JPS59104231A - Forming device for needle fin for corrugation - Google Patents

Abstract

PURPOSE:To enable production of fins which decrease the pressure drop and improve the thermal efficiency by forming the tooth crest and bottom land of the tooth profiles of a pair of forming rolls which are meshed with each other into circular-arcuate shape, and forming and crooking a blank material at the space between the same. CONSTITUTION:Profiles which are meshed with each other are formed on the outside circumferences of forming rolls 17, and the circular-arcuate grooves 29 are inscribed respectively along the tooth trace on the tooth crests 26 thereof and the bottom lands 30 thereof are also formed into a circular-arcuate shape. A square fin part 28 conducted between the land 30 and the groove 29 is grasped under pressure and is formed into a round bar shape. A needle fin 33 formed into a round bar shape is crooked alternately reverse along the thickness direction of a blank material 27. Said material 27 is a belt-like plate formed with rectangular openings along the transverse direction at a specified interval and is formed with square fins 28 having a rectangular bar shape. The fins which decrease the pressure drop and improve the thermal efficiency are thus produced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming old corrugated fins, which is intended to further improve heat exchange efficiency in a heat exchanger equipped with needle-shaped 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 Figure 1, which shows the appearance of this corrugated heat exchanger,
A connecting lambda nion 2 is integrally fixed to the end of the heat exchanger tube 1, the inside of which is partitioned by a partition wall (not shown), and the heat exchanger tube 1 is rotated 180 degrees alternately at the bend portion (curved tube portion) 3. It is bent and meandering so as to sandwich the corrugated fins 4. In recent years, with the aim of improving heat exchange efficiency, corrugated fins 4 having a shape as shown in Fig. 2 have been adopted, and a part of the cross section taken along arrow I-1 in Fig. 1 is shown below. As shown in FIG. 3, corrugated fins 4 and heat exchanger tubes 1
are integrated at the corrugated fin end portions 5, so that the heat medium flowing in the heat transfer tube 1 exchanges heat with the air passing through the corrugated fins 4. Therefore, from the viewpoint of preventing pressure loss, the top part 6 of the corrugated fin 4 is
In this case, the needle-like fins 7 have been removed.

By the way, in order to further increase the pressure loss IPA A and improve the heat exchange efficiency, as shown in FIG. 4, which is similar to FIG. It is desirable to alternately displace them in opposite directions along the thickness direction.

From this point of view, an object of the present invention is to provide a corrugate needle fin forming apparatus capable of producing corrugate fins as shown in FIG. The structure of the fin forming device is that strip-shaped materials with rectangular openings formed at regular intervals along the width direction of the plate are fed and rotated in synchronization with each other. In a corrugate needle-like fin forming apparatus comprising rolls each forming a rectangular bar-shaped corner fin portion formed in the material by the opening, forming solid bodies that engage with each other on the outer periphery of the forming roll 1V, In these groove surfaces, arc-shaped grooves in which the square fin portions are guided and the width of the grooves widens on the tip side are carved along the ω line, and the bottom surfaces of the teeth are each formed in an arc shape. It is characterized in that needle-like fins that are squeezed between the fins and the grooves to form a round bar shape are alternately bent in opposite directions along the thickness direction of the material.

Hereinafter, an embodiment of the corrugated needle fin forming apparatus according to the present invention will be described in detail with reference to FIGS. 51 to 8. As shown in Figure 5 (aJ and Figure 5 (b) representing the left side shape of this example)
A drive rotation shaft 12 connected to a sliding source (not shown) is rotatably mounted on the stand 11 via a bearing 13, and a rotation shaft 14 parallel to this drive rotation @12 is connected via a bearing 15f. A rotatably supported slider 16 is attached to the stand 11 so as to be movable up and down. A pair of forming rolls 17 having tooth profiles that engage with each other are integrally attached to the center portions of the drive rotation shaft 12 and the rotation shaft 14, and a set screw 18 is valved to control the drive rotation @12.
The four driving wheels 19 are fixed to the rotating shaft 14 through set screws 20 (i), and transmission teeth m21 having the same number of bacteria as the 01 wheel 19 are engaged with the four driving wheels 19. When the rotating shaft 12 rotates, it rotates in synchronization with this i1!l111
4 rotates. The holder that holds several bales on the lowering blade adjustment port 22 installed on the stand 11 is a temporary 23 and a slider 16.
A compression coil spring 24 is interposed between 2 and 2, and the spring force of this pressure path coil spring 24 constantly presses the forming roll 17 on the stay 16 side against the forming roll 17 on the stand 1 side. It is in a state of being 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. Enlarging the meshing part of the forming roll 17
The tooth tip tJk of the tooth profile of this forming roll and the enlarged No. 7
As shown in the figure, on the front surface 26 of the forming roll 170, a rectangular rod-shaped T-angle fin portion 28 is guided, and the tip 1tll is a circle with a widened duck shape. An arcuate groove 29 is carved along the protrusion, and the tooth bottom surface 30 is also formed in an arcuate shape. In addition, in this embodiment, as shown in FIG. 8, which shows the cross section from 1 to 3 in FIG. The disc-shaped presser roll 32 is integrated.
Therefore, the square fin portion 28 is sandwiched between the groove 29 and the tooth bottom surface 30 due to the spacing of the bridge shape of the forming roll 17. Ru. Here, the meshed R-shaped fins 33 of the forming roll 17 are bent alternately in the opposite direction along the thickness direction of the material 27 (in the vertical direction in Fig. 468), and this is formed into a corrugated shape. In this case, even if there is some phase shift tL between the square fin portion 28 and the eye shape of the forming roll 17,
Since fj26 has a tapered opening,
The square fin portion is automatically guided into the core 26, but this is caused by the upper forming roll 17 being displaced in the direction away from the lower forming roll 17 against the spring force of the compression coil spring 24. This is also related.

As described above, according to the corrugated circular side fin forming apparatus of the present invention, a pair of forming rolls are formed with mouth shapes that engage with each other, and grooves extending in an arc shape are carved on the mouth surfaces of these mouth shapes, and the bottom surface is also circular. It is formed into an arc shape, and the square fin part of the E wood is inserted between the tooth bottom surface and the spring to form a round culm-like needle-like fin and to bend it in the thickness direction of the material. It has become possible to manufacture corrugated fins f with high heat exchange efficiency and low pressure loss.

[Brief explanation of the drawing]

Figure 1 is a front view showing the general appearance of the corrugated heat exchanger, Figure 2 is a perspective view showing the appearance of a part of the corrugated fin, and Figure 3 is a diagram showing the structure of the corrugated fin in Figure 1. 3 is a conceptual diagram similar to that of FIG. 3, FIG. 5(a) is a cross-sectional view showing an R5 structure in which a part of the corrugated needle fin forming apparatus according to the present invention is an example, and FIG. 5(b) is a left side view thereof. Figure 6 is a work concept diagram showing the processing principle, Figure 7 is the tooth tip surface of the mouth shape,
The enlarged outline cross-sectional view, FIG. 8, is a cross-sectional view taken along the arrow ■-■ in FIG. 17 is a forming roll, 19 is a drive gear, 21 is a transmission date wheel, 22 is a reduction blade adjustment bolt, 23 is a plate for a receiver, 24 is a compression coil spring, 26 is a tooth tip surface, 27 is a material, 28 is a A corner fin portion, 29 is a groove, 30 is a tooth bottom surface, 31 is an end of the material, 32 is a presser roll, and 33 is a needle fin. Patent Applicant Mitsubishi Heavy Industries Izumi Co., Ltd. Patent Attorney Mitsubishi Heavy Industries, Ltd. Patent Attorney (1 person)

Claims (1)

[Claims] A strip-shaped material is fed into which rectangular openings are formed at regular intervals along the direction of the plate, and rectangular bar-shaped corners are formed in the material by the adjacent openings that rotate synchronously with each other. In a corrugate needle-like fin forming apparatus equipped with a pair of forming rolls for plastically deforming fin portions into round rod-shaped needle-like fins, tooth profiles that engage with each other are formed on the outer periphery of the forming rolls, and the An arcuate groove in which the square fin portion is guided and the width of the tip is widened is carved along the tooth trace, and the bottom-resistant surface is formed in an arcuate shape, and pressure is applied between the tooth bottom surface and the groove. A needle-like fin forming apparatus for a corrugate, characterized in that needle-like fins that have been bent into a round bar shape are alternately bent in opposite directions along the thickness direction of the material.