JPH0347641A - Manufacture of needle fins - Google Patents

Abstract

PURPOSE:To obtain needle fins excellent in thermal efficiency by cutting slit grooves on a hoop in the lengthwise direction, corrugating them, separating slits on its inclined parts completely, dividing the formed needle part into three lines in the lengthwise direction and compressing a lengthwise pitch. CONSTITUTION:Plural slit grooves 12 are cut in the lengthwise direction of the hoop 10, a material between them is rounded, then, corrugated and the slit grooves 12 on the corrugated inclined parts are separated. Then, the hoop is divided at least into three lines in its lengthwise direction. Each of divided parts of the hoop 10 is formed in the shape of a needle by the roundness given when the slit grooves are cut previously and the interval between them can be set freely within a certain range and therefore needle fins having an interval (a fin pitch) each exceeding three times the fin diameter desired from the point of view of heat transfer performance can be mass-produced. Consequently, it is possible to compact a heat exchanger by mass-producing needle fins large in thermal efficiency.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method for manufacturing air side fins for heat exchangers.

[Conventional technology]

Conventionally, louvered fins 15a as shown in FIG. 4 have been mainly used as air side fins for heat exchangers. This is a louver made by corrugating (wavy folding) the hoop material pulled out from the coil, cutting slits in the longitudinal direction on the sloped part, and raising it diagonally to form a louver.The manufacturing process is shown in Figure 6. show. In the figure, the hoop material 10 is first passed through the louver cutters 6a and 6b to form the shape shown in the figure, and compressed in the direction of travel with the fin restraint jig 7 in front of the fin crest counter 8 to shorten the fin pitch. By counting the number of fin ridges with the fin ridge counter 8, the fins are advanced by a predetermined number and cut with a cutter 989b to obtain the fins 15a of a predetermined length.

[Problem to be solved by the invention]

The conventional fin manufacturing method described above has the following problems to be solved.

I'm trying to measure the needle-like shape. In order to make reduced-width louvers using the conventional method, the problem is whether or not a louver cutter can be manufactured, which becomes impossible when the size is extremely reduced, and even more so for needle-shaped louvers. It needs to be opened and placed, and there was no technology to mass-produce products with this shape.

In the case of needle-like fins, the fin pitch must be at least three times the fin width in view of heat transfer performance. As a method of forming the fins 15b spaced apart from the hoop material, punching as shown in FIG. 5 is also available, but the yield is extremely poor and this method is not suitable for mass production.

The present invention aims to solve these problems and provide a method for mass-producing needle-like fins.

(Means for Solving the Problems) The present invention provides the following (1) to (3) as means for solving the above problems.
The present invention is intended to provide a method for manufacturing needle-like fins as shown in each section.

(1) A first step of carving a plurality of slit grooves along the longitudinal direction of the supplied hoop material and rounding the gaps between them, and corrugating the hoop material with the slit grooves carved into it, and slit grooves in the sloped part of the hoop material. The second step is to completely separate the slit grooves of the corrugated hoop material, and the needle-like portions formed by separating the slit grooves of the corrugated hoop material are separated at least three times in the longitudinal direction.
A needle-like fin manufacturing method comprising a third step of branching into rows, and a fourth step of compressing the longitudinal pitch of the needle-like portions branched into at least three rows to a predetermined pinch dimension. Method.

(2) The method for manufacturing needle-like fins according to (1) above, wherein in the first step, a plurality of slit grooves are continuously cut into the hoop material along its longitudinal direction.

(3) In the first step, a non-slit part is provided in the hoop material with a pitch equal to the length between the crests and troughs, and guide holes are drilled on both edges of the part, and between the non-slit parts. (1) above, characterized in that a plurality of slit grooves are cut along the longitudinal direction of the hoop material, and in the second step, corrugate molding is performed while aligning the peaks and valleys using the guide holes. The needle-like fin manufacturing method described in .

[Effect]

Since the present invention is configured as described above, it has the following effects.

(1) In the configuration of (1) above, a plurality of slit grooves are cut in the longitudinal direction of the hoop material, the slit grooves are corrugated, and the slit grooves on the inclined part of the corrugation are separated.
Since the hoop material branches into at least three rows in the longitudinal direction,
Each part of the branched hoop material is formed into a needle shape by the roundness imparted in advance when the slit grooves are carved, and the interval between them can be set arbitrarily within a range, so that the fin diameter is at least three times the desired fin diameter in terms of heat transfer performance. It is possible to mass-produce needle-like fins having a spacing (fin pitch) of .

In addition, since it includes a step of compressing the needle-like fin portions of the corrugate having needle-like fins formed in at least three rows to a predetermined pitch, the needle-like fins at one end of the corrugate and the needle-like fins at the other end of the corrugate are compressed to a predetermined pitch. The width between the fins can be set arbitrarily.

(2) In the configuration of (2) above, the slit grooves are continuously carved in the longitudinal direction of the hoop material, so even if a corrugate with an extremely small pitch is molded, slit grooves will always exist on the sloped part. Therefore, it is possible to obtain needle fins with a very small corrugated pitch, in other words, a very large number of needle fins per unit length in the corrugated pitch direction.

(3) In the configuration of (3) above, when corrugated molding is performed, non-slit portions are provided in the portions that will become peaks and portions that will be troughs, and guide holes are provided on both edges of the non-slit portions. Since the positions of the crests and troughs are aligned using the ridges, the position of the needle fin relative to the corrugate can always be accurately obtained without variation.

〔Example〕

A first embodiment of the method according to claims (1) and (2) of the present invention will be described with reference to FIG.

In the figure, the hoop material IO is first pulled out from the coil 5, and when it passes through the grooving rolls la and lb, slit grooves 12 are carved as shown in figures (b) and (c), and the cross section becomes needle-like. However, since the uncut portion of the slit groove 12 in the plate thickness direction is made large, the slit groove 12 will not be separated by a small force. The grooved hoop material IO enters preliminary full gate rolls 2a and 2b made by slightly shifting the corrugated teeth, and is formed into a corrugated shape, and the sloped portion is completely separated as shown in Figures (b) and (e). be done.

Next, the bending and extruding rolls 3a and 3b are introduced, and the waveform is pre-curved.
The sloped portion of the molded and completely separated product is branched into three rows to form needle-like fins 11, as shown in Figure (f). Spare corrugated roll 2a and bending extrusion roll 3
b are in mesh with each other, and the corrugated hoop material 10 is conveyed in contact with the outer periphery of the preliminary corrugated roll 2a, and is transferred onto the bending and extrusion roll 3b which is in mesh with the preliminary corrugated roll 2a, where it is bent and extruded. . The needle-like fins 11 branched into three rows form a fin pitch compression device 4.
The fin pitch is compressed to a predetermined size, and
By counting the number of fin ridges and cutting them where necessary, the desired heat exchange fin 1B is completed.

Next, a second embodiment of the method according to claim (3) of the present invention will be described with reference to FIG. In order to avoid redundancy, the explanation of the steps similar to those in the first embodiment will be omitted, and the explanation will mainly focus on the steps different from the first embodiment. Regarding the apparatus used, parts similar to those in the first embodiment are given the same reference numerals, and explanations thereof will be omitted.

In FIG. 2, the hoop material 10 is grooving roll 1 c
After passing through +1d, a slit groove 12a is carved as shown in Figures (b) and (C), and the cross section becomes round like a needle.
At the same time, the length of the following peak and valley ■ is used as the pitch, and the hoop material 10
Guide holes 14 are formed at both edges of the hoop material 10, and these portions become non-slit portions 13 in a direction perpendicular to the longitudinal direction of the hoop material IO. The grooved hoop material IO enters preliminary corrugated rolls 2c and 2d and is shaped into a waveform as shown in Figure (C). At that time, spare corrugated rolls 2c, 2d
The synchronization pin (Fig. 3 (b)) provided in the guide hole 14
The position of the crests and troughs of the waveform and the slit groove 12a is determined accurately. Next, the bending and extruding rolls 3a and 3b are introduced, and as in the case of the first embodiment, FIGS.
Wave-shaped needle-like fins 11 shown in (gl) are formed in each step and finally cut to obtain fins 15.

According to this embodiment, the preliminary corrugated roll 2 c +2
d and the guide hole 14 are engaged with each other, so the relationship between, for example, the slit groove 12a, the non-slit portion 13, and the peaks and valleys of the waveform (corrugate) is always accurate, and the relationship between the acicular fin 11 and the fin 15 is always accurate. It has the advantage that there is no variation with corrugate.

FIG. 3 shows a grooving roll 1a used in the first and second embodiments.
= 1d, an example of the tooth shape of the preliminary corrugated rolls 2c, 2d, etc., and a schematic diagram of the fin pitch compression device 4. Figures (A) and (B) are the first embodiment, and Figure (a).

(B) shows each tooth profile of the second embodiment, and Figure (C) shows the tooth profile common to each of the first and second embodiments. (1) is a fin pitch compression device 4 common to the first and second embodiments.

As described above, according to the first and second embodiments, the hoop material 10
The slit grooves 12.12a carved in the slit grooves 12.12a are placed on top of the corrugated molding, and are branched in at least three rows in the longitudinal direction of the hoop material 10, that is, in the direction of the slit grooves, to form the needle-like fins 11. There is an advantage that the distance between the fins can be kept sufficiently large, for example, three times the diameter of the fins or more, and fins with extremely high heat transfer performance can be obtained.

Furthermore, since all of the fins can be manufactured using a rotating roll-based manufacturing device, it also has the advantage of being excellent in mass productivity.

Furthermore, as mentioned above, since highly efficient needle-like fins can be mass-produced, small, high-performance fins can be obtained at low cost, and the heat exchanger can be made cheaper and more compact. It is something.

〔Effect of the invention〕

Since the present invention is configured as described above, it has the following effects.

In other words, since the spacing between the needle fins is shifted not in the direction adjacent to the needle fins, but in a direction perpendicular to the direction of the needle fins, the spacing is three times the fin diameter, which is desired for the high heat transfer properties of the needle fins. Highly efficient fins having the above spacing can be obtained.

In addition, high-speed production is possible using a rotating roll type device, so it is excellent in mass productivity.

As a result, needle-shaped fins with extremely high thermal efficiency can be mass-produced, and the heat exchanger can be made more compact.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a fin manufacturing apparatus used in the first embodiment of the method of the present invention and the shapes of fins, etc. in each manufacturing process, where (a) is a schematic side view of the fin manufacturing apparatus, and (b) is a schematic side view of the fin manufacturing apparatus. (C) is a partial front view of a material (hoop material 10) in which slit grooves 12, which are the preliminary stage of needle-like fins, are carved, obtained in the process leading to the corresponding white arrow part of the above device. Side view, (d) is a partial side view of corrugation (waveform) of the material obtained in the process leading to the corresponding white arrow of the above device, which is the pre-stage of needle-like fins, (e)
(d) is a sectional view taken along the line E-E, and (f) is the needle-like fin 11 obtained in the process of reaching the corresponding white arrow part of the above device.
(g) is a side view of the needle-like fin 11 obtained in the process of reaching the corresponding white arrow of the above-mentioned device; Figure 2 is the same as above.
Figure 3 shows a grooving roll, a pre-corrugated roll tooth pattern and a fin pitch compression device used in the first and second embodiments. Fig. 4 is a perspective view of the conventional fin, Fig. 5 is a schematic diagram of
The figure is a perspective view of another conventional fin, and FIG. 6 is a schematic side view of a fin manufacturing apparatus used for manufacturing the conventional fin. 1a to 1d... Grooving roll, 28 to 2d... Spare corrugated roll, 3a, 3b.
... Bending extrusion roll, 4... Fin pitch compression device, 5... Coil, 10... Hoop material,
11... Needle fin, 12, 12a... Slit groove, 13... Non-slit portion, 14... Guide hole,
18.15...Fin. Figure 3

Claims (3)

[Claims] (1) A first step of carving a plurality of slit grooves along the longitudinal direction of the supplied hoop material and rounding the gaps between them, and corrugating the hoop material with the slit grooves carved into it, and slit grooves in the sloped part of the hoop material. The second step is to completely separate the slit grooves of the corrugated hoop material, and the needle-like portions formed by separating the slit grooves of the corrugated hoop material are separated at least three times in the longitudinal direction.
A needle-like fin production characterized by comprising a third step of branching into rows, and a fourth step of compressing the longitudinal pitch of the needle-like portions branched into at least three rows to a predetermined pitch dimension. Method. (2) The needle-like fin manufacturing method according to claim (1), wherein in the first step, a plurality of slit grooves are continuously carved in the hoop material along its longitudinal direction. (3) In the first step, non-slit parts are provided in the hoop material with a pitch equal to the length between the peaks and valleys, and guide holes are drilled on both edges of the parts, and between the non-slit parts. Claim (1) characterized in that a plurality of slit grooves are cut along the longitudinal direction of the hoop material, and in the second step, corrugate molding is performed while aligning the peaks and valleys using the guide holes. ) The needle-like fin manufacturing method described in .