JPH04197529A - Method and device for manufacturing metallic spiral tube - Google Patents

Abstract

PURPOSE:To manufacture the spiral tube without flattening even if it is a thin wall by freezing the metallic straight tube filled with liquid, clamping the turning part between the winding roller and the bending roller and winding it with the inclined guide part of the winding roller while bending by driving the winding roller. CONSTITUTION:The liquid being able to freeze is filled in the metallic straight tube 7, both ends are sealed and this is frozen in the freezer 6. Next, the part of the metallic straight tube 7 to be wound is clamped between the winding roller 3 and the bending rollers 5, 50, 51, while bending the metallic straight tube 7 in resisting to the tube flattening force with the inner frozen body with the winding roller 3 and the bending rollers 5, 50, 51 by rotating to drive, at least, the winding roller 3, the winding part 80 is deviated with respect to the beginning end part 70 with the inclined guide part 31 of the winding roller 3 and wound round the winding roller 3 in the spiral state.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method and apparatus for manufacturing a metal spiral tube that can easily and accurately manufacture A-wound tubes that can be used in heat exchangers and the like.

(Prior art) In a heat exchanger, one of a heat exchange fluid and a fluid to be heat exchanged is passed through a built-in metal spirally wound tube, and the other is passed through the outside of the metal spirally wound tube. A method of exchanging heat with a fluid is well known, and various methods have been proposed for manufacturing such spirally wound pipes (
For example, Patent No. 140878, Japanese Patent Publication No. 3E11896
Publication No. 5, Japanese Patent Publication No. 110160/1983, Japanese Patent Application Publication No. 1983
(See Publication No. 3-129).

However, when a spirally wound tube is installed inside a heat exchanger as described above, there is a problem in that the heat exchanger body becomes thick and the installation space for the exchanger is likely to be restricted.

In response to this problem, it has recently been proposed to use a spiral tube instead of the spirally wound tube to make the heat exchanger thinner.

(Problems to be Solved by the Invention) However, although there are various methods for manufacturing spirally wound tubes as described above, there is no suitable method for manufacturing spirally wound tubes.
For example, if a straight metal pipe is further wound around the outside of the wound part using it as a guide, not only will it not form an accurate spiral, but it will also become tightly wound due to elastic deformation and springback of the pipe. The problem was that it was difficult.

In addition, when installing inside a thin heat exchanger, it is desirable to extend both ends of the spiral tube parallel to the spiral surface, and in that case, the problem is how to start winding the spiral start end of the metal straight tube. becomes.

On the other hand, the inventor of the present invention relates to a method for manufacturing a spirally wound pipe, in which a metal straight pipe is filled with liquid and frozen, and a liquid freezing body inside the pipe maintains the outer peripheral shape of the straight pipe while counteracting the pipe flattening force. We have proposed a method (Japanese Patent Application Laid-Open No. 2-46926).
Using this method, flattening of the pipe when winding a straight pipe in a spiral can be prevented, but the above-mentioned method of winding the beginning of the spiral and the winding work of the continuous part are difficult. Problems still remain.

In view of the above, an object of the present invention is to provide a method for manufacturing a metal spiral tube that can easily and accurately manufacture a spiral tube that can be used in a heat exchanger or the like.

(Means for Solving the Problems) Therefore, the method for manufacturing a metal spiral tube according to the present invention is as follows: ``When manufacturing a spiral tube using a metal straight tube, The ends of the straight metal pipe are closed, the pipe is frozen in a freezer, and the part to be wound that is continuous to the starting end of the straight metal pipe is held between a winding roller and a bending roller, and at least the winding roller is rotated. The winding roller and the bending roller bend the metal straight pipe while opposing the tube flattening force at the time of bending by the internal liquid freezing body, while bending the metal straight pipe by the winding roller and the bending roller. The guide section displaces the first winding portion that is continuous with the starting end with respect to the starting end, and while further rotationally driving at least the take-up roller, the take-up roller is moved within the winding plane and in the metal straight line. The metal straight pipe is moved back in a direction substantially perpendicular to the pipe, and the metal straight pipe is wound spirally around the winding roller while positioning the metal straight pipe at its starting end within the winding plane.

It is also desirable to provide the winding roller with a positioning member for more precise winding outside the first winding of the spiral tube. That is, when winding a metal straight pipe into a spiral shape on a winding roller, a positioning member is attached to the winding roller, and the positioning member is sandwiched between the positioning member and the starting end of the metal straight pipe. Preferably, the rolled portion of the tube is positioned within the winding plane.

In addition, heat exchanger BUs in which spiral tubes are used - so 5
It is necessary to use a metal straight pipe with a diameter of about 1.5 m, or it may overflow.In such a case, if the long straight pipe that has been frozen is exposed to the high temperature atmosphere of the factory and rolled seven times, the liquid freeze There is a concern that the tube may become flat due to melting, so it is necessary to take measures to prevent this. That is, in the present invention, it is desirable that the metal straight pipe is gradually pulled out from the freezer and wound around the winding roller.

In addition, in carrying out the manufacturing method of the present invention, "a drawer port is provided adjacent to the workbench for pulling out the metal straight pipe to be spirally wound from one end side, and the metal straight pipe is a freezer that freezes the liquid filled in the pipe; and a freezer that stands up on the workbench and is slidably provided in a direction substantially perpendicular to the direction in which the metal straight pipe is pulled out, and that has a freezer on the outer peripheral surface thereof; a winding roller for winding the metal straight pipe in a spiral shape; a bending roller that bends the metal straight pipe together with a take-up roller and causes the metal straight pipe to be wound around the take-up roller; a rotation drive mechanism that rotates at least the take-up roller; It is preferable to use a "metal spiral pipe manufacturing apparatus" which is equipped with a retraction drive mechanism that retracts the metal straight pipe in a direction substantially perpendicular to the drawing direction of the metal straight pipe according to the winding operation.

In addition, in order to accurately form a straight metal pipe into a spiral shape, it is necessary to use two bending rollers: a small diameter roller that bends the metal straight pipe into a small diameter spiral inner part, and a large diameter roller that bends the metal straight pipe into a large diameter spiral outer part. It is preferable that the roller be made up of a small diameter roller and a large diameter roller that can be selected.

(Function) In the present invention, since the metal straight pipe is bent while counteracting the pipe flattening force at the time of bending by the internal liquid freezing material, the straight outer peripheral shape of the spiral pipe is maintained. It will not become flattened.

In addition, since the winding roller is provided with an inclined guide part, the first winding part of the metal straight pipe is naturally displaced from the starting end by the inclined guide part, and as a result, the winding work is performed. becomes very easy.

In addition, since the straight metal pipe is wound in a spiral while positioning the straight metal pipe within the winding plane at its starting end, it can be wound in an accurate spiral. . Moreover, at that time, if a positioning member is attached to the winding roller and the positioning member is sandwiched between the starting end of the metal straight pipe and the winding part of the metal straight pipe is positioned, the desired spiral shape can be achieved with even greater precision. A tube is manufactured.

(Example) Hereinafter, the present invention will be described in detail based on specific examples shown in the drawings.

1 to 6 show an apparatus for manufacturing a metal spiral tube according to an embodiment of the present invention. In the figure, a table (workbench) is placed on the floor, a table surface 1 of the table is provided so as to be slidable in the horizontal direction, and a drive motor 20 and a drive motor 21 are mounted on the table surface 1. A rotation/backward drive mechanism 2 is provided, and a winding roller 3 is supported in an upright manner above the gear wheel 21. In this way, the winding roller 3 stands up on the table and is connected to a metal straight pipe 7. The rotation and retraction drive mechanism 2 rotates the winding roller 3 and moves it backward in accordance with the winding operation.

A circular support plate 30 and an inclined guide 31 are formed at the lower end of the winding roller 3, and the inclined guide 31 is connected to a metal straight pipe 7.
The first winding portion 71 of the winding 71 is displaced relative to the starting end 70 thereof. Further, a cylindrical positioning member 4 is removably provided at the upper end of the winding roller 3, and the positioning member 4 has a spiral housing groove 40 formed therein, and has a radius on its outer peripheral surface. A plurality of positioning rods 41 extending in the direction are fixed by welding or the like, and the positioning rods 41 sandwich the winding portion 80 of the metal straight pipe 7 between them and the starting end 70 of the metal straight pipe 7, and roll it into the winding plane. It is designed for positioning.

Furthermore, a winding roller 3 is provided on the side of the winding roller 3.
At the same time, a bending roller 5 for bending the metal straight pipe 7 is provided, and the bending roller 5 has a small diameter roller 50 for bending the metal straight pipe 7 into a small diameter spiral inner part, and a large diameter spiral outer part. The small diameter roller 50 is supported by a swingable bracket 52, and the large diameter roller 51 is supported by a fixed bracket 53. You can choose.

Also, on the floor surface, there is a freezer 6 adjacent to the table.
The freezer 6 is provided with an opening/closing door 6 on the front end surface and the top surface.
0.61 is provided, and the opening/closing door 60 on the front end face is formed with an outlet 62 for pulling out the metal straight pipe 7 to be spirally wound from one end side.

Further, FIG. 7 shows a metal spiral tube 8 manufactured by nature, and FIG. 8 shows a straight tube 7 in the middle of manufacture.

Next, the manufacturing method will be explained.

When manufacturing the metal spiral tube 8, first, the day before work, the 5 m long metal straight tube 7 is filled with a freezeable liquid, such as water, and both ends are closed with rubber plugs, etc., and then the front door 60 is closed. Open it, put it in the freezer 6, and freeze it, for example, during the night.

When the inside of the metal straight pipe 7 is filled with the frozen liquid, the bracket 52 is swung to center the small-diameter bending roller 50, and the handle 23 of the rotation/backward drive mechanism 2 is operated to remove the winding roller. 3 to the front position and the freezer 6
Open the upper door 61, pull out the starting end of the internal straight metal pipe 7 from the outlet 62 of the front door 60, and pull it out from the roller 3.5.
0 and activate the drive mechanism 2 (see Figures 1 and 2).

Then, the portion of the metal straight pipe 7 that is continuous with the starting end 70 is bent by the bending roller 50 and the winding roller 3 and wound around the winding roller 3 while being prevented from flattening by the internal liquid freezing material. The bent portion 80 is displaced upward with respect to the starting end 70 by the inclined guide 31 of the take-up reroller 3 and intersects with the starting end 70 (see FIG. 8).

When the first bending is completed, the bracket 52 is returned to its original position, the small diameter bending roller 50 is unscrewed, the handle 23 is operated again to advance the winding roller 3, and this time the large diameter winding roller 3 is moved forward. 51, the positioning member 4 is attached to the upper end of the winding roller 3 as shown in FIG. Further, as shown in FIG. 5, a rubber member 9 of a predetermined length is attached to the outside of the straight pipe 7, and the drive mechanism 2 is operated in this state.

Then, the metal straight pipe 7 is gradually pulled out from the freezer 6 and is further bent by the winding roller 3 and the large diameter bending roller 51, and the winding roller 3 is in the winding plane and the metal straight pipe 7 is further bent by the winding roller 3 and the large diameter bending roller 51. As a result of being retracted in a direction substantially perpendicular to 7, the bent portion 80 is wound around the winding roller 3 in a spiral shape while being positioned at a predetermined interval by the rubber member 9.

At that time, as a result of the winding portion 80 being held between the starting end 70 of the metal straight pipe 7 and the positioning rod 41 of the positioning member 4, the winding portion 80 is positioned within the winding plane,
Further, the tube is prevented from flattening by the liquid freezing material inside, and thus a metal spiral tube that maintains the outer peripheral shape of the straight tube 7 and has a predetermined spiral shape is manufactured.

After that, the manufactured spiral tube is removed from the manufacturing equipment, the rear end 81 is bent parallel to the starting end 70, and the rubber stopper is removed and left to stand. A desired product (see FIG. 7) 8 is obtained which can be used in an exchanger.

In the method for manufacturing the metal spiral tube of this embodiment as described above,
Since the winding roller 3 is provided with the inclined guide 31, the first winding portion 80 can be naturally crossed with the starting end 70 by the inclined guide 31 while bending the metal straight pipe 7. As a result, folding work can be done very easily.

Further, in the method for manufacturing a metal spiral tube of this embodiment, when the metal straight tube 7 is further wound, the winding portion 80 is positioned within the winding plane by the starting end 7 and the positioning rod 41. Therefore, it can be manufactured in an accurate spiral shape.

Furthermore, in the manufacturing method of the metal spiral tube of this embodiment, since the metal straight tube 7 is bent while counteracting the tube flattening force at the time of bending by the liquid frozen substance inside the tube, the spiral tube 8 is bent. The straight pipe outer shape can be maintained without flattening.
Moreover, after manufacturing, if you remove the rubber stopper and leave it, the filling material inside will melt and flow out, making post-processing very easy.

(Effects of the Invention) As described above, according to the method for manufacturing a metal spiral tube and the apparatus for manufacturing the same according to the present invention, a straight metal tube is filled with a freezeable liquid, both ends of which are closed, and the tube is placed in a freezer. The part to be wound continuously from the starting end of the metal straight pipe is held between a winding roller and a bending roller, and the metal straight pipe is frozen by its internal liquid by the winding coke and bending roller. While bending the tube while opposing the tube flattening force at the time of bending by the frozen body, the first winding portion continuous to the starting end is displaced with respect to the starting end by the inclined guide portion of the winding roller,
Further, the take-up roller is moved backward within the wind-up plane, and the metal straight pipe is held at its starting end with a positioning member as necessary to position it within the wind-up plane, and the wind-up roller swirls the tube. Since the metal tube is wound into a shape, even if the straight metal tube is relatively thin, it can be bent into a spiral shape without flattening it, and the metal spiral tube can be easily and accurately manufactured.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view from the front side of a metal spiral tube manufacturing apparatus according to an embodiment of the present invention, FIG. 2 is a schematic perspective view from the rear of the above-mentioned apparatus, and FIGS. FIGS. 5 and 6 are a perspective view of the main parts of the metal spiral tube manufacturing apparatus; FIGS. 5 and 6 are respectively a bottom perspective view and a bottom view of the positioning member used in the metal spiral tube manufacturing apparatus; and FIG. 8 are a perspective view and a plan view, respectively, showing a metal spiral tube and a tube in the middle of manufacture. l-table surface (workbench), 2 rotation/backward drive mechanism, 3--11 take-up roller, 31--1 inclined guide, 4
-111 positioning member, 41- ... positioning rod, 5.
50.51- Folding roller, 6- Freezer, 62--
1 outlet, 7--1 metal straight pipe, 70--1 starting end, 8-metal spiral pipe, 80-bent portion, 81
---Terminal part. Patent applicant Jung Jin Kim Agent Patent attorney Hisao Ishii 1st session Figure 5 Figure 7, 78 Figure 8

Claims (6)

[Claims] (1) When manufacturing the spiral tube 8 using the metal straight pipe 7, the metal straight pipe 7 is filled with a freezeable liquid, both ends of which are closed, and this is frozen in the freezer 6. A portion of the straight metal pipe 7 to be wound that is continuous with the starting end 70 is held between the winding roller 3 and the bending rollers 5, 50, and 51, and at least the winding roller 3 is rotationally driven to take up the winding. The rollers 3 and the bending rollers 5, 50, and 51 bend the metal straight pipe 7 with its internal liquid frozen body against the tube flattening force at the time of bending. The first winding portion 80 continuous to the starting end portion 70 is guided by the inclined guide portion 31 to the starting end portion 70.
and move the winding roller 3 backward within the winding plane and in a direction substantially perpendicular to the metal straight pipe 7 while further rotationally driving at least the winding roller 3. 7 is positioned within the winding plane at its starting end 70, and the metal spiral tube is wound in a spiral shape around the winding roller 3. (2) When winding the metal straight pipe 7 around the winding roller 3 in a spiral shape, the positioning member 4 is attached to the winding roller 3.
is attached, and the winding portion 80 of the metal straight pipe 7 is held between the positioning member 4 and the starting end 70 of the metal straight pipe 7 to position it within the winding plane. A method for manufacturing a metal spiral tube according to claim (1). (3) The method for manufacturing a metal spiral tube according to claim 1 or 2, wherein the metal straight tube 7 is wound up on the winding roller 3 while being pulled out from the freezer 6. (4) A draw-out port 6 provided adjacent to the workbench 1 for drawing out the metal straight pipe 7 to be spirally wound from one end side.
2, and a freezer 6 for freezing the liquid filled in the metal straight pipe 7; The first winding portion 80 of the metal straight pipe 7 is attached to the starting end 70 of the metal straight pipe 7 on the outer peripheral surface.
A winding roller 3 is formed to displace the metal straight pipe 7 in a spiral shape, and an inclined guide part 31 is provided adjacent to the winding roller 3, and is disposed adjacent to the winding roller 3, and is disposed adjacent to the winding roller 3, A bending roller 5 that bends the metal straight pipe 7 and causes the metal straight pipe 7 to be wound around the winding roller 3.
a rotational drive mechanism 2 that rotates at least the winding roller 3; and a retraction drive mechanism that retreats the winding roller 3 in a direction substantially perpendicular to the direction in which the metal straight pipe 7 is pulled out in accordance with the winding operation. 2. A metal spiral tube manufacturing device characterized by comprising: (5) A positioning member 4 is removably provided on the winding roller 3, and the positioning member 4 is provided with the metal straight pipe 7.
Manufacturing a metal spiral tube according to claim (4), characterized in that a positioning rod 41 is formed between the starting end 70 of the metal spiral tube and a positioning rod 41 for sandwiching the winding portion 80 and positioning it within the winding surface. Device. (6) The bending roller 5 is composed of a small-diameter roller 50 that bends the metal straight pipe 7 into a small-diameter spiral inner part, and a large-diameter roller 51 that bends the metal straight pipe 7 into a large-diameter spiral outer part. Claim (4) or (5) characterized in that the roller 50 and the large diameter roller 51 are selectable.
The apparatus for manufacturing the metal spiral tube described above.