Insulated hose and method of manufacturing same

Abstract

To provide a heat insulation hose an outer surface of which is hard to be bedewed.SOLUTION: An inner layer 4 on which five coating layers 9a are laminated is formed on an inner surface 2, an inner heat insulation layer 7a coated with the coating layer 9a is formed on the inner layer 4, an outer heat insulation layer 8a coated with the coating layer 9a is laminated on the inner heat insulation layer 7a, and the outer heat insulation layer 8a is coated with an outer layer 5 on which two coating layers 9a are laminated. Accordingly, movement of water content due to dew condensation to the outer heat insulation layer 8a is suppressed even when the dew condensation occurs on the inner heat insulation layer 7a, and cold air generated from cold water flowing inside of a heat insulation hose is hard to transfer, thus an outer surface 3 is hard to be bedewed.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a thermally insulated hose, such as a drain hose, for use in an air conditioner, and a method for manufacturing the same. [Background technology]

[0002] Conventionally, as this type of insulated hose, for example, the one shown in Fig. 10 has been known (Patent Document 1). Fig. 10 is a cross-sectional view showing the conventional insulated hose cut along its axis. A conventional insulated hose 100 has an inner wall 101 formed of vinyl tape and an outer wall 102 also formed of vinyl tape, with insulation material 103 provided between the inner wall 101 and the outer wall 102. The insulation material 103 is composed of an inner layer 104 and an outer layer 105. A reinforcing wire 109 is interposed between the inner layer 104 and the inner wall 101. A seam 106 is formed between the inner layers 104, and a seam 107 is formed between the outer layers 105. Furthermore, a seam 108 is formed between the inner layer 104 and the outer layer 105. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 7-305796 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, when the insulated hose 100 is used as a drain hose for an air conditioner, when drain water (cold water) passes through the inside of the insulated hose 100 and the temperature of the inner wall 101 drops, condensation occurs on the inner layer 104. However, because the conventional insulated hose 100 described above has joints 106-108, when moisture due to condensation on the inner layer 104 or cold air generated from cold water flowing inside the insulated hose 100 passes through each of the joints 106-108 and reaches the outer wall 102, condensation occurs on the outer surface of the outer wall 102, and the moisture due to the condensation may fall onto the ceiling or floor. In particular, when the insulated hose 100 is bent when it is attached to an air conditioning unit, each joint widens and a gap (air layer) is formed, and moisture or cold air reaches the outer wall 102 from the inner wall 104, making it easy for condensation to occur on the outer surface. In other words, the conventional insulated hose 100 described above has a problem in that condensation easily occurs on the outer surface.

[0005] The present invention has been made to solve the above-mentioned problems, and has an object to provide a thermally insulated hose whose outer surface is less susceptible to condensation. [Means for solving the problem]

[0006] (First feature) In order to achieve the above-mentioned object, the present invention provides a strip-shaped insulation material formed of a synthetic resin and a strip-shaped covering material formed of a synthetic resin. (9) A flexible insulated hose (1: FIG. 1) formed by spirally winding a Between the inner surface (2) and the outer surface (3) of the insulated hose (1), an inner insulation layer (7a) made of a heat insulating material and an outer insulation layer (8a) laminated on the outside of the inner insulation layer (7a) are formed, The inner insulating layers (7a) are arranged adjacent to each other along the axis (G) of the insulated hose (1), The outer insulating layers (8a) are arranged adjacent to each other along the axis (G) of the insulating hose (1), When the insulated hose (1) is cut along the direction of the axis (G), the circumferential surface of the inner insulation layer (7a) and the circumferential surface of the outer insulation layer (8a) are each covered with a covering material (9) and have an independent structure, The mutually adjacent inner insulation layers (7a) are not in contact with each other, and the mutually adjacent outer insulation layers (8a) are not in contact with each other, and further, the inner insulation layers (7a) and the outer insulation layers (8a) are not in contact with each other, The first feature of the covering material (9) is that it is one continuous covering material.

[0009] (Part 2 Features of In order to achieve the above-mentioned object, the present invention provides the above-mentioned 1 of In terms of features, The outer side of the outermost heat insulating layer (8a) is covered with an outer layer (5) in which a covering layer (9a: FIG. 3) made of a covering material (9) is laminated in multiple layers. 2 The characteristics of this system are as follows.

[0010] (Part 3 Features of In order to achieve the above-mentioned object, the present invention provides the above-mentioned first to third or the second In terms of features, The inner layer (4) is formed by laminating a plurality of coating layers (9a: FIG. 3) made of a coating material (9) on the inner side of the innermost insulating layer (7a). 3 The characteristics of this system are as follows.

[0011] (Part 4 Features of In order to achieve the above-mentioned object, the present invention provides the above-mentioned first to third 3 In any one of the above features, The first point is that a linear reinforcing material (6: FIG. 3) made of synthetic resin is interposed between the innermost insulating layer (7a) and the covering material (9) arranged inside the insulating layer. 4 The characteristics of this system are as follows.

[0012] (Part 5 Features of In order to achieve the above-mentioned object, the present invention provides a coating material supplying device (30: FIG. 9) for supplying a continuous coating material (9) made of synthetic resin, a reinforcing material supplying device (40) for supplying linear reinforcing material (6), a first insulating material supplying device (50) for supplying a strip-shaped first insulating material (7) made of synthetic resin, and a second insulating material supplying device (60) for supplying a strip-shaped second insulating material (8) made of synthetic resin, which are arranged around a rotating shaft member (20); The coating material (9) supplied from the coating material supply device (30) is wound around the circumferential surface of the rotating shaft member (20) so as to overlap in a spiral shape, A reinforcing material (6) supplied from a reinforcing material supply device (40) and a first insulating material (7) supplied from a first insulating material supply device (50) are spirally wound around the circumferential surface of the insulating material (9) wound around the circumferential surface of the shaft member (20) in a state where the reinforcing material (6) is sandwiched between the insulating material (9) wound around the circumferential surface of the shaft member (20) and the insulating material (9) to be wound around the circumferential surface of the shaft member (20) such that the reinforcing material (6) is interposed between the insulating material (9) wound around the circumferential surface of the shaft member (20) and the first insulating material (7); The second insulating material (8) supplied from the second insulating material supply device (60) is spirally wound around the circumferential surface of the first insulating material (7) wound around the circumferential surface of the shaft member (20) and covered with the covering material (9) in a state where the second insulating material (8) is sandwiched between the first insulating material (7) wound around the circumferential surface of the shaft member (20) and covered with the covering material (9) and the covering material (9) to be wound around the circumferential surface of the shaft member (20). 5 The characteristics of this system are as follows.

[0014] (Part 6 Features of In order to achieve the above-mentioned object, the present invention provides the above-mentioned 6 In the characteristics of The width (w1) of each of the first insulating material (7) and the second insulating material (8) is the same, When the direction in which the formation of the insulated hose (1) proceeds is defined as the forward direction, the position at which the first insulating material (7) is wound is located behind the position at which the second insulating material (8) is wound, and the position at which the first insulating material (7) is wound and the position at which the second insulating material (8) is wound are spaced apart by a distance (1.5w1) longer than the above-mentioned width (w1). 6 The characteristics of this system are as follows.

[0015] (Part 7 Features of In order to achieve the above-mentioned object, the present invention provides the above-mentioned 5 Or 6 In the characteristics of The first step is to use a softened coating material (9) so that the coating materials (9) can be welded together. 7 The characteristics of this system are as follows.

[0016] (Part8 Features of In order to achieve the above-mentioned object, the present invention provides the above-mentioned 5 or 7 In any one of the characteristics The covering material (9) is wound around the circumferential surface of the shaft member (20) a number of times so as to overlap in a spiral shape, thereby forming an inner layer (4) in which a number of covering layers (9a) made of the covering material (9) are laminated, and a reinforcing material (6) and a first insulating material (7) are wound on the inner layer (4). 8 The characteristics of this system are as follows.

[0017] (Part 9 Features of In order to achieve the above-mentioned object, the present invention provides the above-mentioned 8 In the characteristics of The reinforcing material (6) is made of synthetic resin. The first step is to use a reinforcing material (6) that is softened so that it can be welded to the inner layer (4). 9 The characteristics of this system are as follows.

[0018] (Part 10 Features of In order to achieve the above-mentioned object, the present invention provides the above-mentioned 5 or 9 In any one of the characteristics When the second insulating material (8) is wound in a spiral shape around the peripheral surface of the first insulating material (7) covered with the covering material (9), the covering material (9) is wound multiple times so as to overlap in a spiral shape around the peripheral surface of the second insulating material (8), thereby forming an outer layer (5) in which multiple covering layers (9a) made of the covering material (9) are laminated on the outside of the second insulating material (8). 10 The characteristics of this system are as follows.

[0019] The reference characters and the numbers in the drawings in parentheses indicate the corresponding relationship with the specific means described in the embodiments described later. Effect of the Invention

[0020] (Effect of the first feature) According to the present invention having the first characteristic described above, even if condensation occurs in the innermost insulation layer, the moisture caused by the condensation or the cold air generated by the cold water flowing inside the insulated hose can be prevented from being transmitted to the adjacent insulation layer on the outside. Therefore, according to the present invention having the above-mentioned first characteristic, it is possible to provide a thermally insulated hose whose outer surface is less susceptible to condensation. Furthermore, when manufacturing the insulated hose, the insulated hose is cut along a direction perpendicular to its axis to a predetermined length. Even if the insulation layer breaks off from the cut surface, each insulation layer is surrounded by a coating material, so there is no risk of fraying from the broken off portion. Furthermore, even if the covering material covering one insulation layer is torn and the insulation layer becomes detached from the torn area, there is no risk of other insulation layers becoming detached in conjunction with the detachment. Furthermore, because the coating material is one continuous piece of coating material, only one device for supplying the coating material and only one process for winding the coating material are required, compared to an insulated hose that uses two coating materials, which reduces the manufacturing costs of the insulated hose. In the case of a structure in which a plurality of covering materials are used to cover the periphery of each thermal insulation layer, the boundaries where the covering materials are discontinuous become weak against twisting, tension and bending. However, in the present invention which has the first characteristic described above, each insulation layer is covered with a single continuous coating material, there are no discontinuous areas in the coating material, and each insulation layer is integrated, making it possible to provide an insulated hose which is resistant to twisting, pulling, and bending.

[0021] moreover, The aforementioned 1 According to the present invention having the above features, even if condensation occurs in the innermost insulation layer, the moisture caused by the condensation or the cold air generated by the cold water flowing inside the insulated hose can be prevented from being transmitted to the adjacent insulation layer on the outside. Therefore, the above-mentioned 1According to the present invention having the above features, it is possible to provide a thermally insulated hose whose outer surface is less susceptible to condensation.

[0023] (Part 2 (Effect of the characteristics of The aforementioned 2 According to the present invention having the above features, the strength of the outside of the insulated hose can be increased, making the outside less likely to break when the insulated hose is bent. In addition, since the outer layer is formed by laminating multiple coating layers made of a coating material, the outer thickness of the insulated hose can be made as desired by controlling the number of coating layers. In addition, the outer layer, which is made of multiple laminated coating layers made of synthetic resin, is flexible and becomes the outer shell of the insulated hose, so that the insulated hose can be made flexible and its flexibility can be increased.

[0024] (Part 3 (Effect of the characteristics of The aforementioned 3 According to the present invention having the above features, it is possible to increase the strength of the inside of the insulated hose, making it difficult for the inside to be damaged when the insulated hose is bent, etc. Also, since the inner layer is formed by laminating multiple coating layers made of a coating material, the inner thickness of the insulated hose can be made as desired by controlling the number of laminations of the coating layers. In addition, the inner layer, which is made of multiple laminated coating layers made of synthetic resin, has flexibility and becomes the inner shell (core) of the insulated hose, which gives the insulated hose flexibility and also increases its flexibility.

[0025] (Part 4 (Effect of the characteristics of The aforementioned 4According to the present invention having the above features, since a linear reinforcing material made of synthetic resin is interposed between the innermost insulating layer and the covering material arranged inside the insulating layer, the strength of the insulated hose can be increased, making it difficult to crush and break, and also making it stronger against pulling. Furthermore, since the strength of the entire insulated hose can be increased, it is possible to provide an insulated hose that is difficult to buckle and crush even when an external load is applied or when it is bent, and that easily returns to its original shape.

[0026] (Part 5 (Effect of the characteristics of The aforementioned 5 According to the present invention having the above features, a first insulating material covered with a covering material and a second insulating material covered with a covering material can be formed simultaneously, and an insulated hose having a structure in which the second insulating material covered with a covering material is layered on top of the first insulating material covered with a covering material can be continuously manufactured in a single process, thereby improving manufacturing efficiency. Furthermore, because the coating material is one continuous piece, compared to a manufacturing method that uses two coating materials, only one device for supplying the coating material and only one process for winding the coating material are required, which reduces the manufacturing cost of the insulated hose and improves manufacturing efficiency. As described above, in the case of a structure in which a plurality of covering materials are used to cover the periphery of each thermal insulation layer, the boundaries where the covering materials are discontinuous become weak against twisting, tension and bending. However, the present invention, which has the sixth feature described above, surrounds each insulation layer with a single continuous coating material, so there are no discontinuous areas in the coating material and each insulation layer is integrated, making it possible to provide an insulated hose that is resistant to twisting, pulling, and bending.

[0028] (Part 6 (Effect of the characteristics of The aforementioned 6According to the present invention having the above features, the first insulating material and the second insulating material can be wound around the circumferential surface of the shaft member from predetermined positions, so that the second insulating material can be automatically wound around the first insulating material. In addition, 7 According to the present invention having the above features, the boundaries between the first insulating materials wrapped around the circumferential surface of the shaft member can be prevented from overlapping with the boundaries between the second insulating materials. Therefore, even if moisture or cold air penetrates through the boundaries of the first insulating materials, the movement of moisture to the second insulating material can be suppressed, making it difficult for the cold air to be transmitted. Furthermore, 7 According to the present invention having the above features, when the insulated hose is bent, even if spaces are generated along the axis of the insulated hose in the outer part in the bending direction, between the insulation layers formed by the first insulation material and between the insulation layers formed by the second insulation material, the spaces do not overlap in the direction perpendicular to the axis of the insulated hose, so that the movement of moisture from the inner space to the outer space is suppressed and cold air is less likely to be transmitted. Furthermore, when the insulated hose is bent, even if a space is formed between the insulation layer formed by the first insulation material and the insulation layer formed by the second insulation material in the inner part in the bending direction, no space is formed between adjacent insulation layers along the axis of the insulated hose.Therefore, even if moisture or cold air penetrates between the insulation layer formed by the first insulation material and the insulation layer formed by the second insulation material, the movement of moisture to the outside of the insulation layer formed by the second insulation material is suppressed, making it difficult for cold air to be transmitted.

[0029] (Part 7 (Effect of the characteristics of The aforementioned 7 According to the present invention having the above features, there is no risk of the welded portions of the coating materials coming off, and the first and second insulating materials can be sealed by the coating materials, so there is no risk of moisture transferring between the first and second insulating materials and cold air is less likely to be transmitted, making it possible to reduce the likelihood of condensation on the outer surface. In addition, 7According to the present invention having the above features, since the coating materials are welded together, no adhesive is required, and therefore manufacturing costs can be reduced. Furthermore, since the coating materials are welded together, the strength of the insulated hose can be increased compared to a structure in which the coating materials are bonded together with an adhesive.

[0030] (Part 8 (Effect of the characteristics of The aforementioned 8 According to the present invention having the above features, the reinforcing material and the first insulating material are wound around the inner layer, so that the strength of the insulated hose can be increased, so that the hose is less likely to be crushed and broken, and is more resistant to pulling. It is also possible to increase the restoring force in the event of crushing, bending, breaking, or twisting. In addition, since the inner layer is formed by laminating multiple coating layers made of a coating material, the inner side of the insulated hose can be made to a desired thickness by controlling the number of coating layers laminated. Furthermore, the inner layer, which is made of multiple laminated coating layers made of synthetic resin, has flexibility and becomes the inner shell (core) of the insulated hose, which gives the insulated hose flexibility and also increases its flexibility.

[0031] (Part 9 (Effect of the characteristics of The aforementioned 9 According to the present invention having the above features, since the inner layer and the reinforcing material can be welded together, it is possible to prevent the position of the reinforcing material from being displaced relative to the inner layer. 9 According to the present invention having the above features, the inner layer and the reinforcing material can be welded together without using an adhesive, which also reduces manufacturing costs.

[0032] (Part 10 (Effect of the characteristics of The aforementioned 10According to the present invention having the above features, the strength of the outside of the insulated hose can be increased, making the outside less likely to break when the insulated hose is bent. In addition, since the outer layer is formed by laminating multiple coating layers made of a coating material, the outer thickness of the insulated hose can be made as desired by controlling the number of coating layers. In addition, the outer layer, which is a laminate of multiple synthetic resin coating layers, has flexibility and serves as the outer shell of the insulated hose, making it difficult to break and easy to bend. Furthermore, the insulated hose can be made flexible, and its flexibility can be increased.

[0033] As mentioned above, the first to fourth 10 According to the present invention having any one of the above features, it is possible to provide a thermally insulated hose whose outer surface is less susceptible to condensation. [Brief description of the drawings]

[0034] [Figure 1] FIG. 1 is an explanatory diagram of a thermally insulated hose according to an embodiment of the present invention, showing a part of a cross section taken along an axis line. [Diagram 2] 2 is an enlarged view of a region indicated by the symbol A in FIG. [Diagram 3] FIG. 3 is a partially enlarged view of FIG. [Figure 4] 4A to 4C are cross-sectional explanatory views showing a process for forming the insulated hose. [Diagram 5] FIG. 5 is an enlarged view obtained by dividing FIG. 4 into two parts. [Figure 6] FIG. 4 is a cross-sectional explanatory view showing the structure of the insulated hose when the insulated hose is bent. [Figure 7] FIG. 7 is an enlarged explanatory cross-sectional view of the bent outer portion of FIG. 6. [Figure 8] FIG. 7 is an enlarged explanatory cross-sectional view of the bent inner portion of FIG. 6. [Figure 9] 5A and 5B are explanatory views of a manufacturing method for a thermally insulated hose according to an embodiment of the present invention, where FIG. 5A is an explanatory view of a manufacturing apparatus, and FIG. 5B is an explanatory view showing a method of winding a reinforcing member and a first insulating material around a shaft member. [Figure 10] FIG. 1 is a cross-sectional view showing a conventional heat-insulating hose taken along its axis. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0035] [Insulated hose structure] The structure of a thermally insulated hose according to an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the insulated hose 1 according to this embodiment is manufactured by winding each layer in a spiral shape as described below, and is formed with a total length L, an outer diameter φ1, and an inner diameter φ2, and has rigidity and flexibility. For example, the insulated hose 1 is a drain hose used in an air conditioner (air conditioner), and has a total length L of about 1,000 mm, an outer diameter φ1 of 30 to 50 mm, and an inner diameter φ2 of 10 to 40 mm. A cross section of the insulated hose 1 cut in a direction perpendicular to its axis (center axis) G is annular (not shown). As shown in FIG. 2 and FIG. 3, an inner layer 4 that becomes the inner shell (core) of the insulated hose 1 is disposed on the inner surface 2 of the insulated hose 1. The inner layer 4 is formed by laminating five coating layers 9a formed of synthetic resin. Since the coating layers 9a are integrated in a state of being welded to each other, there is no risk of the laminated structure of the coating layers 9a collapsing. For example, the thickness of the coating layer 9a is 0.1 to 2.0 mm.

[0036] An inner insulation layer 7a made of foamed resin is laminated on the outside of the inner layer 4. When the inner insulation layer 7a is cut along the axis G of the insulated hose 1, the cross-sectional shape is a substantially rectangular shape elongated in the direction of the axis G. The inner insulation layers 7a are arranged adjacent to each other along the axis G. Each inner insulation layer 7a is covered with a coating layer 9a without any gaps, and adjacent inner insulation layers 7a are not in contact with each other. In other words, each inner insulation layer 7a has an independent structure that is not in contact with each other. As shown in FIG. 3, among the boundaries 7b between the inner insulation layers 7a, the boundary 7c located on the inside is covered by the overlapping portion 4a. The overlapping portion 4a is formed by laminating six coating layers 9a, and the innermost coating layer 9a is the innermost coating layer 9a of the inner layer 4 formed under the adjacent inner insulation layer 7a on the rear side (left side in the figure). In the figure, the part indicated by the symbol E is the rear end E (FIG. 9) of one continuous coating material 9. The rear end E is shifted rearward (to the left in the drawing) from the boundary 7c so as not to coincide with the boundary 7c. If the length along the axis G of the inner insulation layer 7a is defined as the width w1 (FIG. 2) of the inner insulation layer 7a, the overlap k (FIG. 2) of the coating layer 9a forming the inner layer 4 is approximately the same as the width w1.

[0037] A reinforcing material 6 made of synthetic resin is interposed between the inner insulation layer 7a and the inner layer 4. The cross-sectional shape of the reinforcing material 6 is substantially circular. The reinforcing material 6 is wound around the inner layer 4 in a softened state so that it can be welded to the covering layer 9a, and the reinforcing material 6 and the inner layer 4 are in a welded state to each other, so that the arrangement position of the reinforcing material 6 relative to the inner layer 4 is unlikely to shift. The arrangement interval (pitch) p of each reinforcing material 6 along the axis G is substantially equal to the width w1.

[0038] An outer insulating layer 8a made of foamed resin is laminated on the outside of the inner insulating layer 7a via a coating layer 9a. The cross-sectional shape of the outer insulating layer 8a when cut along the axis G is a substantially rectangular shape similar to that of the inner insulating layer 7a, and the width is w1, which is the same as that of the inner insulating layer 7a. The outer insulating layers 8a are arranged so as to be adjacent to each other along the axis G. Each outer insulating layer 8a is covered with the coating layer 9a without any gaps, and adjacent outer insulating layers 8a are not in contact with each other. In other words, each outer insulating layer 8a has an independent structure that is not in contact with each other. The inner insulating layers 7a and the outer insulating layers 8a are shifted (displaced) from each other in their arrangement positions along the axis G by 0.5w1. As a result, the position of the boundary 7b between the inner insulating layers 7a relative to the axis G and the position of the boundary 8b between the outer insulating layers 8a relative to the axis G do not match, and are shifted (displaced) by 0.5w1. The inner insulating layer 7a and the outer insulating layer 8a are examples of the insulating layer of the present invention. Hereinafter, when matters common to the inner insulating layer 7a and the outer insulating layer 8a are explained, they may be simply referred to as the insulating layer.

[0039] As shown in FIG. 3, an outer layer 5 is formed on the outside of the outer insulation layer 8a. The outer layer 5 is formed by laminating two coating layers 9a. Of the boundaries 8b between the outer insulation layers 8a, the boundary 8c located on the outside is covered by the overlapping portion 5a. The overlapping portion 5a is formed by laminating three coating layers 9a, and the outermost coating layer 9a is the outermost coating layer 9a of the outer insulation layer 8a adjacent to the rear side (left side in the figure). In the figure, the portion indicated by the symbol S is the front end S of the coating material 9 (FIG. 9). The front end S is located in a position shifted forward (to the right in the figure) from the boundary 8c so as not to coincide with the boundary 8c. In other words, the insulated hose 1 has the inner insulating layer 7a, the reinforcing material 6 and the outer insulating layer 8a sandwiched between overlapping portions of a single covering material 9 (covering layer 9a) that is wound while overlapping in a spiral shape. Since the covering layers 9a are integrated together by welding, there is no risk of the laminated structure of the outer layer 5 collapsing. For example, the covering layer 9a is made of soft polyvinyl chloride (soft PVC), and the reinforcing material 6 is made of hard polyvinyl chloride (hard PVC). The inner and outer insulating layers 7a and 8a are each made of foamed polyethylene (PE).

[0040] As shown in Fig. 6, when the insulated hose 1 is bent, the outer insulation layer 8a and the inner insulation layer 7a on the outer side of the axis G each expand in the bending radius direction due to the elasticity of the foamed resin (Fig. 7), while the outer insulation layer 8a and the inner insulation layer 7a on the inner side of the axis G each contract in the bending radius direction (Fig. 8). Also, as shown in Fig. 7, air layers (gaps) 10 are formed between adjacent outer insulation layers 8a and between adjacent inner insulation layers 7a on the outer side of the axis G. Also, as shown in Fig. 8, air layers (gaps) 10 are formed between adjacent inner insulation layers 7a and outer insulation layers 8a and between adjacent outer insulation layers 8a and outer layer 5 on the inner side of the axis G. However, the inner layer 4, the outer layer 5, the outer insulation layers 8a, and the inner insulation layers 7a are not damaged, and the coating layers 9a covering the outer insulation layers 8a and the inner insulation layers 7a are not damaged either, so there is no risk of moisture moving from the inner insulation layer 7a to the outer insulation layer 8a through the gaps formed by bending, as in the past, and cold air is not easily transmitted. Therefore, condensation is not easily formed on the outer surface 3. In addition, the insulating properties, bending properties, and durability of the insulated hose 1 are not impaired. In addition, when the bent insulated hose 1 is returned to its pre-bending state, the air layers 10 are almost completely eliminated, and the outer insulation layers 8a and the inner insulation layers 7a return to their pre-deformation shapes.

[0041] [Insulated hose manufacturing equipment] Next, a manufacturing apparatus for the insulated hose 1 will be described with reference to Fig. 9. In Fig. 9, the direction in which the formation of the insulated hose 1 progresses is defined as the forward direction. The manufacturing device 80 of the thermal insulation hose 1 includes a shaft member 20, a coating material supplying device 30, a reinforcing material supplying device 40, a first insulating material supplying device 50, a second insulating material supplying device 60, a cooling device 70, a first guide member 71, a second guide member 72, and a guide roller 73. The shaft member 20 is formed in a substantially rod-like shape, and is connected to a rotating device (not shown) equipped with a motor or the like, and rotates around its own axis G in the direction indicated by the arrow F. The coating material supplying device 30 extrudes and supplies one continuous strip-shaped (sheet-shaped) coating material 9 from a nozzle 31 in a semi-molten state, that is, in a state in which the coating materials 9 are softened so that they can be welded together. The first insulating material supplying device 50 supplies a strip-shaped first insulating material 7, and the first insulating material 7 is guided to a winding position on the shaft member 20 by the first guide member 71. The first guide member 71 is attached to an attachment device (not shown) that can adjust its attachment position back and forth and left and right, and by adjusting the attachment position, the winding position of the first insulating material 7 can be adjusted.

[0042] The reinforcing material supplying device 40 supplies the linear reinforcing material 6 in a semi-molten state, that is, in a state softened so as to be weldable to the covering material 9, and the reinforcing material 6 is guided by the guide rollers 73 to the winding position of the shaft member 20 while placed on the first insulating material 7. In detail, the first insulating material 7 and the reinforcing material 6 are guided to the winding position of the shaft member 20 with the longitudinal center line of the upper surface of the first insulating material 7 and the axis of the reinforcing material 6 coinciding. The second insulating material supplying device 60 supplies the strip-shaped second insulating material 8, and the second guide member 72 guides the second insulating material 8 supplied from the second insulating material supplying device 60 to the winding position of the shaft member 20. The second guide member 72 is attached to an attachment device (not shown) capable of adjusting its own attachment position back and forth and left and right, and the winding position of the second insulating material 8 can be adjusted by adjusting the attachment position. In addition, the position where the first insulating material 7 is wound is located behind the position where the second insulating material 8 is wound, and the position where the first insulating material 7 is wound and the position where the second insulating material 8 is wound are separated by 1.5w1, which is longer than the width w1 of each of the first insulating material 7 and the second insulating material 8.

[0043] The cooling device 70 discharges cooling water onto the circumferential surface of the manufactured insulated hose 1 to cool the insulated hose 1. The covering material supplying device 30 is disposed on the left side of the axis G of the shaft member 20, and the reinforcing material supplying device 40, the first insulating material supplying device 50, and the second insulating material supplying device 60 are disposed on the right side of the axis G. In other words, the arrangement position of the covering material supplying device 30 and the arrangement positions of the reinforcing material supplying device 40, the first insulating material supplying device 50, and the second insulating material supplying device 60 are opposite to each other with respect to the axis G. By arranging them in this way, the first insulating material 7, the reinforcing material 6, and the second insulating material 8 wound around the shaft member 20 can be seen without being obstructed by the covering material 9. Hereinafter, when describing matters common to the first insulating material 7 and the second insulating material 8, they may be simply referred to as insulating materials.

[0044] [Insulated hose manufacturing method] First, the characteristics of the manufacturing method will be described with reference to Figs. 4 and 5. Fig. 4 is a cross-sectional view showing the process of forming the insulated hose 1, and Fig. 5 is an enlarged view obtained by dividing Fig. 4 into two. In Figs. 4 and 5, the direction in which the formation of the insulated hose 1 progresses is the forward direction. In Figs. 4 and 5, the reference characters (7-1) to (7-5) indicate the inner insulation layer 7a formed when the first insulation material 7 is wound 1 to 5 times, and the reference characters (8-2) to (8-5) indicate the outer insulation layer 8a formed when the second insulation material 8 is wound 2 to 5 times. For example, (7-5) is the inner insulation layer 7a formed when the first insulation material 7 is wound 5 times, and (8-5) is the outer insulation layer 8a formed when the second insulation material 8 is wound 5 times. For the sake of convenience, the inner insulation layers 7a indicated by the reference characters (7-1) to (7-5) will be referred to as the first to fifth rows of the inner insulation layers 7a, and the outer insulation layers 8a indicated by the reference characters (8-2) to (8-5) will be referred to as the second to fifth rows of the outer insulation layers 8a.

[0045] In Fig. 5, the uppermost covering layer 9a (hatched covering layer 9a) indicates the position of the covering material 9 during winding, with the reference character S indicating the front end of the covering material 9 in the width direction (Fig. 9) and the reference character E indicating the rear end of the covering material 9 in the width direction (Fig. 9). In the range from the front end S to the rear end E of the covering material 9, the first row (7-1) to the fifth row (7-5) of the inner insulation layer 7a are formed on the inner layer 4 formed by laminating five covering layers 9a, and the second row (8-2) to the fifth row (8-5) of the outer insulation layer 8a are laminated on top of them. Since the first insulation material 7 and the second insulation material 8 are wound around the shaft member 20 at the same time (Fig. 9), the fifth row (7-5) of the inner insulation layer 7a and the fifth row (8-5) of the outer insulation layer 8a indicate the latest rows that have just been wound.

[0046] In Fig. 4, comparing the winding positions (forming positions) of the fifth row (7-5) of the inner insulation layer 7a and the fifth row (8-5) of the outer insulation layer 8a, the fifth row (7-5) of the inner insulation layer 7a and the fifth row (8-5) of the outer insulation layer 8a are separated from each other by 1.5w1 in the front-to-back direction. In addition, the fifth row (8-5) of the outer insulation layer 8a is stacked with a shift of 0.5w1 forward from the fourth row (7-4) of the inner insulation layer 7a. The reason for this stacking structure will be described later.

[0047] In addition, a coating layer 9a is interposed between each of the inner and outer insulating layers 7a and 8a. This is because, as shown in Fig. 9(B), the first insulating material 7 and the second insulating material 8 are inserted and wound between the coating material 9 already wound around the circumferential surface of the shaft member 20 and the coating material 9 to be wound around the circumferential surface of the shaft member 20, so that the first insulating material 7 and the second insulating material 8 are wound spirally around the circumferential surface of the shaft member 20 with the top and bottom surfaces of each of the first insulating material 7 and the second insulating material 8 being sandwiched by the coating material 9. Furthermore, each of the inner and outer insulating layers 7a and 8a is covered with the covering layer 9a without any gaps because the covering material 9 is used in a softened state and is wound under tension.

[0048] Furthermore, inside the first row (7-1) to the fifth row (7-5) of the inner insulation layer 7a, an inner layer 4 formed by laminating five coating layers 9a is formed. This is because the width of the coating material 9 is at least five times the width w1 of the insulation layer, and the coating material 9 is spirally wound five times around the circumferential surface of the shaft member 20 so that the overlap k (FIG. 2) is the width w1 of the insulation layer to form the inner layer 4, and at the same time that the inner layer 4 is formed, the first insulation material 7 is spirally wound around the circumferential surface of the inner layer 4. 2 and 3, the outer layer 5 is formed by laminating two coating layers 9a. This is because the coating material 9 is wound from above the outer insulating layer 8a covered with the coating layer 9a so that the overlap k (FIG. 2) is the width w1 of the insulating layer.

[0049] When the shaft member 20 rotates once from the state shown in Fig. 4, the coating layer 9a behind the fifth row (7-5) of the inner insulation layer 7a (the left side in the figure) is increased by one layer to five layers, forming the inner layer 4, and the sixth row of the inner insulation layer 7a is formed on the inner layer 4, and at the same time, the sixth row of the outer insulation layer 8a is formed behind the fifth row (8-5) of the outer insulation layer 8a (the left side in the figure), the outer layer 5 is formed on the fourth row (8-4) of the outer insulation layer 8a, and the coating layer 9a is formed on the outside of the fifth row (7-5) of the inner insulation layer 7a and the fifth row (8-5) of the outer insulation layer 8a. In this way, the inner layer 4, the inner insulation layer 7a, the outer insulation layer 8a, and the outer layer 5 are formed successively every time the shaft member 20 rotates once.

[0050] While forming the inner layer 4 by laminating five coating layers 9a, the inner insulation layer 7a and the outer insulation layer 8a are formed so that the overlapping width k is 0.5w1, and further, in order to cover the periphery of each of the inner insulation layer 7a and the outer insulation layer 8a with the coating layer 9a, in this embodiment, the width of the coating material 9 is set to be five times or more the width w1 of each of the first insulation material 7 and the second insulation material 8. For example, when the width of the insulation material is 10 mm, the width of the coating material 9 is set to be 50 mm or more.

[0051] Next, a method for manufacturing the insulated hose 1 will be described with reference to FIG. The coating material supplying device 30 is driven to a state where one continuous coating material 9 can be supplied from the nozzle 31 in a semi-molten state. Also, the reinforcing material supplying device 40 is driven to a state where the reinforcing material 6 can be supplied in a semi-molten state. Also, the first insulating material supplying device 50 is driven to a state where the first insulating material 7 can be supplied, and the second insulating material supplying device 60 is driven to a state where the second insulating material 8 can be supplied. Also, the cooling device 70 is driven to a state where it can discharge cooling water.

[0052] (First process) 9, the coating material 9 extruded from the nozzle 31 of the coating material supply device 30 is wound under tension so as to overlap in a spiral shape around the circumferential surface of the shaft member 20 rotating in the direction of the arrow F. At this time, the coating material 9 is wound five times around the circumferential surface of the shaft member 20 so that the overlap k (FIG. 2) is equal to the width w1 of the insulating material, forming an inner layer 4 (FIG. 3) in which five coating layers 9a are laminated.

[0053] (Second Processing) Next, as shown in FIG. 9(B), the reinforcing material 6 supplied from the reinforcing material supply device 40 and the first insulating material 7 supplied from the first insulating material supply device 50 are wound between the inner layer 4 formed on the circumferential surface of the shaft member 20 and the covering material 9 to be wound around the circumferential surface of the shaft member 20 so that the reinforcing material 6 is interposed between the inner layer 4 formed on the circumferential surface of the shaft member 20 and the first insulating material 7. As a result, the first insulating material 7 is spirally wound around the circumferential surface of the inner layer 4 formed on the circumferential surface of the shaft member 20 in a state where the upper and lower surfaces of the first insulating material 7 are sandwiched between the inner layer 4 and the covering material 9 to be wound around the circumferential surface of the shaft member 20. As a result, an inner insulating layer 7a is formed on the inner layer 4, the reinforcing material 6 is interposed between the inner insulating layer 7a and the inner layer 4, and the inner insulating layer 7a is covered with the covering layer 9a (FIGS. 2 and 3).

[0054] (Third Processing) Furthermore, the first insulating material 7 and the reinforcing material 6 are spirally wound around the circumferential surface of the inner layer 4, and when the wound first insulating material 7 reaches the winding position of the second insulating material 8, the second insulating material 8 supplied from the second insulating material supply device 60 is wound between the first insulating material 7 wound around the circumferential surface of the shaft member 20 and covered with the covering material 9, and the covering material 9 to be wound around the circumferential surface of the shaft member 20. As a result, the second insulating material 8 is spirally wound around the circumferential surface of the first insulating material 7 wound around the circumferential surface of the shaft member 20 and covered with the covering material 9, with its upper and lower surfaces sandwiched between the first insulating material 7 covered with the covering material 9 and the covering material 9 to be wound around the circumferential surface of the shaft member 20. As a result, the outer heat insulating layer 8a covered with the coating layer 9a is laminated on the inner heat insulating layer 7a covered with the coating layer 9a (FIGS. 4 and 5). By winding the second insulating material 8 when the portion of the first insulating material 7 sandwiched between the inner layer 4 and the covering material 9 is in the position to wind the second insulating material 8, the second insulating material 8 covered with the covering layer 9a can be laminated on the first insulating material 7 covered with the covering layer 9a. The timing for winding the second insulating material 8 may be an appropriate timing after the wound first insulating material 7 has passed the winding position of the second insulating material 8.

[0055] In Fig. 9(A), if the direction in which the formation of the insulated hose 1 progresses is the forward direction, the position where the first insulating material 7 is wound is 1.5w1 away from the position where the second insulating material 8 is wound, that is, it is one and a half turns of insulating material away from the rear. In other words, the winding position of the first insulating material is behind the winding position of the second insulating material, and the distance between the first insulating material 7 and the second insulating material 8 is 0.5w1. As a result, as shown in Fig. 4, the outer insulating layer 8a is layered on the inner insulating layer 7a with a shift of 0.5w1 forward from the inner insulating layer 7a. If the position at which the first insulating material 7 is wound is 1.0w1 away from the position at which the second insulating material 8 is wound, that is, if there is no gap between the wound first insulating material 7 and the second insulating material 8, the outer insulating layer 8a will be stacked without being misaligned with respect to the inner insulating layer 7a.

[0056] In the example shown in Fig. 4, the fifth row (8-5) of the outer insulation layer 8a is laminated on the fourth row (7-4) of the inner insulation layer 7a, because at the fifth winding, the fifth row (7-5) of the inner insulation layer 7a formed at that time has not reached the winding position of the second insulation material 8, but the fourth row (7-4) of the inner insulation layer 7a formed at the fourth winding has reached the winding position. In addition, (8-5) of the outer insulation layer 8a is laminated shifted forward by 0.5w1 relative to (7-4) of the inner insulation layer 7a, because the position at which the first insulation material 7 is wound is one and a half turns of insulation material backward from the position at which the second insulation material is wound. In other words, the position where the second insulating material 8 is wound is spaced forward from the position where the first insulating material 7 is wound by one and a half turns of insulating material.

[0057] The insulated hose 1 manufactured by simultaneously carrying out the above-mentioned first to third processes in one step is cooled by cooling water discharged from the cooling device 70 as it passes below the cooling device 70. Then, when a sensor detects that the manufactured insulated hose 1 has reached a target length, a cutting device (not shown) is operated to automatically cut the hose, thereby obtaining the insulated hose 1 of the target length.

[0058] [Effects of the embodiment] (1) In the insulated hose 1 according to the embodiment described above, an inner insulation layer 7a formed from a first insulation material 7 and an outer insulation layer 8a formed from a second insulation material 8 are formed between the inner surface 2 and the outer surface 3, and each inner insulation layer 7a and each outer insulation layer 8a are respectively covered by a coating layer 9a formed from a coating material 9, so that the inner insulation layers 7a and the outer insulation layers 8a are not in contact with each other, and further, the inner insulation layers 7a and the outer insulation layers 8a are also not in contact with each other. Therefore, according to the insulated hose 1 of the above-described embodiment, even if condensation occurs in the inner insulation layer 7a, the movement of moisture due to condensation to the outer insulation layer 8a can be suppressed, and the cold air generated from the cold water flowing inside the insulated hose 1 is made less likely to be transmitted, so that an insulated hose whose outer surface 3 is less likely to condense can be provided. Furthermore, when manufacturing the insulated hose 1, the insulated hose is cut in a direction perpendicular to its axis G. Even if the insulation layer breaks off from the cut surface, there is no risk of fraying from the broken off portion because each insulation layer is surrounded by the covering layer 9a. Therefore, when attaching a connecting member such as a cuff to the end of the manufactured insulated hose 1 for connecting to a duct on the air conditioning unit side, if the insulating layer has detached from the cut surface of the insulated hose 1, manual work will be required to return the detached part to its original position; however, because the insulating layer rarely detaches from the cut surface of the insulated hose 1, the work of attaching the above-mentioned connecting member can be made more efficient. In addition, since each inner insulation layer 7a and each outer insulation layer 8a is covered by a coating layer 9a, even if, for example, the coating layer 9a covering one of the insulation layers is torn and the insulation layer comes off at the torn location, causing fraying, there is no risk of the other insulation layer coming off in conjunction with the fraying.

[0059] (2) Furthermore, when the insulated hose 1 according to the above-described embodiment is cut along the direction of its axis G, the peripheral surfaces of each inner insulation layer 7a and each outer insulation layer 8a are each covered by a coating layer 9a, making them independent structures. Therefore, according to the insulated hose 1 of the embodiment described above, even if condensation occurs in the inner insulation layer 7a, the movement of moisture due to condensation to the outer insulation layer 8a can be suppressed, and the cold air generated from the cold water flowing inside the insulated hose 1 is made less likely to be transmitted, so that an insulated hose whose outer surface 3 is less likely to condense can be provided.

[0060] (3) Furthermore, in the insulated hose 1 according to the embodiment described above, the covering material 9 is one continuous covering material. Compared to an insulated hose using two covering materials, only one device for supplying the covering material 9 and only one process for winding the covering material 9 are required, thereby reducing the manufacturing costs of the insulated hose 1. In the case of a structure in which a plurality of covering materials 9 are used to cover the periphery of each of the inner and outer insulating layers 7a and 8a, the boundaries where the covering materials 9 are discontinuous become weak against twisting, tension and bending. However, in the insulated hose 1 according to the embodiment described above, each of the inner insulation layers 7a and each of the outer insulation layers 8a are covered by a single continuous covering material 9, there are no discontinuous parts of the covering material 9, and each of the inner insulation layers 7a and each of the outer insulation layers 8a are integrated, making it possible to provide an insulated hose 1 that is resistant to twisting, pulling and bending. (4) Furthermore, in the insulated hose 1 according to the embodiment described above, the outside of the outer insulating layer 8a is covered by the outer layer 5 having multiple laminated coating layers 9a made of coating material 9. This increases the strength of the outside of the insulated hose 1, making the outside less susceptible to damage when the insulated hose 1 is bent. Furthermore, since the outer layer 5 is formed by laminating a plurality of coating layers 9a made of the coating material 9, the outer layer of the insulated hose 1 can be made to a desired thickness by controlling the number of coating layers 9a laminated. Furthermore, the outer layer 5, which is made of multiple laminated coating layers 9a made of synthetic resin, has flexibility and serves as the outer shell of the insulated hose 1, thereby imparting flexibility to the insulated hose 1 and also increasing its flexibility.

[0061] (5) Furthermore, in the insulated hose 1 according to the embodiment described above, the inside of the inner insulating layer 7a is covered with the inner layer 4 having multiple laminated coating layers 9a made of the coating material 9. This increases the strength of the inside of the insulated hose 1, making the inside less susceptible to damage when the insulated hose 1 is bent. Furthermore, since the inner layer 4 is formed by laminating a plurality of coating layers 9a made of the coating material 9, the inner side of the insulated hose 1 can be made to a desired thickness by controlling the number of coating layers 9a laminated. Furthermore, the inner layer 4, which is formed by laminating multiple coating layers 9a made of synthetic resin, has flexibility and serves as the inner shell (core) of the insulated hose 1, thereby imparting flexibility to the insulated hose 1 and also increasing its flexibility.

[0062] (6) Furthermore, in the insulated hose 1 according to the embodiment described above, the rear end E of the covering material 9 is positioned rearward of the boundary 7c of the inner insulation layer 7a so as not to coincide with the boundary 7c. Therefore, even if the rear end E peels off and moisture or cold air penetrates through the gap between the covering layers 9a in the peeled portion, the moisture or cold air is unlikely to reach the inner insulation layer 7a through the boundary 7c, which makes it difficult for the durability of the insulated hose to decrease. (7) Furthermore, in the insulated hose 1 according to the embodiment described above, the front end S of the covering material 9 is positioned forward of the boundary 8c of the outer insulation layer 8a so as not to coincide with the boundary 8c. Therefore, even if the front end S peels off and moisture or cold air penetrates through the gap between the covering layers 9a at the peeled off portion, the moisture or cold air is unlikely to reach the outer insulation layer 8a through the boundary 8c, which makes it difficult for the durability of the insulated hose to decrease.

[0063] (8) Furthermore, in the insulated hose 1 according to the embodiment described above, linear reinforcing members 6 made of synthetic resin are interposed between the inner layer 4 and the inner insulating layer 7a. Therefore, according to the insulated hose 1 according to the embodiment described above, the strength of the entire insulated hose 1 can be increased, so that an insulated hose can be provided that is less likely to buckle or collapse even when an external load is applied or when it is bent, and that furthermore, that easily restores to its original shape.

[0064] (9) Furthermore, according to the method for manufacturing the insulated hose according to the embodiment described above, the inner layer 4 laminated with the coating layer 9a, the inner insulation layer 7a covered with the coating layer 9a, the outer insulation layer 8a covered with the coating layer 9a, and the outer layer 5 laminated with the coating layer 9a can be simultaneously formed and the insulated hose 1 having a structure in which these are laminated in order from the inside can be continuously manufactured in a single process, thereby improving manufacturing efficiency. (10) Furthermore, according to the manufacturing method of the insulated hose of the embodiment described above, a single continuous coating material 9 is used. Therefore, compared to a manufacturing method using two coating materials, only one device for supplying the coating material 9 and only one process for winding the coating material 9 are required. This reduces the manufacturing cost of the insulated hose 1 and improves manufacturing efficiency.

[0065] (11) Furthermore, in accordance with the method for manufacturing the insulated hose according to the embodiment described above, the first insulating material 7 and the second insulating material 8 have the same width w1, and when the direction in which the formation of the insulated hose 1 progresses is defined as the forward direction, the position at which the first insulating material 7 is wound is behind the position at which the second insulating material 8 is wound, and the position at which the first insulating material 7 is wound and the position at which the second insulating material 8 is wound are separated by 1.5w1. Therefore, according to the manufacturing method of the insulated hose of the embodiment described above, the first insulating material 7 and the second insulating material 8 can be automatically wound on top of the first insulating material 7 by winding the first insulating material 7 and the second insulating material 8 respectively around the circumferential surface of the shaft member 20 from predetermined positions. In addition, since the boundary 7b between the inner insulation layers 7a formed by the first insulation material 7 and the boundary 8b between the outer insulation layers 8a formed by the second insulation material 8 can be prevented from overlapping, even if moisture or cold air penetrates through the boundary 7b between the inner insulation layers 7a, the movement of moisture to the outer insulation layer 8a can be suppressed and the transmission of cold air can be made difficult, thereby providing an insulated hose whose outer surface 3 is less prone to condensation. Furthermore, according to the manufacturing method for the insulated hose of the embodiment described above, even if spaces 10 are generated between the inner insulation layers 7a and between the outer insulation layers 8a along the axis G of the insulated hose 1 in the outer part of the bending direction when the insulated hose 1 is bent as shown in Figure 7, the spaces 10 do not overlap in a direction perpendicular to the axis G of the insulated hose 1, thereby suppressing the movement of moisture from the inner space 10 to the outer space 10 and making it difficult for cold air to be transmitted. Furthermore, when the insulated hose 1 is bent, even if a space 10 is formed between the inner insulation layer 7a and the outer insulation layer 8a in the inner part in the bending direction as shown in Figure 8, a space 10 is not formed between adjacent insulation layers along the axis G of the insulated hose 1. Therefore, even if moisture or cold air penetrates between the inner insulation layer 7a and the outer insulation layer 8a, the movement of moisture to the outside of the outer insulation layer 8a can be suppressed, making it difficult for cold air to be transmitted.

[0066] (12) Furthermore, according to the manufacturing method of the insulated hose of the embodiment described above, the coating material 9 is softened so that the coating materials 9 can be welded to each other, so there is no risk of the welded portions of the coating materials 9 peeling off. Furthermore, the inner insulation layer 7a and the outer insulation layer 8a covered by the coating material 9 can be sealed, so there is no risk of moisture transferring between the inner insulation layer 7a and the outer insulation layer 8a. As a result, cold air is less likely to be transmitted, and condensation on the outer surface 3 is less likely to occur. In addition, since the covering materials 9 are welded together, no adhesive is required, which also reduces manufacturing costs. Furthermore, since the covering materials 9 are welded together, the strength of the insulated hose 1 can be increased compared to a structure in which the covering materials 9 are bonded together with an adhesive.

[0067] (13) Furthermore, according to the manufacturing method for the insulated hose according to the embodiment described above, the covering material 9 is wound multiple times around the circumferential surface of the shaft member 20 in a spiral manner to form the inner layer 4 in which the covering layer 9a made of the covering material 9 is laminated in multiple layers, and the reinforcing material 6 and the first insulating material 7 are wound on the inner layer 4, thereby increasing the strength of the insulated hose 1 and making it less likely to be crushed or broken and moreover, more resistant to pulling. It is also possible to increase the recovery force in the event of crushing, bending, breaking or twisting. Furthermore, since the inner layer 4 is formed by laminating a plurality of coating layers 9a made of the coating material 9, the inner side of the insulated hose 1 can be made to a desired thickness by controlling the number of coating layers 9a laminated. Furthermore, the inner layer 4, which is formed by laminating multiple coating layers 9a made of synthetic resin, has flexibility and serves as the inner shell (core) of the insulated hose 1, thereby imparting flexibility to the insulated hose 1 and also increasing its flexibility.

[0068] (14) Furthermore, according to the manufacturing method for the insulated hose of the embodiment described above, when the second insulating material 8 is spirally wound around the circumferential surface of the first insulating material 7 covered by the covering material 9, the covering material 9 is wound multiple times so as to overlap spirally around the circumferential surface of the second insulating material 8, thereby forming an outer layer 5 having multiple laminated covering layers 9a made of the covering material 9 on the outside of the outer insulating layer 8a. This increases the strength of the outside of the insulated hose 1, making it difficult for the outside to be damaged when the insulated hose 1 is bent. Furthermore, since the outer layer 5 is formed by laminating a plurality of coating layers 9a made of the coating material 9, the outer layer of the insulated hose 1 can be made to a desired thickness by controlling the number of coating layers 9a laminated. Moreover, the outer layer 5, which is formed by laminating multiple coating layers 9a made of synthetic resin, has flexibility and becomes the outer shell of the insulated hose 1, so that it is difficult to break and easy to bend. Furthermore, the insulated hose 1 can be made flexible, and its flexibility can also be increased.

[0069] (15) Furthermore, according to the manufacturing method of the insulated hose of the embodiment described above, the reinforcing material 6 is softened so that it can be welded to the inner layer 4. This allows the inner layer 4 and the reinforcing material 6 to be welded together, making it difficult for the reinforcing material 6 to shift from its position relative to the inner insulation layer 7a. Furthermore, since the inner layer 4 and the reinforcing material 6 can be bonded together without using an adhesive, the manufacturing costs can be reduced.

[0070] (16) As described above, according to the insulated hose and the manufacturing method thereof according to the above-described embodiment, it is possible to provide an insulated hose whose outer surface 3 is less susceptible to condensation.

[0071] Other Embodiments (1) The insulated hose 1 according to the embodiment described above has a two-layer structure in which the inner insulating layer 7a and the outer insulating layer 8a are laminated, but it can also have a three-layer or more structure depending on the application of the insulated hose 1. When manufacturing an insulated hose with this structure, a band-shaped third insulating material made of foamed resin is wound over the second insulating material at a position 1.5w1 forward from the winding position of the second insulating material. In other words, by setting the winding positions of the insulating materials to positions 1.5w1 apart from each other, it is possible to manufacture an insulated hose having a three-layer or more structure in which each layer is covered by a covering layer 9a and in which the upper and lower layers are stacked with a shift of 0.5w1 between them. (2) The inner layer 4 may have a structure other than five layers, such as a two-layer to four-layer structure, or a six-layer or more layer structure. In addition, by changing the number of layers of the coating layer 9a, the flexibility of the inner layer 4, i.e., the flexibility of the insulated hose 1, can be adjusted. (3) The outer layer 5 can also be formed by laminating three or more coating layers 9a.

[0072] (4) The covering layer 9a can be made of a soft synthetic resin other than soft polyvinyl chloride (soft PVC). The reinforcing material 6 can be made of a hard material other than hard polyvinyl chloride (hard PVC), or can be made of a metal material. The material forming the inner insulation layer 7a and the outer insulation layer 8a can be changed to a material other than foamed polyethylene (PE). For example, it can be changed to a hard urethane foam or phenol foam. (5) The width of the covering material 9 can be changed depending on the number of laminated insulating layers. The thickness of the covering material 9 can be changed in consideration of the flexibility and strength of the insulated hose 1. The thickness and width of the insulating material can be changed depending on the application of the insulated hose 1, etc. (6) The offset width (displacement width) of each inner insulation layer 7a and each outer insulation layer 8a along the axis G can also be adjusted to a value other than 0.5w1 by adjusting the winding position of the first insulation material 7 or the second insulation material 8. [Explanation of symbols]

[0073] 1... Insulated hose, 2... Inner surface, 3... Outer surface, 4... Inner layer, 5... Outer layer, 6··reinforcing material, 7··first insulation material, 7a··inner insulation layer, 8··second insulation material, 8a...Outer insulation layer, 9...Covering material, 9a...Covering layer, 10...Air layer, 20...Shaft member, 30...Coating material supply device, 40...Reinforcement material supply device, 50: first insulation material supply device, 60: second insulation material supply device, 70...cooling device, 80...manufacturing device, G...axis, k...overlap, S··front end, E··rear end, w1··width of insulation.

Claims

1. A flexible insulated hose formed by spirally winding a strip-shaped insulation material made of synthetic resin and a strip-shaped covering material made of synthetic resin, Between the inner surface and the outer surface of the insulated hose, an inner insulation layer formed by the insulating material and an outer insulation layer laminated on the outside of the inner insulation layer are formed, The inner insulating layers are arranged adjacent to each other along an axis of the insulated hose, The outer insulating layers are arranged adjacent to each other along an axis of the insulated hose, When the thermal insulation hose is cut along the axial direction, the peripheral surface of the inner insulation layer and the peripheral surface of the outer insulation layer are each an independent structure covered with the covering material, The adjacent inner insulation layers are not in contact with each other, the adjacent outer insulation layers are not in contact with each other, and the inner insulation layer and the outer insulation layer are not in contact with each other, 13. An insulated hose, wherein the covering material is a single continuous covering material.

2. 2. The insulated hose according to claim 1, wherein the outside of the outermost insulating layer is covered with an outer layer formed by laminating a plurality of coating layers made of the coating material.

3. 3. The insulated hose according to claim 1, wherein an inner layer, in which a plurality of coating layers made of the coating material are formed, is disposed inside the innermost insulating layer.

4. 4. The insulated hose according to claim 1, wherein a linear reinforcing material made of synthetic resin is interposed between the innermost insulating layer and the covering material arranged on the inner side of the insulating layer.

5. a covering material supplying device that supplies one continuous covering material, which is a strip-shaped covering material formed from synthetic resin; a reinforcing material supplying device that supplies linear reinforcing material; a first insulating material supplying device that supplies a strip-shaped first insulating material formed from synthetic resin; and a second insulating material supplying device that supplies a strip-shaped second insulating material formed from synthetic resin, are arranged around a rotating shaft member; The coating material supplied from the coating material supply device is wound around the circumferential surface of the rotating shaft member so as to overlap in a spiral shape; the reinforcing material supplied from the reinforcing material supply device and the first insulating material supplied from the first insulating material supply device are spirally wound around the circumferential surface of the insulating material wound around the circumferential surface of the shaft member, in a state where the reinforcing material is sandwiched between the insulating material wound around the circumferential surface of the shaft member and the insulating material to be wound around the circumferential surface of the shaft member, so that the reinforcing material is interposed between the insulating material wound around the circumferential surface of the shaft member and the first insulating material; A method for manufacturing an insulated hose, characterized in that the second insulating material supplied from the second insulating material supply device is spirally wound around the circumferential surface of the first insulating material, which is wound around the circumferential surface of the axial member and covered with the covering material, while being sandwiched between the first insulating material, which is wound around the circumferential surface of the axial member and covered with the covering material, and the covering material that is about to be wound around the axial member.

6. The first insulation material and the second insulation material have the same width; 6. The method for manufacturing an insulated hose according to claim 5, wherein, when the direction in which the formation of the insulated hose progresses is forward, a position at which the first insulating material is wound is located behind a position at which the second insulating material is wound, and the positions at which the first insulating material is wound and the second insulating material are wound are spaced apart by a distance longer than the width.

7. 7. The method for manufacturing a thermally insulated hose according to claim 5, wherein the coating material is softened so that the coating materials can be welded to each other.

8. 8. The method for manufacturing an insulated hose according to claim 5, further comprising winding the covering material a plurality of times around the circumferential surface of the axial member in a spiral manner to form an inner layer in which a plurality of covering layers made of the covering material are laminated, and then winding the reinforcing material and the first insulating material on top of the inner layer.

9. The reinforcing material is made of a synthetic resin, The method for manufacturing a thermally insulated hose according to claim 8, wherein the reinforcing material is softened so as to be weldable to the inner layer.

10. 10. A method for manufacturing an insulated hose as described in any one of claims 5 to 9, characterized in that when the second insulating material is spirally wound around the circumferential surface of the first insulating material covered by the coating material, the coating material is wound multiple times so as to overlap spirally around the circumferential surface of the second insulating material, thereby forming an outer layer composed of multiple laminated coating layers made of the coating material on the outside of the second insulating material.

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