JPH069718B2 - Heat transfer fin forming equipment - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a heat transfer fin forming apparatus, and more particularly to an air conditioner,
The present invention relates to a heat transfer fin forming apparatus suitable for forming corrugated fins of a heat exchanger including a flat heat transfer tube and corrugated fins used in a refrigerator or the like.

[Background of the Invention]

As a conventional corrugated fin, for example, the actual Kaisho 55-
There is one disclosed in Japanese Patent No. 145285, and a fin shape and a manufacturing method will be described with reference to FIGS. 10 to 12.

FIG. 10 is a schematic configuration diagram showing a mounting positional relationship of a gear-shaped cutter for forming a conventional corrugated fin, FIG. 11 is a perspective view of a main portion of the gear-shaped cutter, and FIG. 12 is a conventional corrugated fin. It is a sectional view showing a shape, and each of these figures is described in the above Japanese Utility Model Publication No. 55-145285.

As shown in FIG. 10, a pair of gear-shaped cutters 1 are brought into contact with each other at a predetermined interval, a thin fin plate is inserted between the cutters, and pressure is applied by each tooth portion 2a of each cutter piece 2, The louver 3 shown in FIG. 12 is cut and raised, and the fin plate as a whole can provide a corrugated shape along each tooth profile.

As shown in FIG. 11, this gear-shaped cutter 1 is composed of a plurality of cutter pieces 2 each having a thickness m slightly larger than the width of the louver, each of which has a gear shape. The cutter pieces 2 are fastened to each other while being slightly shifted in the circumferential direction with a predetermined advance angle.

The fin shape molded by such a gear-shaped cutter is
As shown in FIG. 12, the fin plate 4 has a central bent shape.
Is inclined with respect to the direction of the wind, and the bent portions 4a, 4
b and each louver 3 are parallel to the wind direction.

In order to improve the heat exchange efficiency between the air and the fins, the distance between the planar louvers must be reduced so that the air does not become a laminar flow.

When the distance between the louvers 3 is reduced, the manufacturing method using the gear-shaped cutter 1 makes the manufacturing of the tooth profile complicated, and
The accuracy of paired tooth profile alignment during molding was severe, and the problem of reduced work efficiency was not fully considered.

Also, a method of forming corrugated fins by a press can be considered, but it has not been put into practical use because the productivity is extremely low.

[Object of the Invention]

The present invention has been made in view of the above-mentioned conventional state of the art, and a heat transfer fin that is difficult to mold in a gear-shaped cutter,
It is an object of the present invention to provide a heat transfer fin forming apparatus capable of forming a fin shape with high dimensional accuracy and high heat exchange rate.

[Outline of Invention]

The configuration of the heat transfer fin forming apparatus according to the present invention is a corrugated heat transfer fin forming apparatus in which a fin plate is passed between a plurality of pairs of rollers and bent into a hairpin shape, and is a flat plate supplied from an uncoiler. In the longitudinal direction of the fin plate of the shape, leaving a space to form the fin space after molding, a large number of notches with a length that should be the height of the heat transfer fins after molding,
A pair of slit rollers for cutting at louver width intervals such that the positions of the ends of adjacent cuts are displaced from each other, and a pair of shaping rollers for correcting partial deformation after cutting by the slit rollers. , A pair of first and second ridges for forming louvers in a convex convex shape and a convex convex shape downward, alternately for each block of each notch to be the height of the heat transfer fin after forming.
Crest forming rollers and a pair of folding rollers for continuously bending the chevron shaped looper plate at a fin pitch of equal size, and the heat transfer formed through each of these rollers. And a means for cutting and adjusting the fin into parts of a predetermined size.

The concept of developing the present invention is as follows.

In order to improve the heat exchange rate compared to the flat louver in the conventional corrugated fin, the flat louver bent from the center is agitating the passing air, and the heat of the air transferred by contacting the heat transfer fin is transferred. It has been found based on the experimental results that the efficiency of homogenization of the above can be further improved by agitation.

Then, if the fins of such a shape are formed by the gear cutter of the prior art, it is necessary to complete all the formed shapes with one cutter, so the shape of the gear cutter becomes complicated, and the louver stands upright. The north edge part cannot be formed accurately.

Therefore, instead of using a conventional set of gear-shaped cutters to perform all forming, forming with a pair of rollers for each process and sequentially passing through each process, it is possible to accurately form fins. It is a finding of what can be done.

Example of Invention

An embodiment of the present invention will be described below with reference to FIGS. 1 to 9.

First, a new shape of the heat transfer fin molded by the heat transfer fin molding apparatus according to the embodiment of the present invention will be described with reference to FIGS. 3 to 9.

FIG. 3 is a development view of heat transfer fins formed by a heat transfer fin forming device described later, FIG. 4 is a sectional view taken along the line II of FIG. 3, and FIG. 5 is II of FIG. -II arrow sectional view, FIG.
3 is a sectional view taken along the line III-III in FIG. 3, FIG. 7 is an external perspective view of a molded corrugated heat transfer fin, FIG. 8 is a sectional view taken along line IV-IV in FIG. 7, and FIG. FIG. 8 is a perspective view showing manufacturing of a heat exchanger using the heat transfer fins of FIG. 7.

This new heat transfer fin is disclosed in Japanese Patent Laid-Open No. 59-2126.
This is described in Japanese Patent Publication No. 930.

As shown in the development view of FIG. 3, this heat transfer fin has a large number of notches, that is, slits 1 having a length L, in a direction (longitudinal direction of the fin) substantially orthogonal to the direction of the circulating air shown by the white arrow. The slits 10 are provided such that the positions of the ends thereof are displaced stepwise by a constant dimension l. In addition, many loopers 5 made by cutting
Is formed in an obtuse angle with a ridge line 6 at the center along the longitudinal direction. The louver 5 and the portions (hereinafter referred to as hairpin portions) 7 and 7 ′ where the fin spacing after molding is to be formed are connected by the inclined portions 8 formed at both ends of the louver 5.

As shown in FIG. 4, the ridge line 6 of the louver has different protruding directions for each block of the slits so that the ridge lines 6 have the same direction when the fins are bent to form a corrugated shape.

FIG. 5 is a sectional view taken along the line II-II in FIG. 3, and in this block, the cross section of each louver is in the shape of a heve and a convex chevron.

On the other hand, FIG. 6 is a sectional view taken along the line III-III in FIG.
In this block, each louver has a V-shaped cross section and a concave mountain shape.

Next, FIG. 7 shows an appearance when the bent portion 9 of FIG. 3 is bent to form a corrugated heat transfer fin. In FIG. 3, if the bending direction of the bent portion 9 is reversed at both ends of the louver 5, corrugated fins as shown in FIG. 7 are continuously formed. Since the slits 10 for forming each louver 5 are displaced in a stepwise manner, the gap 11 between the louvers is naturally formed only by bending the louvers 5 as shown in FIG. Although it is almost perpendicular to the direction of the bending line of the bent portion 9 and the slit 10 for forming the louver, for this reason, without extending or contracting the fin material,
The corrugated fins shown in FIG. 7 are naturally formed.

8 is a sectional view (one mountain) taken along line IV-IV in FIG. 8 and FIG. 7, and thus the ridge lines 6 of each louver 5 are all in the same protruding direction. In the figure, the arrows indicate the flow of circulating air.

The heat transfer fin forming apparatus described below performs a forming operation so as to complete the shape and configuration of the heat transfer fins described above. The fin plate used for this is an aluminum alloy as a base material, and As shown in FIG. 9, the surface of the brazing filler metal is fixed to the base metal so as to be in contact with the heat transfer tube 22,
It is formed of a so-called brazing sheet material.

The heat transfer tube 22 shown by the chain double-dashed line in FIG. 9 is a flat multi-hole tube (4 holes in the figure) whose base material is aluminum alloy.
Then, the corrugated heat transfer fins 2 that are bent like a hairpin
It is incorporated and brazed between the two. 9th
In the figure, white arrows indicate the direction of circulating air.

Next, a heat transfer fin forming apparatus and a forming procedure will be described with reference to FIGS.

FIG. 1 is a configuration diagram of a heat transfer fin forming apparatus according to an embodiment of the present invention, FIG. 2 is an explanatory view showing a forming procedure thereof, and reference numerals in FIGS. The same parts as are indicated by the same reference numerals.

In FIG. 1, 12 is an uncoiler for continuously supplying a fin plate wound in a coil shape, 20 is a flat plate-like fin plate supplied from the uncoiler 12, and the fin plate 20 is the same as that described above. Thus, it is a brazing sheet material using an aluminum alloy as a base material.

13 is a pair of slit rollers for making a large number of cuts or slits in the fin plate 20, 14 is a pair of shaping rollers for correcting a partial deformation after the slit roller 13 makes a slit, and 15a is a slit portion. A pair of first chevron-shaped rollers for forming an upward convex chevron-shaped louver, 15b is a pair of second chevron-shaped rollers for forming a downward convex chevron-shaped louver, 1b.
6 is a pair of folding rollers for continuously bending a fin plate having a mountain-shaped louver formed into corrugated heat transfer fins, and 17 is a shearing unit for cutting the continuously bent heat transfer fins to a predetermined size. , 18 is a parking unit for adjusting the cut heat transfer fins to a predetermined size, 18a is a packing cylinder, 21
Is a completed corrugated heat transfer fin component.

As described above, the heat transfer fin forming apparatus of the present embodiment has a configuration in which a pair of rollers are sequentially arranged for each step of heat transfer fin forming. The forming procedure for each roller is as follows. Is.

The processing in the pair of slit rollers 13 is shown in FIG. 2 (a).
Shown in.

The fin plate 20a shown in FIG. 2 (a) has an interval Pf at which a fin interval after forming should be formed in the longitudinal direction of the flat fin plate as the fin plate 20 passes between the pair of slit rollers 13. With the above remaining, a large number of slits 10 having a length L that should be the height of the heat transfer fins after forming are cut at intervals of the louver width r. The positions of the ends of the slits 10 adjacent to each other at an interval of the louver width r are cut so as to deviate from each other by a dimension l.

The processing by the pair of shaping rollers 14 is shown in FIG.

In the fin plate 20b shown in FIG. 2 (b), the fin plate 20a passes between the pair of shaping rollers 14, so that the partial deformation after the slit 10 is cut is corrected and the unnecessary protrusion 10a is corrected. It is a thing.

Molding by the pair of first crest forming rollers 15a is shown in FIG. 2 (c).

The fin plate 20c shown in FIG. 2 (c) is formed by the fin plate 20b passing through a pair of first crest-forming rollers to form a second fin plate 20c.
As shown in the enlarged cross-sectional view of FIG. (C), the louver 5 is formed in a ∧ shape, that is, an upward convex mountain shape.

Molding by the pair of second mountain forming rollers 15b is shown in FIG. 2 (d).

In the fin plate 20d shown in FIG. 2 (d), the fin plate 20c formed by the first mountain-forming roller 15a has a pair of second fin plates 20c.
2 by passing through the mountain-forming roller 15b of FIG.
The portion left as the slit 10 in (c) is a V-shaped louver 5'formed as shown in the enlarged sectional view of FIG. Convex like this,
The downwardly convex chevron-shaped louvers 5 and 5'are formed alternately for each block of slits.

The pair of folding rollers 16 are molded as shown in FIG. 2 (e).
Shown in.

The heat transfer fin 20e shown in FIG. 2 (e) is a fin plate 20d formed with upwardly convex and downwardly convex louvers 5, 5 '.
However, by passing through the bending roller 16, the corrugated heat transfer fins are formed by being continuously bent into a hairpin shape at an equal fin pitch.

The corrugated heat transfer fins 20e formed by passing through the respective rollers in this manner are cut into a predetermined size by the shearing unit 17 and adjusted by the packing unit into the heat transfer fin components 21 of the second size. As shown in Fig. (F), the heat transfer fin forming operation is completed.

As described above, the heat transfer fin forming apparatus according to the present embodiment includes the flat fin plate 20 to the corrugated heat transfer fin component 21.
Since the slit roller 13 including a pair of rollers, the shaping roller 14, the first and second mountain forming rollers 15a and 15b, and the bending roller 16 are sequentially arranged in each process up to the forming of, The corrugated heat transfer fins can be formed with high efficiency and high accuracy by the work procedure described above.

In addition, the interval for each process is the elongation of the material during fin forming,
The distance is adjusted to correspond to the deformation.

The new heat transfer fin shape formed by this device has a maximum louver cut as described in Japanese Patent Laid-Open No. 59-212693, and the gap 11 between the louver and the louver is large.
Since the accuracy of (dimension l) can be secured, the heat transfer performance of the fin has been greatly improved. The heat of the heat exchanger of the air conditioner, refrigerator, etc., consisting of this corrugated heat transfer fin and the flat heat transfer tube, has been improved. The transmission performance can be greatly improved.

〔The invention's effect〕

As described above, according to the present invention, a heat transfer fin forming apparatus capable of forming a heat transfer fin, which is difficult to form with a gear-shaped cutter, into a fin shape with high dimensional accuracy and high heat exchange rate. Can be provided.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a heat transfer fin forming apparatus according to an embodiment of the present invention, FIG. 2 is an explanatory view showing a forming procedure thereof, and FIG.
The figure is a development view of the heat transfer fins molded by the apparatus of FIG.
4 is a sectional view taken along the line I-I of FIG. 3, and FIG.
II-II arrow sectional view of the figure, FIG. 6 is a III-III arrow sectional view of FIG. 3, FIG. 7 is an external perspective view of a molded corrugated heat transfer fin, and FIG. 8 is 7 is a sectional view taken along line IV-IV in FIG. 7, FIG. 9 is a perspective view showing the production of a heat exchanger using the heat transfer fins in FIG. 7, and FIG. 10 is a gear for forming a conventional corrugated fin. FIG. 11 is a schematic perspective view showing a mounting position relationship of the tooth-shaped cutter, FIG.
FIG. 12 is a sectional view showing the shape of a conventional corrugated fin. 5, 5 '... Louver 7, 7' ... Hairpin part 9 ... Bent part 10 ... Slit 12 ... Uncoiler 13
... Slit roller 14 ... Shaping roller 15a ... First mountain forming roller 15b ... Second mountain forming roller 16 ... Bending roller 17 ... Shearing unit 18 ... Packing unit 18a ... Packing cylinder 20, 20a, 20b, 20c, 20d ...
Fin plate 20e ... Heat transfer fin 21 ... Heat transfer fin component.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Eiji Maeda 390 Muramatsu, Shimizu-shi, Shizuoka Hitachi, Ltd. Shimizu Plant (72) Inventor Toshio Hatada 603, Jinmachi, Tsuchiura-shi, Ibaraki Hiritsu Seisakusho Co., Ltd. In-house

Claims (1)

[Claims] 1. A corrugated heat transfer fin forming apparatus for bending a fin plate into a hairpin shape by passing it between a plurality of pairs of rollers, wherein the fin plate is fed from an uncoiler in the longitudinal direction. After forming, leaving a space to form the fin space, make a number of notches with a length that should be the height of the heat transfer fins after molding,
A pair of slit rollers for cutting at the intervals of the louver width so that the positions of the ends of adjacent cuts are displaced from each other, and a pair of shaping rollers for correcting partial deformation of the cut portions by the slit rollers. , A pair of first and second ridges for forming louvers in a convex convex shape and a convex convex shape downward, alternately for each block of each notch to be the height of the heat transfer fin after forming.
The pair of folding rollers for continuously bending the mountain-forming roller and the fin plate formed with the mountain-shaped louver at a fin pitch of equal size, and the heat transfer fins formed by passing through each of these rollers. A heat transfer fin forming apparatus, comprising: a means for cutting and adjusting a component of a predetermined size.