JP2020034236A - Corrugated fin and manufacturing method thereof - Google Patents

Abstract

To provide a corrugated fin with a louver that has a long fin width.SOLUTION: A corrugated fin has a plurality of cut-and-raised louvers. These louvers form a plurality of groups separated in a width direction of the fin. When the length of the group having the maximum length in the width direction is Lmax, and the lengths of the other groups in the width direction are Ln (n is an integer of 2 or more) for the plurality of groups, Lmax/Ln>1.5 is established for all Ln.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a corrugated fin having a louver for a heat exchanger and a method for manufacturing the corrugated fin.

The corrugated fins with louvers constituting the core of the heat exchanger are manufactured by supplying a thin metal strip between a pair of forming rolls meshing with each other. Then, the metal strip is formed in a waveform that progresses in the supply direction.
The corrugated fin has a rising surface and a falling surface alternately arranged, and has a top portion and a valley portion connecting them in a wave-like manner. Then, on the rising surface and the falling surface, a louver group in which a large number of louvers are cut and raised in the width direction of each surface is formed by a louver forming blade group having a sawtooth cross section arranged on the outer periphery of each forming roll. Is done.

As the corrugated fins with louvers as described above, those having various fin pitches and fin widths (core thicknesses) have been manufactured to meet the performance required for them.
Here, the fin pitch of the corrugated fins can be handled by adjusting the width of the corrugated fins to some extent (for example, a fin pitch of 3 mm to 4 mm) even by using the same molding machine. However, when forming corrugated fins having different fin widths, it is necessary to use separate forming rolls that are different for each fin width. For this reason, a large amount of expense was required for the dies for manufacturing the forming rolls, the manufacturing of the forming rolls, the installation of the forming rolls, and the maintenance and management thereof.

  Accordingly, an object of the present invention is to provide a louvered corrugated fin capable of coping with many required performances with a minimum required variation, and to provide a method of manufacturing a louvered corrugated fin that can be manufactured at a low cost. I do.

The present invention according to claim 1 is a corrugated fin having a plurality of cut and raised louvers,
These louvers form a plurality of groups separated in the width direction of the fin,
When the length of the group having the maximum length in the width direction is Lmax, and the length of the other groups in the width direction is Ln (n is an integer of 2 or more). ,
A corrugated fin characterized by satisfying Lmax / Ln> 1.5 for all Ln.

According to a second aspect of the present invention, in the method for manufacturing a corrugated fin according to the first aspect,
Having a plurality of louver forming blade groups separated from each other in the axial direction of the forming roll,
Assuming that the widths of the forming rolls of the group of louver forming blades in the axial direction are Ln (n is an integer of 2 or more), a plurality of louver forming blades are provided on one forming roll 4 where L1 =... A corrugated fin manufacturing method characterized in that a plate material 5 having a width corresponding to the total size of a group is supplied to form a corrugated fin.

According to the first aspect of the present invention, among the plurality of louver groups cut and raised in the width direction of the fin, the length of the group having the maximum length in the width direction of the fin is set to Lmax, and the other width is set to Lmax. Assuming that the length of the group in the direction is Ln, Lmax / Ln> 1.5 holds for all Ln.
By setting the length of the louver group in this way, it is possible to obtain a corrugated fin with a louver having a specification corresponding to a wide range of required performance (heat transfer characteristics) without excess or shortage.

  According to the second aspect of the present invention, since one forming roll 4 has a plurality of louver forming blade groups having different widths, the fin has a plurality of louver groups having different widths corresponding to the louver forming blade groups. Louvered corrugated fins of different widths can be manufactured from a single forming roll. Therefore, the manufacturing cost of the mold, the manufacturing cost of the forming roll, the installation cost of the forming roll, and the maintenance cost of the forming roll, which were conventionally required, are reduced. Therefore, there is a remarkable effect that each cost involved in manufacturing the louver fin is reduced.

1A is a perspective view showing a method for manufacturing a louvered corrugated fin according to a first embodiment of the present invention, and FIG. 2B is a perspective view of a main part of a louvered corrugated fin manufactured by the method, and FIG. FIG. The perspective view (A) which shows the manufacturing method of the corrugated fin with a louver of the 2nd Embodiment, the principal part perspective view (B) of the corrugated fin with a louver manufactured by the method, and CC arrow of (B). Schematic cross-sectional view (C). The perspective view (A) which shows the manufacturing method of the corrugated fin with a louver of the 3rd Embodiment, the principal part perspective view (B) of the corrugated fin with a louver manufactured by the method, and CC arrow of (B). Schematic cross-sectional view (C). Heat dissipation curve for the fin width of the corrugated fin.

Next, an embodiment of the present invention will be described.
In the corrugated fin of the present invention, rising surfaces and falling surfaces having a fin width are alternately arranged, and a top portion and a valley portion connecting them in a wave shape are formed. A large number of louvers are formed on the rising surface and the falling surface in the width direction of those surfaces.
The fin width is the length of the corrugated fin with louver 7 in FIGS.
When this louver-equipped corrugated fin 7 is applied to a heat exchanger, an air flow flows in the width direction of the corrugated fin 7. Then, the thickness of the core of the heat exchanger matches the width of the corrugated fins 7 with louvers.

In the case of such corrugated fins with louvers, as the fin width is increased, the value of the heat radiation characteristics (the heat radiation amount of the heat exchanger taking into account the decrease in the flow rate of the air flow passing through the fin due to the pressure loss is indexed) Increased).
FIG. 4 shows the respective characteristic curves when the fin width is plotted on the horizontal axis and the heat radiation characteristic is plotted on the vertical axis, and the fin pitch Pf (the interval between adjacent tops) is 3 mm, 3.5 mm, and 4 mm.

In FIG. 4, the heat radiation characteristic value at the fin width 1 is in the range of 18 to 24 which is a value on the straight line of the fin width 1, and a heat exchanger in that range can be provided.
Considering the fin width at which a heat exchanger having a heat radiation characteristic value of 24 or more can be provided, it can be considered that the fin width 2 at which the heat radiation characteristic value is 24 is equivalent in a graph in which the fin pitch Pf is 4 mm.
At the fin width 2, the heat radiation characteristic value on the straight line is 24 to 30. Similarly, for the fin width 3, the heat radiation characteristic value is 30 to 35, for the fin width 4, the heat radiation characteristic value is 35 to 38, for the fin width 5, the heat radiation characteristic value is 38 to 42, and for the fin width 6, the heat radiation characteristic value is Can provide a heat exchanger in the range of 42 to 44.

As described in the problem to be solved by the invention, when the fin width is increased, a plurality of flat portions are required between both ends in the width direction of the fin and between the louvers to maintain the shape of the corrugated fin with louvers. Come.
The corrugated fin of the present invention is characterized in that a plurality of louver groups separated in the width direction of the fin are formed, and a flat portion is formed between the louver groups. On the other hand, when a plurality of flat portions are provided, the heat radiation performance is reduced accordingly. Then, the inventor found the relationship between the louver groups of corrugated fins that can maintain the heat radiation characteristic value of the heat exchanger with respect to the length in the width direction of the plurality of louver groups.

When the length of the group having the maximum length in the width direction among the plurality of louver groups is Lmax, and the lengths of the other groups in the width direction are Ln (n is an integer of 2 or more), It has been found that when the louver group is formed such that Lmax / Ln> 1.5 is satisfied for Ln, a louver-equipped corrugated fin having specifications corresponding to a wide range of heat radiation characteristics can be obtained.
Here, when Lmax / Ln> 1.5 is transformed, (Lmax / 1.5)> × Ln.
This means that, for example, if Lmax is 30 mm, the length Ln in the width direction of the other louver groups needs to be shorter than 20 mm.

Next, a corrugated fin forming apparatus having a forming roll for manufacturing a corrugated fin having a louver group will be described.
As shown in FIG. 1, the corrugated fin forming apparatus (not shown) has a pair of upper and lower forming rolls 4, and one of the forming rolls includes a plurality of louvers separated from each other in the axial direction of the forming rolls. A group of forming blades is arranged. In these louver forming blade groups, when the width of the forming roll in the axial direction is Ln (n is an integer of 2 or more), L1 =... = Ln is not satisfied.

  In the case of obtaining the corrugated fin having the above-described characteristics, the louver forming blade group is configured such that the group having the largest width in the axial direction has a maximum width of Lmax, and the other groups have a width in the axial direction of Ln (n is 2 or more). (Integer), all Ln can be obtained by forming Lmax / Ln> 1.5.

1 (A), 2 (A), and 3 (A) show an example of one of the forming rolls.
In the example of FIGS. 1A to 3A, the first louver forming blade group 1, the second louver forming blade group 2, and the third louver forming group having a plurality of different widths are separated from each other in the axial direction of the forming roll. One forming roll 4 is formed by the blade group 3.
As an example, the width of the first louver forming blade group 1 can be 30 mm, the width of the second louver forming blade group 2 can be 19 mm, and the width of the third louver forming blade group 3 can be 15 mm. The portion where the louver forming blade group is not formed corresponds to the flat portion of the corrugated fin.
As described above, a plurality of louver forming blade groups are formed on one forming roll so as to be spaced apart from each other in the axial direction, and the width of each louver forming blade group in the axial direction of the forming roll is set to Ln (where n is 2). If L1 = ... = Ln, the corrugated fins of the required length are supplied by supplying the plate material 5 having a width corresponding to the total size of the plurality of louver forming blade groups. There is an effect that can be obtained reasonably.

Next, a method of manufacturing a corrugated fin using one forming roll will be described.
The corrugated fin can be obtained by supplying a plate member 5 having a width corresponding to the total size of a plurality of louver forming blade groups to one forming roll 4.
In the embodiment of FIG. 1, the width A (see FIG. 1A) of the plate material 5 supplied to one forming roll 4 is equal to the entire width of the forming roll 4. The pair of upper and lower forming rolls 4 oppose each other with a gap corresponding to the plate thickness of the plate 5, and the plate 5 is continuously supplied to the gap.

A first louver group 1a having a length corresponding to the width of the first louver forming blade group 1, a second louver group 2a having a length corresponding to the width of the second louver forming blade group 2, and a third louver forming blade group The third louver group 3 a having a length corresponding to the width of the third louver 3 is formed on the plate 5.
In the cross section of the formed corrugated fin, as shown in FIG. 1C, flat portions 6 are formed at both ends of each of the louver groups 1a, 2a, 3a. The directions of the many louvers 8 of the first louver group 1a, the directions of the many louvers 8 of the second louver group 2a, and the directions of the many louvers 8 of the third louver group 3a are different from each other. Can be formed.
The orientation of each louver group of corrugated fins can be formed in one direction by changing the design of the louver forming blade of the forming roll.

Next, FIG. 2 shows a manufacturing method according to a second embodiment of the present invention, in which a sheet material 5 having a smaller width than that of the above embodiment is supplied between the forming rolls 4.
The width B (see FIG. 2A) of the plate material 5 supplied in this example is the width of the first louver forming blade group 1, the width of the second louver forming blade group 2, and the middle and both end blade groups. It is the sum with the width of the part without the mark. The formed corrugated fins have a length corresponding to the width of the first louver forming blade group 1 and a length corresponding to the width of the second louver forming blade group 2 as shown in FIG. The second louver group 2a and flat portions 6 are formed at both ends of the louver groups 1a and 2a.

Next, FIG. 3 shows a manufacturing method according to a third embodiment of the present invention, in which the fin width C (see FIG. 3A) of the plate material 5 supplied to the pair of forming rolls 4 is changed to the first louver forming blade 1. And the width of the flat portion 6 formed on both sides thereof.
In this example, in the manufactured corrugated fins 7 with louvers, each louver 8 is inclined only in one direction.

In the embodiment of the forming roll 4, the first louver forming blade 1, the second louver forming blade 2, and the third louver forming blade 3 are arranged in parallel in the axial direction of the forming roll. However, the present invention is not limited to this, and it is possible to add fourth, fifth, and sixth louver forming blades.
The corrugated fins 7 with louvers formed as shown in FIGS. 1 to 3 are obtained by appropriately compressing their fin pitch Pf (see FIG. 1A) in the traveling direction of the corrugated fin waves. It can be formed into various fin pitches.

  The present invention relates to a corrugated fin with a louver for a heat exchanger. These fins can be used as fins for various heat exchangers such as a heat exchanger for cooling engine cooling water, an oil cooler, a heat exchanger for air conditioning, and an intercooler.

Reference Signs List 1 first louver forming blade group 1a first louver group 2 second louver forming blade group 2a second louver group 3 third louver forming blade group 3a third louver group 4 forming roll

Reference Signs List 5 plate material 6 flat part 7 corrugated fin with louver 8 louver A fin width B fin width C fin width Pf fin pitch

Claims (2)

A corrugated fin having a plurality of cut and raised louvers,
These louvers form a plurality of groups separated in the width direction of the fin,
When the length of the group having the maximum length in the width direction is Lmax, and the length of the other groups in the width direction is Ln (n is an integer of 2 or more). ,
A corrugated fin wherein Lmax / Ln> 1.5 is satisfied for all Ln. The method for manufacturing a corrugated fin according to claim 1,
Having a plurality of louver forming blade groups separated from each other in the axial direction of the forming roll,
Assuming that the width of the forming rolls of the louver forming blade group in the axial direction is Ln (n is an integer of 2 or more), a plurality of the louvers are provided on one forming roll (4) where L1 =. A method of manufacturing a corrugated fin, comprising supplying a plate material (5) having a width corresponding to the total size of a forming blade group to form a corrugated fin.

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