JPH1194486A - Inner fin for heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an inner fin for heat exchanger being contained in a tube for heat exchanger in which the dimensional accuracy of height between the crest and the bottom of a fin body is enhanced significantly as compared with a conventional one. SOLUTION: The inner fin for heat exchanger comprises a fin body 11 having crests 11a and bottoms 11b formed by waving a plate material wherein a groove 11c is made in the plate material along a position on the inside of the crest 11a and the bottom 11b of the tin body 11 so that the plate material is bent along the groove 11c.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner fin for a heat exchanger used and housed in a tube for a heat exchanger.

[0002]

2. Description of the Related Art Conventionally, in a heat exchanger such as an intercooler, an oil cooler, and a condenser of an automobile, an inner fin for a heat exchanger is accommodated in a tube for the heat exchanger, and a heat exchange efficiency is obtained by stirring a fluid in the tube. Improvements have been made. FIG. 7 shows this type of inner fin for a heat exchanger. The inner fin 1 for a heat exchanger is accommodated in a flat tubular heat exchanger tube 2.

[0003] The fin body 3 of the inner fin 1 for a heat exchanger is formed by forming a plate material into a wave shape, and has a peak portion 3a and a valley portion 3b. On the other hand, the tube 2 and the fin body 3 are made of aluminum.
a and the outside of the valley 3b are brazed to the inner surface of the tube 2.

[0004]

However, in such a conventional inner fin for a heat exchanger, it is difficult to increase the accuracy of the height H between the peak 3a and the valley 3b of the fin body 3. Yes, due to the variation of the height dimension H,
There has been a problem that it is difficult to securely braze the outside of all the peaks 3a and the valleys 3b to the inner surface of the tube 2.

[0005] That is, conventionally, such an inner fin for a heat exchanger has, as shown in FIGS. 8A and 8B, a corrugated crest 4 a and a valley 4 b formed on a plate 4. The pitches P1 and P2 are manufactured by successively reducing the pitches by roll processing. In such a manufacturing method,
A relatively large variation occurs in the height dimension H between the peak 3a and the valley 3b of the final fin body 3.

The present invention solves such a conventional problem, and provides an inner fin for a heat exchanger in which the accuracy of the height dimension between the peak and the valley of the fin body can be greatly improved as compared with the prior art. The purpose is to do.

[0007]

According to a first aspect of the present invention, there is provided an inner fin for a heat exchanger, wherein a plate material is formed in a wave shape to form a fin body having peaks and valleys. A groove is formed along a position inside the crests and valleys of the fin body in the plate, and the plate is bent along the groove.

[0008] The inner fin for a heat exchanger according to claim 2 is
2. The inner fin for a heat exchanger according to claim 1, wherein the concave groove is formed at two intervals at the peak and the valley with an interval. 3.

The heat exchanger inner fin according to claim 3 is
The inner fin for a heat exchanger according to claim 1 or 2, wherein the plate material is made of an aluminum clad material, and a brazing material layer is formed on both sides of the core material.

(Function) In the inner fin for a heat exchanger according to the first aspect, a concave groove is formed along a position inside the peak and the valley of the fin body in the plate material, and the plate material is folded along the concave groove. By bending, peaks and valleys are formed.

In the heat exchanger inner fin according to the second aspect, two concave grooves are formed in the crest and the valley at an interval, and the two concave grooves are bent to form the crest. And the valleys are formed flat. In the inner fin for the heat exchanger according to the third aspect, the outer sides of the peaks and valleys of the fin body made of the aluminum clad material are brazed to the inner surface of the tube for the heat exchanger.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of an inner fin for a heat exchanger of the present invention. In this embodiment, the fin main body 11 is formed by forming a plate material into a wave shape, and includes a peak 11a and a valley 11b.

A concave groove 11c having a rectangular cross section is formed along a position inside the peak 11a and the valley 11b of the fin body 11. As shown in FIG. 2, the inner fins for a heat exchanger pass the plate 13 sequentially between a pair of first rolls 15, a pair of second rolls 17, and a pair of third rolls 19. It is manufactured by

That is, first, a pair of first rolls 15
3 (a) by passing the plate material 13 between them.
As shown in the figure, the concave groove 11 extends along the position inside the peak 11a and the valley 11b of the fin body 11 in the plate material 13.
c is formed. In this embodiment, a plate 13 made of aluminum clad and having a brazing material layer formed on both sides of the core is used as the plate 13.

A pair of first rolls 15 are provided at predetermined intervals with protrusions 15 having a shape corresponding to the concave grooves 11c.
a is formed, and the protruding portion 15a is pressed against the plate 13 to form the concave groove 11c. Next, by passing the plate 13 between the pair of second rolls 17, the plate 13 is formed into a wavy shape as shown in FIG. 3B, and a crest 13a and a valley 13b are formed. Is done.

That is, at this time, the plate material 13 is bent along the concave groove 11c, and a peak portion 13a and a valley portion 13b are formed. The height H1 of the peaks 13a and the valleys 13b at this time is set to about half of the final height H0. Next, by passing the plate material 13 between the pair of third rolls 19, as shown in FIG.
The pitch between the valley portion 11b and the valley portion 11b is narrowed to form a ridge portion 11a and a valley portion 11b having a predetermined height dimension H0.

The heat exchanger inner fin manufactured as described above is housed in a heat exchanger tube 21 as shown in FIG. Then, in this state, the brazing material layer formed on the plate 13 is brazed in the heat treatment furnace, and the ridges 11 a and the valleys 11 of the fin body 11 are melted.
The outside of b is brazed to the inside of the tube 21.

At this time, due to the molten brazing material,
The concave groove 11c is filled. In the inner fin for a heat exchanger configured as described above, since the concave groove 11c is formed along the position inside the ridge 11a and the valley 11b of the fin body 11 in the plate member 13, the groove 11c is formed along the concave groove 11c. The plate 13 is securely bent, and the peak 11a and the valley 11b
Is formed, the accuracy of the height dimension H0 between the crests 11a and the valleys 11b of the fin body 11 can be significantly increased compared to the conventional case.

Therefore, the outer sides of the peaks 11a and the valleys 11b formed on the fin body 11 can be securely brazed to the inner surface of the tube 21. Further, in the above-described inner fins for a heat exchanger, the plate material 13 that forms the fin body 11 is a plate material made of an aluminum clad material and a brazing material layer is formed on both sides of a core material, so that a tube for a heat exchanger is used. The outer surfaces of the ridges 11a and the valleys 11b of the fin body 11 can be easily and reliably brazed to the inner surface of the fin 21.

FIG. 5 shows a second embodiment of the inner fin for a heat exchanger according to the present invention. In this embodiment,
Two concave grooves 23c and 23d are formed at intervals between the peak 23a and the valley 23b of the fin body 23. The fin body 23 has the two grooves 23c, 2c.
By bending 3d, the crests 23a and the valleys 23 are formed.
b is formed flat.

In this inner fin for a heat exchanger, first, as shown in FIG.
The two concave grooves 23c and 23d are formed at intervals along the positions inside the peaks 23a and the valleys 23b of the fin body 23 in FIG. Then, in substantially the same manner as in the first embodiment, the plate material 13 is formed into a corrugated shape by roll processing.

In this embodiment, the grooves 23c, 23d
Are formed in the crests 23a and the valleys 23b at intervals, and the crests 23a and the valleys 23b are formed flat by bending the two grooves 23c and 23d. Thus, the contact area of the peak 23a and the valley 23b with the inner surface of the tube 21 can be increased.
Accordingly, the ridges 23 a and the valleys 23 b of the fin body 23 can be more reliably brazed to the inner surface of the tube 21.

In the above embodiment, the grooves 11
Although an example in which c, 23c, and 23d are formed in a rectangular shape has been described, the present invention is not limited to this embodiment, and may be formed in, for example, a V shape, an arc shape, an R shape, or the like.

[0024]

As described above, in the inner fin for the heat exchanger according to the first aspect, the concave groove is formed along the position inside the peak and the valley of the fin body in the plate material.
Since the plate material is reliably bent along the concave grooves and the ridges and valleys are formed, the accuracy of the height dimension between the ridges and valleys of the fin body is greatly improved compared to the conventional case. Can be.

In the inner fin for a heat exchanger according to the second aspect, since two concave grooves are formed in the crest and the valley at an interval, the two concave grooves are bent so that the crest is formed. The ridges and valleys are formed flat, so that the contact area of the ridges and valleys with the inner surface of the tube can be increased. In the heat exchanger inner fin according to the third aspect, since the plate material forming the fin body is made of aluminum clad material and the brazing material layer is formed on both sides of the core material, the inner surface of the tube for the heat exchanger is used. In addition, the outside of the peaks and valleys of the fin body can be easily and reliably brazed.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of an inner fin for a heat exchanger of the present invention.

FIG. 2 is an explanatory view showing a method of manufacturing the inner fin for the heat exchanger of FIG. 1;

FIG. 3 is an explanatory view showing a method for manufacturing the inner fin for the heat exchanger of FIG. 1;

FIG. 4 is a cross-sectional view showing a state where the inner fin for the heat exchanger of FIG. 1 is housed in a tube for a heat exchanger.

FIG. 5 is a sectional view showing a second embodiment of the inner fin for a heat exchanger of the present invention.

FIG. 6 is an explanatory view showing a method of forming a concave groove in the inner fin for a heat exchanger of FIG. 5;

FIG. 7 is a cross-sectional view showing a state where a conventional inner fin for a heat exchanger is housed in a tube for a heat exchanger.

FIG. 8 is an explanatory view showing a method for manufacturing a conventional inner fin for a heat exchanger.

[Explanation of symbols]

 11, 23 Fin body 11a, 23a Crest portion 11b, 23b Valley portion 11c, 23c, 23d Groove 13 Plate material

Claims (3)

[Claims] The plate material (13) is formed in a wavy shape to form a crest (1).
1a, 23a) and a fin body (11, 23) having a valley (11b, 23b), wherein the fin body (11, 23) in the plate (13) is provided.
3) The peaks (11a, 23a) and the valleys (11b, 23)
The groove (11c, 23c,
23b) is formed, and the grooves (11c, 23c, 23) are formed.
An inner fin for a heat exchanger, wherein the plate (13) is bent along (b). 2. The inner fin for a heat exchanger according to claim 1, wherein two of the concave grooves (23c, 23b) are formed at an interval between the peak (23a) and the valley (23b). An inner fin for a heat exchanger, comprising: 3. The inner fin for a heat exchanger according to claim 1, wherein the plate (13) is made of an aluminum clad material, and a brazing material layer is formed on both sides of the core material. Inner fin for heat exchanger.