JP2011085237A - Synthetic-resin heat-insulating hose - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat-insulating hose which is suitable as a drain hose of an air conditioner, whose whole body including a heat shield material is formed from olefin-based resin, and which is rich in flexibility in addition to elimination of the harmful effects of a heat-insulating hose whose inner and outer pipes and the like are made up of flexible polyvinyl chloride resin. <P>SOLUTION: There is provided a heat-insulating hose in which a heat-insulating layer 6' is formed by spirally winding at a constant pitch, via a partition wall 4 made up of the same material as that of the inner pipe 1, a heat-insulating material 6 made up of foamed polyethylene resin around an upper portion of the inner pipe 1 made up of olefin-based resin spirally wounding a core material 3 on the periphery and besides in which the heat-insulating layer 6 is covered with an outer pipe 5 made up of the same material as that of the inner pipe 1. In the heat-insulating hose, the heat-insulating material 6 is not welded to the inner and outer pipes 1, 5 to separate the joining surface with the inner and outer pipes 1, 5. At the same time, an inner end of the partition wall 4 is welded to the peripheral surface of the inner pipe 1, and an outer end of the partition wall 4 is connected to the outer pipe 5 to impart the flexibility of the hose. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a heat insulating hose suitable for use as a heat insulating duct for air-conditioning equipment and other various devices.

  As a heat insulating hose made of a synthetic resin, for example, as described in Patent Document 1 as a conventional example, a soft vinyl chloride in which a core material is internally provided on the outer peripheral surface of an inner tube made of a soft vinyl chloride resin. A hollow spiral ridge made of resin is formed and a string-like shape made of polyethylene foam resin is formed on the outer peripheral surface of the inner tube so as to cover the hollow spiral ridge through a partition wall made of the same material as the inner tube. A heat insulating material is spirally wound to form a heat insulating layer having a constant thickness, and the outer peripheral surface of the heat insulating layer is covered with a soft synthetic resin outer tube made of the same material as the inner tube. Widely known.

JP 7-174292 A

  However, according to the heat insulating hose, since the inner and outer pipes and the partition wall are made of vinyl chloride resin, the plasticizer contained in the soft vinyl chloride resin shifts during use, and the There is a risk of deforming or discoloring the expanded polystyrene used in the heat insulating material of the drain pan, and incinerating old hoses will generate harmful gases and cause environmental pollution problems. is there.

  On the other hand, in order to prevent the harmful effects caused by the plasticizer contained in the soft vinyl chloride resin, the inner and outer tubes and the partition wall are made of the same material polyethylene resin as the heat insulating material, and the whole is fused and integrated. However, if it does so, the whole will become rigid, flexibility will fall remarkably, and the problem that bending construction will become difficult will arise.

  The present invention has been made in view of such problems. The object of the present invention is to eliminate the harmful effects of a heat-insulating hose in which the entire hose is made of an olefin resin and the outer tube is made of a soft vinyl chloride resin. At the same time, it is an object of the present invention to provide a heat insulating hose that exhibits excellent flexibility and can perform bending work efficiently and accurately.

  In order to achieve the above object, the heat insulating hose of the present invention is made of the same material on the outer peripheral surface of the inner tube made of the soft olefin resin in which the core material is spirally wound around the outer peripheral surface as described in claim 1. A heat insulating layer is formed by spirally winding a heat insulating material made of polyethylene foam through a partition wall at a constant pitch, and this heat insulating layer is covered with an outer tube made of the same material as the inner tube. In the elastic hose, the inner and outer ends of the partition wall made of the soft olefin resin are integrally connected to the outer tube and the inner tube made of the soft olefin resin, respectively, while the heat insulating material made of the foamed polyethylene resin is The inner and outer pipes and the partition wall made of a soft olefin resin are joined in a releasable manner without fusing the opposing surfaces.

  In the heat insulating hose configured as described above, the invention according to claim 2 is characterized in that the inner end portion of the partition wall is fused to the outer peripheral surface of the inner tube and the outer end extension portion of the partition wall extends outside the heat insulating material. A part of the outer tube that covers the outer end surface without being fused to the end surface is formed, and then spirally wound on the outer end extension of the partition wall that has been spirally wound first. The outer tube is formed by sequentially fusing the outer end extension of the partition wall.

  According to the first aspect of the present invention, the inner and outer tubes and the partition wall of the heat insulating hose are made of a soft olefin resin, and the heat insulating layer provided between the inner and outer tubes is also an olefin resin. As a result, problems such as adverse effects caused by the migration of plasticizer contained in the vinyl chloride resin and environmental pollution caused by the inner and outer pipes and partition walls made of vinyl chloride resin can be solved. Although the heat insulating layer made of a heat insulating material spirally wound via a partition wall between the pipe and the inner and outer tubes made of a soft olefin resin and the foamed polyethylene resin that can be fused with the partition wall, Since the surfaces in contact with these inner and outer tubes and partition walls are releasably joined to the inner and outer tubes and partition walls without being fused, when the hose is bent, the outer peripheral surface portion that curves in a convex arc shape is pulled. Power On the other hand, a compressive force acts on the inner peripheral surface curved in the shape of a concave arc. On the inner peripheral surface on which the compressive force acts, even if the heat insulating layer is compressed, the outer tube is not compressed, and the outer tube is not compressed. The outer pipe part between the partition walls adjacent in the length direction is curved and deformed into a mountain shape with the fusion part with the outer end of these partition walls as a fulcrum, and the adjacent heat insulating materials are also partitioned through the partition wall. It can slide freely with respect to the wall surface, exhibiting excellent flexibility and flexibility, and even when bent, the bent portion does not deform into a flat shape and maintains a circular shape in cross section. Etc. can be smoothly distributed.

  According to the invention of claim 2, the inner end portion of the partition wall is integrally fused to the outer peripheral surface of the inner tube, and the outer end extension portion of the partition wall is fused to the outer end surface of the heat insulating material. Forming a part of the outer tube that covers the outer end surface without being attached, and then the spirally wound partition wall to the outer end extension of the partition wall that has been spirally wound first. Since the outer pipe is formed by sequentially fusing the outer end extension, the inner and outer pipes and partition walls made of soft olefin resin and the partition wall are not fused to the heat insulating material made of foamed polyethylene resin. A heat insulating hose excellent in flexibility can be easily manufactured.

The simplified side view which sectioned a part of heat insulating material. The partially expanded sectional view. Sectional drawing for demonstrating a manufacturing method. Sectional drawing of the state bent.

  Next, a specific embodiment of the present invention will be described with reference to the drawings. In FIGS. 1 and 2, reference numeral 1 denotes an inner tube made of a soft polyethylene resin and having a certain thickness, and the inner peripheral surface of the inner tube extends over the entire length. A hollow spiral ridge 2 made of the same material as the inner tube 1 is continuously formed over the entire length with a constant winding pitch on the outer peripheral surface. A spiral core 2 is internally provided with a flexible core 3 made of an olefin-based resin such as polyethylene or polypropylene having an appropriate elasticity and hardness with a circular cross section.

  4 is a soft polyethylene resin that is integrally connected to the outer peripheral surface of the inner tube 1 by fusing 7 the inner end of the inner tube 1 from the outer peripheral surface of the inner tube 1 to a part of the outer periphery of the hollow spiral ridge 2. A strip-shaped partition wall made of a spiral-shaped partition wall that is wound in the same direction from the inner end toward the outer end at the same pitch as the spiral pitch of the hollow spiral ridge 2, and the outer end portion is made of soft polyethylene. The outer tube 5 having a certain thickness made of resin is integrally connected to the outer tube 5. Then, a rectangular string-shaped heat insulating material 6 made of a polyethylene foam resin is wound in a continuous spiral shape in a spiral space surrounded by the inner and outer tubes 1 and 5 and the spiral partition wall 4. In addition, the inner and outer pipes 1 and 5 are installed in such a manner that the surfaces in contact with the inner and outer pipes 1 and 5 and the partition wall 4 are releasably joined to the inner and outer pipes 1 and 5 and the partition wall 4 without being fused. A heat insulating layer 6 ′ having a predetermined thickness is formed therebetween.

  The manufacturing method of the heat insulating hose configured as described above will be briefly described with reference to FIG. 3. While a strip-shaped material (not shown) made of a soft polyethylene resin in a semi-molten state is extruded from a nozzle (not shown). As is known, the other side portion of the belt-like material portion to be wound next is superposed on the one side portion of the belt-like material portion previously wound on the rotational molding shaft through the flexible core material 3. The inner tube 1 having a constant thickness is formed while forming the hollow spiral ridge 2 in which the core material 3 is housed in the superposed portion by spirally winding while fusing. Further, in the course of forming the inner pipe 1, the rectangular cord-like heat insulating material 6 and the band-like material 40 made of a soft polyethylene resin wider than the semi-molten band-like material are alternately arranged on the inner pipe 1 in the pipe axis direction. The heat insulating layer 6 ′ made of the heat insulating material 6 and the partition wall 4 and the outer tube 5 made of the belt-like material 40 are formed by spirally winding them so as to overlap each other.

  The strip 40 is extruded from a nozzle (not shown) different from the strip forming the inner tube 1 and the hollow spiral ridge 2, and the width of the strip 40 is formed into a vertically long parallelogram. 6 is formed wider than the sum of the side length of the one side inclined surface 6a and the side length of the outer end surface (upper end surface) 6b. A portion covering the one side inclined surface 6a of the heat insulating material 6 by covering without covering the heat insulating material 6 from the one side inclined surface 6a to the outer end surface 6b, that is, divided by one half portion of the belt-like material 40 The outer tube portion 5a is formed by the portion that forms the wall 4 and covers the outer end surface 6b of the heat insulating material 6, that is, the other half portion of the belt-shaped material 40, and one side end of the belt-shaped material 40 is connected to the inner tube. 1 is fused 7 onto the hollow spiral ridge 2 on the winding direction side of the belt-like material 40 from the outer peripheral surface between the adjacent hollow spiral ridges 2, 2 on the other side. Fusing 8 causes the parts to the outer peripheral surface of the outer tube portion continuous to the partition wall 4 formed previously.

  Specifically, when the strip-shaped material 40 and the heat insulating material 6 having the above-mentioned longitudinally long parallelogram shape are spirally wound on the inner tube 1 with the same hitch as the hollow spiral ridge 2, The inner wall 6c of the heat insulating material 6 is placed on the inner tube portion between the partition wall 4 formed first and the partition wall 4 formed next, and the partition wall 4 formed with the heat insulating material 6 first. The other inclined surface 6d inclined in the same direction at substantially the same angle as the inclined surface is joined and received on the inclined surface of the inclined surface in a spiral manner.

  On the other hand, when the belt-like material 40 for forming the partition wall 4 is wound around the inner tube 1 in a single turn, the one side end thereof is wound. Is fused 7 onto the hollow spiral ridge 2 from a part of the outer periphery of the inner tube 1 as described above, and the hollow spiral ridge is formed by contacting and overlapping the hollow spiral ridge 2 on one inclined surface of the heat insulating material 6. The partition wall 4 rising obliquely from the strip 2 is formed, and the other half portion extending from one side half portion of the belt-like material 40 on which the partition wall 4 is formed is formed on the outer end surface 6b of the heat insulating material 6. A part of the outer tube portion 5a is formed by overlapping the outer end surface 6b so as to cover the outer end surface 6b, and protrudes from the outer tube portion 5a toward the outer end of the partition wall 4 previously formed. The outer end portion is fused 8 onto a part of the outer tube portion 5a previously formed together with the partition wall 4.

  In this way, one side end portion (inner end portion) of one side half portion of the strip-shaped material 40 forming the partition wall 4 is integrally fused 7 to the outer peripheral surface of the inner tube 1 and the one side half portion is first moved. The other half portion connected to the one half portion of the heat insulating material 6 is joined to the inclined surface of the heat insulating material 6 wound on the inner tube 1 in a single roll shape, and the upper inclined end of the heat insulating material 6 is joined. The outer end portion of the outer half is formed first, and the outer end portion of the heat insulating material 6 is bent toward the upper end surface of the heat insulating material 6 so as to cover the upper end surface. 8 to form the outer tube 5. At this time, the band-shaped member 40 that forms the partition wall 4 and the outer tube 5 is heated in a semi-molten state in which only both side ends that do not contact the heat insulating material 6 can be fused to the opposing surface. Therefore, it is possible to efficiently manufacture a heat insulating hose having a structure in which the opposing surface of the heat insulating material 6 is releasably bonded to the partition wall 4 and the outer tube 5 formed by the belt-shaped material 40 without being fused.

  When the heat insulating hose thus obtained is bent as shown in FIG. 4, a tensile force acts on the outer peripheral surface portion curved in a convex arc shape, while a compressive force acts on the inner peripheral surface portion curved in a concave arc shape. However, even when the heat insulating layer 6 'on the side on which the compressive force acts is compressed in the length direction of the hose, the outer tube 5 is releasably covered without being fused to the heat insulating layer 6'. The outer tube portion 5a is bent into a mountain shape by the compressive force with the adjacent fused portions 8 and 8 in the outer tube portion 5a covering the outer end surface of the heat insulating material 6 forming the heat insulating layer 6 'as a fulcrum. The heat insulating materials 6 and 6 adjacent to each other through the partition wall 4 can be freely slid along the wall surface of the partition wall 4 and bent greatly.

  The inner and outer pipes 1 and 5 and the partition wall 4 are made of a soft polyethylene resin, but may be made of a polypropylene resin, so long as they are made of a soft olefin resin that can be fused together. Good.

DESCRIPTION OF SYMBOLS 1 Inner pipe | tube 2 Hollow spiral protrusion 3 Core material 4 Partition wall 5 Outer pipe | tube 6 Heat insulating material 7, 8 Fusion part

Claims (2)

  By spirally winding a heat insulating material made of foamed polyethylene resin at a constant pitch on an outer peripheral surface of an inner tube made of a soft olefin resin in which a core material is spirally wound on an outer peripheral surface through a partition wall made of the same material In the elastic hose which forms the heat insulation layer and coats this heat insulation layer with the outer tube made of the same material as the inner tube, the inner and outer ends of the partition wall made of the soft olefin resin are respectively made of the soft olefin type. While the outer pipe and the inner pipe made of resin are integrally connected to the inner pipe, the heat insulating material made of the foamed polyethylene resin is not fused to the inner and outer pipes made of the soft olefin resin and the partition wall. A heat-insulating hose characterized by being releasably joined.   The inner end portion of the partition wall is integrally fused to the outer peripheral surface of the inner tube, and the outer end surface is coated by the outer end extension portion of the partition wall without being fused to the outer end surface of the heat insulating material. The outer tube is formed by forming a part of the tube and sequentially fusing the outer end extension of the partition wall spirally wound next to the outer end extension of the partition wall spirally wound first. The heat insulating hose according to claim 1, wherein:

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