JPH0150498B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a corrugated needle fin forming apparatus designed to further improve heat exchange efficiency in a heat exchanger equipped with needle corrugated fins.

In compact heat exchangers such as car air conditioners and radiators, those having a structure in which corrugated fins are interposed between meandering heat transfer tubes are most commonly used. As shown in FIG. 1, which shows the appearance of this corrugated heat exchanger, a connection union 2 is integrally fixed to the end of a heat exchanger tube 1 whose interior is partitioned by a partition wall (not shown). Heat exchanger tube 1
are alternately bent 180 degrees at bend portions (bent pipe portions) 3, and meander so as to sandwich the corrugated fins 4. In recent years, with the aim of improving heat exchange efficiency, corrugated fins 4 having the shape shown in Fig. 2 have come to be adopted. As shown in Figure 3,
The corrugated fins 4 and the heat transfer tubes 1 are integrated at the end portions 5 of the corrugated fins 4, so that the heat medium flowing inside the heat transfer tubes 1 exchanges heat with the air passing through the corrugated fins 4. For this reason, the needle fins 7 are removed from the tops 6 of the corrugated fins 4 in order to prevent pressure loss.

By the way, when aiming to further reduce pressure loss and improve heat exchange efficiency, the fourth
As shown in the figure, it is desirable that the needle-like fins 7 have a circular cross-sectional shape and are alternately displaced in opposite directions along the thickness direction.

From this point of view, an object of the present invention is to provide a needle-like corrugate fin molding apparatus capable of manufacturing corrugate fins as shown in FIG. 4.

The configuration of the needle-like fin forming apparatus for corrugates of the present invention that achieves this objective is that a strip-shaped material having rectangular openings formed at regular intervals along the width direction of the board is fed into the material, and the material is rotated synchronously with each other. A needle-like fin forming apparatus for corrugates, comprising a pair of forming rolls that plastically deform rectangular bar-shaped square fin parts formed in the material by the adjacent openings into round rod-like needle-like fins, respectively. ,
Teeth profiles that engage with each other are formed on the outer periphery of the forming roll, and arcuate grooves are carved along the tooth traces, in which the square fin portions are guided and the width increases toward the tips. The tooth bottom surfaces are each formed into an arc shape, and the needle-like fins, which are pressed between the tooth bottom surfaces and the grooves and become round bar-shaped, are alternately bent in opposite directions along the thickness direction of the material. This is a characteristic feature.

Hereinafter, an embodiment of the corrugated needle fin forming apparatus according to the present invention will be described in detail with reference to FIGS. 5 to 8. Fig. 5a showing the cross-sectional structure of this example and Fig. 5b showing the left side shape thereof
As shown in the figure, a drive rotation shaft 12 connected to a drive source (not shown) is rotatably mounted on the stand 11 via a bearing 13, and a rotation shaft 14 parallel to the drive rotation shaft 12 is mounted on a bearing. A slider 16 rotatably supported via a slider 15 is attached to the stand 11 so as to be movable up and down. A pair of forming rolls 17 are formed in the center of the driving rotation shaft 12 and the rotation shaft 14 and have tooth profiles that engage with each other.
is integrally attached to the drive gear 19, which is fixed to the drive rotation shaft 12 via the set screw 18, and which is fixed to the rotation shaft 14 via the set screw 20 and has the same number of teeth as the drive gear 19. The transmission gear 21 is meshed with each other, so that when the drive rotation shaft 12 rotates, the rotation shaft 14 rotates in synchronization with this. A compression coil spring 24 is interposed between the slider 16 and a receiving plate 23 that is engaged with a plurality of downward force adjusting bolts 22 installed in the stand 11, and the spring force of this compression coil spring 24 Slider 16
The forming roll 17 on the side is always pressed against the forming roll 17 on the stand 11 side. Note that the reference numeral 25 in the figure is a sliding guide plate that guides the sliding movement of the slider 16 up and down. As shown in FIG. 6, which is an enlarged view of the meshing portion of the forming roll 17, and FIG. 7, which is an enlarged view of the tip of the tooth profile of this forming roll, the tooth tip surface 26 of the forming roll 17 is provided with a strip-shaped material 27. A rectangular rod-shaped square fin portion 28 formed in the tooth is guided, and an arc-shaped groove 29 whose width increases toward the tip end is carved along the tooth trace, and the tooth bottom surface 30 is also formed in an arc shape. has been done. In this embodiment, as shown in FIG. 8, which shows a cross section taken in the direction of the - arrow in FIG. Therefore, the square fin portion 28 is sandwiched between the groove 29 and the tooth bottom surface 30 by the engagement of the teeth of the forming roll 17, and the square fin portion 28 is inserted into the round bar-shaped needle fin 33. Plastically processed. Here, due to the meshing phenomenon of the forming rolls 17, the needle-like fins 33 are bent alternately in opposite directions along the thickness direction of the material 27 (vertical direction in FIG. 8), and are bent into a corrugated shape. By doing so, a corrugated fin 4 as shown in FIG. 4 can be manufactured. in this case,
Even if there is some phase shift between the square fin portion 28 and the tooth profile of the forming roll 17, the square fin portion is automatically guided into the groove 26 because the groove 26 has a tapered opening shape. However, this is also related to the fact that the upper forming roll 17 can be displaced in a direction away from the lower forming roll 17 against the spring force of the compression coil spring 24.

As described above, according to the needle-like fin forming apparatus for corrugates of the present invention, tooth profiles that engage with each other are formed on a pair of forming rolls, grooves that spread in an arc shape are carved on the tooth tips of these tooth profiles, and grooves are carved on the tooth bottom surfaces. The square fins of the material are also formed into an arc shape, and the square fins of the material are inserted between the tooth bottom surface and the grooves to form a round bar-like needle-like fin and are bent in the thickness direction of the material. It has become possible to manufacture corrugated fins with high exchange efficiency and low pressure loss.

[Brief explanation of drawings]

Fig. 1 is a front view showing the general appearance of a corrugated heat exchanger, Fig. 2 is a perspective view showing the appearance of a part of the corrugated fin, and Fig. 3 is a part of the cross section taken in the direction of the - arrow in Fig. 1. An enlarged view, FIG. 4 is a conceptual diagram similar to FIG. 3 showing the structure of the corrugated fin according to the present invention,
FIG. 5a is a cross-sectional view showing the structure of one embodiment of the corrugated needle fin forming apparatus according to the present invention, FIG. 5b is a left side view thereof, FIG. Figure 7 is an enlarged outline cross-sectional view of the tip of the tooth profile, and Figure 8 is a cross-sectional view taken along the - arrow in Figure 6.The symbols in the figure are: 11 is the stand, 12 is the drive rotation shaft, and 14 is the rotation. Shaft, 16 slider, 17 forming roll, 19
is a drive gear, 21 is a transmission gear, 22 is a rolling force adjustment bolt, 23 is a receiving plate, 24 is a compression coil spring,
26 is the tooth tip, 27 is the material, 28 is the corner fin,
29 is the groove, 30 is the tooth bottom surface, 31 is the end of the material, 3
2 is a presser roll, and 33 is a needle-like fin.

Claims (1)

[Claims] 1. A material in the form of a strip having rectangular openings formed at regular intervals along the width direction of the board is fed, and the rectangular bar-shaped material formed in the material by the adjacent openings rotates in synchronization with each other. In a corrugate needle-like fin forming apparatus equipped with a pair of forming rolls for plastically deforming square fins into round rod-like needle-like fins, tooth profiles that engage with each other are formed on the outer periphery of the forming rolls, and the tips of these teeth are An arc-shaped groove in which the square fin portion is guided and the width increases toward the tip end is carved along the tooth trace, and the tooth bottom surface is formed in an arc shape, and the tooth bottom surface and the groove are formed in a circular shape. 1. An apparatus for forming needle-like fins for corrugates, characterized in that needle-like fins that have been clamped and pressed into a round bar shape are alternately bent in opposite directions along the thickness direction of the material.