JP2018100721A - Manufacturing method of combined pipe and combined pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a combined pipe that can be continuously molded and fast molded, and a manufacturing method of the combined pipe capable of obtaining the combined pipe that can be continuously molded and fast molded.SOLUTION: A combined pipe 10 comprises: a corrugated pipe 1 including an outer peripheral face 1f formed in an uneven shape along an axis O; an elastic layer 2 that is disposed on the outer peripheral face 1f of the pipe 1 in such a manner that the outer peripheral face 1f is enclosed; and a reinforcement layer 3 consisting of at least one reinforcement wire 3a that is spirally wound around an outer peripheral face 2f of the elastic layer 2. A manufacturing method of a combined pipe is a manufacturing method of the combined pipe 10 comprising the corrugated pipe 1 and the reinforcement layer 3. The manufacturing method includes the steps of: disposing the elastic layer 2 on the outer peripheral face 1f of the pipe 1 in such a manner that the outer peripheral face 1f is enclosed around the axis O; and forming the reinforcement layer 3 by spirally winding the at least one reinforcement wire 3a around the outer peripheral face 2f of the elastic layer 2.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for manufacturing a composite pipe and a composite pipe.

  As a conventional composite pipe, for example, a corrugated pipe is covered with a reinforcing layer (fiber layer) and a covering layer (thermoplastic resin layer) for the purpose of supplying a high-temperature and high-pressure cleaning liquid (for example, Patent Documents). 1). The corrugated tube, which is the inner tube of the composite tube, is not easily crushed even when bent with a small radius of curvature, and is excellent in flexibility.

International Publication No. 97/47907

  In such a composite pipe, since the inner pipe has a corrugated shape, a structure in which fibers are knitted (blade reinforcing structure) is usually employed for the reinforcing layer.

  However, when adopting a structure in which fibers are knitted into the reinforcing layer, for example, the knitting or the like cannot be performed in the same process as the lamination process of the inner pipe and the reinforcing layer. Have difficulty. Therefore, if the fiber is spirally wound on the outer peripheral surface of the corrugated tube, continuous molding and high-speed production are possible.

  However, as a result of intensive studies, the inventor of the present application has made it possible to perform continuous molding and high-speed production when the fiber is spirally wound, but when the fiber is sandwiched between the irregularities on the outer peripheral surface of the corrugated tube, The flexibility was lost, and as a result, it was recognized that a method of simply spiral winding could not be adopted.

  An object of the present invention is to provide a composite pipe capable of continuous molding and high-speed production. Another object of the present invention is to provide a method for manufacturing a composite pipe, which can obtain a composite pipe capable of continuous molding and high-speed production.

The composite pipe according to the present invention includes a corrugated pipe having an outer peripheral surface formed in an uneven shape along an axis, and the corrugated pipe so as to surround the outer peripheral surface of the corrugated pipe around the axis of the corrugated pipe An elastic layer disposed on the outer peripheral surface of the elastic layer, and a reinforcing layer composed of at least one reinforcing wire spirally wound around the axis with respect to the outer peripheral surface of the elastic layer. Here, the “reinforcing wire” refers to, for example, one fiber yarn, a twisted fiber obtained by twisting a plurality of fiber yarns, a fiber bundle in which a plurality of fiber yarns or twisted fibers are bundled together with an adhesive or the like. .
According to the composite pipe according to the present invention, since the reinforcing layer has a structure in which the reinforcing wire is spirally wound, the composite pipe is capable of continuous molding and high-speed production.

In the composite pipe according to the present invention, it is preferable that the elastic layer is disposed on the outer peripheral surface of the corrugated pipe in a state where a void is formed in a recess formed by the outer peripheral face of the corrugated pipe.
In this case, the corrugated tube is a composite tube in which the flexibility is maintained.

In the composite pipe according to the present invention, the elastic layer is disposed on the outer peripheral surface of the corrugated pipe in a state where the elastic layer is bent inward in the radial direction of the corrugated pipe in a recess formed by the outer peripheral face of the corrugated pipe. It is preferable that
In this case, the corrugated tube is a composite tube in which the flexibility is further maintained.

A method for manufacturing a composite pipe according to the present invention is a manufacture of a composite pipe having a corrugated pipe having an outer peripheral surface formed in a concavo-convex shape along an axis, and a reinforcing layer disposed on a radially outer side of the corrugated pipe. An elastic layer disposing step of disposing an elastic layer on the outer peripheral surface of the corrugated pipe so as to surround the outer peripheral surface of the corrugated pipe around the axis of the corrugated pipe; and at least one reinforcing wire. A reinforcing layer forming step of forming the reinforcing layer by spiral winding around the axis with respect to the outer peripheral surface of the elastic layer.
According to the composite pipe manufacturing method of the present invention, the reinforcing wire can be spirally wound, and a composite pipe capable of continuous molding and high-speed production can be obtained.

In the composite pipe manufacturing method according to the present invention, in the elastic layer arranging step, the elastic layer is bent toward the inside in the radial direction of the corrugated pipe in the recess formed by the outer peripheral surface of the corrugated pipe. Thus, it is preferable to arrange on the outer peripheral surface of the corrugated tube.
In this case, a composite tube in which the flexibility of the corrugated tube is further maintained can be obtained.

  According to the present invention, a composite pipe capable of continuous molding and high-speed production can be provided. Moreover, according to this invention, the manufacturing method of a composite pipe | tube which can obtain the composite pipe | tube which can be continuously shape | molded and high-speed production can be provided.

It is a schematic cross section which shows the composite pipe which concerns on 1st embodiment of this invention. It is a schematic cross section which shows the composite pipe which concerns on 2nd embodiment of this invention. It is a schematic cross section which shows the composite pipe which concerns on 3rd embodiment of this invention.

  Hereinafter, composite tubes according to various embodiments of the present invention will be described with reference to the drawings. Moreover, the manufacturing method of the composite pipe | tube which concerns on various embodiment of this invention which can manufacture the said composite pipe | tube is also demonstrated collectively.

[First Embodiment]
FIG. 1 is a schematic cross-sectional view showing a composite tube 10 according to the first embodiment of the present invention, which is manufactured using the composite tube manufacturing method according to the first embodiment of the present invention.

<Composite pipe>
A composite tube 10 according to the first embodiment of the present invention shown in FIG. 1 includes a corrugated tube 1 having an outer peripheral surface 1f formed in an uneven shape along an axis O, and an outer peripheral surface 1f of the corrugated tube 1 on the axis O. An elastic layer 2 disposed on the outer peripheral surface 1f of the corrugated tube 1 so as to surround the periphery, and at least one spiral wound around an axis O with respect to the outer peripheral surface 2f of the elastic layer 2 And a reinforcing layer 3 composed of the reinforcing wire 1a. Here, the reinforcing wire 3a refers to, for example, one fiber yarn, a twisted fiber obtained by twisting a plurality of fiber yarns, and a fiber bundle in which a plurality of fiber yarns or twisted fibers are bundled together with an adhesive or the like. Details of the composite pipe according to this embodiment are as follows.

  In FIG. 1, reference numeral 1 denotes a corrugated tube. In the present embodiment, as shown in FIG. 1, the tube wall 1 w of the corrugated tube 1 is formed in a concavo-convex shape (bellows shape) along the axis (in this embodiment, the central axis) O of the corrugated tube 1. . Moreover, in this embodiment, the corrugated pipe 1 has the outer peripheral surface 1f formed in uneven | corrugated shape along the axis | shaft O. As shown in FIG.

  As shown in FIG. 1, in this embodiment, the tube wall 1w of the corrugated tube 1 is formed so that the cross-sectional uneven shape thereof is a rectangular shape. Specifically, the tube wall 1w of the corrugated tube 1 is formed by an outer diameter portion 1wa, an inner diameter portion 1wb, and a connecting portion 1wc that connects the outer diameter portion 1wa and the inner diameter portion 1wb. That is, in the present embodiment, the inner diameter portion 1wb and the connecting portion 1wc form a recess 1n. However, the cross-sectional uneven shape of the tube wall 1w of the corrugated tube 1 is not limited to a rectangular shape. For example, the cross-sectional uneven shape of the tube wall 1w of the corrugated tube 1 can be formed into a triangular shape, a corrugated shape, or the like. Moreover, when the cross-sectional uneven shape is a polygonal shape such as a rectangular shape or a triangular shape, the corners of the polygonal shape may be rounded.

  In this embodiment, the material of the corrugated pipe 1 is a resin. As such a resin, for example, it is preferable to use an engineering plastic excellent in strength and heat resistance. An example of the engineering plastic is polyamide (PA). Examples of the polyamide include aliphatic polyamides such as polyamide 6 and polyamide 66, and semi-aromatic polyamides such as polyamide MXD6 (PAMXD6) and polyamide 9T (PA9T). Semi-aromatic polyamides are particularly thin and excellent in fluidity. For this reason, it is preferable to use a semi-aromatic polyamide.

  Moreover, as a material of the corrugated pipe | tube 1, what mixed aliphatic polyamides, what mixed semi-aromatic polyamides, or what mixed aliphatic polyamide and semi-aromatic polyamide should be used. Can do. Or the corrugated pipe | tube 1 can be comprised with the laminated body which laminated | stacked at least any one of aliphatic polyamide, semi-aromatic polyamide, and these mixtures. When at least one of these mixed materials and laminated structure is adopted, the heat resistance of the corrugated pipe 1 can be improved, and as a result, the heat resistance of the composite pipe 10 can be improved.

  Moreover, the corrugated pipe | tube 1 can be comprised by the laminated body etc. which laminated | stacked the olefin resin (for example, polyethylene, a polypropylene) and the ethylene-vinyl alcohol copolymer (EVOH). In this case, the barrier performance against the refrigerant as the composite pipe 10 can be improved.

  Reference numeral 2 denotes an elastic layer. The elastic layer 2 is disposed on the outer peripheral surface 1f of the corrugated tube 1 so as to surround the outer peripheral surface 1f of the corrugated tube 1 around the axis O. In the present embodiment, the elastic layer 2 surrounds the outer peripheral surface 1f of the corrugated tube 1 in a tubular shape. In the composite pipe 10 according to the present embodiment, the elastic layer 2 is disposed on the outer peripheral surface 1f of the corrugated pipe 1 such that a gap C is formed in the recess 1n formed by the outer peripheral face 1f of the corrugated pipe 1. In particular, in the present embodiment, the elastic layer 2 has an outer periphery of the corrugated tube 1 in a state where a bend 2a is generated in the recess 1n formed by the outer peripheral surface 1f of the corrugated tube 1 toward the radially inner side of the corrugated tube 1. It is arranged on the surface 1f.

  The elastic layer 2 is preferably made of rubber or elastomer. In the present embodiment, the elastic layer 2 is made of an elastomer. Elastomer does not require vulcanization and can be used as it is after molding. Examples of the elastomer include a urethane elastomer such as a copolymer of urethane and rubber or a mixture thereof, an olefin elastomer such as a copolymer of an olefin resin such as polyethylene and a rubber, specifically, BASF Corporation Examples thereof include polyolefin elastomers such as Elastollan (registered trademark) and Pandex (registered trademark) series manufactured by DIC. In this embodiment, the elastic layer 2 is composed of a copolymer of urethane and rubber having excellent elasticity. In the present embodiment, the elastic layer 2 can be made of an elastic material such as resin.

  Reference numeral 3 denotes a reinforcing layer. The reinforcing layer 3 is at least one reinforcing wire spirally wound around the axis of the elastic layer 2 (in the present embodiment, coaxial with the axis O of the corrugated tube 1) with respect to the outer peripheral surface 2f of the elastic layer 2. 3a (details are not shown).

  In this embodiment, as the reinforcing wire 3a, for example, one resin fiber yarn, a twisted resin fiber obtained by twisting a plurality of resin fiber yarns, a plurality of resin fiber yarns or a twisted resin fiber are combined into one by an adhesive or the like. Examples of bundled resin fiber bundles. Examples of the resin fiber include polyester fiber or nylon fiber. In the present embodiment, the reinforcing wire 3a is composed of a twisted polyester fiber obtained by twisting a plurality of polyester fiber threads.

  Reference numeral 4 denotes a jacket layer. The jacket layer 4 protects the reinforcing layer 3. In this embodiment, the jacket layer 4 is made of an elastomer such as an olefin elastomer, specifically, a polyolefin elastomer such as Elastollan (registered trademark) manufactured by BASF or Pandex (registered trademark) series manufactured by DIC. Alternatively, it can be composed of a synthetic resin such as a urethane-based synthetic resin.

  According to the composite pipe 10 according to the present embodiment, the reinforcing wire 3 a is spirally wound around the outer peripheral surface 2 f of the elastic layer 2. For this reason, as shown in FIG. 1, the composite pipe 10 according to the present embodiment has a structure in which the reinforcing wire 3 a is not easily caught between the concave portions 1 n of the corrugated pipe 1. Therefore, according to the composite pipe 10 according to the present embodiment, it is possible to adopt a structure in which the reinforcing wire 1a is spirally wound (spiral reinforcing structure), and a composite pipe capable of continuous molding and high-speed production is obtained.

  In particular, in the composite pipe 10 according to the present embodiment, the elastic layer 2 is disposed on the outer peripheral surface 1f of the corrugated pipe 1 such that a gap C is formed in the recess 1n formed by the outer peripheral face 1f of the corrugated pipe 1. . In this case, since the gap C is formed between the concave portion 1 n of the corrugated tube 1 and the elastic layer 2, the reinforcing wire 3 a is less likely to be sandwiched between the concave portions 1 n of the corrugated tube 1. Further, in the corrugated tube 1, the elastic layer 2 and the reinforcing wire 3 a are connected to the inner diameter portion 1 wb and the connecting portion 1 wc of the tube wall 1 w (particularly, as much as the gap C is formed between the concave portion 1 n of the corrugated tube 1 and the elastic layer 2. There is no direct interference with the corner portion A). For this reason, even when the composite pipe 10 is bent, the flexibility in the recess 1n is maintained. Therefore, according to the composite tube 10 according to the present embodiment, the composite tube 10 in which the flexibility of the corrugated tube 1 is maintained.

  Furthermore, the composite pipe 10 according to the present embodiment has an outer periphery of the corrugated pipe 1 in a state where the elastic layer 2 has a recess 2n formed by the outer peripheral surface 1f of the corrugated pipe 1 and a bend 2a is generated radially inward of the corrugated pipe 1. It is arranged on the surface 1f. In this case, the elastic layer 2 can follow the bending of the corrugated tube 1 by the amount of expansion / contraction of the flexure 2a without depending on its elastic performance. That is, in the composite tube 10, the elastic force of the elastic layer 2 does not have to regulate the bending of the corrugated tube 1 by the amount of the bending 2 a generated in the elastic layer 2. Therefore, according to the composite pipe 10 which concerns on this embodiment, it becomes a composite pipe with which the flexibility of the corrugated pipe 1 was maintained more.

<Production method of composite pipe>
The composite pipe manufacturing method according to the present invention includes an elastic layer arranging step of arranging an elastic layer on the outer peripheral surface of the corrugated pipe so as to surround the outer peripheral face of the corrugated pipe around the axis of the corrugated pipe, A reinforcing layer forming step in which one reinforcing wire is spirally wound around the axis with respect to the outer peripheral surface of the elastic layer to form the reinforcing layer.

  Next, with reference to FIG. 1, the manufacturing method of the composite pipe | tube based on this embodiment is demonstrated.

  In the manufacturing method of the composite pipe according to the present embodiment, after the elastic layer 2 is disposed on the outer peripheral face 1f of the corrugated pipe 1 so as to surround the outer peripheral face 1f of the corrugated pipe 1 around the axis O, at least one is provided. The reinforcing wire 3a is spirally wound around the axis O with respect to the outer peripheral surface 2f of the elastic layer 2 to form the reinforcing layer 3, and then the outer cover layer 4 is disposed on the outer peripheral surface 3f of the reinforcing layer 3. In more detail, it is as follows.

(Elastic layer placement step)
In the method for manufacturing a composite tube according to the present embodiment, first, an elastic layer arranging step is executed. In the present embodiment, in the elastic layer disposing step, the elastic layer 2 is disposed on the outer peripheral surface 1 f of the corrugated tube 1 so as to surround the outer peripheral surface 1 f of the corrugated tube 1 around the axis O of the corrugated tube 1. In the embodiment, the elastic layer 2 surrounds the outer peripheral surface 1f of the corrugated tube 1 in a tubular shape.

  As the elastic layer 2, for example, a cylindrical member obtained by extruding an elastomer into a cylindrical shape can be used. In this case, the elastic layer 2 can be arranged by extruding the corrugated tube 1 in advance and cooling it, and then extruding the elastomer together with the corrugated tube 1 with a crosshead to coat it. Or only the said cylindrical member can also be shape | molded previously. In this case, the elastic layer 2 can be arranged by inserting the corrugated tube 1 inside the cylindrical member. Further, as the elastic layer 2, for example, an elastomer sheet member can be used. In this case, the elastic layer 2 can be arranged by winding the sheet member around the axis O around the outer peripheral surface 1 f of the corrugated tube 1. In the case where the elastic layer 2 is composed of a sheet member, a rubber sheet member can be used instead of the elastomer.

  In particular, in the present embodiment, in the elastic layer arranging step, as shown in FIG. 1, the void C is formed in the concave portion 1 n of the concave and convex shape formed by the outer peripheral surface 1 f of the corrugated tube 1 along the axis O. In this step, the elastic layer 2 is disposed on the outer peripheral surface 1 f of the corrugated tube 1. In the present embodiment, the elastic layer 2 is in contact with the outer peripheral surface 1f of the outer diameter portion 1wa of the tube wall 1w in the tube wall 1w of the corrugated tube 1. As a result, a gap C is secured between the elastic layer 2 and the recess 1 n formed by the outer peripheral surface 1 f of the corrugated tube 1. In the present embodiment, since the gap C is secured, in the corrugated tube 1, the connection portion (hereinafter also referred to as “corner portion”) A between the inner diameter portion 1 wb and the connecting portion 1 wc of the tube wall 1 w is possible. Flexibility is ensured.

  Further, in the present embodiment, the elastic layer disposing step is such that the bending 2a is directed inward in the radial direction of the corrugated tube 1 at the recessed portion 1n of the uneven shape formed by the outer peripheral surface 1f of the corrugated tube 1 along the axis O. This is a step of disposing the elastic layer 2 on the outer peripheral surface 1f of the corrugated tube 1 so as to occur. In the present embodiment, the elastic layer 2 is arranged loosely so that a bending 2a occurs between the outer diameter portions 1Wa of the tube wall 1w of the corrugated tube 1. The bending amount of the bending 2a can be appropriately adjusted by bringing the elastic layer 2 into contact with the outer peripheral surface 1f from the outer diameter portion 1wa of the tube wall 1w to a part of the connecting portion 1wc.

(Reinforcing layer formation step)
In the composite pipe manufacturing method according to this embodiment, the reinforcing layer forming step is executed after the elastic layer arranging step. In the present embodiment, in the reinforcing layer forming step, the reinforcing layer 3 is formed by spirally winding at least one reinforcing wire 3 a around the axis O around the outer peripheral surface 2 f of the elastic layer 2.

  In the present embodiment, one reinforcing wire 3a is spirally wound around the axis O along the axis O with respect to the outer peripheral surface 2f of the elastic layer 2. Thereby, the reinforcement layer 3 becomes a single-layer reinforcement layer comprised by the one reinforcement line 3a. In the present embodiment, the reinforcing wire 3 a is wound around the outer peripheral surface 2 f of the elastic layer 2. For this reason, the space | gap C formed between the recessed part 1n which the outer peripheral surface 1f of the corrugated pipe | tube 1 forms and the elastic layer 2 is still ensured.

  The reinforcing layer 3 is a multi-layered reinforcing layer formed by further overlapping the spiral winding along the axis O with the same type or other types of reinforcing wires 3a used for the previous spiral winding. You can also The reinforcing layer forming step can be continuously performed on the same line as the elastic layer arranging step. For example, while the elastic layer 2 is extruded together with the corrugated tube 1, the spiral winding of the reinforcing wire 3 a can be performed on the outer peripheral surface 2 f of the elastic layer 2 after the elastic layer 2 is arranged.

(Coating layer placement step)
Furthermore, in the method for manufacturing a composite pipe according to the present embodiment, a covering layer arranging step is executed after the reinforcing layer forming step. In the covering layer arranging step, the covering layer 4 is arranged on the outer peripheral surface 3 f of the reinforcing layer 3. In the present embodiment, the jacket layer 4 is made of an elastomer.

  As the jacket layer 4, for example, a cylindrical member obtained by extruding an elastomer into a cylindrical shape can be used. In this case, the covering layer 4 can be arranged by extruding the corrugated tube 1 in advance and cooling it, and then extruding the elastomer together with the corrugated tube 1 with a crosshead to coat it. Or only the said cylindrical member can also be shape | molded previously. In this case, the covering layer 4 can be arranged by inserting the corrugated pipe 1 in which the reinforcing layer 3 is formed inside the cylindrical member. As the jacket layer 4, for example, the elastomer sheet member can be used. In this case, the covering layer 4 is arranged by winding the sheet member around the axis O around the outer peripheral surface 3f of the reinforcing layer 3 formed on the corrugated tube 1, and bonding the wound end portion or the like. Can do.

  According to the composite pipe manufacturing method of the present embodiment, the elastic layer 2 is arranged on the outer peripheral surface 1 f of the corrugated pipe 1 in the elastic layer arranging step. Next, in the reinforcing layer forming step, the reinforcing wire 3 a is wound around the outer peripheral surface 2 f of the elastic layer 2 by spiral winding. In this case, the reinforcing wire 3a is less likely to be sandwiched between the concave portions 1n of the corrugated tube 1 because the elastic layer 2 is disposed. For this reason, the softness | flexibility (flexibility) of the corrugated pipe | tube 1 is not impaired. Therefore, according to the composite pipe manufacturing method of the present embodiment, the reinforcing wire 3a can be spirally wound, and a composite pipe capable of continuous molding and high-speed production can be obtained.

  In particular, in the present embodiment, the elastic layer disposing step is performed such that the void C is formed in the concave portion 1n of the concave-convex shape formed by the outer peripheral surface 1f of the corrugated tube 1 along the axis O. This is a step of disposing the elastic layer 2 on the surface 1f. In this case, the reinforcing wire 3 a is further less likely to be sandwiched between the concave portions 1 n of the corrugated tube 1, because the gap C is formed between the concave portion 1 n of the corrugated tube 1 and the elastic layer 2. Further, in the corrugated tube 1, the elastic layer 2 and the reinforcing wire 3 a are connected to the inner diameter portion 1 wb and the connecting portion 1 wc (particularly, the corrugated tube 1) because the gap C is formed between the concave portion 1 n of the corrugated tube 1 and the elastic layer 2. There is no direct interference with the corner portion A). For this reason, even when the composite pipe 10 is bent, the flexibility in the recess 1n is maintained. Therefore, according to the method for manufacturing a composite pipe according to this embodiment, a composite pipe in which the flexibility of the corrugated pipe 1 is maintained can be obtained.

  Furthermore, in the present embodiment, the elastic layer placement step is performed such that a bend 2a is generated radially inward of the corrugated tube 1 at the recessed portion 1n of the uneven shape formed by the outer peripheral surface 1f of the corrugated tube 1 along the axis O. In this step, the elastic layer 2 is disposed on the outer peripheral surface 1 f of the corrugated tube 1. In this case, the elastic layer 2 can follow the bending of the corrugated tube 1 by the amount of expansion / contraction of the flexure 2a without depending on its elastic performance. In other words, in the composite pipe 10 as a product, the elastic force of the elastic layer 2 does not have to regulate the bending of the corrugated pipe 1 by the amount that the elastic layer 2 is bent 2a. Thereby, according to the manufacturing method of a composite pipe concerning this embodiment, the composite pipe with which the flexibility of corrugated pipe 1 was maintained more can be obtained.

[Second Embodiment]
FIG. 2 is a schematic cross-sectional view showing the composite pipe according to the second embodiment of the present invention, which is manufactured using the composite pipe manufacturing method according to the second embodiment of the present invention. In the following description, substantially the same parts as those in the embodiment of FIG.

<Production method of composite pipe> / <Composite pipe>
In the method for manufacturing a composite pipe according to this embodiment, the three steps of (elastic layer arranging step), (reinforcing layer forming step) and (outer layer arranging step) are the same as in the manufacturing method according to the first embodiment. have. In the present embodiment, in the elastic layer arranging step, as shown in FIG. 2, the void C is formed in the concave portion 1n of the concave-convex shape that the outer peripheral surface 1f of the corrugated tube 1 forms along the axis O. This is a step of disposing the elastic layer 2 on the outer peripheral surface 1 f of the corrugated tube 1. In the present embodiment, as in the method for manufacturing a composite pipe according to the first embodiment, the elastic layer 2 is formed on the outer peripheral surface 1f of the outer diameter portion 1wa of the pipe wall 1w among the pipe walls 1w of the corrugated pipe 1. Touching. In the present embodiment, the elastic layer 2 is different from the first embodiment in that the elastic layer 2 is arranged so as not to cause the bending 2a. The composite pipe 20 manufactured using the manufacturing method according to the present embodiment has a sleeve shape in which the elastic layer 2 extends smoothly along the axis O. Also in this case, the reinforcing wire 3a is less likely to be sandwiched between the concave portions 1n of the corrugated tube 1 because the gap C is formed between the concave portion 1n of the corrugated tube 1 and the elastic layer 2. Further, even when the composite pipe 20 is bent by the amount of the gap C formed, the flexibility in the recess 1n is maintained. Therefore, according to the composite pipe 20 which concerns on this embodiment, it becomes a composite pipe with which the flexibility of the corrugated pipe 1 was maintained.

[Third Embodiment]
FIG. 3 is a schematic cross-sectional view showing a composite pipe according to the third embodiment of the present invention, which is manufactured using the composite pipe manufacturing method according to the third embodiment of the present invention. In the following description, parts that are substantially the same as those of the other embodiments have the same reference numerals, and a description thereof is omitted.

<Production method of composite pipe> / <Composite pipe>
In the method for manufacturing a composite pipe according to the present embodiment, three steps of (elastic layer arranging step), (reinforcing layer forming step), and (outer layer arranging step) are the same as in the manufacturing method according to the other embodiments. have. In the present embodiment, the elastic layer disposing step is performed on the outer peripheral surface 1f of the corrugated tube 1 so as to surround the outer peripheral surface 1f of the corrugated tube 1 around the axis O of the corrugated tube 1, as shown in FIG. The elastic layer 2 is disposed. In the present embodiment, the elastic layer 2 is in contact with the outer diameter portion 1wa, the inner diameter portion 1wb, and the connecting portion 1wc of the tube wall 1w in the outer peripheral surface 1f of the corrugated tube 1. That is, in the present embodiment, the elastic layer 2 is different from the other embodiments in that the elastic layer 2 is disposed on the entire outer peripheral surface 1f of the corrugated tube 1. The composite pipe 30 manufactured using the manufacturing method according to the present embodiment does not have the gap C. In this case, the reinforcing wire 3a is less likely to be sandwiched between the concave portions 1n of the corrugated tube 1 because the elastic layer 2 is disposed. The elastic layer 2 is elastically deformed (stretched) following the bending deformation of the concave portion 1 n of the corrugated tube 1. Due to this elastic deformation, the composite pipe 30 can be flexible at the concave portion 1 n of the corrugated pipe 1. Therefore, according to the composite pipe 30 according to the present embodiment, the composite pipe with the flexibility of the corrugated pipe 1 is obtained.

  As described above, according to the present invention, a composite pipe capable of continuous molding and high-speed production can be provided. Moreover, according to this invention, the manufacturing method of a composite pipe | tube which can obtain the composite pipe | tube which can be continuously shape | molded and high-speed production can be provided.

  The above description merely discloses an embodiment of the present invention, and various modifications can be made according to the scope of the claims. Furthermore, the manufacturing method of the composite pipe | tube based on each structure of the composite pipe | tubes 10-30 mentioned above and each embodiment mentioned above can mutually be used suitably, or can be used in combination.

  1: corrugated tube, 1f: outer peripheral surface, 1n: recessed portion, 1w: tube wall, 1wa: outer diameter portion, 1wb: inner diameter portion, 1wc: connecting portion, 2: elastic layer, 2a: flexure, 2f: outer peripheral surface, 3 : Reinforcing layer, 3a: Reinforcing wire, 3f: Outer peripheral surface, 4: Outer coating layer, 10: Composite pipe (first embodiment), 20: Composite pipe (second embodiment), 30: Composite pipe (third implementation) Form), A: Corner part (connection part), C: Air gap, O: Shaft,

Claims (5)

A corrugated tube having an outer peripheral surface formed in an uneven shape along the axis;
An elastic layer disposed on the outer peripheral surface of the corrugated tube so as to surround the outer peripheral surface of the corrugated tube around the axis of the corrugated tube;
A reinforcing layer composed of at least one reinforcing wire spirally wound around the axis with respect to the outer peripheral surface of the elastic layer;
A composite tube comprising.   2. The composite pipe according to claim 1, wherein the elastic layer is disposed on an outer peripheral surface of the corrugated pipe in a state where a void is formed in a recess formed by the outer peripheral face of the corrugated pipe.   The elastic layer is disposed on the outer peripheral surface of the corrugated pipe in a state where the elastic layer is bent inward in the radial direction of the corrugated pipe in a recess formed by the outer peripheral surface of the corrugated pipe. 2. The composite tube according to 2. A method of manufacturing a composite pipe having a corrugated pipe having an outer peripheral surface formed in an uneven shape along an axis, and a reinforcing layer disposed on the radially outer side of the corrugated pipe,
An elastic layer disposing step of disposing an elastic layer on the outer peripheral surface of the corrugated tube so as to surround the outer peripheral surface of the corrugated tube around the axis of the corrugated tube;
Forming a reinforcing layer by spirally winding at least one reinforcing wire around the axis with respect to the outer peripheral surface of the elastic layer; and
A method of manufacturing a composite tube.   In the elastic layer arranging step, the elastic layer is arranged on the outer peripheral surface of the corrugated pipe so that the elastic layer is bent inward in the radial direction of the corrugated pipe in a recess formed by the outer peripheral surface of the corrugated pipe. The manufacturing method of the composite pipe | tube of Claim 4.

Images