JP2016138624A - Flexible heat insulation hose - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flexible heat insulation hose showing superior heat insulation characteristic and flexible characteristic and that can be efficiently manufactured.SOLUTION: A flexible heat insulation hose 1 is constituted in such a way that a flexible inner pipe 2 keeping a shape retention characteristic from inside to outside of the hose, a first heat insulation layer 3, a sliding layer 4, a second heat insulation layer 5, and a flexible outer pipe 6 are integrally laminated in this order. Each of the elements is constituted in such a way that tape-like or string-like material is wound at a predetermined pitch P. The heat insulation layers 3, 5 are formed by string-like fibrous assembly. The sliding layer 4 is formed by helically winding a tape-like film material 41 with their both side edges being overlapped to each other and the overlapping both side edges of the film material 41 are not adhered to each other. An inner side of the outer pipe 6 is formed with a helical hollow space, the string-like fibrous assembly 66 is arranged inside the hollow space to become a third heat insulation layer 61.SELECTED DRAWING: Figure 2

Description

The present invention relates to a heat insulating hose having flexibility, and more particularly to a flexible heat insulating hose having a plurality of heat insulating layers.

The flexible heat insulating hose is preferably used for a duct hose used in a residential air conditioning system. When the heat insulating hose has flexibility, the duct hose can be bent and piped at an arbitrary position, and the duct hose can be efficiently piped even in a narrow pipe space. The flexible heat insulating hose includes a heat insulating layer, and the heat insulating layer is usually made of a foamed resin or the like. In order to improve heat insulation, it is known that it is particularly preferable that the heat insulation layer is formed of a foamed resin having a closed cell structure, and such a duct hose has already been put into practical use.

For example, Patent Document 1 includes a sound absorbing layer made of a foamed resin having an open cell structure and a heat insulating layer formed by spirally winding a foamed resin tape having a closed cell structure, and both side edges of the foamed resin tape constituting the heat insulating layer. A sound-absorbing and heat-insulating hose is disclosed in which parts are heat-bonded with a resin tape and connected and integrated. The sound-absorbing heat insulating hose can be reduced in weight and cost while maintaining heat insulating properties.

JP 2004-170073 A

Especially in residential air conditioning systems for cold regions, the temperature difference between the inside and outside of the duct hose tends to be large, so it is necessary to further increase the level of heat insulation to prevent condensation on the duct hose. It has become. However, there is a limit to improving the heat insulating performance of the heat insulating material itself applicable to the flexible hose.

In order to improve the heat insulating property of the heat insulating hose, the inventors tried to increase the thickness of the heat insulating layer by increasing the thickness of the heat insulating layer in the conventional heat insulating hose. It was found that the outer diameter had to be increased, and the flexibility of the heat-insulating hose was impaired, and a rigid hose was likely to be formed. When the flexibility of the hose is impaired, the hose is crushed at the portion where the hose is bent, or the heat insulating material is crushed at the portion where the hose is bent, and the heat insulating property of the portion is impaired.

The objective of this invention is providing the flexible heat insulation hose excellent in heat insulation and flexibility. Another object of the present invention is to provide a flexible heat insulating hose that can be efficiently manufactured.

As a result of intensive studies, the inventor adopted a string-like fiber assembly as a heat insulating material constituting the heat insulating layer, provided a sliding layer having a specific structure between the heat insulating layers, and further, an outer tube having a specific structure. In combination, it has been found that the flexibility and heat insulation of the flexible heat insulation duct can be achieved, and the present invention has been completed.

The present invention provides a flexible inner tube having shape retention, a first heat insulating layer, a sliding layer, a second heat insulating layer, and a flexible outer tube from the inside to the outside of the hose. The tube is a flexible heat insulating hose laminated and integrated in this order, and the inner tube comprises an inner tube wall formed by winding a flexible tape-shaped material spirally at a predetermined pitch. , Having a helical reinforcing body wound at the pitch and integrated with the inner tube wall, wherein the first heat insulating layer contacts the first string-like fiber assembly, and both side edges thereof are in contact with each other. The sliding layer is formed by spirally winding at the pitch, and the sliding layer is a tape-shaped film material that is wider than the pitch, so that both side edges overlap each other. It is formed by spirally winding at the pitch, and the heavy The matching side edges are non-adhering to each other, and the second heat insulating layer is formed by spirally winding the second string-like fiber assembly at the pitch so that the side edges are in contact with each other. The outer tube is composed of an outer tube main body and a third heat insulating layer, and the outer tube main body has a film-like resin material formed in a tape shape wider than the pitch at the pitch. It is formed by winding in a spiral shape, and has an outer tube inner wall, an outer tube outer wall, and an outer tube connecting wall, and the outer tube inner wall and outer tube outer wall are separated by a predetermined distance. The outer tube inner wall portion and the outer tube outer wall portion are connected to each other by the outer tube connecting wall portion extending in the radial direction of the hose. Spiral hollow space at the pitch by the outer pipe wall and the outer pipe connecting wall A third string-like fiber assembly is spirally arranged at the pitch so as to fill the spiral hollow space formed inside the outer tube main body, and a third heat insulating layer is formed inside the outer tube. It is the flexible heat insulation hose currently formed (1st invention).

In the first invention, it is preferable that the sliding layer is not bonded to the first heat insulating layer and is not bonded to the second heat insulating layer (second invention). Furthermore, in the second invention, it is preferable that the outer tube main body and the third string-like fiber aggregate are not bonded (third invention). Furthermore, in the third invention, it is preferable that the outer tube inner wall portion mainly composed of the outer tube is not bonded to the second heat insulating layer (fourth invention). Further, in the fourth invention, the position in the hose axial direction of the portion where both side edges of the first string-like fiber assembly are in contact with each other, and the portion where both side edges of the second string-like fiber assembly are in contact with each other It is preferable that the positions in the hose axial direction are shifted from each other by substantially half of the pitch (fifth invention).

According to the flexible heat insulating hose of the present invention (first invention), both the flexibility and the heat insulating property of the hose can be achieved. Moreover, the flexible heat insulation hose of this invention is comprised when all the materials used as the structural member of a hose are helically wound by the same pitch, and its manufacturing efficiency is high.

If it carries out like 2nd invention thru | or 4th invention, the flexibility of a hose will be improved more. Moreover, if it is made like 5th invention, the heat insulation of a hose will be improved more.

It is a figure which shows the structure of the hose of 1st Embodiment. It is a figure which shows the cross-section of the hose wall of the hose of 1st Embodiment. It is a figure which shows the manufacturing method of the hose of 1st Embodiment. It is a figure which shows the structure of the hose of 2nd Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings, taking as an example a flexible heat insulating hose used in a building air conditioning system. The present invention is not limited to the individual embodiments shown below, and can be carried out by changing the form. The flexible heat insulating hose may be used for other purposes.

FIG. 1 shows the structure of the flexible heat insulating hose 1 of the first embodiment. In FIG. 2, the cross-sectional structure of the hose wall of the flexible heat insulation hose 1 is shown typically. In FIG. 2, the upper side of the figure is the outside of the hose, and the lower side of the figure is the inside of the hose. The flexible heat insulating hose 1 is a hollow cylindrical hose through which air for air conditioning flows. The flexible heat-insulating hose 1 has flexibility, and is piped in a state where the hose is appropriately bent when it is piped on the ceiling or the like, and becomes a part of the air duct of the air conditioning system. Moreover, the flexible heat insulation hose 1 has a heat insulation layer. In the present embodiment, three heat insulating layers of the first heat insulating layer 3, the second heat insulating layer 5, and the third heat insulating layer 61 are provided.

The structure of the flexible heat insulating hose 1 will be described in detail.
The hose wall of the flexible heat insulating hose 1 has a laminated structure, and the inner tube 2 having shape retention, the first heat insulating layer 3, and the sliding layer 4 are formed from the inside to the outside of the hose. The second heat insulating layer 5 and the outer tube 6 are laminated and integrated in this order. Each layer is flexible.

The inner tube 2 has an inner tube wall 21 and a helical reinforcing body 22.
The inner tube wall 21 is configured such that a flexible tape-shaped material T1 is spirally wound at a predetermined pitch P and both side edges of the tape-shaped material T1 are joined. As the tape-shaped material T1, non-woven fabric, woven fabric, synthetic resin, rubber tape or film can be used. The helical reinforcement body 22 is a member made of a metal wire, a synthetic resin, or the like, and retains the cylindrical shape of the inner tube 2. The helical reinforcement body 22 is wound at a pitch P and integrated with the inner tube wall 21.
In the present embodiment, the inner tube wall 21 is composed of a nonwoven fabric made of polypropylene fiber, and the spiral reinforcement 22 made of polypropylene resin is integrated with the inner tube wall 21 by heat fusion to form the inner tube 2. ing.

The first heat insulating layer 3 is provided adjacent to the outside of the inner tube 2. The 1st heat insulation layer 3 is formed by winding the 1st fiber assembly 31 formed in the shape of a string helically with the pitch P so that the both-sides edges may mutually contact. The string-like fiber assembly 31 may be made of cotton made of natural fiber or synthetic fiber, or may be made of non-woven fabric made of synthetic fiber. The string-like fiber aggregate 31 has flexibility, and the first heat insulating layer 3 also has flexibility.
In order to enhance the heat insulation effect, it is preferable to select a bulky fiber assembly. Moreover, it is preferable that the first string-like fiber aggregate 31 is spirally wound without a gap so that no gap is generated in the first heat insulating layer 3. In this embodiment, the 1st heat insulation layer 3 and the string-like fiber aggregate 31 are comprised with the nonwoven fabric made from a polyester fiber.

In addition, since the string-like fiber aggregate which comprises the 1st heat insulation layer 3 has a silencing effect | action, this can be utilized for the silencing of a hose. When it is desired to improve the silencer of the hose, it is preferable to employ a material having air permeability for the inner tube wall 21 of the inner tube 2.

The sliding layer 4 is provided adjacent to the outside of the first heat insulating layer 3. The sliding layer 4 is formed by winding a tape-shaped film material 41 in a spiral shape at a pitch P so that both side edges thereof overlap each other. The width of the tape-shaped film material 41 is wider than the pitch P of the inner tube or the first heat insulating layer. Moreover, in the sliding layer 4, the both-sides edge part which the tape-shaped film material 41 overlaps is mutually non-adhesive, is made slidable, and the width | variety of the overlapping part of the tape-shaped film material 41 changes. The sliding layer 4 can be expanded and contracted in the hose axial direction. As the material of the tape-like film material 41, a synthetic resin film material such as a polyethylene resin film or a polypropylene resin film can be used.

The sliding layer 4 prevents the movement of air in the direction penetrating the hose wall of the hose 1 and enhances the heat insulation of the hose. Moreover, the sliding layer 4 can expand and contract and does not hinder the flexibility of the hose.
The width of the tape-like film material 41 constituting the sliding layer 4 is not less than 1.5 times the pitch P so that a gap does not occur in the sliding layer 4 even if the hose wall expands and contracts as the hose 1 is bent. More preferably, it is preferably set to 2 times or more. From the viewpoint of improving the heat insulation of the hose, it is preferable to employ a non-breathable film material as the tape-like film material 41 constituting the sliding layer 4.
In this embodiment, a polyethylene resin film having a width twice as large as the pitch P is used as the tape-like film material 41, and the sliding layer 4 is formed by being wound in a spiral shape with the pitch P.

From the viewpoint of increasing the flexibility of the hose 1, the sliding layer 4 is preferably not bonded to the first heat insulating layer 3. From the same viewpoint, the sliding layer 4 is preferably not bonded to the second heat insulating layer 5. If they are not bonded, they can slide freely, and when the hose wall is expanded or contracted, the deformation of the string-like fiber aggregates constituting the first heat insulating layer 3 and the second heat insulating layer 5 is small. Because it becomes.

The second heat insulating layer 5 is provided adjacent to the outside of the sliding layer 4. The second heat insulating layer 5 is formed by winding the second string-like fiber aggregate 51 in a spiral shape with a pitch P such that both side edges thereof are in contact with each other. The second string-like fiber aggregate 51 may be made of cotton made of natural fiber or synthetic fiber, or may be made of non-woven fabric made of synthetic fiber. The string-like fiber aggregate 51 has flexibility, and the second heat insulating layer 5 also has flexibility.
It is preferable to select a bulky fiber assembly. Further, it is preferable that the second string-like fiber aggregate 51 is spirally wound without a gap so that no gap is generated in the second heat insulating layer 5. In this embodiment, the 2nd heat insulation layer 5 and the 2nd string-like fiber aggregate 51 are comprised with the nonwoven fabric made from a polyester fiber.

The flexible outer tube 6 is provided adjacent to the outside of the second heat insulating layer 5.
The outer tube 6 includes an outer tube main body 62 and a third heat insulating layer 61. The outer tube main body 62 and the third heat insulating layer 61 have flexibility. The outer pipe main body 62 has airtightness. The outer tube main body 62 has a double tube structure, and a spiral hollow space with a pitch P is formed between the double tubes, and a string-like fiber assembly is arranged in the hollow spiral space. Thus, the third heat insulating layer 61 is formed inside the outer tube main body 62.

The configuration of the outer pipe main body 62 will be described. The outer tube main body 62 includes an outer tube inner wall 63, an outer tube outer wall 64, and an outer tube connection wall 65. The outer tube inner wall 63 is formed in a hollow cylindrical shape and has flexibility. An outer tube outer wall portion 64 is formed in a hollow cylindrical shape at a predetermined interval on the outer side of the outer tube inner wall portion 63. The outer tube outer wall portion 64 is also flexible. That is, the outer tube inner wall 63 and the outer tube outer wall 64 provide a space between the two tube walls, and have a double tube structure with a predetermined interval. The outer tube connecting wall 65 is provided so as to extend in the hose radial direction so as to connect the outer tube inner wall 63 and the outer tube outer wall 64. The outer pipe connecting wall portion 65 is formed in a spiral shape with a pitch P. A helical hollow space having a pitch P is formed inside the outer tube main body by the outer tube inner wall 63, the outer tube outer wall 64, and the outer tube connecting wall 65.

The outer tube main body 62 can be made of, for example, a soft vinyl chloride resin. The outer tube main body 62 is, for example, a film-like resin material 67 formed in a tape shape wider than the pitch P (for example, about three times as wide as the pitch P), as will be described in detail in a manufacturing method described later. Can be formed by spirally winding at a pitch P.

The third heat insulating layer 61 is constituted by a third string-like fiber assembly 66. The third string-like fiber aggregate 66 is arranged so as to fill a spiral hollow space formed with a pitch P inside the outer tube main body 62.

The third string-like fiber assembly 66 may be made of cotton made of natural fibers or synthetic fibers, or may be made of nonwoven fabric made of synthetic fibers. The string-like fiber assembly 66 has flexibility, and the third heat insulating layer 61 also has flexibility.
It is preferable to select a bulky fiber assembly. Further, the third string-like fiber assembly 66 is arranged so as to be filled in the spiral hollow space so that no gap is formed between the outer main tube 62 and the third heat insulating layer 61. It is preferable to prevent the occurrence of. In this embodiment, the 3rd heat insulation layer 61 and the 3rd string-like fiber assembly 66 are comprised with the nonwoven fabric made from a polyester fiber.

From the viewpoint of increasing the flexibility of the hose 1, it is preferable that the third heat insulating layer (third string-like fiber assembly 66) and the outer tube main body 62 are not bonded to each other in the outer tube 6. This is because if they are not bonded, they can slide freely with each other, and the deformation of the string-like fiber assembly 66 constituting the third heat insulating layer 61 is reduced when the hose wall is expanded and contracted.

Further, from the viewpoint of increasing the flexibility of the hose 1, the outer tube inner wall 63 of the outer tube 6 is preferably not bonded to the second heat insulating layer 5. If they are not bonded, they can slide freely with each other, and when the hose wall is expanded and contracted, the deformation of the string-like fiber aggregate 51 constituting the second heat insulating layer 5 becomes small. is there.

The first heat insulating layer 3, the second heat insulating layer 5, and the third heat insulating layer 61 are all configured by spirally winding a fiber assembly formed in a string shape. In these heat insulating layers, It is preferable that the positions in the hose axial direction of the portions where the both side edge portions of the string-like fiber assembly are brought together are different positions between the heat insulating layers adjacent to each other. In this way, even when a deformation that causes a gap in the portion where both side edges of the string-like fiber assembly are brought together in a certain heat insulating layer is applied to the hose wall, This is because a gap can be prevented from occurring in the portion, and a decrease in heat insulation of the hose can be prevented.

More preferably, as shown in the present embodiment, the position in the hose axial direction of the portion where both side edges of the first string-like fiber aggregate 31 constituting the first heat insulation layer 3 are in contact with each other, and the second heat insulation layer The positions in the hose axial direction of the portions where both side edges of the second string-like fiber aggregate 51 constituting 5 are in contact with each other are shifted from each other in the hose axial direction by substantially half of the pitch P. The Similarly, in the relationship between the second heat insulating layer 5 and the third heat insulating layer 61, as shown in the present embodiment, the hose axial direction is configured to be shifted in the hose axial direction by approximately half of the pitch P. It is preferable.

The example of the manufacturing method of the flexible heat insulation hose 1 is demonstrated. FIG. 3 is a schematic view of a method for manufacturing the flexible heat insulating hose 1. The flexible heat insulating hose 1 is manufactured by a hose forming method called a spiral forming method. In the spiral molding method, the hose material is sequentially supplied in the form of a tape or string to the well-known hose molding shaft SFT that can be spirally fed out while winding the hose material in a spiral shape. A hose is continuously formed by winding and spiraling at a predetermined pitch P on the shaft.

The hose forming shaft SFT of the hose forming machine M has an outer diameter corresponding to the inner diameter of the flexible heat insulating hose 1 and can rotate and feed the supplied hose material in a helical shape with a pitch P.

When a flexible tape-like material (polypropylene nonwoven fabric) T1 is supplied to the hose forming shaft SFT, the inner tube wall 21 is formed by being wound in a spiral shape with a pitch P.

When a string-shaped thermoplastic synthetic resin S1 (polypropylene resin string) extruded in a semi-molten state is supplied to the outside of the inner tube wall 21, a helical reinforcement 22 is formed. The spiral reinforcing body 22 and the inner tube wall 21 are heat-welded and integrated to form the inner tube 2.

A first string-like fiber assembly 31 is supplied to the outside of the formed inner tube 2 and wound in a spiral shape to form the first heat insulating layer 3.

A tape 41 made of a resin film material (polyethylene film material) having a width approximately twice as large as the pitch P is supplied to the outside of the formed first heat insulating layer 3. The tape-shaped film material 41 is spirally wound at a pitch P and wound into a cylindrical shape so that both side edges of the tape overlap each other, thereby forming the sliding layer 4.

A second string-like fiber assembly 51 is supplied to the outside of the formed sliding layer 4 and wound in a spiral to form the second heat insulating layer 5.

A tape-like film-like resin material 67 and a third string-like fiber assembly 66 are supplied to the outside of the formed second heat insulation layer 5 and both are spirally wound to form the outer tube 6. .
The tape-shaped film-shaped resin material 67 is extruded into a tape shape having a width about three times the pitch P in a semi-molten state and supplied to the outside of the second heat insulating layer 5. The tape-like film-like resin material 67 is wound in a spiral shape with a pitch P so that both side edges overlap each other, and the subsequent tape is wound on the portion of the tape wound in advance.
The third string-like fiber aggregate 66 is supplied so as to be sandwiched between a portion of the tape-like film-shaped resin material 67 that is wound in advance and a portion that is subsequently wound. Then, an outer tube main body 62 having an outer tube inner wall portion 63, an outer tube outer wall portion 64, and an outer tube connecting wall portion 65 is formed by the tape-like film-shaped resin material 67, and a third heat insulating layer 61 is formed therein. As a result, the outer tube 6 is formed.

The above process is continuously performed on the hose forming shaft SFT, and the flexible heat insulating hose 1 is continuously formed.

The operation and effect of the flexible heat insulating hose 1 will be described.
In the flexible heat-insulating hose 1, a string-like fiber assembly is adopted as a constituent material of the heat-insulating layers 3, 5, 61, the overlapping portion of the sliding layer 4 is not bonded, and the spiral inner Since the heat insulating layer 61 is integrated with the outer pipe main body 62 having a space, both the flexibility and the heat insulating property of the hose can be achieved. That is, the flexible heat-insulating hose 1 has good flexibility despite having three heat-insulating layers.

In particular, by combining a non-adhesive sliding layer and a string-like fiber assembly, a laminated heat insulating layer rich in flexibility can be configured. Since the overlapping portion of the sliding layer 4 is non-adhered, the sliding layer is easily expanded and contracted in the hose axial direction, and the flexibility of the hose wall is improved. Furthermore, since the overlapping portion of the sliding layer 4 is non-adhered, when the hose 1 is bent, the sliding layer 4 crushes the first heat insulating layer 3 at a portion corresponding to the outer peripheral side of the bending. It is possible to prevent the deterioration of heat insulation.

Further, the outer tube 6 is configured so that the string-like fiber aggregate 66 is arranged in the spiral inner space to be the third heat insulation layer 61, and the string-like fiber aggregate 66 constituting the third heat insulation layer. Since the position of is generally defined in the hose axial direction, even if the hose wall repeatedly expands and contracts, the fiber assembly constituting the third heat insulating layer moves in the hose axial direction, and the third heat insulating layer 61 There will be no large gaps. Therefore, a more reliable heat insulating effect can be obtained even at the bent portion of the hose.

When the sliding layer 4 is not bonded to the first heat insulating layer 3 and is not bonded to the second heat insulating layer 5, these layers can slide in the hose axial direction with respect to each other. This contributes to improving the flexibility. Further, when the outer tube main body 62 and the third string-like fiber aggregate 66 are not bonded, it contributes to the improvement of the flexibility of the hose. In addition, when the outer tube inner wall 63 of the outer tube main body 62 is not bonded to the second heat insulating layer 5, they can slide in the hose axial direction, thereby improving the flexibility of the hose. Contribute.

Moreover, in the flexible heat-insulating hose 1, all the constituent materials constituting the hose are wound at the same pitch P to form a heat-insulating hose. The hose can be manufactured efficiently continuously.

The present invention is not limited to the above embodiment, and can be implemented with various modifications. Other embodiments of the present invention will be described below. However, in the following description, portions different from the above embodiment will be mainly described, and detailed descriptions of the same portions will be omitted. Further, the embodiments described below can be implemented by combining some of them or replacing some of them.

In the flexible heat insulating hose 1 of the above embodiment, each of the heat insulating layers 3, 5, 61 is an example of one heat insulating layer, but these heat insulating layers are heat insulating layers including a plurality of layers. May be. For example, as in the flexible heat-insulating hose 8 of the second embodiment shown in FIG. 4, a two-layer structure in which a portion of the second heat-insulating layer 85 is wound to overlap two string-like fiber aggregates. It is good also as a heat insulation layer. When these heat insulation layers are heat insulation layers comprising a plurality of layers, the portions where the side edges of the string-like fiber aggregates abut each other like the second heat insulation layer 85 shown in FIG. It is preferable that the positions are different from each other in the axial direction from the viewpoint of improving heat insulation. Moreover, it is preferable to make the 2nd heat insulation layer into the heat insulation layer comprised by several layers like the flexible heat insulation hose 8 of 2nd Embodiment from a viewpoint of making heat insulation and flexibility compatible.

The flexible heat-insulating hoses 1 and 8 include a flexible inner tube 2 having shape retention, a first heat-insulating layer 3, a sliding layer 4, and a second material from the inside to the outside of the hose. The heat insulating layers 5 and 85 and the flexible outer tube 6 are flexible heat insulating hoses in which the layers are integrated in this order, but other layers such as a protective layer or the like are formed outside the outer tube 6. You may provide a coating layer.

The said flexible heat insulation hose can be used for the heat insulation duct for an air conditioning, and its flexibility is favorable and its industrial utility value is high.

DESCRIPTION OF SYMBOLS 1 Flexible heat insulation hose 2 Inner pipe 21 Inner pipe wall 22 Spiral reinforcement 3 First heat insulation layer 4 Sliding layer 5 Second heat insulation layer 6 Outer pipe 61 Third heat insulation layer 62 Outer pipe main body 63 Outer pipe inner wall 64 Outer tube outer wall portion 65 Outer tube connecting wall portion SFT Hose forming shafts 31, 41, 66 String-like fiber assembly 8 Flexible heat insulating hose 85 Second heat insulating layer

The present invention provides a flexible inner tube having shape retention, a first heat insulating layer, a sliding layer, a second heat insulating layer, and a flexible outer tube from the inside to the outside of the hose. and the tube is a flexible thermal insulation hose integrally laminated in this order, wherein the inner tube, the inner flexible tape-like material is constituted by wound spirally at a predetermined pitch A pipe wall and a spiral reinforcing body wound at the pitch and integrated with the inner pipe wall, and the first heat insulating layer is formed of a first string-like fiber aggregate. , the first string-like fiber aggregate, its being wound spirally in the pitch as both side edge portions are in contact with each other, wherein the sliding layer is tape-shaped, wherein is wider than the pitch film It is formed of a material, such tape-like film material overlapping the side edge portions to each other, the pitch Together are wound in a spiral in, both side edges overlapping tape-like film materials is a non-bonded to each other, the second insulation layer is formed by the second string-like fiber aggregate, the second string-like fiber aggregate is wound helically the pitch so that the both side edge portions are in contact with each other, the outer tube is constituted by the outer tube main body and the third insulation layer, the outer tubes principal, said have been formed by the film-like resin material formed into a wide tape-like than the pitch, tape-like film-like resin material is wound spirally in the pitch, and the outer tube The main body has an outer tube inner wall portion, an outer tube outer wall portion, and an outer tube connecting wall portion, and the outer tube inner wall portion and the outer tube outer wall portion are arranged to form a double tube with a predetermined interval therebetween. In addition, on the outer pipe connecting wall that extends in the hose radial direction The inner wall portion of the outer tube and the outer wall portion of the outer tube are connected to each other, and the spiral hollow space at the pitch is mainly formed by the outer tube inner wall portion, the outer tube outer wall portion, and the outer tube connecting wall portion. of which is formed therein so as to fill the helical hollow space, the third string-like fiber aggregate is wound helically arranged at the pitch, forming a third insulation layer on the inside of the outer tube (1st invention).

Claims (5)

From the inside to the outside of the hose, a flexible inner tube having shape retention, a first heat insulating layer, a sliding layer, a second heat insulating layer, and a flexible outer tube, A flexible heat insulating hose laminated and integrated in this order,
The inner tube includes an inner tube wall formed by winding a flexible tape-shaped material in a spiral shape at a predetermined pitch, and a helical reinforcement body wound at the pitch and integrated with the inner tube wall. Have
The first heat insulating layer is formed by winding the first string-like fiber aggregate in a spiral shape at the pitch so that both side edges thereof are in contact with each other,
The sliding layer is formed by winding a tape-shaped film material wider than the pitch in a spiral manner at the pitch so that both side edges overlap each other, and the tape-shaped film material The overlapping side edges are non-adhesive to each other,
The second heat-insulating layer is formed by winding the second string-like fiber assembly in a spiral manner at the pitch so that both side edges thereof are in contact with each other,
The outer pipe is composed of an outer pipe main body and a third heat insulating layer,
The outer tube main body is formed by winding a film-like resin material formed in a tape shape wider than the pitch in a spiral shape with the pitch, and an outer tube inner wall portion and an outer tube outer wall portion, An outer pipe connecting wall portion, and the outer pipe inner wall portion and the outer pipe outer wall portion are arranged to form a double pipe at a predetermined interval, and extend in the hose radial direction. The inner wall portion of the outer tube and the outer wall portion of the outer tube are connected with each other, and the spiral hollow space at the pitch is mainly formed by the outer tube inner wall portion, the outer tube outer wall portion, and the outer tube connecting wall portion. Formed inside
A flexible heat insulating hose in which a third string-like fiber assembly is spirally arranged at the pitch so as to fill the spiral hollow space, and a third heat insulating layer is formed inside the outer tube. . The flexible heat insulating hose according to claim 1, wherein the sliding layer is not bonded to the first heat insulating layer and is not bonded to the second heat insulating layer. The flexible heat-insulating hose according to claim 2, wherein the outer tube main body and the third string-like fiber aggregate are not bonded to each other. The flexible heat insulating hose according to claim 3, wherein the outer tube inner wall portion mainly composed of the outer tube is not bonded to the second heat insulating layer. A position in the hose axial direction of a portion where both side edges of the first string-like fiber assembly are in contact with each other and a position in a hose axial direction of a portion where both side edges of the second string-like fiber assembly are in contact with each other. The flexible heat insulating hose according to claim 4, which is shifted from each other by approximately half of the pitch.

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