows from the windward side to the leeward side.
  • the region (range) under high thermal load heat exchange between air and refrigerant is actively performed.
  • a heat exchanger functions as an evaporator, if the refrigerant is completely gasified by heat exchange with air, the heat transfer performance cannot be improved.
  • first side portion 29 a is processed (shrunk) to be tapered toward opening end face 26 to be reduced in width (from a width W 1 to a width W 2 ).
  • first opening end 28 a of first flow path 27 a located closest to first side portion 29 a located on the leeward side is to be narrowed in the Y-axis direction so as to conform to the tapered first side portion 29 a .
  • first opening end 28 a is to have second flow path cross-sectional area S 2 smaller than first flow path cross-sectional area S 1 of opening end 28 of each of other flow paths 27 .
  • second flow path cross-sectional area S 2 of first opening end 28 a of first flow path 27 a located on the leeward side is smaller than first flow path cross-sectional area S 1 of opening end 28 of each of other flow paths 27 , as shown in FIG. 9 (in the lower stage), the refrigerant less easily flows through first flow path 27 a , and accordingly, more refrigerant flows through flow path 27 located on the windward side or the like under high thermal load, so that complete gasification of the refrigerant can be suppressed. As a result, the heat transfer performance as outdoor heat exchanger 11 can be ensured.
  • first side portion 29 a of connecting portion 25 of flat heat transfer tube 21 connected to header 31 is tapered, which makes it easy to insert it into opening 33 formed in header 31 . This makes it possible to contribute to improvement in manufacturability of outdoor heat exchanger 11 .
  • connecting portion 25 since the tapered first side portion 29 a of connecting portion 25 comes into contact with opening inner wall surface 34 of opening 33 , the length of the portion of connecting portion 25 (flat heat transfer tube 21 ) that is inserted into header 31 is uniquely defined. Thereby, connecting portion 25 can be prevented, for example, from being inserted more than necessary into opening 33 of header 31 . This can consequently contribute to stabilization of the flow of the refrigerant inside header 31 .
  • opening end face 26 of flat heat transfer tube 21 is located to extend from first side portion 29 a to second side portion 29 b in a third direction inclined toward main body 23 with respect to the Y-axis direction.
  • first side portion 29 a is tapered toward opening end face 26 to be reduced in width.
  • First opening end 28 a of first flow path 27 a located closest to first side portion 29 a has second flow path cross-sectional area S 2 smaller than first flow path cross-sectional area S 1 of opening end 28 of each of other flow paths 27 .
  • step T 4 the molded body is cut and shrunk.
  • molded body 20 is cut in a direction inclined with respect to the Y-axis direction.
  • each of the plurality of flow paths 27 opens as opening end face 26 .
  • molded body 20 is cut as well as shrunk. Specifically, pressure is applied (see arrow P 1 ), for example, with a plate member (not shown) or the like to first side portion 29 a of molded body 20 so as to taper this first side portion 29 a such that molded body 20 is reduced in width toward opening end face 26 .
  • first opening end 28 a of first flow path 27 a located closest to first side portion 29 a among the plurality of flow paths 27 is to have second flow path cross-sectional area S 2 smaller than first flow path cross-sectional area S 1 of opening end 28 of each of other flow paths 27 .
  • flat heat transfer tube 21 including main body 23 and connecting portion 25 is completed (step T 5 ).
  • attachment of flat heat transfer tube 21 onto header 31 ends, and the main part of outdoor heat exchanger 11 is completed.
  • outdoor heat exchanger 11 According to outdoor heat exchanger 11 described above, the following effects are achieved in addition to the effects achieved by outdoor heat exchanger 11 described in the first embodiment.
  • opening end face 26 is located to extend from first side portion 29 a located on the leeward side to second side portion 29 b located on the windward side in the direction inclined toward main body 23 with respect to the Y-axis direction.
  • second flow path 27 b located on the leeward side is longer than first flow path 27 a located on the windward side.
  • the flow path resistance (friction resistance) of second flow path 27 b located on the leeward side becomes higher than the flow path resistance (friction resistance) of first flow path 27 a located on the windward side, so that the refrigerant easily flows through second flow path 27 b located on the windward side.
  • opening end face 26 of flat heat transfer tube 21 is located to extend in the Y-axis direction.
  • first side portion 29 a is tapered toward opening end face 26 to be reduced in width.
  • First opening end 28 a of first flow path 27 a located closest to first side portion 29 a has second flow path cross-sectional area S 2 smaller than first flow path cross-sectional area S 1 of opening end 28 of each of other flow paths 27 .
  • second side portion 29 b is tapered toward opening end face 26 to be reduced in width.
  • Second opening end 28 b of second flow path 27 b located closest to second side portion 29 b has a third flow path cross-sectional area S 3 smaller than first flow path cross-sectional area S 1 of opening end 28 of each of other flow paths 27 and larger than second flow path cross-sectional area S 2 .
  • step T 4 the molded body is cut and shrunk.
  • molded body 20 is cut in the Y-axis direction.
  • each of the plurality of flow paths 27 opens as opening end face 26 .
  • first side portion 29 a and second side portion 29 b in molded body 20 are tapered toward opening end face 26 such that molded body 20 is reduced in width.
  • First side portion 29 a is tapered by applying pressure (pressure A: see an arrow P 1 ). Also, second side portion 29 b is tapered by applying pressure lower than pressure A (pressure B: see an arrow P 2 ).
  • second opening end 28 b of second flow path 27 b located closest to second side portion 29 b is shorter in length narrowed in the Y-axis direction than first opening end 28 a of first flow path 27 a located closest to first side portion 29 a.
  • second opening end 28 b of second flow path 27 b is formed to have third flow path cross-sectional area S 3 larger than second flow path cross-sectional area S 2 of first opening end 28 a of first flow path 27 a .
  • flat heat transfer tube 21 including main body 23 and connecting portion 25 is completed (step T 5 ).
  • step T 6 flat heat transfer tube 21 is connected to header 31 (see FIG. 16 ).
  • connecting portion 25 of flat heat transfer tube 21 is inserted into opening 33 provided in header 31 as shown by an arrow P 3 , and first side portion 29 a and second side portion 29 b are brought into contact with opening inner wall surface 34 of opening 33 .
  • first side portion 29 a and second side portion 29 b are tapered, connecting portion 25 is easily inserted into opening 33 of header 31 . Further, the length of the portion of connecting portion 25 that is inserted into header 31 is uniquely defined, so that connecting portion 25 can be prevented, for example, from being inserted more than necessary into opening 33 of header 31 . Thus, attachment of flat heat transfer tube 21 onto header 31 ends, and the main part of outdoor heat exchanger 11 is completed.
  • outdoor heat exchanger 11 According to outdoor heat exchanger 11 described above, the following effects are achieved in addition to the effects achieved by outdoor heat exchanger 11 described in the first embodiment.
  • first side portion 29 a and second side portion 29 b each are tapered. Thereby, when connecting portion 25 of flat heat transfer tube 21 is connected to header 31 , this connecting portion 25 is more easily inserted into opening 33 provided in header 31 as compared with the case where only first side portion 29 a is tapered. This can consequently contribute to improvement in manufacturability of outdoor heat exchanger 11 .
  • connecting portion 25 can be prevented from being inserted more than necessary into opening 33 of header 31 . This can consequently contribute to stabilization of the flow of the refrigerant inside header 31 .
  • second opening end 28 b of second flow path 27 b located closest to second side portion 29 b has third flow path cross-sectional area S 3 smaller than first flow path cross-sectional area S 1 of opening end 28 of each of other flow paths 27 and larger than second flow path cross-sectional area S 2 .
  • second side portion 29 b on the windward side is tapered to thereby make it possible to minimize that the refrigerant less easily flows through second flow path 27 b .
  • the heat transfer performance as outdoor heat exchanger 11 can be maintained.
  • opening end face 26 of flat heat transfer tube 21 is located to extend from first side portion 29 a to second side portion 29 b in the third direction inclined toward main body 23 with respect to the Y-axis direction.
  • first side portion 29 a is tapered toward opening end face 26 to be reduced in width.
  • First opening end 28 a of first flow path 27 a located closest to first side portion 29 a has second flow path cross-sectional area S 2 smaller than first flow path cross-sectional area S 1 of opening end 28 of each of other flow paths 27 .
  • Second side portion 29 b is tapered toward opening end face 26 to be reduced in width.
  • Second opening end 28 b of second flow path 27 b located closest to second side portion 29 b has third flow path cross-sectional area S 3 smaller than first flow path cross-sectional area S 1 of opening end 28 of each of other flow paths 27 and larger than second flow path cross-sectional area S 2 .
  • step T 4 the molded body is cut and shrunk.
  • molded body 20 is cut in a direction inclined with respect to the Y-axis direction.
  • each of the plurality of flow paths 27 opens as opening end face 26 .
  • first side portion 29 a and second side portion 29 b in molded body 20 are tapered toward opening end face 26 such that molded body 20 is reduced in width.
  • First side portion 29 a is tapered by applying pressure (pressure A: see an arrow P 1 ). Also, second side portion 29 b is tapered by applying pressure lower than pressure A (pressure B: see an arrow P 2 ).
  • second opening end 28 b of second flow path 27 b located closest to second side portion 29 b is shorter in length narrowed in the Y-axis direction than first opening end 28 a of first flow path 27 a located closest to first side portion 29 a.
  • second opening end 28 b of second flow path 27 b is formed to have third flow path cross-sectional area S 3 larger than second flow path cross-sectional area S 2 of first opening end 28 a of first flow path 27 a .
  • flat heat transfer tube 21 including main body 23 and connecting portion 25 is completed (step T 5 ).
  • step T 6 flat heat transfer tube 21 is connected to header 31 .
  • both first side portion 29 a and second side portion 29 b are tapered, connecting portion 25 is easily inserted into opening 33 of header 31 .
  • the length of the portion of connecting portion 25 that is inserted into header 31 is uniquely defined, so that connecting portion 25 can be prevented, for example, from being inserted more than necessary into opening 33 of header 31 .
  • Outdoor heat exchanger 11 described above can achieve both the effect achieved by outdoor heat exchanger 11 described in the second embodiment and the effect achieved by outdoor heat exchanger 11 described in the third embodiment.
  • opening end face 26 is located to extend from first side portion 29 a to second side portion 29 b in the direction inclined toward main body 23 with respect to the Y-axis direction.
  • first flow path 27 a becomes longer than second flow path 27 b , and the flow path resistance (friction resistance) of first flow path 27 a becomes higher than the flow path resistance (friction resistance) of second flow path 27 b , so that the refrigerant easily flows through second flow path 27 b located on the windward side.
  • both first side portion 29 a and second side portion 29 b are tapered.
  • second opening end 28 b of second flow path 27 b located closest to second side portion 29 b has third flow path cross-sectional area S 3 smaller than first flow path cross-sectional area S 1 of opening end 28 of each of other flow paths 27 and larger than second flow path cross-sectional area S 2 .
  • second side portion 29 b on the windward side is tapered to thereby make it possible to minimize that the refrigerant less easily flows through second flow path 27 b .
  • the heat transfer performance as outdoor heat exchanger 11 can be maintained.
  • first side portion 29 a and second side portion 29 b each are tapered, so that this connecting portion 25 is more easily inserted into opening 33 provided in header 31 . This can consequently contribute to improvement in manufacturability of outdoor heat exchanger 11 .
  • connecting portion 25 comes into contact with opening inner wall surface 34 of opening 33 , so that connecting portion 25 can be prevented, for example, from being inserted more than necessary into opening 33 of header 31 . This can consequently contribute to stabilization of the flow of the refrigerant inside header 31 .
  • Outdoor heat exchanger 11 may however be of a multi-row type and may be a two-row type outdoor heat exchanger 11 in which an outdoor heat exchanger 11 a and an outdoor heat exchanger 11 b are arranged in the direction in which air flows, as shown in FIG. 20 .
  • each of outdoor heat exchangers 11 is applicable to: a portion of outdoor heat exchanger 11 a where a flat heat transfer tube is connected to a header 31 a ; and a portion of outdoor heat exchanger 11 b where a flat heat transfer tube is connected to a header 31 b , each of these portions being shown inside a dotted-line frame DL.
  • an outdoor heat exchanger in which three or more rows of outdoor heat exchangers are arranged may be applicable. Further, the present invention is applicable not only to outdoor heat exchanger 11 but also to indoor heat exchanger 5 as required.
  • the outdoor heat exchangers described in the respective embodiments can be variously combined with one another as required.
  • the present disclosure is effectively applicable to a heat exchanger including a flat heat transfer tube.
  • 1 refrigeration cycle apparatus 3 compressor, 5 indoor heat exchanger, 7 fan, 9 expansion valve, 10 housing, 11 outdoor heat exchanger, 13 propeller fan, 15 four-way valve, 17 refrigerant pipe, 20 molded body, 21 flat heat transfer tube, 23 main body, 25 connecting portion, 26 opening end face, 27 flow path, 27 a first flow path, 27 b second flow path, 28 opening end, 28 a first opening end, 28 b second opening end, 29 a first side portion, 29 b second side portion, 31 header, 33 opening, 34 opening inner wall surface, 41 heat dissipation fin, S 1 first flow path cross-sectional area, S 2 second flow path cross-sectional area, S 3 third flow path cross-sectional area, Y 1 , P 1 , P 2 , P 3 arrow (insertion), DL frame.

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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)
US18/254,794 2021-02-04 2021-02-04 Heat exchanger and refrigeration cycle apparatus including the same Abandoned US20240003636A1 (en)

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JPH06341789A (ja) * 1993-06-01 1994-12-13 Mitsubishi Heavy Ind Ltd 熱交換器
JPH10206084A (ja) * 1997-01-20 1998-08-07 Zexel Corp 熱交換器の製造方法
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WO2022168232A1 (ja) 2022-08-11
JP7483062B2 (ja) 2024-05-14
EP4290170A1 (en) 2023-12-13

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