JPH049210A - Manufacture of heat transfer tube - Google Patents

Abstract

PURPOSE:To form a heat transfer tube of high performance by cutting and dividing a metallic band plate which grooves or protrusiones are formed on the surface into a width equivalent to the periphery if heat transfer tube and making each of divided metallic band plates into a tube with plural tube making devices. CONSTITUTION:Grooves 34 or protrusiones are formed on the surface of the metallic band plate 21 which is continuously delivered in width equivalent to the periphery of plural heat transfer tubes 22 with a working device 24. The metallic band plate 21 is cut and divided into the width equivalent to the periphery of the heat transfer tube 22 along the longitudinal direction with a cutting device 28. Heat transfer tubes 22a, 22b are manufactured by forming each of divided metallic band plates 21a, 21b tubularly with plural tube making devices 30a, 30b, welding both edges of each of the metallic band plates 21a, 21b and making tubes using high frequency induction coils 33a, 33b. In this way, tube making of good accuracy and reliable welding can be executed.

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention relates to the manufacture of heat exchanger tubes used in heat exchangers that transfer heat between fluids such as refrigerant and air, such as air conditioners, refrigeration equipment, and automobile equipment. It is about the method.

Conventional technology In recent years, heat exchanger tube manufacturing methods have been required to have more complex inner shapes due to faster processing speeds and improved performance. A method of making pipes by welding them has been put into practical use.

Hereinafter, a method for manufacturing the conventional heat exchanger tube described above will be explained with reference to the drawings.

FIG. 2 shows the manufacturing process of a conventional heat exchanger tube. In FIG. 2, reference numeral 1 denotes a metal band plate, which has a width W equivalent to the circumference of the heat exchanger tube 2. 3 is a rolling device for continuously feeding out the metal strip 1, and 4 is a processing device, which is composed of a processing roll 6 having forming grooves 5 on its surface and rolling rolls 7a to 7c pressed against the processing roll 6. Reference numeral 8 denotes a pipe making device, which comprises forming rolls 9a to 9j for forming the metal strip 1 into a pipe, and a high frequency induction coil 10 for welding both edges of the metal strip 1. Moreover, the feeding device 3, the processing device 4, and the tube making device 8 are continuous processes.

In the manufacturing process of the heat exchanger tube configured as described above, after the metal strip 1 is rolled from the feeding device 3, the grooves 11 are formed on the surface through the processing roll 6 and rolling rolls 7a to 7c of the processing device 4. The forming roll 9 of the pipe making device 8
A to 9j are formed into a tubular shape, and both edges are welded by the high frequency induction coil 10 to form the final heat transfer t2.

Problems to be Solved by the Invention However, in the above configuration, in order to perform accurate pipe making and reliable welding, the metal strip 1 sent to the pipe making device 8 is in a flat state without distortion or warping. For this reason, the pattern of the grooves 11 on the surface of the metal strip 1 formed by the processing device 4 can only be processed into a shape that is almost symmetrical in the longitudinal direction with little distortion or warp, and the transmission by pultrusion processing is difficult. There were eight problems: it was impossible to manufacture high-performance heat exchanger tubes because the inner surface shape, such as the spiral grooves found in heat tubes, could not be processed.

In view of the above problems, the present invention has been developed to prevent distortion and warpage of the metal strip after forming the grooves or protrusions, even if the groove or protrusion pattern on the surface of the metal strip used to form the heat exchanger tube is asymmetrical in the longitudinal direction. The present invention provides a manufacturing method for forming heat exchanger tubes with a high-performance inner surface shape such as a spiral groove, by performing tube manufacturing with low precision and reliable welding.

Means for Solving the Problems In order to solve the above problems, the method for manufacturing a heat exchanger tube of the present invention includes forming grooves or protrusions on the surface of a metal strip that is continuously fed out with a width equivalent to a plurality of circumferential widths of the heat exchanger tube. a cutting device that cuts and divides the metal strip along the longitudinal direction into widths equivalent to the circumference of the heat transfer tube; It is constructed by interlocking a plurality of pipe making devices that weld pipes on both edges.

Effect of the present invention With the above configuration, the width of the metal strip in the processing device is set to multiple times the width equivalent to the circumference of the heat exchanger tube so that the pattern of the groove shape to be processed is approximately symmetrical with respect to the longitudinal direction. As a result, the processing equipment can form grooves or protrusions on the surface of the metal strip while suppressing distortion and warping, and the cutting equipment in the next step can longitudinally divide the metal strip into widths equivalent to the circumference of the heat transfer tube. After cutting, accurate pipe making and reliable welding can be performed using the same number of pipe making machines as the number of cut metal strips, making it possible to form high-performance heat transfer tubes with internal shapes such as spiral grooves. I can do it.

EXAMPLE Hereinafter, a method of manufacturing a heat exchanger tube according to an example of the present invention will be described with reference to the drawings.

FIG. 1 shows the manufacturing process of a heat exchanger tube in an embodiment of the present invention. In FIG. 1, 21 is a metal band plate, which has a width 2W that is twice the circumference of the heat exchanger tube 22.

23 is a feeding device that continuously feeds out the metal strip 21, and 24 is a processing device, which includes a processing roll 26 having forming grooves 25 on its surface and rolling rolls 27a to 27 that are pressed against the processing roll 26.
c, and the pattern of the molding grooves 25 is symmetrical. A cutting device 28 includes a cutter 29.

. 30a and 30b are two pipe making devices installed in parallel,
Forming rolls 31a to 31j, 32a to 32j for forming metal strips 21a and 21b, respectively, and metal strips 21a and 2
High frequency induction coils 33a, 33 welding both edges of 1b
It consists of b. In addition, the feeding device 23 and the processing device 24
, the cutting device 28, and the two pipe making devices 30a, 30b are continuous processes.

Through the manufacturing process of the heat exchanger tube configured as described above, the metal strip 21 having a width twice the circumference of the heat exchanger tube 22 is rolled out from the feeding device 23 and then transferred to the processing roll 26 of the processing device 24. and forming grooves 34 on the surface between the rolling rolls 27a to 27c in a symmetrical pattern with respect to the longitudinal direction,
Furthermore, after the metal strips 21a and 21b are divided into two metal strips 21a and 21b having a width W corresponding to the circumference of the heat exchanger tube 22 by the cutter 29 of the cutting device 28, the metal strips 21a and 21b are divided into two pipe-making devices 30a arranged in parallel. 30b forming rolls 31a-31j, 32a~
32j, each formed into a tubular shape, and a high frequency induction coil 3
Both edges are welded by 3a and 33b to form the final heat exchanger tube 2.
2a and 22b, respectively. At this time, the processing device 24 processes the grooves 34 in the metal strip 21 in a symmetrical pattern with respect to the longitudinal direction, thereby suppressing distortion and warping, and the cutting device 28 cuts the metal strip 21 into portions W corresponding to the circumference of the heat exchanger tube 22. Even if the pattern of the grooves 34 is asymmetrical, accurate pipe making and reliable welding can be carried out in the next process, the pipe making apparatuses 30a and 30b, without distortion or warpage.

As described above, according to this embodiment, the processing device 24 forms the grooves 34 on the surface of the metal strip 21 that is continuously fed out at a radius of 2 W, which is twice the rotation of the heat transfer tube 220 times, and the processing device 24 that forms the grooves 34 on the surface of the metal strip 21
1 along the longitudinal direction along the circumferential phase W of the heat transfer tube 22, and the divided metal strip 21a.
, 21b are each formed into a tubular shape to form each metal strip 21a,
A plurality of pipe-making devices 30a1 weld pipes on both edges of 21b.
By moving and preparing the grooves 30b, the processing device 24 can process the grooves 34 on the surface of the metal strip 21 in a symmetrical pattern with respect to the longitudinal direction, thereby making it possible to perform molding with suppressed distortion and warping.
After the metal strip 21 is longitudinally divided into two pieces having a width W corresponding to the circumference of the heat transfer tube 22 using the cutting device 28 in the next step, the tube making devices 30a and 30b perform accurate tube making and reliable welding, respectively. Therefore, the heat exchanger tubes 22a, 22bfe can be formed with a high-performance inner surface shape such as a spiral groove.

Effects of the Invention As described above, the present invention provides a processing device that forms grooves or protrusions on the surface of a metal strip that is continuously drilled over a width equivalent to the circumferential width of a heat transfer tube, and A cutting device that cuts and divides the heat exchanger tube along the lengthwise direction into widths equivalent to the circumference, and a plurality of tube making devices that form the divided metal strips into tube shapes and weld both edges of each metal strip. By configuring these in conjunction with each other, the width of the metal strip in the processing device is set to multiple times the width equivalent to the circumference of the heat exchanger tube so that the groove pattern to be processed is almost symmetrical in the longitudinal direction. As a result, the processing equipment can be used to form grooves or protrusions on the surface of the metal strip while suppressing distortion and warping, and the cutting equipment in the next step can cut the metal strip in the longitudinal direction to a width equivalent to the circumference of the heat exchanger tube. After dividing and cutting, it is possible to perform accurate tube manufacturing and reliable welding in a tube forming process equal to the number of cut metal strips, making it possible to form high-performance heat transfer tubes with internal shapes such as spiral grooves. be able to.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a method for manufacturing a heat exchanger tube according to an embodiment of the present invention, and FIG. 2 is a perspective view showing a conventional method for manufacturing a heat exchanger tube. 21... Metal strip plate, 22... Heat exchanger tube, 24... Processing device, 28... Cutting device, 30... Pipe making device, 34
···groove.

Claims (1)

[Claims] A processing device that forms grooves or protrusions on the surface of a metal strip that is continuously fed out with a width equivalent to a plurality of widths equivalent to the circumference of a heat exchanger tube, and a processing device that cuts the metal strip along the longitudinal direction to a width equivalent to the circumference of the heat exchanger tube. A heat exchanger tube characterized in that it is configured in conjunction with a cutting device that divides the metal strips and a plurality of tube making devices that form each divided metal strip into a tube shape and weld both edges of each metal strip to form the tube. manufacturing method.