JP5661578B2 - Manufacturing method of heat exchanger - Google Patents

Description

  The present invention relates to a heat exchanger used in a vehicle air conditioner and a method for manufacturing the same. More specifically, the present invention relates to a heat exchanger provided with a support frame member that reinforces a core portion.

As a heat exchanger connected to a refrigerant circuit of a vehicle air conditioner, for example, a condenser or an evaporator is known. Since such a heat exchanger is mounted on a vehicle that is a moving body, even if it receives a strong external force such as when the vehicle suddenly starts or stops, it does not cause damage or the like. It is necessary to form the structure. For this purpose, a structure in which a long reinforcing support frame member (also referred to as a side plate or the like) is conventionally provided on the peripheral edge portion of the core portion serving as the main body portion of the heat exchanger is employed.
As the above support frame member, for example, there are many types of channel type which are processed into a side wall by bending up the left and right sides of a flat and long member before processing, and have a substantially U-shaped cross section. Adopted (Patent Document 1, Patent Document 2).

JP-A-5-248783 JP 2003-94135 A

Further, in the conventional support frame member, the end portion in the longitudinal direction (the portion having a predetermined length from the end edge) is a tongue-like flat plate end portion without a side wall, and is disposed near the side portion of the core portion. The structure of inserting into the receiving hole of the tank to be fixed, and fixing is employ | adopted (refer FIG. 1, FIG. 2 of patent document 1, FIG. 2 of patent document 2).
However, in consideration of the heat exchanger actually mounted on the vehicle, an extremely strong external force may act on the flat plate end as the vehicle moves. Therefore, for example, in a simple shape in which rectangular side walls are erected at right angles on both the left and right sides of the rectangular bottom plate portion shown in FIG. There is a concern that stress concentrates on the root part) and breaks.

On the other hand, since the support frame member disclosed in Patent Document 2 is a triangular side wall inclined between the side wall and the flat plate end, the stress concentration pointed out above is somewhat relaxed. I think that the. However, even in such a shape, the flat plate end portion is narrower than the portion provided with the side wall, and stress is applied to the boundary between the side wall and the flat plate end portion (the root portion of the flat plate end portion). There is a concern about the concentration and breaking.
The object of the present invention has been made in view of the above-described conventional problems, and proposes a reliable heat exchanger having a support frame member having excellent durability without worrying about stress concentration, and the like. It is to provide an efficient manufacturing method.

The above object is a method of manufacturing a heat exchanger including a reinforcing support frame member that is long and has a substantially U-shaped cross-sectional shape, which is disposed at the periphery of a plate-like, generally rectangular core. A first area formed in a first width in a plan view before processing; a second area formed in a second width that is wider than the first width and widened from the central axis; and A step of preparing a long member formed in a shape including a third area having an isosceles trapezoidal shape by gradually changing the width based on a width difference between the first area and the second area; The long receiving jig in which the groove portions of the width and the depth are provided in a straight line, and the first area of the long member placed on the receiving jig, the transverse shape of which is generally rectangular and long A head portion formed to a width that fits the groove portion, and the head portion. And a pressing step of forming a support frame member using a pressing jig formed by a body trunk portion that is formed narrow as well as left and right, and in the pressing step, the above-described placing on the receiving jig When the long member is pushed by the pushing jig without being deformed by the head portion, the second area of the long member and the main body trunk portion are pushed. The third area is bent so that the cross-sectional shape is substantially U-shaped with the outer shape following the groove, and a support frame member having a constant outer width is formed . Between the head part and the body body part, a taper part having a width gradually changed based on a width difference is provided, and in the longitudinal direction, the third area is formed longer than the taper part. In the pressing step, before the third area The distal end portion of the first area side so as to correspond to the taper portion and forming the support frame member, can be achieved by the present invention.

According to the present invention, between the can and the heat exchanger outer width with a support frame member having excellent durability at a constant efficiently easily manufactured, particularly the head portion and the rear barrel, a width based on the width difference By using the pushing jig provided with the taper portion in which the length is gradually changed, the third area of the long member is torsionally deformed, and the side walls extending from the flat plate end portion to the left and right side walls can be reliably formed.

It is the perspective view which showed the external appearance of the capacitor | condenser as a heat exchanger which concerns on one Embodiment of this invention. It is the figure which expanded the left end part of the support frame member employ | adopted as a heat exchanger, (a) is a top view, (b) is a side view. (A) is a plan view showing a state in which a long member is placed on a receiving jig, (b) is a plan view of a pushing jig, and (c) is a long member placed on the receiving jig, It is a top view which shows the state which mounted the pushing jig | tool on it. It is the figure which showed typically a series of processes which press a long member used as a material and obtain a support frame member using a receiving jig and a pushing jig.

Hereinafter, a heat exchanger according to an embodiment of the present invention will be described with reference to the drawings. Here, the case where the heat exchanger is a condenser of a vehicle air conditioner will be described as an example.
FIG. 1 is a perspective view showing the appearance of a capacitor 1 as a heat exchanger. For example, the capacitor 1 is incorporated in a refrigerant circuit that forms a refrigeration cycle of a vehicle air conditioner (not shown), and functions as a radiator that cools the refrigerant when the air conditioner is in operation.
The present invention is a heat exchanger characterized in that a support frame member that reinforces a core portion has a novel structure. And the basic composition with which a heat exchanger should be provided may be common in the past. Therefore, hereinafter, the configuration of the capacitor 1 will be briefly described, and the structure of the new support frame member employed in the capacitor 1 will be described in detail. In many cases, such a support frame member is fixed with a bracket or the like as an attachment member to the vehicle, and functions as a reinforcing structure of the core portion and an attachment structure to the vehicle.

As shown in FIG. 1, the capacitor 1 has a core portion 100 that is formed by alternately laminating tubes 110 that circulate a refrigerant (that is, a medium) and corrugated fins 120 at the center. Since such a core part 100 is provided with a plurality of tubes 110, heat exchange is performed using air flowing between the refrigerant and the tubes. The end of each tube 110 is connected to a first tank 131, a second tank 132, and a third tank 133. The first tank 131 has a refrigerant inlet 134 and a third tank 133. Is provided with a refrigerant outlet 135. Each of the tanks 131 to 133 is a hollow tubular body whose upper and lower ends are closed. Reference numeral 137 denotes a subcool tank.
As is apparent from the drawing, the core portion 100 has a rectangular shape with a rough outer shape, and support frame members 10 serving as reinforcing members are disposed at upper and lower ends (peripheries). The support frame member 10 is supported by the tanks 131 to 133 at both ends of the support frame member 10.

  In this capacitor 1, support frame members 10 arranged at the upper and lower ends of the core portion 100 are formed in a novel shape. Hereinafter, the support frame member 10 will be described. The capacitor 1 shown in FIG. 1 is provided with a support frame member 10 at each of the upper and lower ends (periphery), and a mounting bracket 140 serving as an attachment member to the vehicle side, for example, is fixed to the support frame member 10. It is used for assembly to the vehicle side. Since the structure of the support frame member 10 is the same for both the upper and lower sides, the upper support frame member 10 will be described here.

  As shown in FIG. 1, the support frame member 10 is a long member having a substantially U-shaped cross section, and is installed in a posture in which the upper side is released. More specifically, the support frame member 10 is a channel-type member arranged in an upward posture, and the back surface (lower surface) is fixed to the upper end (part of the peripheral edge) side of the core portion 100 to support the frame structure. Is functioning as

FIG. 2 is an enlarged view of the left end side of the support frame member 10, FIG. 2 (a) is a plan view, and FIG. 2 (b) is a side view. The right end portion side of the support frame member 10 has a similar structure.
FIG. 2 shows a part of the left end side of the support frame member 10, but the whole is long and the cross-sectional shape is a U-shaped channel type. The tip portion is a tongue-like flat plate end portion 11 for insertion into a receiving hole provided in a tank (see FIGS. 1, 131 to 133) disposed in the vicinity of the core portion. The right side (center side) of the support frame member 10 has left and right side walls 14a and 14b through an intermediate part 12 formed with a triangular side wall 15 in which the side wall height gradually changes. It becomes part 13.

  The flat plate end portion 11 is provided in a range of a predetermined length Lt from the end edge 11e in the longitudinal direction LD, and its planar shape is roughly rectangular (rectangular) for insertion into the receiving hole provided in the tank as described above. However, if necessary, for example, the width on the distal end side may be slightly narrower than the width on the proximal end side.

  Moreover, the side wall installation part 13 has the width direction WD perpendicular | vertical to the center axis line CL, and the part widened by the same width from each right-and-left side end position of the said flat plate edge part 11 is made into the left and right side wall. That is, the width of the flat plate end portion 11 in the width direction WD is Lw, and in the region corresponding to the side wall installation portion 13, the widened portion widened with the width Wt from the width Lw of the flat plate end portion 11 along the central axis CL. The left and right side walls 14a and 14b are formed by extending and widening the bent portions. FIG. 2 shows the widened portion after the left and right side walls 14a and 14b, so that the height of the side wall corresponds to the widened width Wt.

  The support frame member 10 has a structure in which an intermediate portion 12 is provided between the flat plate end portion 11 and the side wall installation portion 13. The intermediate portion 12 is formed in an isosceles trapezoidal shape in plan view by gradually changing the width based on the width difference between the flat plate end portion 11 and the side wall installation portion 13 before bending the left and right widened portions. It has a shape. Therefore, a triangular side wall 15 connected to the left and right side walls 14a, 14b from the flat plate end portion 11 is deformed and bent partly (specifically, a part where the width gradually changes) after bending. Is formed.

And as a characteristic structure, the said flat plate end part 11, the side wall installation part 13, and the intermediate | middle part 12 are formed uniformly in the external width (length in the width direction WD). Although this point is clear from FIG. 2A, in this support frame member 10, the width dimension Lw in the width direction WD is constant.
In addition, in order to clarify the shape characteristic of the support frame member 10 in the above-mentioned description, although it divided into each part and the flat plate edge part 11, the side wall installation part 13, and the intermediate part 12, it was actually explained. The support frame member 10 is an integral member manufactured by pressing one long member (a long member 20 described later) using a predetermined jig (a pair of molds). A method for manufacturing the support frame member 10 will be described in detail later.

  The shape of the support frame member 10 having the above shape gradually changes between the tongue-shaped flat plate end portion 11 inserted into the tank and the side wall installation portion 13 having the left and right side walls 14a and 14b. Since the intermediate portion 12 is provided and the outer width (length in the width direction WD) is made constant between the flat plate end portion 11 and the side wall installation portion 13 as a whole, there is no fear of destruction due to stress concentration. It has a shape with improved durability and has a stronger structure against external forces. Therefore, the heat exchanger provided with such a support frame member also becomes a highly reliable device with excellent durability.

Below, the manufacturing method suitable for manufacturing the support frame member 10 of the structure shown in FIG. 2 is further demonstrated with reference to FIG. 3 and FIG.
In addition, the manufacturing method of the support frame member demonstrated below prepares the elongate member 20 comprised in the shape which set the 3rd area between the 1st area and the 2nd area, and receives a receiving jig (receiving metal mold | die). The support frame member 10 is obtained by placing the material on the surface 30 and performing a pressing process in which it is pressed from above with a pressing jig (pressing die) 40.

  FIG. 3 shows the long member 20, the receiving jig 30, and the pushing jig 40, and FIG. 3A is a plan view showing a state in which the long member 20 is placed at a predetermined position on the receiving jig 30. 3 (b) is a plan view of the pushing jig 40, and FIG. 3 (c) is a case where the long member 20 is placed at a predetermined position on the receiving jig 30, and further pushed into the predetermined position on the long member 20. It is the top view which showed the state which mounted the jig | tool 40. FIG.

FIG. 4 is a diagram schematically showing a series of steps for obtaining a support frame member by pressing the long member 20 as a material using the receiving jig 30 and the pushing jig 40. That is, like FIG. 3, FIG. 4 also shows the long member 20, the receiving jig 30, and the pushing jig 40. FIG. 4 is continuous so that the process of obtaining the support frame member from the long member 20 can be confirmed. It is a diagram shown.
FIG. 4A shows a state in which the pushing jig 40 is disposed above the long member 20 at a predetermined position on the receiving jig 30, and FIG. The state immediately before the start is shown. In addition, in FIG.4 (b), the front view seen from the jig | tool edge part to the longitudinal direction is shown in the lower stage. The state shown in FIG. 4B corresponds to the state shown in the plan view of FIG.
FIG. 4C shows a state in which the pressing jig 40 is pressed down to deform the long member 20 into a shape along the jig. FIG. 4D shows the pressing jig 40 after pressing. The state which the target support frame member 10 was completed in the groove part 31 of the receiving jig 30 is shown. FIG. 4D also shows a front view as viewed from the end of the jig in the longitudinal direction at the lower stage.

  Now, referring to FIG. 3, the long member 20 is a first area 21 formed to have a first width, a second area which is wider than the first width and is widened from the central axis to the same width. A shape including a second area 22 formed in a width, and a third area 23 having an isosceles trapezoidal shape by gradually changing the width based on the width difference between the first area 21 and the second area 22. It is formed.

On the other hand, the receiving jig 30 is a long shape on which the long member 20 is placed, and the outer shape of the cross section is a square shape, and the central portion thereof is linear with a certain width and depth along the longitudinal direction. The groove part 31 is provided in this.
Further, the pushing jig 40 has a rectangular cross-sectional shape and is long, and is a portion that pushes the first area 21 of the long member 20 placed on the receiving jig 30 and just fits into the groove 31. A head portion 41 formed in a width, and a main body barrel portion 42 formed narrower in the same manner as the left and right sides of the head portion 41, and as a preferable structure, between the head portion 41 and the main body barrel portion 42. Is provided with a tapered portion 43 in which the width difference is gradually changed. As shown in FIG. 3C, when the plate thickness (dimension) of the long member 20 is “t”, the body barrel portion 42 has a plate thickness “t” on both the left and right sides of the width of the head portion 41. It is formed narrow by the dimension corresponding to.

Therefore, the first area 21 of the long member 20 placed on the receiving jig 30 is set so as to be pushed by the head portion 41 of the pushing jig 40, and other than the long member 20 by the main body barrel portion 42 of the pushing jig 40. When the portion is pressed into the groove 31 of the jig 30 from above, the long member 20 is pressed into an outer shape that follows the groove 31, and the support frame member 10 having a constant outer width can be obtained. .
That is, the long member 20 including the first area 21, the widened second area 22, and the third area 23 having an isosceles trapezoidal shape by gradually changing the width based on the width difference between the areas is pressed. The support frame member 10 having a U-shaped cross section can be manufactured. Here, the first area 21 corresponds to the flat plate end portion 11, the second area 22 corresponds to the side wall installation portion 13, and the third area 23 corresponds to the intermediate portion 12 having the triangular side wall 15.

  In the manufacturing process described above, the head portion 41 of the pushing jig is close to the boundary between the first area 21 and the third area 23 pushed between the portion that changes to a thinner main body barrel portion 42 and the groove portion 31. The portion is twisted and deformed, and the subsequent portion is gradually pushed and bent, so that the widened portion of the third area 23 is formed on the triangular side wall 15. At this time, the vicinity of the flat plate end 11 side of the intermediate portion 12 in the support frame member 10 is twisted and deformed as described above, but the subsequent body portion 42 is thinner than the head portion 41 of the pushing jig. Since the remaining portion of the third area 23 and the second area 22 are pushed in, a structure having a U-shaped cross section can be formed along the inner wall of the groove 31.

In other words, the first area 21 on the front end side is pushed into the plate-like end portion 11 by the head portion 41 that just fits into the groove portion 31. The whole of the second area 22 and most of the third area 23 are pushed by the main body barrel part 42 that is narrower than the width of the groove part 31, and is formed into a U-shape with the same Lw as the plate-like end part 11. The
In the portion where the width changes from the head portion 41 to the main body barrel portion 42, the tip portion on the first area 21 side in particular is twisted and deformed in the third area 23, so this portion can be formed in the same manner as the others. The support frame member 10 having the same width as a whole can be reliably formed. In FIG. 2, a hatched portion HT is particularly attached to a portion formed by twisting deformation for reference.

  The pushing jig 40 includes a tapered portion 43 between the head portion 41 and the main body barrel portion 42. The third area 23 is formed longer than the tapered portion 43 in the longitudinal direction, and the pressing step is performed with the tip portion of the third area 23 on the first area 21 side corresponding to the tapered portion. As a result, the support frame member 10 having the outer shape can be formed by stably and reliably forming the twisted portion described above.

  As described above, according to the present invention, the shape is formed between the tongue-shaped flat plate end portion 11 inserted into the receiving hole provided in the tank and the side wall installation portion 13 having the left and right side walls 14a and 14b. The intermediate portion 12 that gradually changes is provided, and the overall width (length in the width direction WD) is constant between the flat plate end portion 11 and the side wall installation portion 13 as a whole. As a shape in which stress is hard to concentrate, durability can be improved and a structure stronger against external force can be obtained. Therefore, the heat exchanger employing such a support frame member 10 is excellent in durability and can provide a highly reliable heat exchanger as a result. In particular, a heat exchanger including a support frame member having a constant outer width as described above can be easily and efficiently manufactured by press working using a long member and jig having a predetermined shape as described above.

The present invention is not limited to the above-described embodiment, and various modifications can be made.
In the embodiment described above, the case of a capacitor having a tank (tanks 131 to 133) on both the left and right sides is illustrated in FIG. The arrangement form of the tank is not limited to this, and the present invention can be similarly applied to a capacitor of a type in which the tank is arranged vertically and the support frame member is located on the left and right. Moreover, this invention is applicable not only to a capacitor | condenser but the evaporator of a vehicle air conditioner.

1 Capacitor (heat exchanger)
DESCRIPTION OF SYMBOLS 10 Support frame member 11 Flat plate edge part 12 Middle part 13 Side wall installation part 14a, 14b Left and right side wall 15 Triangular side wall 20 Long member 21 1st area 22 2nd area 23 3rd area 30 Receiving jig 31 Groove part 40 Pushing Jig 41 Head portion 42 Body trunk portion 43 Tapered portion 100 Core portion CL Center axis LD Longitudinal direction WD Width direction Lt Length in the longitudinal direction of the flat plate end Lw Width of the support frame member Wt Widened width

Claims (1)

A method of manufacturing a heat exchanger comprising a reinforcing support frame member that is disposed at the periphery of a core portion that is plate-shaped and generally rectangular, and that is long and has a substantially U-shaped cross-sectional shape,
A first area formed in a first width in a plan view before processing, a second area formed in a second width that is wider than the first width and widened from the central axis by the same width, and the first Preparing a long member formed in a shape including a third area that is an isosceles trapezoid by gradually changing the width based on a width difference between the area and the second area;
A long receiving jig in which grooves of a certain width and depth are provided in a straight line, and a first shape of the long member placed on the receiving jig, the transverse shape being substantially rectangular and long. Using a pressing jig constituted by a head portion that is a portion that pushes the area and that is formed with a width that fits just into the groove portion, and a main body barrel portion that is narrower than the head portion in the same manner as the left and right. And a pressing step for forming a support frame member,
In the pressing step, when the long member placed on the receiving jig is pushed by the pushing jig, the head portion is pushed without deforming the first area of the long member, A supporting frame member having a constant outer width by bending the second area and the third area of the elongated member at the body trunk portion so that the cross-sectional shape is substantially U-shaped with the outer shape following the groove portion. To form and further
The pushing jig includes a taper portion that gradually changes the width based on a width difference between the head portion and the main body trunk portion.
In the longitudinal direction, the third area is formed longer than the tapered portion,
In the pressing step, the support frame member is formed by causing the tip portion of the third area on the first area side to correspond to the tapered portion .

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