JPH0218173B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for forming needle-like corrugated fins, which is intended to further improve heat exchange efficiency in a heat exchanger equipped with needle-like 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. The appearance of this corrugated heat exchanger is shown in Figures 1a and 1b. In the figure, internal partition wall 1a
Connection unions 3 are integrally fixed to the ends of the heat exchanger tubes 1, which are partitioned by It snakes in between. In recent years, a corrugated fin 2 having the shape shown in FIG. 1c has been adopted in order to improve the heat exchange efficiency. As shown in the figure, the corrugated fin 2 has
The needle fins 2b are arranged at a predetermined interval 2 within the thickness of the plate.
The corrugated fins 2 and the heat transfer tubes 1 are integrated at the end portion 2a of the corrugated fins, and the heat medium flowing inside the heat transfer tubes 1 is formed in parallel with the air passing through the corrugated fins 2. to perform heat exchange.

In order to further improve heat exchange efficiency while preventing pressure loss, as shown in FIG. It is desirable to alternately displace them in opposite directions along.

From this point of view, an object of the present invention is to provide a molding apparatus for corrugated needle fins capable of manufacturing the corrugated fins shown in FIGS. 8a and 8b.

By the way, when molding a corrugated fin in which the cross section of the needle-like fin is circular and the fins are bulged in opposite directions alternately along the thickness direction as described above, an example of this is shown in FIGS. 2 and 3. A possible method is to simultaneously form the cross section and bulge the fins as shown in FIG. That is, arc-shaped grooves 14 are provided in the tooth top surfaces 12 and tooth bottom surfaces 13 of the forming rolls 10 and 11, and a ladder-shaped material 15 is fed into the forming rolls 10 and 11. Here, end portions 16 of the material 15 are provided on both end surfaces of the forming rolls 10 and 11.
A disk-shaped presser roll 17 that clamps the material 15 is integrally fixed, so that the square fin portion 1 of the material 15 is formed by the meshing of the teeth of the forming rolls 10 and 11.
8 is inserted into the groove 14 and the tooth bottom surface 13, and the square fin portion 18 is plastically worked into a round bar-shaped needle-like fin 2b. At the same time, due to the meshing phenomenon of the forming rolls 10 and 11, the needle fins 2b are bent alternately in opposite directions along the thickness direction of the material (in the vertical direction in FIG. 3), and are bent into a corrugated shape. As a result, a corrugated fin 2 as shown in FIGS. 8a and 8b is manufactured. In contrast to such a manufacturing method in which shaping the cross section and arranging the fins at the same time, the present invention performs the shaping of the fins and the expansion of the fins independently, and arranges both processes in tandem, thereby improving the forming accuracy. This device is designed to improve performance and speed, and its configuration is such that, in a device that manufactures needle-like fins by inserting a ladder-like material between mutually meshing forming rolls, there is a An array forming roll section is provided in series, and the roll surface of the cross-section forming roll section is provided with a tooth surface for forming the square fin of the material into a circular cross section, while the roll tooth surface of the array forming roll section is provided with the above-mentioned tooth surface. It is characterized in that grooves bent in opposite directions alternately along the plate thickness direction are provided as grooves for biting the fins.

The present invention will be described in detail below based on embodiments shown in the drawings.

As shown in FIG. 6, the needle-like fin forming apparatus according to the present invention comprises a fin cross-section forming section and an array forming section. The cross-section forming section and the array forming section have a common drive mechanism as shown in FIGS. 4a and 4b. First, on the stand 112, a drive rotation shaft 120 connected to a drive source (not shown) is mounted on a bearing 122.
A slider 11 is rotatably attached via a bearing 122 and rotatably supports a rotating shaft 121 parallel to the drive rotating shaft 120 via a bearing 122.
6 is attached to the stand 112 so that it can be raised and lowered. These drive rotation shaft 120 and rotation shaft 12
A pair of forming rolls 113 and 114 formed with mutually meshing tooth profiles are integrally attached to the center of the drive rotating shaft 1 through a set screw 123.
A set screw 1 is attached to the drive gear 115 fixed to the drive gear 20.
A transmission gear 130 is fixed to the rotating shaft 121 via 23 and has the same number of teeth as the driving gear 115, and is in mesh with the rotating shaft 121. Therefore, when the driving rotating shaft 120 rotates, the rotating shaft 121 rotates in synchronization with this. or,
A receiving plate and a slider 116 that are engaged with a plurality of rolling force adjustment bolts 119 installed in the stand 112
A compression coil spring 118 is interposed between the compression coil spring 118 and the forming roll 113 on the slider 116 side by the spring force of the compression coil spring 118.
It is always pressed against the forming roll 114 on the 12 side. In addition, the code in the figure is 117.
is a sliding guide plate that guides the sliding up and down movement of the slider 116.

Next, the forming roll 113 of the cross-section forming roll section
A, 114A has a tooth surface 110 formed on its roll surface as shown in FIG. 5a. That is, the tooth surface 11
0 is a square fin 102b ₀ on a material 102a punched into a ladder shape, and a needle-like fin 102b ₁ with a circular cross section.
The square fin _102b0 is formed by a recess that engages with the forming roll 113.
A, 114A connects the square fin 102b ₀ to the tooth surface 11.
They are arranged with a predetermined gap maintained so as to apply a predetermined rolling force when biting into zero. On the other hand, the forming rolls 113B and 114B of the array forming roll section are provided with tooth surfaces 111 shown in FIG. 5b on their roll surfaces. The forming rolls 113B, 114B
A needle-like fin 102b1 with a circular cross section formed on a strip-shaped material 102a is guided to the tip surface ₁₁₁ of the tooth, and an arc-shaped groove 111 whose width increases toward the tip side is guided.
A is carved along the tooth trace, and the tooth bottom surface 11
1B is also formed in an arc shape.

Here, due to the meshing phenomenon of the forming rolls 113B and 114B, the needle-like fins 102b ₁ form the material 102.
The corrugated fins are bent in opposite directions alternately along the plate thickness direction (vertical direction in Fig. 5) of a, and by bending this into a corrugated shape, a corrugated fin as shown in Fig. 8 can be manufactured. can.

In the present invention, the cross section forming roll section and the array forming roll section are arranged in tandem along the feeding direction of the material 102a as shown in FIG. The forming roll and the forming roll are connected to each other at a gear ratio according to the number of grooves and rotational diameter of both so that the peripheral speed of the roll is the same. Furthermore, these forming roll parts,
There are guide rolls 124 and 1 at the front and rear of the gap, respectively.
26 and a tension roll 125 are provided. The material 102a is sent to the cross-section forming roll section through the guide roll 124, and the square fin _102b0 is connected to the needle-like fin 102 as shown in FIG.
After being formed into _B1 , it is sent to the array forming roll section via a tension roll 125 and a guide roll 126. Here, as shown in FIG. 5b, the needle-like fins _102b1 are alternately bent in opposite directions along the thickness direction to form bulged-shaped fins 102b and sent out.

According to the present invention described above, circularization of the ladder-like fin group and stud guard are performed in consecutive separate steps, that is, the cross-section is formed into a circular shape by the roll section,
By using a stud guard in the array forming roll section, it is not only possible to change the speed in each process, but also reliably prevents the trouble of the needle-shaped fin section falling off from the forming groove 111, especially in the process of the array forming roll section. be done. This is because the fin part is circular in the cross-section forming roll part, so the half-moon forming groove 1
This is because the meshing with No. 11 provides a good fit. Therefore, it has advantages such as high molding speed and good molding accuracy.

[Brief explanation of drawings]

Fig. 1a is a front view showing the general appearance of a corrugated heat exchanger, Fig. 1b is a sectional view taken along the - line in Fig. 1a, Fig. 1c is a partially enlarged sectional view, Figs. The figure is an explanatory diagram showing another manufacturing method, and FIGS. 4a and 4b relate to a forming roll apparatus according to the present invention,
a is a side view, b is a sectional view, FIG. 5 is an explanatory diagram showing the manufacturing process in the present invention, FIG. 6 is an explanatory diagram showing the arrangement of the device according to the present invention, and FIG. 7 is a conventional fin arrangement. The explanatory diagram, FIG. 8a, is a sectional view of a corrugated needle-like fin to which the apparatus of the present invention is applied, and FIG. 8b is a partial external view thereof. In the drawing, 112 is a stand, 113 and 114 are forming rolls, 115 is a drive gear, 116 is a slider, 117 is a guide, 118 is a spring, 119 is a rolling force adjustment bolt, 120 and 121 are rotating shafts, 12
2 is a bearing, 123 is a set screw, and 130 is a transmission gear.

Claims (1)

[Claims] 1. In an apparatus for manufacturing needle-like fins by biting a ladder-like material between forming rolls that mesh with each other, an array forming roll part is connected to the rear of a cross-section forming roll part of the fin, and the cross-section forming roll part The roll surface is provided with a tooth surface for forming the square fins of the material into a circular cross section, while the roll tooth tip surface of the array forming roll portion is provided with grooves for biting the fins, which are arranged alternately along the thickness direction. A needle-like fin forming device characterized by being provided with grooves that bend in opposite directions.