JP2008023537A - Method for producing double tube with curved part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for easily producing a double tube with a curved part, which has an inner tube and an outer tube, wherein a fluid can be made to flow to a gap between the inner tube and outer tube, and to the hollow of the inner tube. <P>SOLUTION: The outer circumferential face of an inner tube is brought into contact with wire, thereafter, the inner tube brought into contact with the wire is inserted into the hollow of the outer tube, so as to form the double tube, and the double tube is subjected to bending, In only such a manner, the double tube with a curved part, which has an inner tube and an outer tube, wherein a fluid can be made to flow to a gap between the inner tube and outer tube, and to the hollow of the inner tube, can easily be produced, wherein when the inner tube is brought into contact with the wire, the wire is not made to cross each other. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a double pipe having an inner pipe and an outer pipe and having a curved portion.

  Conventionally, in a double tube comprising an inner tube and an outer tube, a spiral fin or groove is provided on the outer peripheral surface of the inner tube or the inner peripheral surface of the outer tube, the gap between the inner tube and the outer tube, A double pipe having a curved portion in which a fluid flows into the hollow has been developed (for example, see Patent Document 1).

However, in the production of a double pipe having a curved portion as described above, it is difficult to form a spiral fin or groove on the outer peripheral surface of the inner pipe or the inner peripheral surface of the outer pipe, and the problem is that workability is deteriorated It has become.
JP 2001-201275 A

  Therefore, the present invention includes an inner tube and an outer tube, allows fluid to flow through the gap between the inner tube and the outer tube, and the hollow of the inner tube, and easily manufactures a double tube having a curved portion. It aims to provide a method that can be used.

  In order to solve the above problems, a manufacturing method according to the present invention includes an inner tube and an outer tube, and can flow a fluid through a gap between the inner tube and the outer tube and a hollow of the inner tube, A method of manufacturing a double pipe having a step of bringing a wire into contact with the outer peripheral surface of the inner pipe, and forming the double pipe by inserting the inner pipe with the wire in contact with the hollow of the outer pipe And a step of bending the double pipe, wherein the wires brought into contact with the inner pipe do not cross each other.

  The contact of the wire with the outer peripheral surface of the inner tube may be performed by spirally winding one or a plurality of the wires around the outer peripheral surface of the inner tube. It may be performed by fixing three or more wires at equal intervals along the longitudinal direction.

  According to the present invention, an inner tube and an outer tube are provided, a fluid can flow through the gap between the inner tube and the outer tube and the hollow of the inner tube, and a double tube having a curved portion is easily manufactured. A method that can be provided can be provided.

  Hereinafter, preferred embodiments will be described in detail with reference to the accompanying drawings.

  A manufacturing method according to the present invention is a method of manufacturing a double pipe having an inner pipe and an outer pipe and having a curved portion, the step of bringing a wire into contact with the outer peripheral surface of the inner pipe, A step of inserting the tube into the hollow of the outer tube to form a double tube, and a step of bending the double tube.

  For the contact of the wire to the outer peripheral surface of the inner tube, for example, a wire is wound around the outer peripheral surface of the inner tube or a welding method such as spot welding is used so that the wires brought into contact with the outer peripheral surface of the inner tube do not contact each other. The wire can be fixed to the outer peripheral surface of the inner tube.

  One wire may be wound around the outer peripheral surface of the inner tube, but a plurality of wires are preferable. By winding a plurality of wires in this way, the area where the wires come into contact with the inner tube can be increased even if the winding pitch is moderately angled, and the crushing of the tube that occurs during bending of the double tube can be prevented. It becomes easy to suppress. When winding a plurality of wires around the outer peripheral surface of the inner tube, the wires may be wound as long as they are not in contact with each other. Alternatively, a plurality of wires may be installed at substantially equal intervals, and the wires may be wound in parallel. Note that the winding of the wire may be performed randomly, but may be performed in a spiral shape (at a constant pitch).

  The fixing of the wire to the outer peripheral surface of the inner tube may be performed by arranging three or more wires along the longitudinal direction at substantially equal intervals with respect to the outer periphery of the inner tube so that the wires do not contact each other. Further, three or more linear wires may be provided along the longitudinal direction in parallel to the outer circumference of the inner tube at substantially equal intervals.

  FIG. 1 shows a schematic configuration of a double tube 100 in which an inner tube in which one wire is spirally wound on an outer peripheral surface is inserted into a hollow of an outer tube, which is described as an embodiment of the present invention. As shown in FIG. 1, the double tube 100 includes an inner tube 10, a single wire 30 spirally wound around the outer peripheral surface of the inner tube 10 at regular intervals, and a wire 30 on the outer peripheral surface of the inner tube 10. And an outer tube 20 having an inner diameter large enough to be inserted. The inner tube 10 in which the wire 30 is wound around the outer peripheral surface is disposed in the outer tube 20. As shown in FIG. 1, the wire 30 may be wound from end to end in the longitudinal direction of the inner tube 10, or may be wound around a part of the outer peripheral surface of the inner tube 10. . The thickness of the wire 30 is not particularly limited as long as the inner tube 10 in which the wire 30 is wound around the outer peripheral surface can be inserted into the hollow of the outer tube 20, but the outer tube 20 and the inner tube are not limited. 10 is about 95% of the average gap (clearance) generated between the inner tube 10 and the gap generated between the wire 30 wound around the inner tube 10 and the outer tube 20 is about 0.2 mm on average. Such a size is preferable.

  Next, a schematic configuration of the double pipe 200 in which an inner pipe having three wires on the outer peripheral surface along the longitudinal direction and parallel to the longitudinal direction is inserted in the hollow of the outer pipe will be described as an embodiment of the present invention. FIG. 2A shows a cross-sectional view (cross-sectional view cut along a′-a ′) of the double pipe 200 shown in FIG. 2A. As shown in FIG. 2, the double pipe 200 is configured so that the inner pipe 110 and the outer circumference of the inner pipe 110 are arranged at approximately equal intervals and parallel to the longitudinal direction of the inner pipe 110. Three wires 130 fixed to the outer peripheral surface of the inner tube 110 and an outer tube 120 having an inner diameter large enough to allow the wire 130 fixed to the outer peripheral surface of the inner tube 110 to be inserted. The inner tube 110 having the wire 130 fixed to the outer peripheral surface is disposed in the outer tube 120. The three or more wires 130 fixed to the outer peripheral surface of the inner tube 110 may be provided from end to end in the longitudinal direction of the inner tube 110 as shown in FIG. It is good also as providing in a part of outer peripheral surface. The thickness of the wire 130 is not particularly limited as long as the inner tube 110 in which three or more wires 130 are fixed to the outer peripheral surface can be inserted into the hollow of the outer tube 120. 95% of the average clearance (clearance) generated between the inner tube 110 and the inner tube 110, or the average clearance generated between each wire 130 fixed to the inner tube 110 and the outer tube 120 is 0.2 mm. It is preferable that it is a magnitude | size which becomes a grade.

  By bending the double pipes 100 and 200 formed as described above by a known bending method (for example, a bending method using a pipe bender, etc.), for example, a bent portion 40 as shown in FIG. It is possible to manufacture the double pipe 100 having the same.

  As described above, by using the wires 30 and 130 in place of the fins and grooves, the wires 30 and 130 can be easily brought into contact with the outer peripheral surface of the inner tubes 10 and 110, and even if bending is performed, the curved portion A gap can be secured between the inner pipes 10 and 110 and the outer pipes 20 and 120 at 40. Further, since the inner tubes 10 and 110 having the wires 30 and 130 in contact with the outer peripheral surface can be inserted into the outer tubes 20 and 120, the inner tubes 10 and 110 and the outer tubes 20 and 120 are provided. A fluid (including a mixed liquid such as slurry or suspension) can flow through the gap between the tubes 10 and 110 and the outer tubes 20 and 120 and the hollow of the inner tubes 10 and 110, and has a curved portion 40. It becomes possible to manufacture the double tubes 100 and 200 simply and efficiently.

  Further, as described above, by providing the wires 30 and 130 in contact with the outer peripheral surfaces of the inner tubes 10 and 110, the outer peripheral surface of the inner tube has been conventionally used to secure a space between the inner tube and the outer tube. Alternatively, it is possible to avoid clogging of the slurry caused by a large number of spacers provided on the inner peripheral surface of the outer tube.

  The materials of the inner tubes 10 and 110, the outer tubes 20 and 120, and the wires 30 and 130 of the double tubes 100 and 200 are not particularly limited, but metals having excellent heat conductivity and heat resistance, for example, , Copper, aluminum, alloy (for example, copper alloy, aluminum alloy, corrosion resistant alloy, heat resistant alloy, etc.), etc., so that the hollow passages of the inner pipes 10, 110, the inner pipes 10, 110 and the outer pipes The heat exchange between the high-temperature fluid and the low-temperature fluid that flows in the opposite direction through the passage between 20 and 120 can be performed efficiently. Therefore, the double pipes 100 and 200 made of a metal excellent in heat conductivity and heat resistance are useful as a heat exchanger.

It is a figure which shows schematic structure of the double tube | pipe which inserted in the hollow of the outer tube | pipe the inner tube | pipe which helically wound one wire around the outer peripheral surface demonstrated as one Embodiment of this invention. 1 shows a schematic configuration and a cross-sectional view of a double pipe in which an inner pipe having three wires arranged along an outer circumferential surface at a substantially equal interval and parallel to the longitudinal direction is inserted into a hollow of an outer pipe, which is described as an embodiment of the present invention. FIG. In one Embodiment of this invention, it is a figure which shows schematic structure of the double tube | pipe which has a curved part.

Explanation of symbols

10,110 Inner pipe 20,120 Outer pipe 30,130 Wire 40 Curved part 100,200 Double pipe

Claims (3)

An inner tube and an outer tube, a method for producing a double tube having a curved portion, capable of flowing a fluid through a gap between the inner tube and the outer tube and a hollow of the inner tube,
Contacting the wire with the outer peripheral surface of the inner tube;
Inserting the inner tube with the wire in contact with the hollow of the outer tube to form a double tube; and
Bending the double pipe;
Including
A method characterized in that the wires brought into contact with the inner pipe do not cross each other.   The method according to claim 1, wherein one or a plurality of the wires are spirally wound around and contacted with the outer peripheral surface of the inner tube. 2. The method according to claim 1, wherein three or more wires are fixed to the outer circumference of the inner tube at substantially equal intervals by being fixed along the longitudinal direction.

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