JP2008119745A - Tool for brazing heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tool for brazing a heat exchanger by which joining parts do not interfere with tubes and fins and a temporarily assembled state is held good when a core part is thermally expanded in the building-up direction of the tubes in a furnace. <P>SOLUTION: The tool 12 for brazing the heat exchanger is used for clamping both sides in the building-up direction of the tubes 7 of the core part when the core part 4 is integrally brazed and fixed after temporarily assembling the core part 4 which is composed of a plurality of built-up tubes 7 which are interposed respectively between a plurality of fins 8 and tube plates 5(6) which are connected to end parts in the longitudinal direction of each tube and comprise at least parts of tanks 2(3), and the tool is provided with restraining parts 13, 14 which are brought into contact with both sides in the building-up direction of the tube in the core part 4, connecting parts 15, 16 one end parts of which are joined to the respective corresponding restraining parts 13, 14 and the other end parts of which are extended in the longitudinal direction of the tubes 7 and joining parts 17 with which the other end parts of both the connecting parts 15, 16 are joined each other and the joining parts 17 are elastically deformed in a direction in which the joining parts do not interfere with the tubes 7 and the fins 8 of the core part 4 when performing brazing and fixing. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a brazing jig for a heat exchanger.

Conventionally, after temporarily assembling a core part composed of a plurality of tubes interposed between each of a plurality of fins and a tube plate connected to the longitudinal end of each tube and forming at least a part of a tank, When this core part is integrally brazed and fixed, a technique of a brazing jig for a heat exchanger used to sandwich both sides of the core part in the stacking direction is known (Patent Document). 1 and 2).
JP 2004-174588 A Japanese Patent Laid-Open No. 08-19858

However, in the conventional invention, as shown in FIG. 15, the restraining portions 013 and 014 that are the contact portions of the core portion of the brazing jig with both sides of the tube stacking direction are on the center line of the coupling portion 017. Therefore, as shown in FIG. 16, the moment F01 generated when the core part 04 is thermally expanded in the stacking direction of the tube 07 in the furnace changes to a moment F02 that twists the vicinity of the restraint parts 013 and 014 in the vertical plane. The moment F03 lifts near the center of the coupling portion 017. As a result, the tube 07 and the fin 08 of the core portion 04 may interfere with the bent coupling portion 017 (illustrated by a broken line) to crack and break. .
In addition, cracks and breakage of the tube are difficult to identify until a water flow test is performed after the tank is installed, so if a defective product occurs in the manufacturing stage of the core part, peripheral members including the tank will be discarded together. This leads to a decrease in production efficiency.

  The present invention has been made to solve the above-mentioned problems, and the object of the present invention is to cause the coupling portion to interfere with the tube and the fin when the core portion is thermally expanded in the stacking direction of the tube in the furnace. It is an object of the present invention to provide a brazing jig for brazing of a heat exchanger that can satisfactorily maintain the temporarily assembled state of the core portion.

  According to the first aspect of the present invention, a plurality of tubes interposed between the plurality of fins and a tube plate connected to the longitudinal end of each tube and forming at least a part of the tank. After temporarily assembling the core part, when brazing and fixing the core part integrally, in the brazing jig of the heat exchanger used to sandwich both sides of the tube of the core part in the stacking direction, A constraining portion that contacts both sides of the tube of the core portion in the stacking direction, one end portion coupled to the corresponding constraining portion, and the other end portion extending in the longitudinal direction of the tube; A connecting portion that connects the other end portions is provided, and when the brazing is fixed, the connecting portion is elastically deformed in a direction that does not interfere with the tube and the fin of the core portion.

  According to the first aspect of the present invention, a plurality of tubes interposed between the plurality of fins and a tube connected to the longitudinal end of each tube and forming at least a part of the tank After temporarily assembling the core part composed of a plate, when brazing and fixing the core part integrally, the brazing treatment of the heat exchanger used for clamping both sides of the tube in the stacking direction of the core part A restraining portion that contacts both sides of the tube of the core portion in the stacking direction, one end portion coupled to the corresponding restraining portion, and the other end portion extending in the longitudinal direction of the tube; A connecting portion for connecting the other end portions of the connecting portion is provided, and the core portion is laminated in the furnace in order to elastically deform the connecting portion in a direction not to interfere with the tube and the fin of the core portion when fixing by brazing. Thermal expansion in the direction When the, elastically deformed without the coupling unit from interfering with the tubes and the fins, can be satisfactorily hold the provisionally assembled state of the core part.

  Embodiments of the present invention will be described below with reference to the drawings.

Example 1 will be described below.
1 is a front view of a heat exchanger according to a first embodiment of the present invention, FIG. 2 is a front view of a core portion according to the first embodiment, FIG. 3 is a perspective view (only a part), and FIG. It is sectional drawing in -S4 line.

  5 is a perspective view of the brazing jig of the first embodiment, FIG. 6 is a plan view of the same, FIG. 7 is a front view of the brazing jig, and FIG. 8 is a fixing of the heat exchanger and the brazing jig of the first embodiment. FIG. 9 is a sectional view taken along line S9-S9 in FIG. 8, and FIG. 10 is a diagram for explaining the operation of the first embodiment.

First, the overall configuration will be described.
As shown in FIG. 1, the heat exchanger 1 of the first embodiment includes resin tanks 2 and 3 and an aluminum core portion 4.

  Each tank 2 and 3 is formed in a substantially vessel shape, and the tank 2 is provided with an input port 2a that communicates with the inside thereof and protrudes in a cylindrical shape to the rear, while the tank 3 communicates with the inside thereof. And the output port 3a which protrudes cylindrically back is provided.

  As shown in FIG. 2, the core portion 4 is adjacent to a pair of tube plates 5 and 6 to which the corresponding tanks 2 and 3 are mounted, and a plurality of tubes 7 stacked between the tube plates 5 and 6. The corrugated fins 8 are arranged between the matching tubes 7 and a pair of reinforcements 9 and 10 for connecting and reinforcing both ends of the tube plates 5 and 6.

  As shown in FIGS. 3 and 4, the tube plates 5 and 6 are formed in a substantially dish shape, and the corresponding tanks 2 and 3 are respectively provided by a plurality of claw portions 5a and 6a (see FIG. 2) protruding from the outer peripheral edge thereof. Is fixed by caulking through a seal member S1.

  The tube 7 is formed in a flat tube shape, and its end portion 7a is brazed and fixed in a state of being inserted and fixed to the corresponding tube plates 5 and 6, respectively.

The fins 8 are formed in a wave shape, and are brazed and fixed together in a state where the tops of the waves are in contact with the adjacent tubes 7.
Further, the top portions of the fins 8 positioned at the outermost end of the core portion 4 are brazed and fixed together in contact with the corresponding corresponding reinforcements 9 and 10.
Furthermore, a plurality of louvers 8a (see FIG. 9) are provided between the tops and valleys of the fins 8.

  The reinforcements 9 and 10 are formed in a plate shape having a substantially U-shaped cross section, and their end portions 11 are brazed and fixed together while being inserted and fixed to the corresponding tube plates 5 and 6, respectively.

  In addition, a clad layer (brazing sheet) is provided on at least one of the joint portions of the constituent members in the core portion 4 of the first embodiment, and the joint portions are joined by brazing as will be described later.

When manufacturing the heat exchanger 1 configured as described above, first, the respective constituent members of the core portion 4 are temporarily assembled, and then a brazing jig 12 described later is mounted on the core portion 4. By performing heat treatment in a heating furnace (not shown), the joint portions of the constituent members of the core portion 4 are brazed and fixed to be integrally formed.
Specifically, as shown in FIGS. 5 to 7, the brazing jig 12 according to the first embodiment includes substantially cylindrical restraint portions 13 and 14 arranged at a predetermined interval, and one end portion. The plate-like connecting portions 15 and 16 are connected to the corresponding restraining portions 13 and 14 and the other ends are extended in the longitudinal direction of the tube 7, and the other ends of both the connecting portions 15 and 16 are linearly formed. The plate 7 is composed of a plate-shaped coupling portion 17 having a thin rectangular cross section in the longitudinal direction, and is made of stainless steel.

  Further, the coupling portion 17 is formed with a notch portion 18 which is notched with a predetermined length L and a predetermined depth H, and horizontal seat portions 19a and 19b are formed on both sides of the notch portion 18. ing.

Next, the operation will be described.
As shown in FIGS. 8 and 9, the brazing jig 12 configured as described above is configured to hold both the restraining portions 13 and 14 in contact with the side surfaces of the corresponding reinforcements 9 and 10 of the core portion 4. In addition, both seats 19a and 19b are conveyed to the heating furnace while being in contact with the bottom surfaces of the corresponding reinforcements 9 and 10, respectively. In the second embodiment, two brazing jigs 12 are attached to the core portion 4, but this is not restrictive.

  At this time, a gap H is formed by the notch portion 18 between the coupling portion 17 of the brazing jig 12 and the tube and fin of the core portion 4, whereby the core portion 4 of the brazing jig 12 is formed. It is possible to prevent contact with the tubes and fins during mounting and transporting.

  Further, since the restraining portions 13 and 14 are formed in a substantially cylindrical shape, the core portion 4 when the brazing jig 12 is attached to the core portion 4 is compared with the case where the restraining portions 13 and 14 are formed in a rectangular shape. A slight error in assembly accuracy can be allowed.

  The number and position of the brazing jigs 12 can be set as appropriate depending on the size of the core portion 4 and the like.

  In the furnace, the brazing jig 12 is made of stainless steel having a lower coefficient of thermal expansion than the aluminum core 4, and therefore the stacking direction of the tubes 7 of the core 4 at both the restraining portions 13 and 14. The temporary assembly state is maintained by sandwiching both sides.

  At this time, as shown in FIG. 10 (a), the moment F1 generated when the core portion 4 is thermally expanded in the stacking direction of the tube 7 changes to a moment F2 that twists the connecting portions 15 and 16, As shown in FIG. 10B, the moment F3 is bent so that the vicinity of the center of the coupling portion 17 is closer to the both restraining portions 13 and 14 side.

  That is, as shown in FIG. 6, the brazing jig 12 has a straight line X <b> 1 that connects the restraining portions 13 and 14 that are in contact with both sides of the core portion 4 in the stacking direction of the tube. Therefore, most of the moment F1 described above changes to the moment F2 and the moment F3, and these are mainly dispersed and absorbed by the bending of the coupling portion 17.

  Accordingly, there is no moment that the center portion of the joint portion 17 is bent toward the core portion 4 side, so that there is no possibility that the tube 7 and the fin 8 interfere with the joint portion 17 to be damaged or cracked, and the product reliability. Can be improved.

  In the first embodiment, a predetermined gap H is formed between the tube 7 and the fin 8 by the notch 18 of the joint 17 of the brazing jig 12, so that the joint 17 is self-weighted in the furnace. Therefore, there is no possibility of interfering with the tube 7 and the fin 8 even when the core portion 4 is thermally deformed.

  Furthermore, the tubes 7 and the fins 8 of the core portion 4 can be evenly restrained inward by the brazing jig 12 through the reinforcements 9 and 10, which is preferable.

  After the brazing jig 12 is removed, the heat exchanger 1 configured as described above is mounted on the vehicle in a state where the tanks 2 and 3 corresponding to the tube plates 5 and 6 are mounted, respectively.

  The high-temperature flow medium flowing into the tank 2 from the input port 2a was cooled by exchanging heat with the vehicle traveling wind or the forced wind of a fan (not shown) while flowing into the tank 3 via each tube 7. After that, it is discharged from the output port 3a and functions as a radiator.

Next, the effect will be described.
As described above, in the brazing jig 12 for brazing of the heat exchanger of the first embodiment, a plurality of tubes 7 interposed between the plurality of fins 8 and stacked, After temporarily assembling the core portion 4 which is connected to the longitudinal end portion of the tube 7 and is composed of the tube plate 5 (6) forming at least a part of the tank 2 (3), the core portion 4 is brazed integrally. When fixing, in the brazing jig 12 for brazing of the heat exchanger used for clamping both sides of the tube 7 in the core part 4 in the laminating direction, both sides of the core part 4 in the laminating direction of the tube 7 are applied. The constraining restraints 13 and 14 are connected to the corresponding restraining portions 13 and 14, respectively, and the other ends are extended in the longitudinal direction of the tube 7, and the connecting portions 15 and 16 are connected to each other. It is provided with a connecting part 17 for connecting the other end parts of the In order to elastically deform the portion 17 in a direction not interfering with the tube 7 and the fin 8 of the core portion 4, when the core portion 4 is thermally expanded in the stacking direction of the tube 7 in the furnace, the coupling portion 17 is connected to the tube 7 and the fin 8. Therefore, the temporary assembly state of the core portion 4 can be satisfactorily maintained.

  Moreover, since the cross-sectional shape of the coupling portion 17 is a rectangle in which the longitudinal direction of the tube 7 is thin, smooth elastic deformation at the time of brazing can be realized, which is preferable.

  Further, since the gap H is formed between the coupling portion 17 and the tube 7 and the fin 8 of the core portion 4, the coupling portion 17 interferes with the tubes 7 and the fins 8 when the core portion 4 is mounted or brazed. Can be surely prevented.

  In addition, both ends of the tube 7 of the core portion 4 in the stacking direction are connected and reinforced by reinforcements 9 and 10 respectively connected to the corresponding tube plates 5 and 6, respectively. Since the notches 18 for forming the gap H between the tube 7 and the fins 8 of the core 4 and the seats 19a and 19b that contact the reinforcements 9 and 10 are provided, the seats 19a and 19b are made rain. The clearance H can be reliably secured by a simple operation of contacting the forces 9 and 10, and the brazing jig 12 can be easily disposed at a predetermined position.

  In addition, the brazing jig 12 can restrain the tubes 7 and the fins 8 of the core portion 4 inwardly through the reinforcements 9 and 10 and is thus preferable.

  Further, since the restraining portions 13 and 14 are formed in a substantially cylindrical shape, the core portion 4 when the brazing jig 12 is attached to the core portion 4 is compared with the case where the restraining portions 13 and 14 are formed in a rectangular shape. A slight error in assembly accuracy can be allowed.

Example 2 will be described below.
In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, the description thereof will be omitted, and only differences will be described in detail.
FIG. 11 is a diagram illustrating a brazing jig according to a second embodiment of the present invention.

  As shown in FIG. 11, the second embodiment is different from the first embodiment in that the coupling portion 20 is formed in a curved shape so as to approach both the restraining portions 13 and 14.

  Therefore, in addition to the effects of the first embodiment, the moment F3 applied to the coupling portion 17 of the core portion 4 can be smoothly dispersed and absorbed in the furnace, which is preferable.

Example 3 will be described below.
In the third embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, the description thereof will be omitted, and only differences will be described in detail.

  12 is a perspective view of a brazing jig according to a third embodiment of the present invention, FIG. 13 is a cross-sectional view taken along line S13-S13 in FIG. 12, and FIG. 14 is a diagram for explaining the operation of the third embodiment.

  As shown in FIGS. 12 and 13, in the third embodiment, instead of the coupling portion 17 described in the first embodiment, the coupling portion is inclined so that the tip on the core side approaches the both restraining portions 13 and 14 side. 30 is different from the first embodiment. The inclination angle α can be set as appropriate.

  Further, rotation restraining members 31 project from the inner sides of the restraining portions 13 and 14, respectively.

  Therefore, when the brazing jig 12 of the third embodiment is used, as shown in FIG. 13, the restraining portions 13 and 14 due to thermal expansion of the heat exchanger 1 are pressed outward as in the first embodiment. By the strong force F1, the twisting force G1 around the X axis and the rotating force G2 around the Y axis act on the root of the coupling portion 30 and each of the coupling portions 15, 16, but the coupling portion 30 is inclined. By being formed, as shown in FIG. 14, the coupling portion 30 can be bent away from the core portion 4 of the heat exchanger 1 (shown by the arrow in FIG. 12). Contact between the coupling part 30 of the jig 12 and the core part 4 can be avoided.

  Further, it is possible to prevent the brazing jig 12 from falling over by causing the rotation restraining members 31 to contact the corresponding reinforcements 9 and 10 respectively.

  Further, even in the structure in which the coupling part 30 is provided only on one side of the core part 4, the restraining parts 13 and 14 can be kept substantially parallel, so that the core part 4 after brazing is not distorted.

Although the present embodiment has been described above, the present invention is not limited to the above-described embodiment, and design changes and the like within a scope not departing from the gist of the present invention are included in the present invention.
For example, the material of the brazing jig 12 and the detailed shape and thickness of the part can be set as appropriate. Further, the reinforcements 9 and 10 can be omitted.

It is a front view of the heat exchanger of Example 1 of this invention. It is a front view of the core part of the present Example 1. FIG. It is a perspective view (only a part) of the core part of the present Example 1. FIG. It is sectional drawing in the S4-S4 line | wire of FIG. It is a perspective view of the jig for brazing of the first embodiment. It is a top view of the jig | tool for brazing of the present Example 1. FIG. It is a front view of the jig for brazing of the present Example 1. It is a front view explaining fixation of the heat exchanger of this Example 1, and the jig | tool for brazing. It is sectional drawing in the S9-S9 line | wire of FIG. It is a figure explaining the effect | action of the present Example 1. FIG. It is a figure explaining the jig for brazing of Example 2 of the present invention. It is a perspective view of the jig for brazing of Example 3 of the present invention. 13 is a cross-sectional view taken along line S13-S13 in FIG. It is a figure explaining the effect | action of the present Example 2. FIG. It is a perspective view explaining the jig for brazing in the past. It is a figure explaining the effect | action of the jig | tool for brazing in the furnace in the past.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat exchanger 2, 3 Tank 2a Input port 3a Output port 4 Core part 5, 6 Tube plate 5a, 6a Claw part 7 Tube 7a End part 8 Fin 8a Louver 9, 10 Reinforce 11 End part 12 Brazing jig 13, 14 Restraining part 15, 16 Connecting part 17, 20, 30 Coupling part 18 Notch part 19a, 19b Seat part 31 Rotation inhibiting member

Claims (6)

After temporarily assembling a core part composed of a plurality of tubes interposed between each of the plurality of fins and a tube plate connected to the longitudinal end of each tube and forming at least a part of the tank, this core In the brazing jig of the heat exchanger used to clamp both sides of the core part in the stacking direction when the parts are brazed and fixed integrally,
A restraining portion that contacts both sides of the tube of the core portion in the stacking direction;
One end portion is coupled to the corresponding restraint portion, and the other end portion is extended in the longitudinal direction of the tube,
A coupling portion for coupling the other end portions of the two coupling portions;
A brazing jig for a heat exchanger, wherein the joining portion is elastically deformed in a direction not interfering with the tube and fin of the core portion when the brazing is fixed. In the heat exchanger brazing jig according to claim 1,
A brazing jig for a heat exchanger, characterized in that the cross-sectional shape of the coupling portion is a rectangle in which the longitudinal direction of the tube is thin. In the heat exchanger brazing jig according to claim 1 or 2,
Reinforcing and reinforcing both sides of the tube of the core part in the stacking direction with reinforcements connected to the corresponding tube plates at both ends,
A heat exchanger characterized in that the coupling portion is provided with a notch portion for forming a gap between the coupling portion and the tube and fin of the core portion, and a seat portion that contacts each of the reinforcements. Brazing jig. In the brazing jig of the heat exchanger according to any one of claims 1 to 3,
A brazing jig for a heat exchanger, wherein the restraining portion is formed in a substantially cylindrical shape. In the brazing jig of the heat exchanger according to any one of claims 1 to 4,
A brazing jig for a heat exchanger, wherein the coupling portion is curved so as to approach the both restraining portions. In the brazing jig of the heat exchanger according to any one of claims 1 to 5,
A brazing jig for a heat exchanger, characterized in that the coupling portion is inclined so that the tip on the core portion side approaches both restraint portions.

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