EP0853227A2 - Heat exchanger - Google Patents

Heat exchanger Download PDF

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Publication number
EP0853227A2
EP0853227A2 EP98100457A EP98100457A EP0853227A2 EP 0853227 A2 EP0853227 A2 EP 0853227A2 EP 98100457 A EP98100457 A EP 98100457A EP 98100457 A EP98100457 A EP 98100457A EP 0853227 A2 EP0853227 A2 EP 0853227A2
Authority
EP
European Patent Office
Prior art keywords
tube
flat portion
burring
beads
brazing
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.)
Withdrawn
Application number
EP98100457A
Other languages
German (de)
French (fr)
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EP0853227A3 (en
Inventor
Soichi c/o Zexel Corporation Kato
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.)
Bosch Corp
Original Assignee
Zexel Corp
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 Zexel Corp filed Critical Zexel Corp
Publication of EP0853227A2 publication Critical patent/EP0853227A2/en
Publication of EP0853227A3 publication Critical patent/EP0853227A3/en
Withdrawn legal-status Critical Current

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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
    • F28D1/03—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 plate-like or laminated conduits
    • F28D1/0391—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 plate-like or laminated conduits a single plate being bent to form one or more 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
    • 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
    • F28F2275/00—Fastening; Joining
    • F28F2275/04—Fastening; Joining by brazing

Definitions

  • the invention relates to a heat exchanger having an improved brazing property between tubes with beads formed and tube insertion holes of header pipes.
  • a conventionally known heat exchanger has a plurality of tubes laminated, ends of the respective tubes inserted into tube insertion holes of header pipes, and the tubes brazed with the edges of the tube insertion holes.
  • a medium for heat exchange is meandered a plurality of times to flow between an inlet joint and an outlet joint, which are formed on the header pipes, through the tubes while performing heat exchange.
  • the tube used in the heat exchanger is known to be produced by folding a thin plate made of aluminum alloy or the like or laminating the two plates and brazing both ends of the plate in the breadth direction.
  • This tube has inward projections (hereinafter called “beads”) which are formed of bends on the plate produced by rolling. These beads serve as a reinforcing material to improve a pressure resistance of the tube by being brazed mutually or by being brazed with an opposed tube face to divide inside passages and also expand the heat conducting face against a medium to improve a heat exchanging efficiency.
  • the beads may be formed to continue in the longitudinal direction of the tube, in the form of circle or ellipse.
  • the header pipes used for the heat exchanger may be formed by forming a flat material of aluminum alloy into an annular tube or by assembling a header pipe material for an end plate and a tank plate from a radial direction.
  • Tube insertion holes of the header pipe are formed when the header pipe material is pressed. And, they are shaped to correspond to the cross sectional shape of the tube and generally slightly larger than the outer periphery of the tube so that the tube can be inserted.
  • a flat portion without the beads is formed at given portions of the tube (e.g., Japanese Patent Laid-Open Publication No. Hei 8-200977), or a protruded face (hereinafter called "burring") is broadly formed at the edge of the tube insertion hole.
  • the tube is formed to have flat ends, the strength within the header pipe is lowered when it is brazed, and results in defectively brazing the tube and the header pipe. Therefore, the beads are also formed at the ends of the tube. Specifically, the flat portion is formed to locate between the adjacent beads with respect to the longitudinal direction of the tube.
  • the heat exchanger disclosed in Japanese Patent Laid-Open Publication No. Hei 8-49995 has a large number of beads formed at a given pitch in the longitudinal direction of the tube, and the burring which is longer than the given pitch is formed, so that the brazing face between the burring and the flat portion located between the beads is secured.
  • the heat exchanger disclosed in Japanese Patent Laid-Open Publication No. Hei 8-49995 has the beads on the burring, so that the burring is required to be formed longer than a required brazing width. But, forming a long burring is difficult and also limited because it involves draw forming of the header pipe material.
  • the invention relates to a heat exchanger, which is formed by inserting ends of a tube having long beads formed to divide inside passages into tube insertion holes of header pipes and brazing the tube with edges of the tube insertion holes, wherein a flat portion without the beads is formed on the ends of the tube, a burring is formed on the edges of the tube insertion holes so to be brazed in contact with the flat portion, and the flat portion is formed to have a width in a longitudinal direction of the tube, the width being larger than that of the burring in the longitudinal direction of the tube.
  • the strength of the tube in the header pipes can be secured while brazing, defective brazing can be decreased, and even if the inserted degree of the tube is deviated to some extent, a brazing area can be secured.
  • a brazing property can be improved, and a pressure resistance involved can also be improved.
  • a heat exchanger 1 of the invention has a plurality of tubes 2, 2, which are stacked with fins 5, 5 intervened between them, connected to communicate with a pair of header tubes 3, 4 which are disposed on both ends of the tubes 2, 2.
  • the respective header pipes 3, 4 have upper and lower end openings closed by a blind cap 6 and their interior divided by partition plates 7 disposed at given locations. Besides, the header pipes are provided with an inlet joint 3a to receive a heat exchange medium and an output joint 4a to discharge the heat exchange medium outside.
  • the header pipes 3, 4 are formed into a cylindrical tube having a circular cross section. And, tube insertion holes 9 are formed in a longitudinal direction of the header pipes 3, 4 at predetermined intervals.
  • the tubes 2 have their ends brazed into the tube insertion holes 9.
  • a side plate 8 is disposed at the top and bottom of the layer of the tubes 2, 2. The side plate 8 has its ends fixed to the header pipes 3, 4 and reinforces a structural strength of the heat exchanger.
  • the heat exchange medium taken through the inlet joint 3a is meandered a plurality of times to flow between the header pipes 3, 4 in a unit of a given group of tubes 2, 2, passed through the tubes 2, 2 while heat-exchanging, and discharged from the outlet joint 4a. And, the heat exchange by the medium is promoted by the heat conduction by the fins 5, 5 intervened between the tubes 2, 2 and the side plate 8.
  • Fig. 2 is a perspective view showing the neighborhood of the end of the tube 2 and the tube insertion hole 9.
  • the tube 2 and the header pipe 4 (or header pipe 3) are connected to communicate mutually by inserting the end of the tube 2 into the tube insertion hole 9 (in the direction of an arrow in the drawing) and brazing a flat portion 2a of the tube 2 and a burring 9a of the tube insertion hole 9.
  • the tube 2 is made of a plate (brazing sheet) having a brazing material claded on its inner face. Specifically, the tube 2 is formed into a flat shape having flat faces to face each other by forming joint sections 10, 10 at both ends in the breadth direction of the plate, and folding the plate at the center so to contact the joint sections 10, 10 mutually.
  • a plurality of beads 11, 11 are formed to continue on the flat faces and in the longitudinal direction of the tube 2, and a plurality of passages 12, 12 are formed by being divided by the beads 11, 11 inside the tube 2. Tops of the beads 11, 11 are brazed to the opposed inner face of the flat face.
  • the flat portion 2a is formed on a part of the tube 2 where the beads 11, 11 are not formed as indicated by chain lines. In this embodiment, it is formed by pressing back the beads which were once formed on the pertinent position.
  • the beads 11, 11 are formed at the middle and ends of the tube 2. And, the flat portion 2a is formed between the beads 11, 11 in the longitudinal direction of the tube 2.
  • the flat portion 2a is formed to have a width in the longitudinal direction of the tube 2 and larger than the width of a portion to contact with the burring 9a as described afterward.
  • Fig. 3 is a cross-sectional view showing a state that one end of the tube 2 is inserted into the tube insertion hole 9 and the flat portion 2a is aligned in contact with the burring 9a.
  • the flat portion 2a and the burring 9a are mutually brazed in this state.
  • the burring 9a is formed into an arc to protrude from the end of the tube insertion hole 9 inwardly of the header pipe 4.
  • the flat portion 2a is formed to have a width large enough to accommodate the entire face of the burring and also its width is wider in the longitudinal direction of the tube. Specifically, a given interval is formed in the breadth direction of the tube 2 between the burring 9a and the beads 11, 11 and at the center and ends of the tube 2, and the flat portion 2a is positioned on the interval.
  • the tube 2 Since the beads 11, 11 are also formed at the ends of the tube 2, the tube 2 has its strength secured within the header pipe 4. Especially, it is not deformed by heat during brazing, and brazing property between the flat portion 2a and the burring 9a is improved.
  • Fig. 4 is a vertical sectional view showing a state that the flat portion 2a is aligned with the burring 9a.
  • A indicates a width of the flat portion 2a in the longitudinal direction of the tube 2
  • B a width of the burring 9a in the longitudinal direction of the tube 2.
  • the width A of the flat portion 2a is larger than the width B of the burring 9a, so that a brazing area between the tube 2 and the header pipe 4 (header pipe 3) can be secured sufficiently. Therefore, even if an insertion degree of the end of the tube 2 is deviated, the brazing property can be improved, and the pressure resistance of the heat exchanger can be improved accordingly.
  • the heat exchanger of this embodiment has a simplified shape of the flat portion 2a so that it can be formed with ease as shown in Fig. 5.
  • the flat portion 2a of the first embodiment has boundaries with the same curvature as the burring 9a, but the flat portion 2a of this embodiment has linear boundaries. Since other structures are the same as in the first embodiment, their description is omitted.
  • A is a width of the flat portion 2a
  • B is a width of the burring 9a.
  • the flat portion is formed into a rectangular shape having the width A with respect to the arc-shaped burring brazing section, so that the flat portion can be formed simply and easily.
  • the invention relates to a heat exchanger which is formed by inserting ends of a tube having long beads formed to divide inside passages into tube insertion holes of header pipes and brazing the tube with edges of the tube insertion holes, wherein a flat portion without the beads is formed on the ends of the tube, a burring is formed on the edges of the tube insertion holes so to be brazed in contact with the flat portion, and the flat portion is formed to have a width in the longitudinal direction of the tube, which is larger than that of the burring in the longitudinal direction of the tube.
  • the tube's strength in the header pipe can be secured, and the brazing area can be secured even if the insertion degree of the tube is deviated to some extent.
  • the brazing property can be improved, and the pressure resistance involved can be improved.

Abstract

To obtain a heat exchanger having an improved brazing property between tubes with beads formed and tube insertion holes of header pipes. A heat exchanger 1 which is formed by inserting ends of a tube 2, which has long beads 11, 11 formed to divide inside passages, into tube insertion holes 9 of header pipes 3, 4 and brazing the tube 2 with edges of the tube insertion holes 9, wherein a flat portion 2a without the beads 11 is formed on the ends of the tube 2, a burring 9a is formed on the edges of the tube insertion holes 9 so to be brazed in contact with the flat portion 2a, and the flat portion 2a is formed to have a width A in a longitudinal direction of the tube, which is larger than a width B of the burring 9a in the longitudinal direction of the tube. Accordingly, even if the inserting degree of the tube 2 is deviated to some extent, brazing between the tube and the header pipes is not affected at all.

Description

Technical Field of the Invention
The invention relates to a heat exchanger having an improved brazing property between tubes with beads formed and tube insertion holes of header pipes.
Prior Art
A conventionally known heat exchanger has a plurality of tubes laminated, ends of the respective tubes inserted into tube insertion holes of header pipes, and the tubes brazed with the edges of the tube insertion holes. In this type of heat exchanger, a medium for heat exchange is meandered a plurality of times to flow between an inlet joint and an outlet joint, which are formed on the header pipes, through the tubes while performing heat exchange.
The tube used in the heat exchanger is known to be produced by folding a thin plate made of aluminum alloy or the like or laminating the two plates and brazing both ends of the plate in the breadth direction.
This tube has inward projections (hereinafter called "beads") which are formed of bends on the plate produced by rolling. These beads serve as a reinforcing material to improve a pressure resistance of the tube by being brazed mutually or by being brazed with an opposed tube face to divide inside passages and also expand the heat conducting face against a medium to improve a heat exchanging efficiency. The beads may be formed to continue in the longitudinal direction of the tube, in the form of circle or ellipse.
The header pipes used for the heat exchanger may be formed by forming a flat material of aluminum alloy into an annular tube or by assembling a header pipe material for an end plate and a tank plate from a radial direction.
Tube insertion holes of the header pipe are formed when the header pipe material is pressed. And, they are shaped to correspond to the cross sectional shape of the tube and generally slightly larger than the outer periphery of the tube so that the tube can be inserted.
And, when the tube has the beads, the cross sectional shape of the tube becomes complex, making it quite difficult to form the tube insertion hole which meets the complex shape. Therefore, a flat portion without the beads is formed at given portions of the tube (e.g., Japanese Patent Laid-Open Publication No. Hei 8-200977), or a protruded face (hereinafter called "burring") is broadly formed at the edge of the tube insertion hole.
Besides, if the tube is formed to have flat ends, the strength within the header pipe is lowered when it is brazed, and results in defectively brazing the tube and the header pipe. Therefore, the beads are also formed at the ends of the tube. Specifically, the flat portion is formed to locate between the adjacent beads with respect to the longitudinal direction of the tube. For example, the heat exchanger disclosed in Japanese Patent Laid-Open Publication No. Hei 8-49995 has a large number of beads formed at a given pitch in the longitudinal direction of the tube, and the burring which is longer than the given pitch is formed, so that the brazing face between the burring and the flat portion located between the beads is secured.
Problems to be solved by the Invention
In the heat exchanger described above, to achieve a sufficient pressure resistance against a heat exchange medium, it is required that the flat portion of the tube and the burring of the tube insertion hole are brazed widely to some extent with respect to the longitudinal direction of the tube. Especially, if a pressure is high as in a condenser, a remarkable pressure resistance is needed, and reliable brazing is significant.
In this connection, the heat exchanger disclosed in Japanese Patent Laid-Open Publication No. Hei 8-49995 has the beads on the burring, so that the burring is required to be formed longer than a required brazing width. But, forming a long burring is difficult and also limited because it involves draw forming of the header pipe material.
Therefore, to braze the burring, which cannot be made very long, with the flat portion formed between the adjacent beads, it is necessary to adjust a degree of inserting the tube so that the flat portion is positioned on the burring. This adjustment is unexpectedly difficult, and positioning is particularly difficult when the header pipe is circular. As a result, it becomes uncertain to secure the brazing width, and a brazing width happens to become insufficient, degrading a pressure resistance of the heat exchanger.
To solve the problems described above, it is an object of the present invention to provide a heat exchanger configured to securely braze a flat portion which is formed between beads in the longitudinal direction of a tube, and a burring formed on the edge of a tube insertion hole.
Means for solving the Problems
The invention relates to a heat exchanger, which is formed by inserting ends of a tube having long beads formed to divide inside passages into tube insertion holes of header pipes and brazing the tube with edges of the tube insertion holes, wherein a flat portion without the beads is formed on the ends of the tube, a burring is formed on the edges of the tube insertion holes so to be brazed in contact with the flat portion, and the flat portion is formed to have a width in a longitudinal direction of the tube, the width being larger than that of the burring in the longitudinal direction of the tube.
Thus, when the flat portion is formed between the beads with respect to the longitudinal direction of the tube and also formed wider than the width of the burring, the strength of the tube in the header pipes can be secured while brazing, defective brazing can be decreased, and even if the inserted degree of the tube is deviated to some extent, a brazing area can be secured. As a result, a brazing property can be improved, and a pressure resistance involved can also be improved.
Conventionally, when the flat portion is located between the beads in the longitudinal direction of the tube, it is necessary to adjust the inserting degree of the ends of the tube to contact the burring with the flat portion, and this adjustment is not easy. And, it is not stable to secure the brazing width of the flat portion and the burring in the longitudinal direction of the tube. In the present invention, however, it is easy to adjust the inserting degree of the tube, so that such instability can be remedied, and brazing reliability can be improved.
Embodiments of the invention
Specific embodiments of the invention will be described with reference to the drawings.
Brief Description of the Drawings
  • Fig. 1 A front view showing the heat exchanger according to a first embodiment of the invention.
  • Fig. 2 A perspective view showing the end and its neighborhood of a tube and a tube insertion hole according to the first embodiment of the invention.
  • Fig. 3 A cross-sectional view showing a state that a flat portion and a burring are aligned according to the first embodiment of the invention.
  • Fig. 4 A vertical sectional view showing a state that the flat portion and the burring are aligned according to the first embodiment of the invention.
  • Fig. 5 A cross-sectional view showing a state that a flat portion and a burring are aligned according to a second embodiment of the invention.
    • As shown in Fig. 1, a heat exchanger 1 of the invention has a plurality of tubes 2, 2, which are stacked with fins 5, 5 intervened between them, connected to communicate with a pair of header tubes 3, 4 which are disposed on both ends of the tubes 2, 2.
    The respective header pipes 3, 4 have upper and lower end openings closed by a blind cap 6 and their interior divided by partition plates 7 disposed at given locations. Besides, the header pipes are provided with an inlet joint 3a to receive a heat exchange medium and an output joint 4a to discharge the heat exchange medium outside. The header pipes 3, 4 are formed into a cylindrical tube having a circular cross section. And, tube insertion holes 9 are formed in a longitudinal direction of the header pipes 3, 4 at predetermined intervals. The tubes 2 have their ends brazed into the tube insertion holes 9. And, a side plate 8 is disposed at the top and bottom of the layer of the tubes 2, 2. The side plate 8 has its ends fixed to the header pipes 3, 4 and reinforces a structural strength of the heat exchanger.
    In the heat exchanger 1 of this embodiment, the heat exchange medium taken through the inlet joint 3a is meandered a plurality of times to flow between the header pipes 3, 4 in a unit of a given group of tubes 2, 2, passed through the tubes 2, 2 while heat-exchanging, and discharged from the outlet joint 4a. And, the heat exchange by the medium is promoted by the heat conduction by the fins 5, 5 intervened between the tubes 2, 2 and the side plate 8.
    Fig. 2 is a perspective view showing the neighborhood of the end of the tube 2 and the tube insertion hole 9. The tube 2 and the header pipe 4 (or header pipe 3) are connected to communicate mutually by inserting the end of the tube 2 into the tube insertion hole 9 (in the direction of an arrow in the drawing) and brazing a flat portion 2a of the tube 2 and a burring 9a of the tube insertion hole 9.
    The tube 2 is made of a plate (brazing sheet) having a brazing material claded on its inner face. Specifically, the tube 2 is formed into a flat shape having flat faces to face each other by forming joint sections 10, 10 at both ends in the breadth direction of the plate, and folding the plate at the center so to contact the joint sections 10, 10 mutually.
    And, a plurality of beads 11, 11 are formed to continue on the flat faces and in the longitudinal direction of the tube 2, and a plurality of passages 12, 12 are formed by being divided by the beads 11, 11 inside the tube 2. Tops of the beads 11, 11 are brazed to the opposed inner face of the flat face.
    The flat portion 2a is formed on a part of the tube 2 where the beads 11, 11 are not formed as indicated by chain lines. In this embodiment, it is formed by pressing back the beads which were once formed on the pertinent position.
    The beads 11, 11 are formed at the middle and ends of the tube 2. And, the flat portion 2a is formed between the beads 11, 11 in the longitudinal direction of the tube 2.
    The flat portion 2a is formed to have a width in the longitudinal direction of the tube 2 and larger than the width of a portion to contact with the burring 9a as described afterward.
    Fig. 3 is a cross-sectional view showing a state that one end of the tube 2 is inserted into the tube insertion hole 9 and the flat portion 2a is aligned in contact with the burring 9a. The flat portion 2a and the burring 9a are mutually brazed in this state.
    The burring 9a is formed into an arc to protrude from the end of the tube insertion hole 9 inwardly of the header pipe 4. And, the flat portion 2a is formed to have a width large enough to accommodate the entire face of the burring and also its width is wider in the longitudinal direction of the tube. Specifically, a given interval is formed in the breadth direction of the tube 2 between the burring 9a and the beads 11, 11 and at the center and ends of the tube 2, and the flat portion 2a is positioned on the interval.
    Since the beads 11, 11 are also formed at the ends of the tube 2, the tube 2 has its strength secured within the header pipe 4. Especially, it is not deformed by heat during brazing, and brazing property between the flat portion 2a and the burring 9a is improved.
    Fig. 4 is a vertical sectional view showing a state that the flat portion 2a is aligned with the burring 9a. In the drawing, A indicates a width of the flat portion 2a in the longitudinal direction of the tube 2, and B a width of the burring 9a in the longitudinal direction of the tube 2.
    As described above, the width A of the flat portion 2a is larger than the width B of the burring 9a, so that a brazing area between the tube 2 and the header pipe 4 (header pipe 3) can be secured sufficiently. Therefore, even if an insertion degree of the end of the tube 2 is deviated, the brazing property can be improved, and the pressure resistance of the heat exchanger can be improved accordingly.
    Conventionally, when the flat portion is formed between the beads in the longitudinal direction of the tube, it becomes difficult to adjust the insertion degree of the end of the tube, and it is instable to secure the brazing width between the flat portion in the longitudinal direction of the tube and the burring. But, this embodiment can remedy such instability and improve the brazing reliability because the insertion degree of the tube has a margin.
    Now, a second embodiment of the invention will be described.
    The heat exchanger of this embodiment has a simplified shape of the flat portion 2a so that it can be formed with ease as shown in Fig. 5. In other words, the flat portion 2a of the first embodiment has boundaries with the same curvature as the burring 9a, but the flat portion 2a of this embodiment has linear boundaries. Since other structures are the same as in the first embodiment, their description is omitted. In the drawing, A is a width of the flat portion 2a, and B is a width of the burring 9a.
    In this embodiment, the same effects as in the first embodiment can be obtained, and the flat portion is formed into a rectangular shape having the width A with respect to the arc-shaped burring brazing section, so that the flat portion can be formed simply and easily.
    Effects of the Invention
    As described above, the invention relates to a heat exchanger which is formed by inserting ends of a tube having long beads formed to divide inside passages into tube insertion holes of header pipes and brazing the tube with edges of the tube insertion holes, wherein a flat portion without the beads is formed on the ends of the tube, a burring is formed on the edges of the tube insertion holes so to be brazed in contact with the flat portion, and the flat portion is formed to have a width in the longitudinal direction of the tube, which is larger than that of the burring in the longitudinal direction of the tube.
    Thus, when the flat portion is formed between the beads and its width is larger than that of the burring, the tube's strength in the header pipe can be secured, and the brazing area can be secured even if the insertion degree of the tube is deviated to some extent. As a result, the brazing property can be improved, and the pressure resistance involved can be improved.
    Conventionally, when the flat portion is located between the beads in the longitudinal direction of the tube, it is necessary to adjust the inserting degree of the ends of the tube to contact the burring with the flat portion, and this adjustment is not easy. And, it is not stable to secure the brazing width of the flat portion and the burring in the longitudinal direction of the tube. In the present invention, however, it is easy to adjust the inserting degree of the tube, so that such instability can be remedied, and brazing reliability can be improved.

    Claims (1)

    1. A heat exchanger formed by inserting ends of a tube, which has long beads formed to divide inside passages, into tube insertion holes of header pipes and brazing the tube with edges of the tube insertion holes, characterized in that:
      a flat portion without the beads is formed on the ends of the tube, a burring is formed on the edges of the tube insertion holes so to be brazed in contact with the flat portion, and the flat portion is formed to have a width in a longitudinal direction of the tube, the width being larger than that of the burring in the longitudinal direction of the tube.
    EP98100457A 1997-01-14 1998-01-13 Heat exchanger Withdrawn EP0853227A3 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    JP9004833A JPH10206079A (en) 1997-01-14 1997-01-14 Heat-exchanger
    JP4833/97 1997-01-14

    Publications (2)

    Publication Number Publication Date
    EP0853227A2 true EP0853227A2 (en) 1998-07-15
    EP0853227A3 EP0853227A3 (en) 1999-03-24

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    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP98100457A Withdrawn EP0853227A3 (en) 1997-01-14 1998-01-13 Heat exchanger

    Country Status (3)

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    EP (1) EP0853227A3 (en)
    JP (1) JPH10206079A (en)
    KR (1) KR19980070184A (en)

    Cited By (4)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    EP1132706A3 (en) * 2000-03-06 2003-03-19 Mitsubishi Heavy Industries, Ltd. Heat exchanger
    CN103600149A (en) * 2013-11-15 2014-02-26 沈阳黎明航空发动机(集团)有限责任公司 Brazing method for thin-wall heat conducting pipes
    CN112682500A (en) * 2020-12-31 2021-04-20 南宁市安和机械设备有限公司 Oil cooler made of staggered dotting oil cooler tubes
    DE112016002244B4 (en) 2015-05-19 2023-11-02 Sanden Corporation Heat exchanger and manufacturing process therefor

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    Publication number Priority date Publication date Assignee Title
    JP2007278613A (en) * 2006-04-07 2007-10-25 Calsonic Kansei Corp Radiator with built-in oil cooler
    KR100737142B1 (en) * 2006-06-07 2007-07-06 주식회사 두원공조 Header structure of heat exchanger

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    Publication number Priority date Publication date Assignee Title
    JPH0849995A (en) 1994-08-08 1996-02-20 Calsonic Corp Heat exchanger
    JPH08200977A (en) 1995-01-27 1996-08-09 Zexel Corp Flat tube for heat exchanger and manufacture thereof

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    Cited By (5)

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    EP1132706A3 (en) * 2000-03-06 2003-03-19 Mitsubishi Heavy Industries, Ltd. Heat exchanger
    CN103600149A (en) * 2013-11-15 2014-02-26 沈阳黎明航空发动机(集团)有限责任公司 Brazing method for thin-wall heat conducting pipes
    CN103600149B (en) * 2013-11-15 2015-11-18 沈阳黎明航空发动机(集团)有限责任公司 A kind of method for welding of thin-wallconduit heat exchanger
    DE112016002244B4 (en) 2015-05-19 2023-11-02 Sanden Corporation Heat exchanger and manufacturing process therefor
    CN112682500A (en) * 2020-12-31 2021-04-20 南宁市安和机械设备有限公司 Oil cooler made of staggered dotting oil cooler tubes

    Also Published As

    Publication number Publication date
    EP0853227A3 (en) 1999-03-24
    JPH10206079A (en) 1998-08-07
    KR19980070184A (en) 1998-10-26

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