JP2001138037A - Jig for manufacturing heat exchanger and method of manufacturing heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a jig for manufacturing a heat exchanger, with which in each process, a core is pressed with suitable pressure and the core can be held by raising the stickiness without developing gap between respective members and joinability with a brazing is improved, and a manufacturing method of the heat exchanger. SOLUTION: In the jig 10 used for manufacturing the heat exchanger which is provided with a tube element constituting tubes 2 made to flow of a medium in the inner part and the core 1 laminating fins 3 arranged between the tubes, the jig is provided with side plates 11A, 11B arranged at both side parts of the core and supported members 12A, 12B, 13A, 13B for supporting the side plates from both ends. The above jig arranges an elastic member 14 connected between the supporting members for supporting both side plates. Further, the heat exchanger is manufactured by using the above jig.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jig used for manufacturing a heat exchanger mounted on a vehicle or the like and a method for manufacturing the heat exchanger.

[0002]

2. Description of the Related Art Conventionally, a heat exchanger used in a heat exchange cycle mounted on a vehicle or the like is provided between a plurality of tubes that internally circulate a heat exchange medium circulating in the heat exchange cycle and the stacked tubes. It has a plurality of fins mounted thereon and a tank for distributing a heat exchange medium to each of the tubes. For example, an evaporator that cools air by evaporating and evaporating a heat exchange medium flowing through the inside, a pair of tube elements constituting a tank and a tube, and mounting a plurality of fins between the other pair of tube elements, and stacking a plurality of layers, It constitutes the core of the heat exchanger.

[0003] The tube element, fins, and the like constituting the core of the heat exchanger are formed using an aluminum material such as aluminum or an aluminum alloy in consideration of weight reduction and corrosion resistance when mounted on a vehicle. Aluminum materials include
An aluminum alloy brazing material to which Si or the like having a lower melting point than aluminum is added is coated, and this brazing material is melted to join the members.

[0004]

However, the surface of the aluminum material is covered with an oxide film. For this reason, the joining property by the brazing material is poor, and the brazing may not be performed well. The oxide film on the surface of the aluminum material constituting each member applies a chemical such as flux to aluminum,
The oxide film on the surface is removed. .

[0005] When a flux is applied to a brazed joint such as a tube element and a fin, and the tube element and the fin are laminated to constitute a core of a heat exchanger,
The lamination height of the core is increased by the amount of the applied flux.

When the core having a large lamination height is held by a jig and brazed in a furnace, the flux applied between the members and the brazing material coated on the surface of the members are melted, and the core is melted. Shrinks entirely in the stacking direction, and the stack height of the core is reduced. Therefore, in the core held by the jig, a gap is generated between the tube and the fin, a displacement and a gap of each member are generated, and the brazing material is not sufficiently supplied between the joints,
Problems such as deterioration of the joining property occur.

For this reason, it is conceivable to assume the stack height of the contracted core and hold the core in a jig having a size corresponding to the stack height. However, if the core before shrinking is held by a jig corresponding to the size after shrinking, the core has problems such as buckling of the fins and deformation of the tube due to the pressing of the jig.

For this reason, for example, a jig may be provided with a clamp or the like, and a core having a different lamination height before and after brazing may be pressed by a clamp or the like to secure the adhesion of the core.

For example, Japanese Utility Model Laid-Open No. 4-94159 discloses that
Core part 63 formed by laminating tube 61 and fin 62
A first pressing plate 64 for pressing one end of the core portion, a second pressing plate 65 for pressing the other end of the core portion, and the first and second pressing plates 64 and 65 move in a direction in which they are separated from each other. A brazing jig 60 for an aluminum heat exchanger, comprising a movement preventing member 66 for preventing the movement and a pressing spring 67 provided between the movement preventing member 66 and the first pressing plate 64 is disclosed. ing. The pressing spring 67 presses the first pressing plate 64 toward one end of the core portion 63.

For example, a jig which is provided with a clamp or a spring and tightens and holds a core which contracts after brazing by pressing thereof causes buckling of fins or the like having relatively low strength due to too high pressing force. In some cases. Further, when pressing a core that has shrunk before and after brazing, if the core is pressed unevenly in the stacking direction, buckling or deformation may occur at one end of the stacked core.

In addition, since an external force enough to hold the core is applied to an elastic body such as a spring and the core is held by a jig, the operation becomes complicated in some cases.

Accordingly, the present invention provides a method of pressing a core with an appropriate pressure before, during, and after brazing to secure the core without any gaps between the members and holding the core. It is an object of the present invention to provide a jig for manufacturing a heat exchanger and a method for manufacturing a heat exchanger, which can improve the joining property by brazing.

[0013]

According to the first aspect of the present invention, there is provided a jig for manufacturing a heat exchanger, comprising a tube element constituting a tube and a core formed by laminating fins provided between the tubes. Wherein the jig includes side plates provided on both sides of the core, and a support member that supports the side plates from both ends, and the jig includes an elastic member that connects the support members that support the both side plates. It is a jig for manufacturing the provided heat exchanger.

As described above, when the core is held by the jig, the jig causes the core, which changes the lamination height before, during and after brazing, to move from the side plate by the stress of the elastic member. The core is pressed substantially uniformly in the laminating direction to secure the adhesion of the core. Therefore, even when the brazing material or the flux is melted and the core shrinks in the laminating direction, the adhesiveness of the core is ensured by the jig, so that the bondability by brazing is improved. In addition, the jig has a two-part shape in which a side plate provided on both sides of the core and a support member that supports the side plate are connected by an elastic member.
It is possible to reduce the volume of the jig, reduce the difference between the heat capacity of the core and the heat capacity of the jig, and hold the core with an appropriate pressing force in each manufacturing process.

According to a second aspect of the present invention, in the first aspect of the invention, the elastic member includes a tension coil spring, a leaf spring or a spring for manufacturing a heat exchanger using a corrugated spring. Tool.

When a tension coil spring, a leaf spring, or a spring having a corrugated cross section is used as an elastic member for the jig for holding the core, the spring stress before, during and after brazing can be appropriately adjusted. To hold the core by applying strong pressure, without causing buckling of fins etc.
Improves brazeability by ensuring core adhesion.

According to a third aspect of the present invention, in the invention according to the first or second aspect, the support member has a locking portion for locking an elastic member. It is.

For example, when connecting the supporting members of the jig with the leaf spring, one end of the leaf spring is hooked on the locking portion of one of the supporting members, the core is set in the jig, and the other ends of the leaf spring are connected. By hooking the end to the engaging portion of the other support member, the core can be held on the jig in a one-touch manner, and the convenience of the operation is improved.

According to a fourth aspect of the present invention, there is provided a method of manufacturing a heat exchanger using a jig for holding a core formed by laminating a fin provided between tubes and a tube element constituting the tube. The core constituting the heat exchanger is a jig provided with side plates provided on both sides of the core, a support member supporting the side plates, and an elastic member connecting the support members supporting the both side plates. Hold and braze.

As described above, the core is held by the jig in which the supporting members for supporting the side plates provided on both sides of the core are connected by the elastic member, and the core is brazed. A pressure suitable for each step during brazing and after brazing is applied from a jig. Therefore, in the core, the adhesion between the members such as the tube element and the like is improved, and a sufficient brazing material is supplied between the joints of the members, so that the bonding by brazing is improved.

[0021]

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

FIG. 1 is a view showing a core 1 of an evaporator of a refrigeration cycle for in-vehicle air conditioning mounted on an automobile and a jig 10 holding the core 1.

As shown in FIG. 1, a core 1 constituting an evaporator is provided at one end of a tube element constituting a tube 2, a fin 3 mounted between a pair of tube elements, a laminated tube 2 and a fin 3. End plate 4 and a tank 5 in which a pair of tube elements is in contact with another pair of tube elements.
It is composed of

FIG. 3 shows a schematic configuration of the tube element 20.

As shown in FIG. 3, the tube element 20 constituting the tube 2 is formed using an aluminum material made of aluminum or an aluminum alloy. The aluminum material of this example is covered with a brazing material made of 5 to 15% of Al—Si. The tube element 20 made of the aluminum material has two cylindrical convex portions 21 at its ends, and a flat portion 21 a is formed at the end of the cylindrical convex portion 21. The adjacent tube elements 20 join the flat portions 21 a of the cylindrical convex portions 21 to form a tank 5 that distributes the medium to each tube 2. Further, the tube element 20 includes a concave portion 22 serving as a medium flow path, and a linear convex portion 23 substantially dividing the flow path into two.
And a contact portion 24 formed around the tube element 20 and a convex bead 25 formed in the flow path. The tube 2 includes the top of the linear projection 23 of the pair of tube elements 20, the contact portion 24, and the bead 25.
Are formed by brazing to each other.

The tube element 20 forms a core 1 by applying a flux to at least a portion to be joined to another member and then assembling the members. For example, a flux is applied to the top of the bead 25 of the tube element 20, the contact portion 24, the flat portion 21a, and the top of the linear projection 23. The reason why the flux is applied is to remove an oxide film existing at the brazing joint portion and supply a sufficient brazing material between the joining portions of the members.

Next, a process for manufacturing a heat exchanger such as an evaporator will be described.

First, in the first step, the tube elements 20 are press-formed using an aluminum material. Next, in the second step, cleaning is performed to remove impurities such as oil adhering to each tube element 20. I do.

In the third step, the tube element 2
A flux is applied to a brazing portion of a component constituting the core, such as the fin 3 or the end plate 4, and the fin 3 is mounted between the pair of tube elements 20, 20 and the other pair of tube elements 20, 20. The core 1 is configured. Then, as a fourth step, the core 1 is attached to the jig 10.
And the core 1 is brazed in a furnace at a predetermined temperature.

In the fifth step, the core 1 is unloaded from the furnace, removed from the jig 10, and a joint serving as a medium outflow / inlet is attached to the tank 5.

As a sixth step, the formed heat exchanger is subjected to a corrosion resistance treatment, in this case, a metal oxide film formation treatment, and then a hydrophilic film formation treatment such as a urethane resin film. After performing the security inspection of the heat exchanger, the evaporator is completed.

As described above, the jig 10 includes the tube element 20, the fin 3, and the end plate 4 before brazing.
The core before brazing, the core being brazed in the furnace, and the core discharged from the furnace are retained.

The core 1 shrinks in the laminating direction in the furnace because the brazing material and the flux existing between the joints of the respective members are melted. Therefore, the size of the core 1 in the laminating direction of the core 1 changes before, during and after brazing.

For example, compared to the core 1 before brazing,
The core 1 after brazing has a size in the laminating direction of 3 mm to 4 mm.
mm. Since the heat exchanger is a precision instrument having a small tolerance, it is necessary to ensure the close contact between the members in order to supply a brazing filler metal sufficient to join the members.

As shown in FIG. 1, the jig 10 includes side plates 11A and 11B provided on both sides of the core 1 and the side plate 1A.
Support member 12 for supporting 1A, 11B in the stacking direction of the core
A, 13A and 12B, 13B. Then, 12A and 13A supporting one side plate 11A and supporting members 12B and 13B supporting the other side plate are connected to each other by coil springs 14 and 14. In addition, FIG.
FIG. 2 is a plan view of the jig 10.

In the jig 10, substantially uniform pressure is applied to the core 1 from the side plates 11 A and 11 B with the contraction of the core 1 by the elastic stress of the tension coil spring 14, and the core 1 is pressed. Therefore, before brazing, at the time of brazing, and after brazing, the jig 10 appropriately presses the core 1 as the core 1 contracts, and the tube element 20, the fin 3, and the end plate constituting the core 1. 4 is always in close contact. Since the adhesiveness of the core 1 is ensured by the jig 10, the joining property by brazing is improved, and a good product can be provided.

The jig 10 has a two-part shape in which the supporting members 12A and 12B supporting the side plate 11A and the supporting members 13A and 13B supporting the side plate 11B are connected by a tension coil spring 14. , Jig 1
0 can be reduced, the difference between the heat capacity of the core 1 and the heat capacity of the jig 10 is reduced, and the core 1 is held at an appropriate pressing force in each manufacturing process.

Next, another specific example of the jig will be described.

FIG. 4 is a diagram showing a schematic configuration of the jig 30, and FIG. 5 is a plan view of the jig 30.

As shown in FIGS. 4 and 5, the jig 30
It has side plates 31A and 31B provided on both sides of the core 1, supporting members 32A and 33A for supporting the side plates 31A, and supporting members 32B and 33B for supporting the side plates 31B. The support member 32A and the support member 32B are connected by a leaf spring 34, and the support members 33A and 33B are similarly connected by a leaf spring 34.

Support members 32A, 32B, 33A, 33B
Is a locking portion 32 for locking a leaf spring 34 at its end.
a, 33a, 32b, 33b.

The end of the leaf spring 34 is supported by the support member 32.
B, 33B, the core 1 is set in the jig 30 and the other end of the leaf spring 34 is hooked on the locking portions 32a, 33a of the support members 32A, 33A. Hold. The leaf spring 34 is formed using, for example, a material such as Inconel or silicon nitride.

When the leaf spring 34 is used, the core 1 can be held on the jig 30 in a one-touch manner, and the convenience in operation is improved. When the leaf spring 34 is used, even if the core 1 has a large lamination height before brazing, the core 1 is held at an appropriate pressure without applying extra pressure to the core 1. Also,
At the time of brazing and after brazing, when the core 1 shrinks in the laminating direction due to the melting of the brazing material and the flux,
The core 1 is pressed from the side plates 31A and 31B substantially evenly by the elastic stress of the leaf spring 34.

Therefore, even before brazing, during brazing, and after brazing, the adhesion of the core 1 is ensured, and the brazing property of the core 1 is improved.

FIG. 6 shows a schematic configuration of the jig 40. The jig 40 of the present embodiment includes support members 42A and 43A for supporting the side plates 41A provided on the side of the core 1 and support members for supporting the side plates 41B. The members 42B and 43B are connected using leaf springs 44,44. In the leaf spring 44 of the present example, a concave portion 44a is provided substantially at the center of the leaf spring 44, and the elastic deformation of the leaf spring 44 in the stacking direction of the core 1 is reduced. For this reason, the jig 40
Can hold the core 1 to the jig 40 with a small force, and the convenience is improved in terms of work. The leaf spring 44 is
The elastic stress applied to the core 1 from the side plates 41A and 41B is adjusted, and the core 1 is held at an appropriate pressure without buckling of fins or the like. Therefore, core 1
In each process before brazing, during brazing and after brazing, the jig 40 is held at an appropriate pressure. Therefore, the tightness of the tube element 20, the fin 3, and the end plate 4 constituting the core 1 is ensured, and the joining property by brazing is improved.

FIGS. 7 and 8 show a schematic configuration of the jig 50. The jig 50 of the present embodiment includes a side plate 51 provided on the side of the core 1.
A and 51B and a supporting member 52A for supporting the side plate 51A
And a supporting member 52B supporting the side plate 51B are connected by a corrugated spring 54 having a corrugated cross section.
A support member 53A supporting A and a support member 52B supporting the side plate 51B are connected by a corrugated spring 54.

When the core 1 is held by the jig 50 using the corrugated spring 54, the corrugated spring 54 presses the core 1 with an appropriate pressure before, during and after brazing. Therefore, in each step, the tube element 20, the fin 3, and the end plate 4 which constitute the core 1 are held in close contact with each other by the jig 50. Therefore, the joining property by brazing is improved, and a good product can be manufactured.

[0048]

As described above, the present invention relates to a jig for manufacturing a heat exchanger comprising a tube element constituting a tube and a core formed by laminating fins provided between the tubes. The jig includes side plates provided on both sides of the core, and a support member that supports the side plates from both ends. The jig includes a heat member that includes an elastic member that connects the support members that support the both side plates. It is a jig for manufacturing an exchanger.

When the core is held by the jig, the core, which changes the lamination height before, during and after brazing, is substantially uniformly applied in the laminating direction from the side plate by the stress of the elastic member. Press to ensure core adhesion. Accordingly, in the furnace, the core in a state where the brazing material or the flux is melted and contracted is held by the jig, and the adhesion of the core is ensured, so that the joining property by brazing is improved. Further, the jig includes side plates provided on both sides of the core,
Since the support member supporting the side plate has a two-part shape connected by an elastic member, it is possible to reduce the volume of the jig, reduce the difference between the heat capacity of the core and the heat capacity of the jig, The core can be held with an appropriate pressing force in each manufacturing process.

Further, as the elastic member, a tension coil spring, a leaf spring or a spring having a corrugated cross section is used.

With these elastic members, the jig presses the core with an appropriate pressure, and before the brazing, at the time of brazing, and after the brazing, does not cause buckling of the fins and the like, thereby improving the adhesion of the core. Can be secured.

Further, the support member of the jig has a locking portion for locking the elastic member.

When a leaf spring is hooked on the locking portion and the core is set on the jig, the core can be held on the jig in a one-touch manner, thereby improving the workability.

When a heat exchanger is manufactured using the jig, the joining property by brazing is improved, and a good product can be provided.

[0055]

[Brief description of the drawings]

FIG. 1 is a diagram showing a state in which a core is held by a jig according to a specific example of the present invention.

FIG. 2 is a plan view of the jig shown in FIG.

FIG. 3 is a perspective view showing a tube element according to a specific example of the present invention.

FIG. 4 is a view showing a state where a core is held by a jig according to another specific example of the present invention.

FIG. 5 is a plan view of the jig shown in FIG.

FIG. 6 is a view showing a state in which a core is held by a jig according to another specific example of the present invention.

FIG. 7 is a view showing a state in which a core is held by a jig according to another specific example of the present invention.

8 is a plan view of the jig shown in FIG.

FIG. 9 is a view showing a schematic configuration of a jig for holding a core according to a conventional example.

[Explanation of symbols]

 Reference Signs List 1 core 2 tube 3 fin 4 end plate 5 tank 10 jig 11A side plate 11B side plate 12A support member 12B support member 13A support member 13B support member 14 tension coil spring 20 tube element 21 cylindrical protrusion 21a flat portion 22 recess 23 linear shape Convex part 24 Contact part 25 Bead 30 Jig 31A Side plate 31B Side plate 32A Support member 32a Lock part 32B Support member 32b Lock part 33A Support member 33a Lock part 33B Support member 33b Lock part 34 Plate spring 40 Jig 41A Side plate 41B Side plate 42A Support member 42a Lock portion 42B Support member 42b Lock portion 43A Support member 43a Lock portion 43B Support member 43b Lock portion 44 Plate spring 44a Recess 50 Jig 51A Side plate 51B Side plate 52A Support member 52B Support member Supporting member 53B Supporting member 54 Corrugated spring 60 Jig 61 Tube 62 Fin 63 Core part 64 First holding plate 65 Second holding plate 66 Move prevention member 67 Press spring

Claims (4)

[Claims] 1. A jig for manufacturing a heat exchanger, comprising: a tube element constituting a tube; and a core formed by laminating fins provided between the tubes, wherein the jig is provided on both sides of the core. Two side plates provided,
A jig for manufacturing a heat exchanger, comprising: a support member that supports the side plate; and the jig includes an elastic member that connects the support member that supports the two side plates. 2. The elastic member includes a tension coil spring,
The jig for manufacturing a heat exchanger according to claim 1, wherein a leaf spring or a spring having a corrugated cross section is used. 3. The jig for manufacturing a heat exchanger according to claim 1, wherein the support member includes a locking portion for locking an elastic member. 4. A method of manufacturing a heat exchanger using a jig for holding a core formed by laminating fins provided between tubes and a tube element constituting a tube through which a medium flows, wherein a heat exchange is performed. The core constituting the vessel is held by a jig provided with side plates provided on both sides of the core, a support member supporting the side plates, and an elastic member connecting the support members supporting the both side plates. A method for manufacturing a heat exchanger, comprising performing brazing.