EP2735836A2 - Wärmetauscher - Google Patents

Wärmetauscher Download PDF

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Publication number
EP2735836A2
EP2735836A2 EP13193227.9A EP13193227A EP2735836A2 EP 2735836 A2 EP2735836 A2 EP 2735836A2 EP 13193227 A EP13193227 A EP 13193227A EP 2735836 A2 EP2735836 A2 EP 2735836A2
Authority
EP
European Patent Office
Prior art keywords
pipe
connecting pipes
heat exchanger
header pipe
hairpin
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.)
Granted
Application number
EP13193227.9A
Other languages
English (en)
French (fr)
Other versions
EP2735836A3 (de
EP2735836B1 (de
Inventor
Ken Watanabe
Isao Hashimoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy 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 Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Publication of EP2735836A2 publication Critical patent/EP2735836A2/de
Publication of EP2735836A3 publication Critical patent/EP2735836A3/de
Application granted granted Critical
Publication of EP2735836B1 publication Critical patent/EP2735836B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • F28D1/047—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 bent, e.g. in a serpentine or zig-zag
    • F28D1/0475—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 bent, e.g. in a serpentine or zig-zag the conduits having a single U-bend
    • 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
    • F28F2265/00—Safety or protection arrangements; Arrangements for preventing malfunction
    • F28F2265/26—Safety or protection arrangements; Arrangements for preventing malfunction for allowing differential expansion between elements

Definitions

  • the present invention relates to a heat exchanger which is used in air conditioners, chillers, and the like.
  • a heat exchanger which includes a plurality of heat-transfer pipes between a gas header and an external fluid, and passes the fluid through fins provided between the heat-transfer pipes to thereby perform heat exchange between the fluid passing through the heat-transfer pipes and the fluid passing through the fins.
  • a plurality of pipes is connected to the gas header, and these pipes carry out distribution of a refrigerant to the heat exchanger by being connected to hairpin tubes.
  • the gas header Due to its larger volume compared with the pipe which introduces the refrigerant into the gas header, the gas header undergoes rapid thermal expansion upon inflow of a refrigerant at pressure or temperature higher than specified one. This poses a problem that the hairpin tube, which is fixed to the heat exchanger, may crack under stress as the gas header expands while pulling the hairpin tube. This may lead to shorter life of the heat exchanger.
  • Patent Literature 1 is cited as a literature which discloses a countermeasure against this problem.
  • Patent Literature 1 shows that, of auxiliary connecting pipes, at least the auxiliary connecting pipes at the center in the width direction or those at both ends are formed into a curved shape, so that contraction deformation or extension deformation occurs, which prevents generation of stress due to bending of a lower header tank.
  • Patent Literature 1 describes a method, in which, of the auxiliary connecting pipes, at least the auxiliary connecting pipes at the center in the width direction or those at both ends are formed into a curved shape, so that contraction deformation or extension deformation occurs, which prevents generation of stress due to bending of the lower header tank.
  • the method described in Patent Literature 1 has a problem that, since the facility cannot structurally afford enough space for the auxiliary connecting pipes to be installed in a curved state, only straight short connecting pipes can be installed.
  • Patent Literature 1 has another problem that, since the auxiliary connecting pipes and the gas header are connected, the facility becomes larger.
  • the present invention has been made in view of the above circumstances, and an object thereof is to provide a heat exchanger which can alleviate the effects of stress due to thermal elongation of branch pipes with a more compact structure.
  • the heat exchanger includes: a heat exchange unit which exchanges heat between a refrigerant flowing through an inside thereof and an external fluid; a plurality of hairpin tubes which is installed at an end of the heat exchange unit and serves as an outlet or an inlet of the refrigerant flowing through the inside of the heat exchange unit; a plurality of connecting pipes which has one ends thereof connected to the plurality of hairpin tubes, respectively; and a header pipe to which the other ends of the plurality of connecting pipes are connected.
  • Each of the plurality of connecting pipes includes a detour section which is bent such that a pipe length becomes longer than a linear distance between the hairpin tube and the header pipe.
  • each of the plurality of connecting pipes includes the bent detour section, the facility can be made compact as compared with a case where each of the plurality of connecting pipes is formed into a linear shape.
  • the detour section as seen from the hairpin tube, may pass by the header pipe and thereafter may have a U-shaped portion which turns around and heads toward the header pipe.
  • the pipe length can be made longer than the linear distance. This allows the facility to be made compact.
  • each of the plurality of connecting pipes connecting the plurality of hairpin tubes and the header pipe includes the detour section which is bent such that the pipe length becomes longer than the linear distance between the hairpin tube and the header pipe.
  • the stress exerted on the hairpin tube can be alleviated even if a refrigerant at pressure or temperature higher than specified one flows into the header pipe.
  • each of the plurality of connecting pipes includes the bent detour section, the facility can be made compact as compared with a case where each of the plurality of connecting pipes is formed into a linear shape.
  • FIG. 1 is a side view showing a heat exchanger according to the embodiment of the heat exchanger according to the present invention.
  • a heat exchanger 1 includes a heat exchange unit 2 which is constituted of fins (not shown) and hairpin tubes 3 positioned close to each other so as to increase the heat exchange efficiency.
  • the plurality of hairpin tubes 3 is connected to connecting pipes 4 at connecting parts 4a, and each of the hairpin tubes 3 is connected as a continuous integral part to constitute a refrigerant circuit.
  • one end of the connecting pipe 4 is connected to the hairpin tube 3 at the connecting part 4a.
  • the other end of the connecting pipe 4 and a refrigerant supply port (not shown) of a header pipe 5 are connected at a connecting part 4b.
  • a connection method for example, pipe welding such as butt welding is used.
  • Each of the plurality of connecting pipes 4 is bent such that a pipe length of the connecting pipe 4 becomes longer than a linear distance between the hairpin tube 3 and the header pipe 5.
  • the bent connecting pipe 4" as seen from the hairpin tube 3, passes by the header pipe 5 and thereafter have a U-shaped portion which turns around and heads toward the header pipe 5.
  • the U-shape of the connecting pipe 4 is formed, for example, by welding a substantially linear pipe and a U-shaped pipe with their ends butted against each other.
  • the connecting pipe 4 Since the connecting pipe 4 is bent such that the pipe length becomes longer, the connecting pipe 4 makes a detour to be connected to the header pipe 5.
  • the connecting pipe 4 As a shape into which the connecting pipe 4 is bent so as to make a detour, the connecting pipe 4 is bent into a U-shape.
  • the connecting pipes 4 are positioned at predetermined intervals such that the connecting pipes 4 are roughly parallel to each other.
  • the connecting pipes 4 are bent into the same shape, but if the facility does not structurally allow for the same shape, the connecting pipes 4 are bent such that the pipe length becomes longer than the linear distance between the hairpin tube 3 and the header pipe 5.
  • the connecting pipes 4 are bent on the same plane.
  • a refrigerant for heat exchange is introduced inside the hairpin tube 3 on a refrigerant fluid side which is at a higher temperature than an external fluid. Fins on an external fluid side, which is at a lower temperature than the refrigerant fluid, are provided between the plurality of hairpin tubes 3 penetrating the heat exchange unit 2. By passing a fluid through the hairpin tubes 3 and the fins, heat exchange is performed between the fluid passing through the hairpin tubes 3 and the fluid passing through the fins.
  • Each of the connecting pipes 4 includes the detour section which is bent such that the pipe length becomes longer than the linear distance between the hairpin tube 3 and the header pipe 5.
  • the stress exerted on the hairpin tube 3 can be alleviated even if a refrigerant at pressure or temperature higher than specified one flows into the header pipe 5 and causes thermal expansion of the header pipe 5.
  • each of the plurality of connecting pipes 4 includes the bent detour section, the facility can be made compact as compared with a case where each of the plurality of connecting pipes 4 is formed into a linear shape.
  • the connecting pipe 4 may be bent into a round shape such that the pipe length of the connecting pipe 4 becomes longer.
  • the connecting pipe 4 is bent so as to, as seen from the hairpin tube 3, pass by the header pipe 5 and thereafter to be shaped into U-shape which turns around and heads toward the header pipe 5.
  • the connecting pipe 4 is provided such that the connecting pipe 4 gains in pipe length from the connecting part 4a, at which the connecting pipe 4 is connected to the hairpin tube 3, before reaching the connecting part 4b, at which the connecting pipe 4 is connected to the header pipe 5.
  • the connecting pipe 4 assumes a round shape before reaching the connecting part 4b and being connected.
  • the connecting pipe 4 may be provided three-dimensionally such that the pipe length of the connecting pipe 4 becomes longer. More specifically, while the connecting pipe 4 has been provided such that the pipe length becomes longer in an X-Y coordinate plane (two dimensions), the freedom of extending the pipe length of the connecting pipe 4 can be further increased by three-dimensionally providing the connecting pipe 4 using a Z-axis.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
EP13193227.9A 2012-11-21 2013-11-18 Wärmetauscher Active EP2735836B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2012255397A JP6172701B2 (ja) 2012-11-21 2012-11-21 熱交換器

Publications (3)

Publication Number Publication Date
EP2735836A2 true EP2735836A2 (de) 2014-05-28
EP2735836A3 EP2735836A3 (de) 2014-12-10
EP2735836B1 EP2735836B1 (de) 2016-09-21

Family

ID=49626813

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13193227.9A Active EP2735836B1 (de) 2012-11-21 2013-11-18 Wärmetauscher

Country Status (2)

Country Link
EP (1) EP2735836B1 (de)
JP (1) JP6172701B2 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017168669A1 (ja) * 2016-03-31 2017-10-05 三菱電機株式会社 熱交換器及び冷凍サイクル装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10148482A (ja) 1996-11-15 1998-06-02 Kobe Steel Ltd オープンラック型蒸発装置の熱交換パネル

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1619703C3 (de) * 1967-04-04 1982-03-18 Gea Luftkuehlergesellschaft Happel Gmbh & Co Kg, 4630 Bochum Diskontinuierlich arbeitender Desublimator und Verfahren zum Betreiben desselben
FR1564900A (de) * 1968-03-14 1969-04-25
SE374600B (de) * 1973-03-23 1975-03-10 A N Alexander
JPS5618866U (de) * 1979-07-19 1981-02-19
JPS5758050A (en) * 1980-09-24 1982-04-07 Fuji Heavy Ind Ltd Heat exchanger
JPS58138986A (ja) * 1982-02-15 1983-08-18 Fuji Heavy Ind Ltd 熱交換器
JPH02219986A (ja) * 1989-02-21 1990-09-03 Matsushita Refrig Co Ltd 熱交換器
JP3255818B2 (ja) * 1995-03-20 2002-02-12 カルソニックカンセイ株式会社 電子部品用冷却装置
JP5320010B2 (ja) * 2008-10-07 2013-10-23 三菱重工業株式会社 管寄せ管台の溶接構造

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10148482A (ja) 1996-11-15 1998-06-02 Kobe Steel Ltd オープンラック型蒸発装置の熱交換パネル

Also Published As

Publication number Publication date
JP6172701B2 (ja) 2017-08-02
EP2735836A3 (de) 2014-12-10
JP2014102052A (ja) 2014-06-05
EP2735836B1 (de) 2016-09-21

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