JP2008260049A - Heat exchanger and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger capable of enhancing the brazing property while suppressing the use of a brazing filler metal, and its manufacturing method. <P>SOLUTION: The heat exchanger comprises a tube 10, and a tank 2 having a core plate 20 and a tank body part 21. An end of the longitudinal direction X of the tube 10 is inserted in a tube insertion hole 221 of a tube joining face 22 on the core plate 20 and assembled. A paste-like brazing filler metal is arranged on a brazing filler metal arrangement part at a joined part of the tube 10 with the core plate 20. Thereafter, an assembly body of the tube 10 and the core plate 20 is heated and integrally brazed. An inclined surface 26b which is inclined with respect to a surface orthogonal to the longitudinal direction X of the tube and with respect to a surface parallel to the longitudinal direction X of the tube on the core plate 20 is formed on an inner circumferential edge of the tube insertion hole 221 so that a molten brazing filler metal melted by the heating is allowed to enter a space formed between the tube 10 and the inclined surface 26b. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a heat exchanger and a manufacturing method thereof.

  In the conventional heat exchanger, a large number of tubes and a large number of corrugated fins are alternately stacked to constitute a core portion. And the tank is arrange | positioned at the tube longitudinal direction edge part in the tube. This tank is composed of a core plate into which a tube is inserted, and a tank body part that is caulked and fixed to the core plate to form a space in the tank together with the core plate.

In such a heat exchanger, the tube and the core plate are joined by brazing (see, for example, Patent Documents 1 and 2).
JP-A-2005-118826 JP 2001-129658 A

  However, in the brazing methods described in Patent Documents 1 and 2, since the brazing material is only disposed in the vicinity of the joint between the tube and the core plate, due to variations in the fluidity of the brazing material during brazing (during heat treatment). There is a problem in that the brazing material does not reach the joint and a brazing defect occurs.

  On the other hand, it is conceivable to use a brazing paste material composed of an alloy powder, an organic solvent and a binder for brazing. Paste brazing material has affinity with the core plate, so if the brazing material is supplied after assembling the tube and the core plate, it will fit into the joint and improve brazing performance. Can do.

  However, as shown in FIG. 11, after the tube J10 and the core plate J20 are assembled, the paste-like brazing material J5 is melted during brazing even if it is disposed at the joint between the tube J10 and the core plate J20. There is a risk that the brazing material will flow out to other than the joints, resulting in poor brazing. In order to avoid this brazing failure, it is sufficient to supply more brazing material in advance than the required amount of brazing material. However, since the brazing material is expensive, the cost increases as the amount of brazing material used increases. End up.

  An object of this invention is to provide the heat exchanger and its manufacturing method which can improve brazing property, suppressing the usage-amount of a brazing material in view of the said point.

  In order to achieve the above object, in the present invention, a plurality of tubes (10) through which a fluid flows and a core provided at both ends of the tube (10) in the longitudinal direction (X) of the tube (10) are joined. A tank (2) having a plate (20) and a tank main body (21) that constitutes a tank internal space together with the core plate (20), and the tube (10) in the tube longitudinal direction (X) After the end portion is inserted and assembled into the tube insertion hole (221) of the tube joint surface (22) in the core plate (20), the brazing material placement portion in the joint portion between the tube (10) and the core plate (20) A heat exchanger in which a paste-like brazing material is disposed on the tube, and the assembly of the tube (10) and the core plate (20) is then heat-treated and brazed together. The inner circumferential edge of the tube insertion hole (221) has inclined surfaces (both inclined with respect to a surface perpendicular to the tube longitudinal direction (X) and a surface parallel to the tube longitudinal direction (X) in the core plate (20)). 26b) is formed, and the brazing material melted by the heat treatment enters the gap (27) formed between the tube (10) and the inclined surface (26b). It is a feature.

  Thus, after forming the inclined surface (26b) on the core plate (20) and assembling the tube (10) and the core plate (20), the paste-like brazing material having affinity with the core plate (20) And the brazing material melted by the heat treatment enters the gap (27) formed between the tube (10) and the inclined surface (26b), so that the tube (10) and the core plate (20 ) And the brazing material can be surely introduced into the joint portion, and the brazing material can be prevented from flowing out of the joint portion. Thereby, it becomes possible to improve brazing property, suppressing the usage-amount of brazing material.

  In the heat exchanger having the first feature, the gap (27) formed between the tube (10) and the inclined surface (26b) may be a brazing material arrangement portion.

  In this way, by supplying the brazing material directly to the joint between the tube (10) and the core plate (20), it becomes possible to further improve the brazing property while further reducing the amount of brazing material used. .

  Further, in the present invention, a plurality of tubes (10) through which fluid flows, and a core plate (20) provided at both ends of the tube (10) in the tube longitudinal direction (X) and joined with the tubes (10), And a tank (2) having a tank body (21) that constitutes a tank internal space together with the core plate (20), and the end of the tube (10) in the tube longitudinal direction (X) After being inserted into the tube insertion hole (221) of the tube joining surface (22) of the plate (20) and assembled, the paste is put on the brazing material arrangement part (26a) at the joint of the tube (10) and the core plate (20). A heat exchanger in which a brazing material is disposed and then the assembly of the tube (10) and the core plate (20) is heat-treated and brazed together. A cylindrical burring part (26) projecting to one side is formed at the inner peripheral edge of the bush insertion hole (221), and the one side surface at the tip of the burring part (26) is disposed on the brazing material. The second feature is that it is a part (26a).

  Thus, after assembling the tube (10) and the core plate (20), the core plate (20) has an affinity for the one side surface at the tip of the burring portion (26) of the core plate (20). By supplying the paste-like brazing material, the molten brazing material is easily introduced into the gap between the tube (10) and the burring portion (26) during the heat treatment. Thereby, brazing property can be improved. At the same time, since the outflow of the brazing material melted by the heat treatment to other than the joining portion can be suppressed, it is not necessary to supply extra brazing material in advance. Therefore, it is possible to improve the brazing property while suppressing the amount of brazing material used.

  Further, in the present invention, a plurality of tubes (10) through which fluid flows, and a core plate (20) provided at both ends of the tube (10) in the tube longitudinal direction (X) and joined with the tubes (10), And a tank (2) having a tank body (21) that constitutes a tank internal space together with a core plate (20), and a plate (10) with a tube (10 ) In which the end of the tube longitudinal direction (X) is inserted, and the tube longitudinal direction (X) of the core plate (20) is formed on the inner peripheral edge of the tube insertion hole (221). Made of a core plate that produces a core plate (20) by forming an inclined surface (26b) that is inclined with respect to a surface orthogonal to the surface and a surface parallel to the tube longitudinal direction (X) After the step and the core plate manufacturing step, the assembly step of assembling the tube (10) by inserting the end portion of the tube longitudinal direction (X) into the tube insertion hole (221) of the core plate (20) and assembling After the step, a brazing material disposing step of disposing a paste brazing material at the joint between the tube (10) and the core plate (20), and after the brazing material disposing step, the tube (10) and the core plate (20). A brazing step of brazing the assembled body of the two together by heat treatment, and in the brazing step, the gap (27) formed between the tube (10) and the inclined surface (26b) is subjected to the heat treatment. The third feature is that the melted brazing material enters.

  Thus, after forming the inclined surface (26b) on the core plate (20), the tube (10) and the core plate (20) are assembled, and then the paste-like brazing material having affinity with the core plate (20). In the brazing process, the molten brazing material enters the gap (27) formed between the tube (10) and the inclined surface (26b), thereby the tube (10) and the core plate. The brazing material can be reliably introduced into the joint with (20), and the outflow of the brazing material to other than the joint can be suppressed. Thereby, it becomes possible to improve brazing property, suppressing the usage-amount of brazing material.

  In the heat exchanger manufacturing method of the third feature, in the brazing material arranging step, the brazing material is arranged in the gap (27) formed between the tube (10) and the inclined surface (26b). May be.

  In this way, by supplying the brazing material directly to the joint between the tube (10) and the core plate (20), it becomes possible to further improve the brazing property while further reducing the amount of brazing material used. .

  Further, in the present invention, a plurality of tubes (10) through which fluid flows, and a core plate (20) provided at both ends of the tube (10) in the tube longitudinal direction (X) and joined with the tubes (10), And a tank (2) having a tank body (21) that constitutes a tank internal space together with a core plate (20), and a plate (10) with a tube (10 A tube insertion hole (221) into which the end portion in the tube longitudinal direction (X) is inserted, and a cylindrical burring portion (26) protruding to one side at the inner peripheral edge of the tube insertion hole (221). ) To form the core plate (20), and after the core plate manufacturing process, the end of the tube (10) in the tube longitudinal direction (X) is An assembly step of inserting and assembling the tube into the tube insertion hole (221) of the plate (20), and after the assembly step, a paste-like brazing material is placed on one side of the tip of the burring portion (26) A fourth feature is that it includes a material arranging step and a brazing step in which the assembly of the tube (10) and the core plate (20) is brazed integrally after the brazing material arranging step.

  Thus, after assembling the tube (10) and the core plate (20), the core plate (20) has an affinity for the one side surface at the tip of the burring portion (26) of the core plate (20). By supplying the paste-like brazing material, the molten brazing material is easily introduced into the gap between the tube (10) and the burring portion (26) in the brazing step. Thereby, brazing property can be improved. At the same time, it is possible to prevent the brazing material melted by the heat treatment from flowing out of the joints, so that it is not necessary to supply extra brazing material in advance. Therefore, it is possible to improve the brazing property while suppressing the amount of brazing material used.

  Moreover, in the manufacturing method of the heat exchanger of the said 3rd or 4th characteristic, you may arrange | position a brazing material facing the outer peripheral whole region of a tube (10) at a brazing material arrangement | positioning process.

  If it does in this way, since a tube (10) and a core plate (20) can be brazed reliably, it becomes possible to further improve brazability.

  Moreover, in the manufacturing method of the heat exchanger of the said 3rd or 4th characteristic, you may arrange | position a brazing material partially facing the outer periphery of a tube (10) at a brazing material arrangement | positioning process.

  In this way, the amount of brazing material used can be further reduced. Even when the brazing material is partially disposed facing the outer periphery of the tube (10), in the brazing process, the molten brazing material spreads over the entire outer periphery of the tube (10) at the joint due to capillary action. The brazing property can be sufficiently secured. Therefore, it is possible to further reduce the amount of brazing material used while ensuring brazing.

  Moreover, in the manufacturing method of the heat exchanger of the said 3rd or 4th characteristic, you may apply | coat a brazing material from the tube longitudinal direction (X) outer side in a tube (10) at a brazing material arrangement | positioning process.

  In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. In this embodiment, the heat exchanger according to the present invention is applied to an intercooler that cools intake air by exchanging heat between combustion air (intake air) sucked into the internal combustion engine and outside air (cooling air). It is. The intake air corresponds to the fluid of the present invention.

  FIG. 1 is a front view of a heat exchanger according to the first embodiment of the present invention. As shown in FIG. 1, the heat exchanger includes a substantially rectangular parallelepiped core portion 1, and the core portion 1 is configured by alternately laminating many tubes 10 and many corrugated fins 11 in the vertical direction. Has been. The stacking direction of the tube 10 and the corrugated fin 11 is hereinafter referred to as a tube stacking direction Y.

  The corrugated fin 11 is made of an aluminum alloy and is formed in a corrugated shape to promote heat exchange between the cooling air and the intake air.

  The tube 10 has a passage through which intake air flows, and is formed by bending or welding or brazing an aluminum alloy plate material into a predetermined shape.

  In the present embodiment, the tube 10 has a flat shape in which the longitudinal direction (hereinafter referred to as the tube longitudinal direction X) coincides with the horizontal direction and the cross-sectional shape thereof coincides with the flow direction of the cooling air in the major axis direction. Is formed. The direction orthogonal to both the tube stacking direction Y and the tube longitudinal direction X is hereinafter referred to as a tube width direction Z.

  At both ends of the tube 10 in the tube longitudinal direction X, tanks 2 extending in a direction substantially perpendicular to the tube longitudinal direction X and having a space formed therein are disposed. An end of the tube 10 in the longitudinal direction X of the tube 10 is joined to the tank 2 by being inserted into a tube insertion hole 221 (details will be described later), and the flow paths of the numerous tubes 10 communicate with the spaces in the tank 2. is doing. The tank 2 has an aluminum alloy core plate 20 in which a tube 10 and an insert 3 to be described later are inserted and fixed, and a resin tank main body 21 that forms a space in the tank 2 together with the core plate 20. Configured.

  Inserts 3 that reinforce the core 1 are disposed at both ends of the core 1 in the tube stacking direction Y. The insert 3 is made of an aluminum alloy, extends in a direction parallel to the tube longitudinal direction X, and both ends thereof are connected to the tank 2.

  2 is a plan view showing the core plate 20 of the first embodiment, and FIG. 3 is a cross-sectional view taken along the line AA of FIG. As shown in FIGS. 2 and 3, the core plate 20 has a tube joining surface 22 to which a tube is joined, and the end of the tank main body 21 is inserted around the tube joining surface 22. A shaped groove 20a is formed over the entire circumference.

  The groove 20a is formed by three surfaces. That is, an inner wall portion 23 that is bent substantially vertically from the outer peripheral portion of the tube joining surface 22 and extends in the tube longitudinal direction X, and a bottom wall portion 24 that is bent substantially vertically from the inner wall portion 23 and extends in the tube stacking direction Y. A groove 20 a is formed by the outer wall portion 25 that is bent substantially perpendicularly from the bottom wall portion 24 and extends in the tube longitudinal direction X.

  A number of tube insertion holes 221 into which the tube 10 is inserted and brazed are formed along the tube stacking direction Y on the tube joint surface 22 of the core plate 20. In addition, one insert insertion hole 222 into which the insert 3 is inserted and brazed is formed at each end of the tube joining surface 22 in the tube stacking direction Y.

  A burring portion 26 formed in a cylindrical shape is formed on the inner peripheral edge of the tube insertion hole 221 and the insert insertion hole 222 so as to protrude toward the inner side of the tank 2 (outer in the tube longitudinal direction X). . Further, the inner surface of the tank 2 at the tip of the burring portion 26 is a brazing material placement portion 26a where the paste-like brazing material 5 is placed in a brazing material placement step described later. The inner side of the tank 2 corresponds to one side of the present invention.

  Then, the manufacturing method of the intercooler concerning this 1st Embodiment is demonstrated.

  First, a plate-shaped member made of an aluminum alloy is prepared, and the plate-shaped member is subjected to burring to form a tube insertion hole 221 and an insert insertion hole 222, and a burring portion is formed on the inner peripheral edge of each of the insertion holes 221 and 222. 26 is formed (core plate manufacturing process). Further, the groove 20a is formed by bending the periphery of the plate-like member. Thereby, the core plate 20 is manufactured.

  Subsequently, after corrugated fins 11 are loaded between a plurality of tubes 10 arranged at predetermined intervals and the core portion 1 is temporarily assembled, the tubes 10 and inserts are inserted into the insertion holes 221 and 222 of the core plate 20. By inserting 3, the tube 10, the core plate 20, the corrugated fin 11, and the insert 3 are assembled (assembly process). Hereinafter, the tube 10, the core plate 20, the corrugated fin 11, and the insert 3 are also referred to as an assembly.

  4 is an enlarged cross-sectional view showing a joined state of the tube 10 and the core plate 20 in the first embodiment, and FIG. 5 is a plan view showing a joined state of the tube 10 and the core plate 20 in the first embodiment. FIG. 5 shows a state viewed from the inner side of the tank 2 (upper side of the drawing in FIG. 4).

  As shown in FIGS. 4 and 5, after the assembling process, the brazing filler metal 5 is disposed on the inner surface of the tank 2 at the brazing filler metal placement portion 26 a of the core plate 20, that is, at the tip of the burring portion 26. (Brazing material placement step). Here, the paste-like brazing material 5 is composed of an alloy powder, an organic solvent, and a binder. The paste-like brazing material 5 has an affinity with the core plate 5 and the tube 10.

  In the present embodiment, the brazing material 5 is disposed so as to face the entire outer periphery of the tube 10, that is, to surround the entire outer periphery of the tube 10. Further, the outer periphery of the tube 10 and the brazing material 5 are in contact with each other.

  Subsequently, the tube 10, the core plate 20, the corrugated fin 11, and the insert 3 are brazed by carrying the heat treatment by carrying the assembly in which the brazing material 5 is arranged in the brazing material arranging portion 26 b into the heating furnace. Are joined together (brazing process).

  Subsequently, the tank body 21 is caulked and fixed to the core plate 20.

As described above, the burring portion 26 is formed at the inner peripheral edge of each of the insertion holes 221 and 222, and after assembling the tube 10 and the core plate 20, one side of the distal end portion of the burring portion 26 of the core plate 20 is installed. By supplying a paste-like brazing material having an affinity for the core plate 20 to the surface (the brazing material arranging portion 26a), the molten brazing material is introduced into the gap between the tube 10 and the burring portion 26 during the heat treatment. Since it becomes easy, brazing property can be improved. Moreover, since it is possible to suppress the outflow of the brazing filler metal 5 melted by the heat treatment to other than the joined portion, it is not necessary to supply extra brazing filler metal 5 in advance. Accordingly, it is possible to improve the brazing performance while suppressing the amount of brazing material used. Further, the burring portion 26 is formed so as to protrude toward the inner side of the tank 2, and the burring portion 26 By setting the inner surface of the tank 2 at the front end to be the brazing material arranging portion 26a, it is possible to prevent the brazing material applying device and the corrugated fin 11 from interfering in the brazing material arranging step. Thereby, it becomes possible to arrange the brazing material 5 easily.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. The same parts as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted. FIG. 6 is an enlarged cross-sectional view showing a joined state of the tube 10 and the core plate 20 in the second embodiment, and corresponds to FIG.

  As shown in FIG. 6, on the inner peripheral edge of the tube insertion hole 221 and the insert insertion hole 222 in the core plate 20 of the present embodiment, on the outer side of the tank 2 (in the tube longitudinal direction X), that is, on the core part 1 side. A burring portion 26 formed in a cylindrical shape is formed so as to protrude toward the surface. On the side facing the tube 10 in the burring portion 26, an inclined surface 26 b is formed that is inclined with respect to a surface orthogonal to the tube longitudinal direction X and a surface parallel to the tube longitudinal direction X. The inclined surface 26b has an arc shape (R shape). A gap 27 is formed between the inclined surface 26 b of the burring portion 26 and the outer wall surface of the tube 10.

  In the brazing material arranging step, the paste-like brazing material 5 is arranged in the gap 27. At this time, it is sufficient that the brazing material 5 is supplied to at least the gap 27, and the brazing material 5 may protrude from the gap 27. In addition, the clearance gap 27 is equivalent to the brazing material arrangement | positioning part of this invention.

  As described above, the inclined surface 26b is formed on the core plate 20, and after the tube 10 and the core plate 20 are assembled, a paste-like brazing material having affinity with the core plate 20 is supplied, and the tube 10 is inclined. By disposing the brazing material 5 in the gap 27 formed between the surface 26b, the brazing material can be supplied directly to the joint between the tube 10 and the core plate 20. Therefore, the brazing material can be surely introduced into the joint portion between the tube 10 and the core plate 20, and the outflow of the brazing material to other than the joint portion can be further suppressed. Thereby, it becomes possible to further improve the brazing property while further reducing the amount of brazing material used.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG. The same parts as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted. FIG. 7 is an enlarged sectional view showing a joined state of the tube 10 and the core plate 20 in the third embodiment, and corresponds to FIG.

  As shown in FIG. 7, in the present embodiment, the distal end portion 26 b of the burring portion 26 is in a state of facing the radially outer side from the inner peripheral edge portion of each insertion hole 221, 222. Thereby, on the side facing the tube 10 in the vicinity of the distal end portion 26b of the burring portion 26, an inclined surface 26b that is inclined with respect to a surface orthogonal to the tube longitudinal direction X and a surface parallel to the tube longitudinal direction X is formed. Yes. The inclined surface 26b has an arc shape (R shape).

  A gap 27 is formed between the inclined surface 26 b of the burring portion 26 and the outer wall surface of the tube 10, and the brazing material 5 is arranged in the gap 27. In addition, the clearance gap 27 is equivalent to the brazing material arrangement | positioning part of this invention.

  Next, the core plate manufacturing process in this embodiment will be described.

  First, a burring process is performed on an aluminum alloy plate-shaped member to form tube insertion holes 221 and insert insertion holes 222, and a burring portion 26 is formed at the inner peripheral edge of each of the insertion holes 221 and 222. Thereafter, the burring portion 26 is punched. Specifically, the punch 26 has a diameter larger than each of the insertion holes 221 and 222 and has a tapered end facing the tip 26c of the burring portion 26. The tip 26c of the burring 26 is moved from one side to the other. Press toward the side. As a result, the burring portion 26 is crushed in the axial direction, and the tip end portion 26c of the burring portion 26 faces radially outward.

  Next, the brazing material arrangement process in this embodiment will be described.

  After the assembling step, the paste-like brazing material 5 is disposed in a gap 27 formed between the inclined surface 26b of the burring portion 26 and the outer wall surface of the tube 10. At this time, it is sufficient that the brazing material 5 is supplied to at least the gap 27, and the brazing material 5 may protrude from the gap 27.

  As described above, the inclined surface 26b is formed on the core plate 20, and after the tube 10 and the core plate 20 are assembled, a paste-like brazing material having affinity with the core plate 20 is supplied, and the tube 10 is inclined. By disposing the brazing material 5 in the gap 27 formed between the surface 26b, the brazing material can be supplied directly to the joint between the tube 10 and the core plate 20. Therefore, the brazing material can be surely introduced into the joint portion between the tube 10 and the core plate 20, and the outflow of the brazing material to other than the joint portion can be further suppressed. Thereby, it becomes possible to further improve the brazing property while further reducing the amount of brazing material used.

  Further, the burring portion 26 is formed so as to protrude toward the inner side of the tank 2, and the gap 27 between the inclined surface 26 b formed near the tip end portion 26 b of the burring portion 26 and the outer wall surface of the tube 10. By arranging the brazing material 5 in the brazing material arranging step, it is possible to prevent the brazing material application device and the corrugated fins 11 from interfering with each other. Thereby, it becomes possible to arrange the brazing material 5 easily.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described with reference to FIG. The same parts as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted. FIG. 8 is an enlarged cross-sectional view showing a joined state of the tube 10 and the core plate 20 in the fourth embodiment, and corresponds to FIG.

  As shown in FIG. 8, in this embodiment, the corner | angular part at the side which opposes the tube 10 in the front-end | tip part 26c of the burring part 26 has a chamfered shape. That is, an inclined surface 26 b that is inclined with respect to a surface orthogonal to the tube longitudinal direction X and a surface parallel to the tube longitudinal direction X is formed on the side of the distal end portion 26 c of the burring portion 26 that faces the tube 10. .

  A gap 27 is formed between the inclined surface 26 b of the burring portion 26 and the outer wall surface of the tube 10. In the brazing material arranging step, the paste-like brazing material 5 is arranged in the gap 27. At this time, it is sufficient that the brazing material 5 is supplied to at least the gap 27, and the brazing material 5 may protrude from the gap 27. In addition, the clearance gap 27 is equivalent to the brazing material arrangement | positioning part of this invention.

  As a result, the brazing material can be supplied directly to the joint between the tube 10 and the core plate 20. For this reason, while brazing material is reliably introduce | transduced into the junction part of the tube 10 and the core plate 20, the outflow to other than a junction part of a brazing material can be suppressed more. Therefore, it is possible to further improve the brazing property while further reducing the amount of brazing material used.

  Further, since the brazing material 5 is arranged on the inner side of the tank 2 in the core plate 20, it is possible to prevent the brazing material application device and the corrugated fins 11 from interfering in the brazing material arranging step. Thereby, it becomes possible to arrange the brazing material 5 easily.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described with reference to FIG. The same parts as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted. FIG. 9 is an enlarged cross-sectional view showing a joined state of the tube 10 and the core plate 20 in the fifth embodiment, and corresponds to FIG.

  As shown in FIG. 9, in this embodiment, the burring portion is not provided on the tube joint surface 22 of the core plate 20, and the inner side of the tank 2 at the inner peripheral edge of each insertion hole 221, 222 of the core plate 20. The corners on the side (outside of the tube longitudinal direction X) are chamfered. That is, on the inner side of the tank 2 at the inner peripheral edge of each insertion hole 221, 222, an inclined surface 26b is formed which is inclined with respect to a surface orthogonal to the tube longitudinal direction X and a surface parallel to the tube longitudinal direction X. Has been.

  A gap 27 is formed between the inclined surface 26 b of the core plate 20 and the outer wall surface of the tube 10. In the brazing material arranging step, the paste-like brazing material 5 is arranged in the gap 27. At this time, the brazing material 5 may be supplied to at least the gap 27, and the brazing material 5 may protrude from the gap 27. In addition, the clearance gap 27 is equivalent to the brazing material arrangement | positioning part of this invention.

  As a result, the brazing material can be supplied directly to the joint between the tube 10 and the core plate 20. For this reason, while brazing material is reliably introduce | transduced into the junction part of the tube 10 and the core plate 20, the outflow to other than a junction part of a brazing material can be suppressed more. Therefore, it is possible to further improve the brazing property while further reducing the amount of brazing material used.

  Further, since the brazing material 5 is arranged on the inner side of the tank 2 in the core plate 20, it is possible to prevent the brazing material application device and the corrugated fins 11 from interfering in the brazing material arranging step. Thereby, it becomes possible to arrange the brazing material 5 easily.

(Other embodiments)
In each of the above-described embodiments, the brazing material 5 has been described so as to face the entire outer periphery of the tube 10. However, the present invention is not limited thereto, and the brazing material 5 faces the outer periphery of the tube 10 as shown in FIG. 10. You may arrange | position partially. Thereby, the usage-amount of the brazing material 5 can be reduced more. Even when the brazing material 5 is partially disposed facing the outer periphery of the tube 10, the brazing material melted in the brazing step spreads over the entire outer periphery of the tube 10 at the joint due to the capillary phenomenon. Sufficient sex can be secured. Therefore, it is possible to further reduce the amount of brazing material used while ensuring brazing.

  In the first, third, and fourth embodiments, the burring portion 26 is described so as to protrude toward the inner side of the tank 2 (the tube longitudinal direction X outer side). Not limited to this, it may be formed so as to protrude toward the outer side of the tank 2 (inner side in the tube longitudinal direction X).

  In the second embodiment, the example in which the burring portion 26 is formed so as to protrude toward the outer side of the tank 2 (inner side in the tube longitudinal direction X) has been described. You may form so that it may protrude toward the inner side (tube longitudinal direction X outer side).

  Moreover, although the said 5th Embodiment demonstrated the example which chamfered the corner | angular part of the inner side (tube longitudinal direction X outer side) of the tank 2 in the inner peripheral edge part of each insertion hole 221 and 222 of the core plate 20, Not only this but the corner | angular part of the outer side (tube longitudinal direction X inner side) of the tank 2 in the inner peripheral edge part of each insertion hole 221,222 of the core plate 20 may be chamfered.

  Moreover, although the said 2nd-5th embodiment demonstrated the example which has arrange | positioned the brazing material 5 in the clearance gap 27 formed between the inclined surface 26b of the core plate 20, and the outer wall surface of the tube 10, Not limited to this, in the brazing step, the brazing material 5 may be disposed in another part of the core plate 20 as long as the brazing material 5 melted by the heat treatment enters the gap 27. In addition, the brazing material 5 may be disposed in a gap 27 formed between the inclined surface 26 b of the core plate 20 and the outer wall surface of the tube 10, and may be disposed in other portions of the core plate 20. .

  Moreover, in the said 4th Embodiment, although the corner | angular part of the side which opposes the tube 10 in the front-end | tip part 26c of the burring part 26 was made into the linear chamfering shape, it is not restricted to this but is made into circular arc shape (R shape) Also good.

  Moreover, in the said 5th Embodiment, although the corner | angular part of the inner peripheral edge part of each insertion hole 221 and 222 in the core plate 20 was made into the linear chamfering shape, it is not restricted to this, It is set as circular arc shape (R shape) Also good.

  In each of the above embodiments, the present invention is applied to an intercooler. However, the present invention is not limited to this, and is also applied to other heat exchangers such as a radiator, a condenser, and an oil cooler. can do.

It is a front view of the heat exchanger which concerns on 1st Embodiment. It is a top view which shows the core plate 20 of 1st Embodiment. It is AA sectional drawing of FIG. It is an expanded sectional view showing the joined state of tube 10 and core plate 20 in a 1st embodiment. It is a top view which shows the joining state of the tube 10 and the core plate 20 in 1st Embodiment. It is an expanded sectional view showing the joined state of tube 10 and core plate 20 in a 2nd embodiment. It is an expanded sectional view showing the joined state of tube 10 and core plate 20 in a 3rd embodiment. It is an expanded sectional view showing the joined state of tube 10 and core plate 20 in a 4th embodiment. It is an expanded sectional view showing the joined state of tube 10 and core plate 20 in a 5th embodiment. It is a top view which shows the joining state of the tube 10 and the core plate 20 in other embodiment. It is an expanded sectional view showing the joined state of conventional tube J10 and core plate J20.

Explanation of symbols

  2 ... tank, 10 ... tube, 20 ... core plate, 21 ... tank body, 22 ... tube joint surface, 26 ... burring part, 26a ... brazing material placement part, 26b ... inclined surface, 27 ... gap, 221 ... tube insertion hole.

Claims (9)

A plurality of tubes (10) through which fluid flows;
A core plate (20) that is provided at both ends of the tube (10) in the tube longitudinal direction (X) and to which the tube (10) is joined, and a tank body that constitutes a tank internal space together with the core plate (20) A tank (2) having a portion (21),
After the tube (10) is inserted and assembled into the tube insertion hole (221) of the tube joining surface (22) of the core plate (20), the tube longitudinal direction (X) end of the tube (10) is assembled. ) And the core plate (20), a paste-like brazing material is disposed in the brazing material disposition portion, and then the assembly of the tube (10) and the core plate (20) is heat-treated and integrated. A heat exchanger brazed to
The inner peripheral edge of the tube insertion hole (221) is inclined with respect to the surface perpendicular to the tube longitudinal direction (X) and the surface parallel to the tube longitudinal direction (X) of the core plate (20). An inclined surface (26b) is formed,
The heat exchanger, wherein the brazing material melted by the heat treatment enters a gap (27) formed between the tube (10) and the inclined surface (26b). The heat exchanger according to claim 1, wherein the gap (27) formed between the tube (10) and the inclined surface (26b) serves as the brazing material arrangement portion. A plurality of tubes (10) through which fluid flows;
A core plate (20) that is provided at both ends of the tube (10) in the tube longitudinal direction (X) and to which the tube (10) is joined, and a tank body that constitutes a tank internal space together with the core plate (20) A tank (2) having a portion (21),
After the tube (10) is inserted and assembled into the tube insertion hole (221) of the tube joining surface (22) of the core plate (20), the tube longitudinal direction (X) end of the tube (10) is assembled. ) And the core plate (20), a paste-like brazing material is arranged in the brazing material arrangement part (26a), and then the assembly of the tube (10) and the core plate (20) is heat-treated. A heat exchanger that is brazed together,
A cylindrical burring portion (26) protruding to one side is formed on the inner peripheral edge of the tube insertion hole (221),
The heat exchanger according to claim 1, wherein the one-side surface of the tip of the burring portion (26) is the brazing material arrangement portion (26a). A plurality of tubes (10) through which fluid flows;
A core plate (20) that is provided at both ends of the tube (10) in the tube longitudinal direction (X) and to which the tube (10) is joined, and a tank body that constitutes a tank internal space together with the core plate (20) A heat exchanger comprising a tank (2) having a portion (21),
A tube insertion hole (221) into which an end portion of the tube longitudinal direction (X) in the tube (10) is inserted is formed in the plate-shaped member, and the inner periphery of the tube insertion hole (221) is The core plate (20) is formed by forming an inclined surface (26b) that is inclined with respect to a surface orthogonal to the tube longitudinal direction (X) and a surface parallel to the tube longitudinal direction (X). Core plate manufacturing process for manufacturing)
After the core plate manufacturing step, an assembly step of inserting and assembling the tube longitudinal direction (X) end of the tube (10) into the tube insertion hole (221) of the core plate (20);
After the assembling step, a brazing material arranging step of arranging a paste-like brazing material at the joint between the tube (10) and the core plate (20);
A brazing step of brazing the tube (10) and the core plate (20) together by heat treatment after the brazing material disposing step;
In the brazing step, the brazing material melted by the heat treatment enters a gap (27) formed between the tube (10) and the inclined surface (26b). A method of manufacturing a heat exchanger. The said brazing material arrangement | positioning process WHEREIN: The said brazing material is arrange | positioned in the said clearance gap (27) formed between the said tube (10) and the said inclined surface (26b). Manufacturing method of heat exchanger. A plurality of tubes (10) through which fluid flows;
A core plate (20) that is provided at both ends of the tube (10) in the tube longitudinal direction (X) and to which the tube (10) is joined, and a tank body that constitutes a tank internal space together with the core plate (20) A heat exchanger comprising a tank (2) having a portion (21),
A tube insertion hole (221) into which an end portion of the tube longitudinal direction (X) in the tube (10) is inserted is formed in the plate member, and an inner peripheral edge portion of the tube insertion hole (221) is A core plate manufacturing process for manufacturing the core plate (20) by forming a cylindrical burring portion (26) protruding to the side;
After the core plate manufacturing step, an assembly step of inserting and assembling the tube longitudinal direction (X) end of the tube (10) into the tube insertion hole (221) of the core plate (20);
After the assembling step, a brazing material disposing step of disposing a paste-like brazing material on the one side surface at the tip of the burring portion (26);
And a brazing step of brazing the assembly of the tube (10) and the core plate (20) by heat treatment after the brazing material disposing step. . The method for manufacturing a heat exchanger according to any one of claims 4 to 6, wherein, in the brazing material arranging step, the brazing material is arranged to face the entire outer periphery of the tube (10). . The heat exchanger according to any one of claims 4 to 6, wherein in the brazing material arranging step, the brazing material is partially arranged so as to face the outer periphery of the tube (10). Production method. The heat exchanger according to any one of claims 4 to 8, wherein, in the brazing material arranging step, the brazing material is applied from the outside in the tube longitudinal direction (X) of the tube (10). Manufacturing method.

Images