JPH0394940A - Manufacturing device of long-sized heat exchanger tube - Google Patents

Abstract

PURPOSE:To easily obtain the long-sized heat exchanger tube to which embossing is performed by rolling a groove on one face of a heat exchanger tube material, performing the embossing to the face of the groove side, bending the embossed face to the inside and welding a joint part, while forming it cylindrically. CONSTITUTION:From an uncoiler 1, a stock bar 2 is supplied to a groove rolling mill 3, rolled by a groove rolling roll 5 and a groove is formed. Subsequently, it is fed to an embossing machine 6, and as for the stock bar 2 to which embossing is performed by an embossing roll 8 having an embossing face in which ruggedness is formed on the outside peripheral surface, an embossed face 2b is formed by pressure of the outside peripheral surface of the embossing roll 8 on the upper face of the projecting part between its grooves 2a, 2a. Next, tension is given by tension rollers 9, 10, the stock bar is cut along the longitudinal direction by a slitter 11 and wound to a coiler 12. Thereafter, the wound stock bar 2 is formed like a tube by a tube forming device, its joint part is welded by a high frequency welding machine, and a heat exchanger tube having the groove 2a and the embossed face 2b on the inside surface is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for manufacturing a long heat exchanger tube whose inner surface is grooved and embossed.

[Prior Art] Conventionally, when forming uneven embossing or grooves on the inner surface of this type of heat exchanger tube, it is necessary to apply feed in the axial direction of the metal tube by, for example, drawing, and also to form grooves inside the metal tube. This is done by inserting a plug and pressing the die into contact with the plug via a metal tube.

[Problem to be solved by the invention] For this reason, in the processing method of Niki Jubei, even though >l=1 is formed, it is difficult to apply embossing to further improve heat transfer. For this reason, there have been heat exchanger tubes with grooves formed on the inner surface and embossed finish.

The present invention has been made in view of the above two circumstances, and an object of the present invention is to provide a manufacturing apparatus capable of obtaining a long heat exchanger tube having grooves formed on the inner surface and embossed. .

[Means for Solving the Problems] In order to achieve the above object, the present invention provides an if+Y rolling mill that rolls scraps onto one surface of a supplied band-shaped heat exchanger tube material, and an An embossing machine that embosses the groove side surface of the heat pipe material, and the heat transfer pipe material processed by the embossing machine is bent with the embossed surface inwardly and formed into a cylindrical shape while welding the joint part. It is equipped with a pipe forming machine.

Furthermore, it is preferable to include a forming die for forming the cross section of the heat exchanger tube material formed by the pipe forming machine into a predetermined shape.

[Function] In the present invention, grooves are formed in a strip-shaped heat exchanger tube material using a groove rolling mill, and this heat exchanger tube material is fed to an embossing machine to form a long length of heat exchanger tube material with grooves and embossing. Obtain heat tube material. Then, this heat exchanger tube + material is formed into a cylindrical shape using a pipe forming machine to obtain a long heat exchanger tube.

Moreover, when a forming die is provided, a long heat exchanger tube formed with a predetermined cross-sectional shape can be obtained.

[Embodiment 1] An embodiment of the present invention will be described below with reference to FIGS. 1 to 6.

FIG. 1 is a diagram showing an apparatus for manufacturing long heat exchanger tubes, in which a first
Figure (a) is a processing device for grooves and embossing, etc.; Figure 1 (b) is a pipe forming device that processes the material strip into a pipe shape after being processed by the processing device for grooves and embossing; and Figure 1 (c) is shows a device for winding a heat exchanger tube obtained by a pipe forming device into a level wind coil.

In Fig. 1(a), l is an uncoiler, and from this uncoiler 1, a soft or semi-hard copper element formed in a strip shape with a thickness of 0.2 to 0.4 mm {4 strips (heat exchanger tube material) 2 is supplied to the groove rolling mill 3.

The punching machine 3 includes an upper holding roll 4 and a lower groove rolling roll 5 that rolls a groove while pressing the material strip 2 against the holding roll 4. Each of the rolls 4 and 5 has a multi-roll structure in which a plurality of rolls are provided in the width direction of the material strip (direction perpendicular to the paper surface), and the lower groove rolling roll 5 is as shown in FIG. It is formed.

That is, three pairs of protrusions 5a and 5b are formed on the outer circumferential surface of the R4 rolling roll 5, and the protrusions 5a and 5b are protruded from the surface and extend in a straight line. The grooved rolling rolls 5 are arranged so that the direction in which they are formed is symmetrically inclined with respect to the axial direction of the grooved rolling rolls 5. And the paired protrusions 5a,
A partition protrusion 5c that continuously protrudes in the circumferential direction is formed at the boundary between the protrusion 5b and the other pair of protrusions 5a and 5b. The material strip 2 rolled by this groove rolling roll 5 is
As shown in the figure, grooves 2a are formed. This Sei 2a is
The groove in the width direction of the plain strip 2 is formed to be 0.2 to 0.5 mm, and its depth is 0.2 to 0.5 mm. It is formed to have a thickness of 1 to 0.2 mm.

'' The material strip 2, which has been press-throughed by the two-groove rolling mill 3, is sent to the embossing machine 6.

The embossing machine 6 includes an upper holding roll 7 and an embossing roll 8 which presses the material strip 2 against the holding roll 7 and embosses the surface on which the grooves 2a are formed. We are preparing for this.

Each of the rolls 7 and 8 has a multi-roll structure in which a plurality of rolls are provided in the width direction of the material strip (a direction perpendicular to g). The embossing roll 8 is formed into a cylindrical shape, and its outer periphery is marked with the shapes shown in FIGS. 4(a) to 4(c).
) As shown in FIG.
is formed. The embossed surface 8a is formed by electric discharge machining, and the difference in the height direction of the unevenness is 0.1 to 0.2 mm, and the ridges in the direction of distribution on the outer peripheral surface of the unevenness are 0.1 to 0.2 mm. It is formed to have a diameter of 2 to 5 mm.

The material strip 2 embossed with the embossing roll 8 is embossed in the same shape as the embossed surface 8a on the convex portion between the grooves 2a and 2a by pressing the outer peripheral surface of the embossing roll 8. A surface 2b is formed.

Material strip 2 processed with the grooves 2a and embossing 2b
is applied with tension by tension rollers 9 and IO, is cut along the longitudinal direction by a slitter l1, and is wound up by a coiler l2.

The slitter I1 is arranged so as to cut the center of the longitudinally extending groove formed in the material 2 by the protrusions 5c of the grooved rolling roll 5, and the coiler I2 is rotationally driven by an electric motor. By doing this, you can wind up the wood strip 2.

In this way, the material strip 2 once wound around the coiler 12 is shaped into a vibrator shape by a pipe forming apparatus shown in FIG. 1(b).

That is, the material strip 2 wound around the coiler 12 is pulled out through tension rolls l3 and l4 with the surface on which the grooves 2a are formed facing upward, and the roll forming device 15 forms the grooves 2a. The inner surface is formed into a cylindrical shape, and the joint portion is welded by a high-frequency welder 16. As a result, the material strip 2 becomes a heat transfer tube 17 having i7I 2 a and an embossed surface 2b on the inner surface, as shown in FIG. In this embodiment, the outer diameter of the transmission tube 17 is 10 mm. A vibrator forming machine 18 is constructed above the roll forming device 15 and the high frequency welding machine 16.

In the heat exchanger tube 17 formed by the pipe forming machine 18, welding distortion and the like are corrected by a shaping roll 19, and further shaped into a predetermined cross-sectional shape by a forming die 20.

That is, as shown in FIGS. 6(a) and 6(b), the shaped die 20 is used to shape the heat exchanger tube I7 having a circular or oval cross section according to the purpose of the heat exchanger tube 17. The sea urchins are on the rise.

In this way, the heat exchanger tube l formed into a predetermined cross-sectional shape
7 is wound up and stored in a basket 22 while being curved by a pending roll 21.

The heat exchanger tube I7 stored in this way is shown in Fig. 1(c).
As shown in the figure, it was pulled out from the basket 22, curved by another bending roll 23, and formed into a leher wine 1 coil 25 by a leher wind coiler 24, and bright annealing was performed in this state. After that, he was promoted.

The heat transfer tube 17 formed as described above is used, for example, with an oval cross section, in a fin coil heat exchanger shown in FIG. 7, a surventine heat exchanger shown in FIG. Be it. However, in these figures, the fin indicated by the reference numeral 3l is a fin for heat radiation.

In the heat exchanger tube manufacturing apparatus configured as above,
After forming the groove 2a in the strip-shaped material strip 2, an embossment 2b is continuously processed on the upper surface of the convex portion between the grooves 2a, thereby forming >7'f 2 a and an embossment 2b. A long material strip 2 is obtained. Then, the vibrating molding machine 18 continuously molds the tube 8 pipe 17 from the material strip 2.

Therefore, in the heat exchanger tube manufacturing apparatus configured as described in section 2, it is possible to manufacture a long heat exchanger tube 17 in which the grooves 2a and the embossed surfaces 2b are formed. Moreover,
Since the grooves 23 and the embossing holes 21) can be formed continuously, in combination with pipe forming by the pipe forming machine 18, the heat transfer tube 17 can be shaped extremely efficiently. In order to form lII+￥2a on the material strip 2 supplied in the form of {}, it is possible to create a spiral i with a large number of strips, which cannot be obtained by inserting a plug and rolling.
ff 2 a can be truncated. Furthermore, a pair of protrusions 5a, 5b are formed on the groove rolling roller 5, and these protrusions 5a, 5b extend symmetrically with respect to the axis of the groove rolling roller 5. If there is a problem that the material strip 2 is pushed in a direction different from the feeding direction when the poem extends in the same direction, it is possible to prevent this problem. Furthermore, since heat exchanger tubes with irregular cross sections can be easily manufactured, heat exchanger tubes with a cross-sectional shape that allows the inner surface of the tube to be used as a countermeasure can be designed in accordance with the heat exchanger 23 and the like.

In addition, in the above embodiment, iM2a 5 is attached to the cable strip 2.
The process of forming the embossed material 2b, the process of forming the heat exchanger tube 17 from the material strip 2, and the process of forming the heat exchanger tube 17 into the level wind coil 25 are arranged separately. It goes without saying that the apparatus may be arranged so that the process from supplying the material strip 2 to forming the level wind coil 25 is performed continuously.

[Effect of the invention] As explained above, according to the present invention, the belt-shaped heat exchanger tube {
Since it is possible to continuously apply embossing to the surface on which the grooves are rolled while rolling the grooves, it is possible to obtain a long belt-shaped heat exchanger tube material with grooves and embossing. can. By forming this heat exchanger tube material into a cylindrical shape and welding it, it is possible to obtain a long heat exchanger tube with grooves and embossing on the inner surface, which is a remarkable effect.

Further, when a forming die is provided, a remarkable effect is achieved in that the heat exchanger tube can be formed into a predetermined cross-sectional shape.

[Brief explanation of drawings]

1 to 6 are diagrams showing an embodiment of the present invention, in which FIG. 1(a) is a diagram showing the structure of a rolling/embossing device, and FIG. 1(b) is a diagram showing a pipe forming device. A diagram showing the configuration of the device, FIG. 1(c) is a diagram showing the device for shaping the level wind coil, FIG. 2 is a plan view showing the groove rolling roll, and FIG. 3 is a diagram showing the groove rolling machine. FIG. 4 is a sectional view of the surface of the embossing roll, FIG. 5 is an explanatory diagram showing how the material strip is formed into a cylindrical shape, and FIG. Figure 6 shows an example of a cross section of a heat exchanger tube formed by
Figure (b) is a diagram showing an example of the cross section of a heat exchanger tube formed with another forming die, Figures 7 and 8 are diagrams showing examples of how the heat exchanger tube is used, and Figure 7 is a diagram showing a fin coil heat exchanger. FIG. 8 is a perspective view showing a serpentine heat exchanger. 2...Material strip (heat transfer tube material), 2a-...Groove, 2]]... Emboss, 3...214 rolling machine, 6... Embossing machine, I7・Heat transfer tube, l8...pipe forming machine, 20...forming die. Figure 2

Claims (2)

[Claims] (1) a groove rolling machine that rolls grooves on one side of the supplied band-shaped heat exchanger tube material; an embossing machine that embosses the groove side surface of the heat exchanger tube material supplied from the groove rolling machine; A pipe forming machine that bends the embossed surface of the heat exchanger tube material processed by the embossing machine inward to form a cylindrical shape while welding the joint portion. Manufacturing equipment. (2) a groove rolling machine that rolls grooves on one side of the supplied band-shaped heat exchanger tube material, and an embossing machine that embosses the groove side surface of the heat exchanger tube material that is supplied from the groove rolling machine; A pipe forming machine that welds the joint part while bending the embossed surface of the heat exchanger tube material processed inward to form a cylinder, and 1. An apparatus for manufacturing a long heat exchanger tube, comprising: a forming die for forming a cross section into a predetermined shape.