JP2007205585A - Manufacturing method of heat exchanger, and heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a heat exchanger, and the heat exchanger manufactured by the method, capable of improving brazing property of a core plate and a tube without impairing heat exchanging performance. <P>SOLUTION: As the core plate 111 is retracted to the direction to keep an edge portion 111b away from a core portion 120, a linear tip portion of a dispenser 200 can enter deeply to a position indicated by a two-dot chain line in the thickness direction of the core portion 120 as shown in (b). Thus paste brazing filler metal can be applied to a comparatively wide range of a joining part 122b of the core plate 111 and the tube 122 without reducing an installation area of a fin 121. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a heat exchanger manufacturing method in which a plurality of tubes constituting a core portion are brazed to a core plate, and a heat exchanger formed by the manufacturing method.

  As a prior art, there is a heat exchanger disclosed in Patent Document 1 below. This heat exchanger includes a core part (heat exchange part) in which tubes and fins are alternately stacked, and a pair of header tanks communicating with the tube of the core part.

  The header tank is composed of a tank body and a core plate, and the core plate is a box-shaped member whose opening side is fitted to the tank body. And the edge part of a tube is inserted and brazed and joined to the tube insertion hole provided in the flat plate-shaped part which makes the bottom face of a box-shaped member.

  The brazing joint between the core plate and the tube is performed by the following procedure.

First, a paste-like brazing material is applied in advance in the vicinity of the tube insertion hole of the core plate. Next, the tube end is inserted into the tube insertion hole of the core plate to temporarily fix the core plate and the tube. Finally, the temporarily fixed body is heated, the molten brazing material is poured into the contact portion between the core plate and the tube, and the core plate and the tube are brazed and joined.
JP-A-2005-118826

  However, in the above-described conventional brazing method for forming a heat exchanger, since the paste-like brazing material is applied to the core plate in advance, the brazing material falls off when the tube is temporarily fixed to the tube insertion hole of the core plate. May end up. In addition, since the paste-like brazing material is applied in the vicinity of the tube insertion hole of the core plate, there are cases where the brazing joint portion between the core plate and the tube cannot be sufficiently rotated during heat brazing. In any of these cases, there is a problem that the brazing property between the core plate and the tube is lowered.

  As a countermeasure for the above problem, the present inventors have studied a method of directly applying a paste-like brazing material to the brazing portion after temporarily fixing the core plate and the tube. And it became clear that it is not easy to apply a paste-like brazing material to a brazing portion between a core plate and a tube in a coating apparatus having a linear tip such as a general dispenser.

  For example, as shown in FIG. 11, when the core portion 920 has a configuration in which the fins 921 are arranged between the laminated tubes 922, the dispenser 200 having a linear tip portion interferes with the fins 921, so the thickness of the core portion 920 In the direction, there is a problem that a portion where it is difficult to apply the paste-like brazing material is generated at the brazed joint portion between the core plate 911 and the tube 922 (it can be applied only to a very small part).

  This inconvenience can be solved by greatly separating the end of the fin 921 from the core plate 911. However, if the end portion of the fin 921 is greatly separated from the core plate 911, the arrangement area of the fin 921 is reduced, so that the heat exchange performance of the heat exchanger is deteriorated.

  The present inventors have intensively studied the configuration of the brazing part, etc., and if the shape of the core plate is devised, the brazed joint part between the core plate and the tube is pasted without reducing the heat exchange performance. It has been found that it is possible to easily apply a brazing material to improve brazing properties.

  The present invention has been made in view of the above points, and a heat exchanger manufacturing method and a manufacturing method thereof capable of improving the brazing property between a core plate and a tube without deteriorating heat exchange performance It aims at providing the heat exchanger formed by.

In order to achieve the above object, in the method of manufacturing a heat exchanger according to claim 1,
A core portion (120) having a plurality of stacked tubes (122) and fins (121) disposed between the plurality of tubes (122);
The core plate (111) joined to the plurality of tubes (122) constitutes the bottom surface (110b) on the core portion (120) side of the internal space (110a), and the internal space (110a) is composed of the plurality of tubes (122 And a header tank (110) communicating with the inside of the heat exchanger,
Temporary fixing for temporarily fixing the core portion (120) and the core plate (111) by inserting the end portions (122a) of the plurality of tubes (122) into the insertion holes (111a) of the core plate (111). Process,
After the temporary fixing step, the application step of applying the paste brazing material (210) to the portion (122b) where the core plate (111) and the tube (122) are joined with the application device (200) having the straight tip portion. When,
After the application step, the step of heating the temporarily fixed body of the core portion (120) and the core plate (111), and a joining step of brazing and joining the core plate (111) and the tube (120),
In the temporary fixing step, the core plate (111) in which the edge portion (111b) in the direction orthogonal to the core portion (120) forming surface of the bottom surface (110b) is set back with respect to the center side of the core portion (120) is temporarily fixed. It is characterized by that.

  According to this, the surface (110b) on the core part (120) side of the core plate (111) is in a direction in which the edge part (111b) in the direction orthogonal to the core part (120) formation surface is away from the core part (120). Retreating. Therefore, using the space formed by the retreat of the edge (111b), in the coating process, the linear tip of the coating device (200) is perpendicular to the core (120) forming surface (core thickness). The paste brazing material (210) can be applied to the portion (122b) where the core plate (111) and the tube (122) are joined.

  That is, the paste-like brazing material (210) is easily applied to the portion (122b) where the core plate (111) and the tube (122) are joined while preventing the interference with the fin (121) between the tubes (122). can do. In this way, it is possible to improve the brazability between the core plate (111) and the tube (122) without deteriorating the heat exchange performance.

In the invention according to claim 2,
In the temporary fixing step, the core plate (111) having an inclined surface (111d) inclined toward the insertion direction of the tube (122) around the insertion hole (111a) is temporarily fixed.
The coating step is characterized in that a paste brazing material (210) is applied between the inclined surface (111d) of the core plate (111) and the tube (122).

  According to this, in the temporary fixing step, the tube (122) end (122a) can be easily inserted into the insertion hole (111a) using the inclined surface (111d) as a guide. In the application process, since the paste brazing material (210) is applied between the inclined surface (111d) and the tube (122), the gap between the core plate (111) and the tube (120) in the joining process is applied. The brazing property is good and the brazing property can be further improved.

  Further, the invention according to claim 3 is characterized in that the tube (122) is a tube having a flat cross section.

  In the core part (120) in which a plurality of flat tubes (122) are stacked, the part (122b) for brazing and joining the core plate (111) and the tube (120) is perpendicular to the surface on which the core part (120) is formed. It tends to be long. Therefore, it is very effective to apply the present invention to the manufacture of the heat exchanger (100) having the core part (120) in which the flat tubes (122) are laminated.

  The invention according to claim 4 is characterized in that, in the temporary fixing step, at least the core plate (111) and the tube (122) whose surfaces are made of copper, copper alloy or Ni are temporarily fixed.

  When the material to be joined is made of a copper material, the strength reduction of the copper material increases as the heating temperature in the joining process increases. Therefore, when at least the surfaces of the core plate (111) and the tube (122) are made of copper, copper alloy, or Ni, if the present invention is applied, the paste brazing material (210) is used for joining. It is possible to suppress the heating temperature in the process.

  Specifically, as in the invention described in claim 5, it is preferable to apply a paste brazing material (210) having a melting point of 550 to 700 ° C. in the application step.

  This is because it is difficult to obtain a sufficient brazing joint strength with a brazing material having a melting point of less than 550 ° C., and the strength reduction of the material to be joined becomes large at a heating temperature corresponding to the brazing material with a melting point exceeding 700 ° C. . Moreover, since the copper-based brazing material having a melting point of 550 to 700 ° C. is brittle and difficult to clad on the surface of the material to be joined, a paste-like brazing material (210) having a melting point of 550 to 700 ° C. should be adopted. Is preferred.

In the invention according to claim 6,
In the joining step, the temporary fixing body is heated in a posture in which the core (120) forming surface is substantially horizontal,
The application step is characterized in that the paste-like brazing material (210) is applied only to the upper side from the center in the position of the bonding step in the portion (122b) where the core plate (111) and the tube (122) are bonded. .

  According to this, even if the paste-like brazing material (210) is not applied to the entire region (122b) where the core plate (111) and the tube (122) are joined in the coating step, the portion to be joined in the joining step. The brazing material applied on the upper side of (122b) can be supplied to the lower side, and stable brazing can be ensured in the entire region (122b) to be joined.

In the invention according to claim 7,
The linear expansion coefficient of the core plate (111) is set to be smaller than the linear expansion coefficient of the tube (122).

  As a result, the tube (122) is relatively close to the core plate (111) side during brazing due to the difference in linear expansion of both members (111, 122), so that the gap between the members (122, 111) is reduced. It is possible to improve the solderability.

In the heat exchanger of the invention according to claim 8,
A core portion (120) having a plurality of stacked tubes (122) and fins (121) disposed between the plurality of tubes (122);
The core plate (111) joined to the plurality of tubes (122) constitutes the bottom surface (110b) on the core portion (120) side of the internal space (110a), and the internal space (110a) is composed of the plurality of tubes (122 And a header tank (110) communicating with the inside
The core plate (111) and a plurality of tubes (122) having end portions (122a) inserted into the insertion holes (111a) of the core plate (111) are brazed by the paste brazing material (210). A joined heat exchanger,
The core plate (111) is characterized in that an edge portion (111b) in a direction orthogonal to the core portion (120) forming surface of the bottom surface (110b) is set back with respect to the center side of the core portion (120). .

  This heat exchanger can be manufactured by the manufacturing method according to the first aspect of the present invention. Therefore, it is possible to improve the brazing property between the core plate (111) and the tube (122) without deteriorating the heat exchange performance.

  In addition, the code | symbol in the parenthesis attached | subjected to each said means is an example which shows a corresponding relationship with the specific means as described in embodiment mentioned later.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  In this embodiment, the present invention is applied to an intercooler 100 that is a heat exchanger that cools air pressurized by a supercharger before being sucked into the engine. FIG. 1 is a schematic front view showing the overall configuration of the intercooler 100, and FIG. 2 is a cross-sectional view taken along line AA of the intercooler 100 shown in FIG. In FIG. 1, only a part of the core unit 120 described later is illustrated.

  As shown in FIG. 1, the intercooler 100 includes a core part 120 and a pair of left and right header tanks 110 in the drawing.

  In the core portion 120, a plurality of heat radiation fins 121 and tubes 122 are alternately stacked, and a side plate 124 as a strength member is assembled to the outer side of the outermost heat radiation fins 121 in the upper and lower sides in the drawing, and integrated. It is brazed with.

  Header tanks 110 extending in the direction intersecting with the longitudinal direction are respectively arranged in the left and right portions of the core portion 120 in the drawing, that is, at both longitudinal ends of the plurality of tubes 122 so as to communicate with the inside of the tube 122. As shown in FIG. 2, both end portions 122 a of the plurality of tubes 122 are inserted into the insertion holes 111 a of the core plate 111 and are brazed.

  Inner fins (not shown) are brazed and joined to the flat tube 122, and heat radiation fins 121 are brazed and joined to the outer surface of the tube 122.

  The heat dissipating fins 121 and the inner fins (not shown) are made of a copper material due to heat conduction characteristics and the like, and the tube 122 and the side plate 124 are made of a copper alloy material due to strength characteristics and heat conduction characteristics.

  Each of the header tanks 110 on the left and right in FIG. 1 includes a core plate 111 made of a copper alloy plate, a tank part (tank main body part) 112, and a bottom part not shown. The core plate 111 and the tank part (tank main body part) ) 112 and the like are joined by brazing or welding to form a hollow structure.

  The core plate 111 or the like is only required to have at least a surface made of copper, a copper alloy material, or a Ni material. For example, the core plate 111 may be made of a member obtained by performing copper plating on the surface of a stainless material to improve strength characteristics and the like. Good.

  In the header tank 110 on the right side in FIG. 1, an inlet joint 113 is provided so as to communicate with the header tank 110. On the other hand, an outlet joint 114 is provided in the header tank 110 on the left side in the drawing so as to communicate with the inside of the header tank 110. The inlet joint 113 is connected to a discharge side of a supercharger (not shown), and the outlet joint 114 is connected to an intake side of an engine (not shown).

  The inlet joint 113 is an inlet in the present embodiment for introducing air into the header tank 110 on the right side, and the outlet joint 114 is a book for leading air out of the header tank 110 on the left side. It is the outlet in the embodiment.

  As the header tanks 110 are located farther from the joints 113 and 114, the cross-sectional area of the tank internal space 110a, which will be described later, gradually decreases, so that air can be distributed substantially uniformly to the plurality of tubes 122 of the core part 120. It has become.

  A stay 130 for attaching the intercooler 100 to the vehicle structural member is joined to the outer surfaces of the header tanks 110.

  Each member constituting the core part 120 is assembled and temporarily fixed together with the core plate 111 by fitting, jig fixing, etc., and then integrally brazed with a paste-like brazing material applied at a predetermined position. Is done. Thereafter, the tank portion 112 and the like are welded to the core plate 111 to form the intercooler 100.

  In the present invention, the joining structure and joining method between the core plate 111 and the tube 122 are characterized, and the details thereof will be described below with reference to FIGS.

  Here, FIG. 3 is a view of the joint portion between the core plate 111 and the tube 122 as seen from the right side of FIG. 4 is a cross-sectional view by process of the joint portion between the core plate 111 and the tube 122, and FIG. 5 is a cross-sectional view by process in the cross section taken along the line BB of FIG.

  As shown in FIG. 2, the core plate 111 according to the present embodiment includes an edge portion 111 b in a direction (vertical direction in the drawing) orthogonal to the surface on which the core portion 120 is formed, of the portion forming the core portion 120 side bottom surface 110 b of the header tank 110. Is inclined and recedes with respect to the center side of the core part 120.

  The end 122 a of the tube 122 is inserted into the insertion hole 111 a extending to the edge 111 b of the core plate 111 and brazed with the brazing material 220.

  Next, a method for brazing the core plate 111 and the tube 122 will be described.

  As shown in FIG. 4A, first, the end portion 122a of the tube 122 is inserted into the insertion hole 111a of the core plate 111, and the core portion 120 and the core plate 111 are temporarily fixed.

  As shown in FIG. 5A, the core plate 111 has a burring portion 111c around the tube insertion hole 111a by burring. Thus, an inclined surface 111d that is inclined toward the insertion direction of the tube 122 is formed around the tube insertion hole 111a.

  Therefore, when the end 122a of the tube 122 is inserted into the core plate 111 tube insertion hole 111a, the end 122a is guided by the inclined surface 111d and can be easily inserted.

  The process shown in FIG. 4A and FIG. 5A is a temporary fixing process in the present embodiment.

  If the core part 120 and the core plate 111 are temporarily fixed as described above, then the core plate 111 and the tube 122 are joined using the dispenser 200 which is a coating apparatus, as shown in FIG. A paste-like brazing material 210 (see FIG. 5B) is applied to the portion 122b.

  Here, the tip of the dispenser 200 has a linear shape (straight tubular). This is because a general-purpose dispenser is employed as the coating apparatus in the present embodiment.

  Since the core plate 111 in which the edge portion 111b is retracted in the direction away from the core portion 120 is adopted as the temporarily fixed body between the core plate 111 and the core portion 120 temporarily fixed in the temporary fixing step, the core plate 111 A space for allowing the dispenser 200 to enter is formed between the radiating fin 121 and the radiating fin 121.

  Therefore, as shown in FIG. 4 (b), the linear tip portion of the dispenser 200 is positioned at a position indicated by a two-dot chain line in a direction (core portion 120 thickness direction, vertical direction in the figure) perpendicular to the core portion 120 formation surface. It can be made to penetrate deeply. As a result, as shown by the alternate long and short dash line in FIG. 6, the paste-like brazing material 210 (see FIG. 5B) can be applied over a relatively wide area 122 b where the core plate 111 and the tube 122 are joined.

  The process shown in FIG. 4B and FIG. 5B is a coating process in this embodiment.

  In this application step, as shown in FIG. 5B, a paste-like brazing material 210 is applied between the inclined surface 111d of the core plate 111 burring portion 111c and the outer peripheral surface of the tube 122.

  The paste-like brazing material 210 applied here is a mixture of an alloy powder made of copper (Cu) -tin (Sn) -nickel (Ni) -phosphorus (P) and an organic polymer binder. Incidentally, the weight ratio of each component of the metal powder is, for example, 75% copper, 15% tin, 5% nickel, 5% phosphorus, and the melting point of the brazing material is about 600 ° C.

  When the paste-like brazing material 210 is applied between the inclined surface 111d of the core plate 111 and the tube 122 as described above, the temporarily fixed body between the core portion 120 and the core plate 111 is heated, and FIG. As shown in FIG. 5 (c), the core plate 111 and the tube 120 are brazed and joined with a brazing material 220.

  The process shown in FIG.4 (c) and FIG.5 (c) is a joining process in this embodiment.

  This joining process is performed in a brazing furnace in a reducing gas atmosphere (not shown). The temporarily fixed body of the core part 120 and the core plate 111 has a posture in which the core part 120 forming surface is substantially horizontal (an attitude in which the longitudinal direction of the tube 122 is substantially horizontal) and is applied in the coating process. It puts in a brazing furnace so that it may become above the center among the parts 122b which 210 joins.

Here, for example, hydrogen (H ₂ ) is introduced as a reducing gas into the brazing furnace, and the temporarily fixed body is heated under a temperature condition of 600 to 800 ° C.

  As a result, the oxide film on the surface of the material to be joined such as the core plate 111 and the tube 122 is reliably removed by phosphorus (P) and the reducing gas in the brazing material. Then, the paste-like brazing material 210 applied only to the upper side from the center of the portion 122b where the core plate 111 and the tube 122 are joined is melted, and the paste-like brazing material is applied among the portions 122b to be joined due to the capillary effect. The lower side that was not present is also filled with brazing material.

  In the application process, since the paste brazing material 210 is applied between the inclined surface 111d of the core plate 111 and the tube 122, the brazing property between the core plate 111 and the tube 120 in the joining process is extremely good.

  Further, in the core plate 111 and the tube 122 that are temporarily fixed in the temporary fixing step, the linear expansion coefficient of the core plate 111 is set smaller than the linear expansion coefficient of the tube 122.

  Therefore, in the joining process, the tube 122 is relatively close to the core plate 111 side during brazing heating due to the difference in linear expansion between the two members 111 and 122, so that the gap between the two members 122 and 111 can be reduced. , Brazing can be improved.

  According to the above-described configuration and manufacturing method, by adopting the core plate 111 in which the edge portion 111b of the portion forming the bottom surface 110b on the side of the core space 120a on the side of the core portion 120b recedes from the center side of the core portion 120, In addition, the dispenser 200 having the straight tip portion hardly interferes with the heat dissipating fins 121 between the tubes 122.

  Therefore, even if the arrangement area of the radiation fins 121 is not reduced, the space formed by the retreated edge portion 111b of the core plate 111 is used to relatively reduce the portion 122b where the core plate 111 and the tube 122 are joined. The paste-like brazing material 210 can be easily applied to a wide area. Further, since the paste-like brazing material application step is performed after the temporary fixing step, the paste-like brazing material does not fall off during the temporary fixing. Thus, the brazing property between the core plate 111 and the tube 122 can be improved without reducing the heat exchange performance.

  The core plate 111 and the tube 122 have at least surfaces made of copper, copper alloy, or Ni. The present invention can be applied even if the material to be joined is a heat exchanger made of another metal material. However, from the required characteristics such as high-temperature pressure resistance, etc., in this embodiment, at least the surface of the material to be joined made of a copper-based material. Is adopted.

  When the material to be joined is made of a copper-based material, the strength reduction of the copper-based material increases as the heating temperature in the joining process increases. On the other hand, in this embodiment, the heating temperature in a joining process is suppressed by employ | adopting the paste-like brazing material 210 with a comparatively low melting point.

  The pasty brazing material to be used preferably has a melting point of 550 to 700 ° C. This is because it is difficult to obtain sufficient brazing joint strength with a brazing material having a melting point of less than 550 ° C., and when the brazing material having a melting point of more than 700 ° C. is used as a heating temperature for reliably melting, the strength of the joined material is greatly reduced. It is to become. Moreover, since the copper-based brazing material having a melting point of 550 to 700 ° C. is brittle and difficult to clad on the surface of the material to be joined, it is preferable to employ a paste-like brazing material having a melting point of 550 to 700 ° C.

  In the joining process, the temporarily fixed body is heated in a posture in which the surface on which the core part 120 is formed is substantially horizontal, and in the coating step, the portion 122b that joins the core plate 111 and the tube 122 is centered in the joining step posture. Paste brazing material 210 is applied only on the upper side.

  Therefore, even if the paste brazing material 210 is not applied to the entire region 122b where the core plate 111 and the tube 122 are joined in the coating process, the brazing material applied on the upper side of the site 122b to be joined is lowered. Stable brazing property can be ensured over the entire region 122b to be joined.

  Moreover, since the paste-like brazing material 210 is not applied below the center of the portion 122b where the core plate 111 and the tube 122 are joined, the brazing material is less likely to drop below the joining portion 122b. That is, not only can the brazing property of the joint portion 122b between the core plate 111 and the tube 122 be improved, but also the amount of brazing material to be applied can be reduced. Furthermore, the number of man-hours for the coating process can be reduced as compared with the case where a paste-like brazing material is applied over substantially the entire bonding portion 122b.

(Other embodiments)
In the above-described embodiment, the paste-like brazing material 210 is applied only on the upper side of the center in the posture of the bonding step in the portion 122b where the core plate 111 and the tube 122 are bonded, but it is applied to both sides. May be.

  Further, in the above-described embodiment, the core plate 111 has both the edge portions 111b in the direction perpendicular to the core portion 120 forming surface among the portions forming the core portion 120 side bottom surface 110b of the header tank 110, and the core plate 111 is inclined. Although the shape which goes away with respect to the center side of the part 120 was made, it is not limited to this shape.

  What is necessary is just to retreat with respect to the center side of a core part, so that a core plate goes to an edge part from a center part in the core part thickness direction. For example, as shown in FIG. 7, the cross-sectional shape of the portion forming the core part 120 side bottom surface 310b of the core plate 311 may be a substantially arc shape, or as shown in FIG. The cross-sectional shape of the part forming the core portion 120 side bottom surface 410b may be a substantially triangular shape (a shape constituted by only a pair of inclined surfaces).

  Further, when the paste-like brazing material 210 is applied only to the upper side from the center of the portion where the core plate and the tube are joined, the edge of the core plate is the core portion on the side where the paste-like brazing material 210 is applied. Any shape may be used as long as it is away from the center side of 120. For example, as shown in FIG. 9, a core plate 511 in which only the upper edge portion 511b to which the paste-like brazing material 210 is applied is retreated from the center side of the core portion 120 may be employed, or as shown in FIG. . You may employ | adopt the core plate 611 which made the upper edge part 611b larger the degree of retreat (degree of inclination) than the degree of retreat of the lower edge part 611c.

  In the above embodiment, the inclined surface 111d is formed around the tube insertion hole 111a of the core plate 111 by burring, but the formation of the inclined surface is not limited to burring. For example, it may be formed by chamfering or the like.

  In the above-described embodiment, the tube 122 is a so-called flat tube having a flat cross section, but is not limited thereto. For example, a tube having a circular cross section may be used. However, as in the above-described embodiment, in the core part 120 in which the plurality of flat tubes 122 are stacked, the portion 122b where the core plate 111 and the tube 120 are brazed and joined is perpendicular to the surface on which the core part 120 is formed (core It tends to be longer in the thickness direction. Therefore, it is very effective to apply the present invention to the heat exchanger 100 having the core portion 120 in which the flat tubes 122 are laminated.

  Moreover, as long as a fin is arrange | positioned between tubes, a tube and a fin are not limited to what is laminated | stacked alternately, For example, the structure which a tube penetrates a plate fin may be sufficient.

  Moreover, in the said one Embodiment, although demonstrated using the intercooler 100 as a heat exchanger, not only this but this invention may be applied to an oil cooler etc. as another heat exchanger.

It is a schematic front view which shows the whole structure of the intercooler 100 which is a heat exchanger in one Embodiment to which this invention is applied. It is the sectional view on the AA line in FIG. It is the figure which looked at the junction part of the core plate 111 and the tube 122 from the right side of FIG. (A), (b), (c) is principal part sectional drawing according to a process. (A), (b), (c) is sectional drawing according to process in the BB sectional view of FIG. It is a figure which shows the application | coating area | region of a paste-form brazing material. It is principal part sectional drawing in other embodiment. It is principal part sectional drawing in other embodiment. It is principal part sectional drawing in other embodiment. It is principal part sectional drawing in other embodiment. It is sectional drawing which shows an example of the application | coating process of the paste-form brazing material in manufacture of the conventional heat exchanger.

Explanation of symbols

100 intercooler (heat exchanger)
110 Header tank 110a Tank internal space (internal space)
110b Bottom (core side bottom)
111 Core plate 111a Tube insertion hole (insertion hole)
111b Edge portion 111d Inclined surface 120 Core portion (heat exchange portion)
121 Heat dissipation fin (fin)
122 tube (flat tube)
122a End part 122b Joining part 200 Dispenser (coating device)
210 Paste brazing filler metal

Claims (8)

A core portion (120) having a plurality of stacked tubes (122) and fins (121) disposed between the plurality of tubes (122);
The core plate (111) joined to the plurality of tubes (122) constitutes a bottom surface (110b) on the core portion (120) side of the internal space (110a), and the internal space (110a) is the plurality of the internal spaces (110a). A header tank (110) communicating with the tube (122) of the heat exchanger,
The ends (122a) of the plurality of tubes (122) are inserted into the insertion holes (111a) of the core plate (111) to temporarily connect the core portion (120) and the core plate (111). A temporary fixing step for fixing;
After the temporary fixing step, a paste-like brazing material (210) is applied to a portion (122b) where the core plate (111) and the tube (122) are joined with a coating device (200) having a linear tip. An application process to
A joining step of heating the temporarily fixed body between the core portion (120) and the core plate (111) and brazing the core plate (111) and the tube (120) after the coating step; With
In the temporary fixing step, the core plate (111) in which the edge (111b) of the bottom surface (110b) in the direction orthogonal to the surface on which the core (120) is formed is retreated with respect to the center side of the core (120). A method of manufacturing a heat exchanger, characterized by temporarily fixing a heat exchanger. In the temporary fixing step, the core plate (111) in which an inclined surface (111d) inclined toward the insertion direction of the tube (122) is formed around the insertion hole (111a) is temporarily fixed.
2. The method of manufacturing a heat exchanger according to claim 1, wherein, in the application step, the paste brazing material (210) is applied between the inclined surface (111 d) and the tube (122). .   The method of manufacturing a heat exchanger according to claim 1 or 2, wherein the tube (122) is a tube having a flat cross section.   The at least one of claims 1 to 3, wherein, in the temporary fixing step, the core plate (111) and the tube (122) having at least a surface made of copper, copper alloy, or Ni are temporarily fixed. A method for producing the heat exchanger according to claim 1.   5. The method for manufacturing a heat exchanger according to claim 4, wherein in the application step, the paste brazing material (210) having a melting point of 550 to 700 ° C. is applied. In the joining step, the temporary fixing body is heated in a posture in which the core part (120) forming surface is substantially horizontal,
In the application step, the paste-like brazing material (210) is applied only to the upper side from the center in the position in the bonding step in the portion (122b) where the core plate (111) and the tube (122) are bonded. The method for manufacturing a heat exchanger according to any one of claims 1 to 5, wherein:   The coefficient of linear expansion of the core plate (111) is set smaller than the coefficient of linear expansion of the tube (122), The heat exchanger according to any one of claims 1 to 6, Production method. A core portion (120) having a plurality of stacked tubes (122) and fins (121) disposed between the plurality of tubes (122);
The core plate (111) joined to the plurality of tubes (122) constitutes a bottom surface (110b) on the core portion (120) side of the internal space (110a), and the internal space (110a) is the plurality of the internal spaces (110a). A header tank (110) communicating with the tube (122) of
The core plate (111) and the plurality of tubes (122) having end portions (122a) inserted in the insertion holes (111a) of the core plate (111) include a paste brazing material (210). A heat exchanger brazed by
In the core plate (111), an edge portion (111b) of the bottom surface (110b) in a direction perpendicular to the surface on which the core portion (120) is formed is retreated with respect to the center side of the core portion (120). Features heat exchanger.

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