JP2013151990A - Flexible hose - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flexible hose 20 in which a wrinkle is hardly produced on its inner circumferential surface.SOLUTION: A hose 20 includes a hose wall 22 and a reinforcing body 24. The reinforcing body 24 is embedded in the hose wall 22. The hose wall 22 is molded with a soft resin composition. The hose wall 22 includes an inner layer 26, an outer layer 28 and a separating wall 30. The reinforcing body 24 is molded with a hard resin composition. The reinforcing body 24 is spirally wound. A sectional shape of the reinforcing body 24 is flat. The reinforcing body 24 includes an inside surface 34, an outside surface 36, a first lateral rim 38 and a second lateral rim 40. The first lateral rim 38 includes a protrusion 42. The second lateral rim 40 includes a depression 44. A space S is formed between the first lateral rim 38 and the separating wall 30. A space S is formed also between the second lateral rim 40 and the separating wall 30. When the hose 20 curves, the protrusion 42 is fitted into a depression 44 adjacent thereto.

Description

  The present invention relates to a flexible hose used for a drain pipe or the like. Specifically, the present invention relates to a hose including a hose wall and a reinforcing body embedded in the hose wall.

  A flexible hose is used as the drain pipe. The hose includes a hose wall and a reinforcement body embedded in the hose wall. This hose can be installed in a curved state. Therefore, the degree of freedom of the installation location is high. Even if an impact is applied to the hose due to an earthquake, the hose is hardly damaged.

  Japanese Patent Application Laid-Open No. 9-268617 discloses a hose in which a reinforcing body is spirally wound. Japanese Patent Laid-Open No. 2002-267056 discloses a hose having a non-circular cross section. Japanese Patent Application Laid-Open No. 2003-49978 discloses a hose having a reinforcing body whose cross-sectional shape is a parallelogram.

JP-A-9-268617 JP 2002-267056 A JP 2003-49978 A

  When the hose bends, it extends outside the shaft and contracts inside the shaft. A compressive stress is applied inside the shaft. If the compressive stress is excessive, wrinkles occur on the inner peripheral surface of the hose. This dredging reduces the drainage capacity of the hose. Sewage and filth are likely to stay in the ridge. This sewage and filth can cause odors.

  FIG. 7 shows a cross section of the curved hose 2. The hose 2 includes a hose wall 4 and a reinforcing body 6. The hose wall 4 has an inner layer 8, an outer layer 10, and a partition wall 12. The reinforcing body 6 is surrounded by the inner layer 8, the outer layer 10, and the partition wall 12. According to the knowledge obtained by the present inventor, one of the causes of wrinkles is that a part of the reinforcing body 6 protrudes from the row inside the shaft 14 as shown in FIG. The reinforcing body 6 protrudes inside the hose 2 in the radial direction. Due to this protrusion, the inner layer 8 partially protrudes and wrinkles occur.

  An object of the present invention is to provide a flexible hose that is less prone to protrusion of the reinforcing body and therefore is less likely to cause wrinkles on the inner peripheral surface.

  The flexible hose according to the present invention includes a cylindrical hose wall and a reinforcing body embedded in the hose wall and wound spirally. The side edge of this reinforcing body has a convex part and / or a concave part that can engage with an adjacent side edge.

  The hose wall can be molded from a resin composition. Preferably, the reinforcement body is shape | molded from the resin composition harder than the resin composition of a hose wall. Preferably, the reinforcing body is not joined to the hose wall.

  Preferably, one side edge of the reinforcing body has a convex portion, and the other side edge has a concave portion.

  Preferably, the axial distance between the side edge of the reinforcing body and the side edge adjacent to the side edge is smaller than the radial thickness of the reinforcing body.

  The hose wall can have an inner layer, an outer layer, and a partition wall. This partition wall extends from the inner layer to the outer layer. The reinforcing layer is accommodated in the accommodating portion surrounded by the inner layer, the outer layer, and the partition wall. Preferably, a space is formed between the partition wall and the reinforcing body.

  In the flexible hose according to the present invention, the side edge of the reinforcing body can be engaged with the adjacent side edge. By this engagement, even when the hose is curved, the protrusion of the reinforcing body from the row is suppressed. With this hose, wrinkles are unlikely to occur on the inner peripheral surface.

FIG. 1 is a partially cutaway front view showing a flexible hose according to an embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view showing a part of the hose of FIG. FIG. 3 is a cross-sectional view showing the hose of FIG. FIG. 4 is a perspective view showing how the hose of FIG. 1 is manufactured. FIG. 5 (a) is a cross-sectional view showing a flexible hose reinforcement according to another embodiment of the present invention, and FIG. 5 (b) is a flexibility according to still another embodiment of the present invention. FIG. 5C is a cross-sectional view showing a hose reinforcement body, and FIG. 5C is a cross-sectional view showing a flexible hose reinforcement body according to still another embodiment of the present invention. FIG. 5 is a cross-sectional view showing a flexible hose reinforcement body according to still another embodiment of the present invention, and FIG. 5E is a flexible hose reinforcement body according to still another embodiment of the present invention. FIG. 5 (f) is a cross-sectional view showing a flexible hose reinforcing body according to still another embodiment of the present invention. FIG. 6 is a cross-sectional view illustrating a part of a flexible hose according to still another embodiment of the present invention. FIG. 7 is a cross-sectional view showing a flexible hose with wrinkles.

  Hereinafter, the present invention will be described in detail based on preferred embodiments with appropriate reference to the drawings.

  A hose 20 is shown in FIGS. The hose 20 can be used as piping for drainage equipment such as a kitchen in a house and a bath. The hose 20 has flexibility. Accordingly, the hose 20 can be installed in a curved state. The hose 20 may be installed in a straight line. 1 and 2, the arrow X represents the axial direction of the hose 20, and the arrow Y represents the radial direction of the hose 20.

  The hose 20 includes a hose wall 22 and a reinforcing body 24. The hose wall 22 is cylindrical. The inner peripheral surface of the hose wall 22 is smooth. The reinforcing body 24 is embedded in the hose wall 22.

  The hose wall 22 is molded from a resin composition. This resin composition is soft. Examples of the base resin suitable for the hose wall 22 include soft vinyl chloride resin, vinyl acetate resin, and various thermoplastic elastomers. From the viewpoint of strength, durability and flexibility, a preferred base resin is a soft vinyl chloride resin. A vinyl chloride resin plasticized with a non-migrating plasticizer is particularly preferred.

  The hose wall 22 has an inner layer 26, an outer layer 28, and a partition wall 30. The inner layer 26 is cylindrical. The outer layer 28 is also cylindrical. The outer layer 28 is located radially outside the inner layer 26. The outer layer 28 is located at a predetermined interval from the inner layer 26. As shown by a dotted line in FIG. 1, the partition wall 30 has a spiral shape. In the cross section shown in FIG. 2, the partition wall 30 extends from the inner layer 26 to the outer layer 28. The partition wall 30 extends substantially in the radial direction. The inner layer 26, the outer layer 28, and the partition wall 30 are integrated. By being surrounded by the inner layer 26, the outer layer 28 and the partition wall 30, a housing portion 32 (see FIG. 1) is formed on the hose wall 22. Since the partition wall 30 is spiral, the accommodating part 32 is also spiral.

  The reinforcing body 24 is formed from a resin composition. The base resin of this resin composition is harder than the resin composition of the hose wall 22. Examples of the base resin suitable for the reinforcing body 24 include polypropylene, high-density polyethylene, and hard vinyl chloride resin. From the viewpoint of strength and heat resistance, a particularly preferred base resin is polypropylene.

  The reinforcing body 24 is wound spirally. The reinforcing body 24 is accommodated in the accommodating portion 32. In FIG. 2, an arrow W indicates the width of the reinforcing body 24, and an arrow T indicates the thickness of the reinforcing body 24. The width W is measured along the axial direction. The thickness T is measured along the radial direction. The width W is larger than the thickness T. In other words, the cross-sectional shape of the reinforcing body 24 is flat.

  As shown in FIG. 2, the reinforcing body 24 includes an inner surface 34, an outer surface 36, a first side edge 38, and a second side edge 40. The inner side surface 34 is flat in the axial direction. The outer side surface 36 is also flat in the axial direction. The inner side surface 34 and the outer side surface 36 contribute to smoothing the inner peripheral surface of the hose wall 22. In the hose 20 having a smooth inner peripheral surface, sewage, filth, and the like are unlikely to stay.

  The first side edge 38 includes a convex portion 42. The convex portion 42 projects in the axial direction. The convex portion 42 has a “V” shape. The second side edge 40 includes a recess 44. The recess 44 is recessed in the axial direction. The shape of the recess 44 is a “V” shape.

  The inner side surface 34 is in close contact with the inner layer 26. The inner side surface 34 may be separated from the inner layer 26. The outer side surface 36 is in close contact with the outer layer 28. The outer side surface 36 may be separated from the outer layer 28. A space S is formed between the first side edge 38 and the partition wall 30. A space S is also formed between the second side edge 40 and the partition wall 30. Air enters the space S. The first side edge 38 may be in close contact with the partition wall 30. The second side edge 40 may be in close contact with the partition wall 30.

  The reinforcing body 24 is not joined to the hose wall 22. Accordingly, the hose wall 22 can move relative to the reinforcing body 24. As described above, the hose wall 22 is soft. The hose wall 22 is easy to expand and contract. On the other hand, the reinforcing body 24 is hard. The reinforcing body 24 is difficult to expand and contract. Since the reinforcing body 24 is not joined to the hose wall 22, the hose wall 22 can expand and contract separately from the reinforcing body 24. The reinforcing body 24 may be joined to the hose wall 22. When the reinforcing body 24 is joined to the hose wall 22, a part of the outer surface 36 of the reinforcing body 24 and the hose wall 22 are partially joined from the viewpoint that the flexibility of the hose 20 is not hindered. It is preferable.

  FIG. 3 shows a curved hose 20. In the state shown in FIG. 3, the hose wall 22 existing outside the shaft 46 is extended. Due to this extension, the volume of the space S existing outside the shaft 46 is expanded as compared with the state shown in FIG. In the state shown in FIG. 3, the hose wall 22 existing inside the shaft 46 is contracted. Due to this contraction, the volume of the space S existing inside the shaft 46 is reduced as compared with the state shown in FIG. In the state shown in FIG. 3, the volume of the space S is substantially zero on the innermost side of the curve.

  As described above, since the reinforcing body 24 is not joined to the hose wall 22, the reinforcing body 24 does not hinder the expansion and reduction of the space S. As the space S expands and contracts, the air in the space S moves. Accordingly, the internal pressure of the space S does not hinder the expansion and reduction of the space S. This hose 20 is excellent in flexibility.

  As is clear from FIG. 3, the first side edge 38 is in contact with the adjacent second side edge 40 via the partition wall 30 on the innermost side of the curve. Therefore, the reinforcing body 24 opposes the compressive force. By this countermeasure, the generation of wrinkles on the inner peripheral surface of the hose 20 is suppressed.

  As apparent from FIG. 3, the convex portion 42 is fitted into the adjacent concave portion 44 via the partition wall 30 on the innermost side of the curve. In other words, the adjacent side edges 38 and 40 are engaged with each other. This engagement prevents the reinforcing body 24 from protruding in the radial direction from the row. In the hose 20, the generation of wrinkles on the inner peripheral surface is suppressed.

  As described above, the reinforcing body 24 is flat. In the hose 20 having this reinforcing body 24, wrinkles are less likely to occur when bent. In this respect, the ratio of the width W to the thickness T (W / T) is preferably equal to or greater than 1.5, and particularly preferably equal to or greater than 2.0. This ratio (W / T) is preferably 5.0 or less. In this embodiment, the ratio (W / T) is 3.5. The thickness T and the width W are measured in a state where no load is applied to the hose 20. In other words, the thickness T and the width W are measured while the hose 20 is not stretched, contracted, or bent.

  In FIG. 2, an arrow L indicates a distance between the first side edge 38 of the reinforcing body 24 and the second side edge 40 adjacent to the first side edge 38. The distance L is measured along the axial direction. The distance L is smaller than the thickness T of the reinforcing body 24. The reinforcing body 24 having a small distance L is not easily displaced in the axial direction. From the viewpoint of suppressing deviation, the ratio of the distance L to the thickness T (L / T) is preferably 0.5 or less. From the viewpoint of securing the space S to such an extent that air easily moves when bent and the internal pressure of the space S does not hinder the expansion and contraction of the space S, this ratio (L / T) is 0. One or more is preferred. The distance L is measured in a state where no load is applied to the hose 20. In other words, the distance L is measured with the hose 20 not stretched, contracted, or bent.

  FIG. 4 shows an example of a method for manufacturing the hose 20 of FIG. The device 48 used for the production includes a forming shaft 50. The hose 20 is manufactured by spirally winding the material around the forming shaft 50. This device 48 is known. A manufacturing method in which the device 48 is used is referred to as a “spiral method”.

  In the manufacturing method using the apparatus 48 shown in FIG. 4, the soft resin composition is extruded in a semi-molten state, and the thin tape 52 is obtained. The thin tape 52 is supplied to the device 48 and wound on the forming shaft 50 in a spiral shape. The width Wt of the thin tape 52 is sufficiently large with respect to the helical pitch P (see FIG. 1). Therefore, the thin tape 52 is wound while being stacked several times. The ratio of the width Wt to the pitch P (Wt / P) is preferably 3 or more and 10 or less. Since the thin-walled tape 52 is in a semi-molten state, the thin-walled tapes 52 are welded and integrated in the overlapped portion.

  On the other hand, the hard resin composition is extruded in a semi-molten state, and the strip 54 is obtained. The strip 54 is supplied to the device 48 while being cooled as appropriate to stabilize the shape. The strip 54 is spirally wound around the thin tape 52 that has already been wound so as to be sandwiched between the thin tapes 52. The spiral pitch of the strip 54 is the same as the spiral pitch of the thin tape 52. By this winding, the reinforcing body 24 is obtained.

  A thin tape 52 is further wound on the reinforcing body 24 while being stacked several times. Since the thin-walled tape 52 is in a semi-molten state, the thin-walled tapes 52 are welded and integrated in the overlapped portion. Of the thin tape 52, a portion inside the reinforcing body 24 forms an inner layer 26 (see FIG. 2), and a portion outside the reinforcing body 24 forms an outer layer 28. The winding of the thin tape 52 and the winding of the strip 54 are performed at the same time. Therefore, one thin tape 52 exists between the side edges 38 and 40 adjacent to each other. The partition wall 30 is formed from the single thin tape 52. The thin tape 52 and the strip 54 are solidified to obtain the hose 20 shown in FIG.

  Both the thin tape 52 and the strip 54 are supplied to the apparatus 48 in a semi-molten state. Even if the thin-walled tape 52 and the strip 54 are brought into contact with each other in this device 48, it is preferable to select a material that does not weld them to each other so that the hose wall 22 and the reinforcing body 24 are not bonded. An example of a preferred combination is a thin tape 52 based on a soft vinyl chloride resin and a strip 54 based on polypropylene.

  The hose may include a heat insulating layer, a sound deadening layer, a protective layer, and the like. The material constituting the hose wall 22 and the material constituting the reinforcing body 24 are coextruded to obtain a strip, and the hose may be manufactured by a spiral method using the strip.

  FIG. 5A shows a reinforcing body 56 of a flexible hose according to another embodiment of the present invention. The reinforcing body 56 has a spiral shape as in the reinforcing body 24 shown in FIGS. Although not shown, this hose also has a hose wall having an inner layer, an outer layer, and a partition wall. A reinforcing body 56 is embedded in the hose wall. The reinforcing body 56 has a first side edge 58 and a second side edge 60. The first side edge 58 has a convex portion 62. The second side edge 60 has a recess 64. When the hose is curved, the convex portion 62 engages with the adjacent concave portion 64. By this engagement, the protrusion of the reinforcing body 56 is suppressed. With this hose, wrinkles are less likely to occur when bent. The reinforcing body 56 is hollow. The hose provided with the hollow reinforcing body 56 is lightweight.

  FIG. 5 (b) shows a flexible hose reinforcement 66 according to still another embodiment of the present invention. The reinforcing body 66 is spiral like the reinforcing body 24 shown in FIGS. Although not shown, this hose also has a hose wall having an inner layer, an outer layer, and a partition wall. A reinforcing body 66 is embedded in the hose wall. The reinforcing body 66 has a first side edge 68 and a second side edge 70. The first side edge 68 has a convex portion 72. The second side edge 70 has a recess 74. When the hose is curved, the protrusion 72 engages with the adjacent recess 74. By this engagement, the protrusion of the reinforcing body 66 is suppressed. With this hose, wrinkles are less likely to occur when bent. The reinforcing body 66 includes two grooves 76. The groove 76 contributes to weight reduction of the hose. In the hose provided with the reinforcing body 66 having the groove 76, the groove 76 is preferably provided on the outer surface of the reinforcing body 66 from the viewpoint that the inner peripheral surface thereof is kept smooth.

  FIG. 5C shows a flexible hose reinforcing body 78 according to still another embodiment of the present invention. The reinforcing body 78 has a spiral shape like the reinforcing body 24 shown in FIGS. Although not shown, this hose also has a hose wall having an inner layer, an outer layer, and a partition wall. A reinforcing body 78 is embedded in the hose wall. The reinforcing body 78 has a first side edge 80 and a second side edge 82. The first side edge 80 has a convex portion 84. The second side edge 82 has a recess 86. When the hose is curved, the protrusion 84 engages the adjacent recess 86. By this engagement, the protrusion of the reinforcing body 78 is suppressed. With this hose, wrinkles are less likely to occur when bent. The reinforcing body 78 includes two protrusions 88. The protrusion 88 enhances the reinforcing effect of the reinforcing body 78. In the hose provided with the reinforcing body 78 having the ridge 88, the ridge 88 is preferably provided on the outer surface of the reinforcing body 78 from the viewpoint that the inner peripheral surface thereof is kept smooth.

  FIG. 5D shows a flexible hose reinforcement 90 according to still another embodiment of the present invention. The reinforcing body 90 has a spiral shape, like the reinforcing body 24 shown in FIGS. Although not shown, this hose also has a hose wall having an inner layer, an outer layer, and a partition wall. A reinforcing body 90 is embedded in the hose wall. The reinforcing body 90 has a first side edge 92 and a second side edge 94. The first side edge 92 has a convex portion 96. The cross-sectional shape of the convex portion 96 is an arc shape. The second side edge 94 has a recess 98. The cross-sectional shape of the recess 98 is arcuate. When the hose is curved, the convex portion 96 engages with the adjacent concave portion 98. By this engagement, the protrusion of the reinforcing body 90 is suppressed. With this hose, wrinkles are less likely to occur when bent. The reinforcing body according to the present invention does not necessarily have a flat cross-sectional shape. As shown in FIG. 5D, the reinforcing body 90 may have a cross-sectional shape having the same width and thickness. A hose provided with a reinforcing body having a non-flat cross-sectional shape is excellent in flexibility. In addition, the reinforcement body which has a flat cross-sectional shape from a viewpoint of the manufacture efficiency of a hose is preferable.

  FIG. 5 (e) shows a flexible hose reinforcement 100 according to still another embodiment of the present invention. The reinforcing body 100 has a spiral shape like the reinforcing body 24 shown in FIGS. Although not shown, this hose also has a hose wall having an inner layer, an outer layer, and a partition wall. A reinforcing body 100 is embedded in the hose wall. The reinforcing body 100 has a first side edge 102 and a second side edge 104. The first side edge 102 has two convex portions 106. The second side edge 104 has two recesses 108. When the hose is curved, each protrusion 106 engages an adjacent recess 108. By this engagement, the protrusion of the reinforcing body 100 is suppressed. With this hose, wrinkles are less likely to occur when bent.

  FIG. 5 (f) shows a flexible hose reinforcement 110 according to still another embodiment of the present invention. The reinforcing body 110 has a spiral shape like the reinforcing body 24 shown in FIGS. Although not shown, this hose also has a hose wall having an inner layer, an outer layer, and a partition wall. A reinforcing body 110 is embedded in the hose wall. The reinforcing body 110 has a first side edge 112 and a second side edge 114. The first side edge 112 has two convex portions 116 and a concave portion 118. The second side edge 114 also has two convex portions 116 and a concave portion 118. When the hose is curved, the protrusion 116 engages the adjacent recess 118. By this engagement, the protrusion of the reinforcing body 110 is suppressed. When engaged, the reinforcing body 110 is slightly separated from the adjacent reinforcing body 110 in the radial direction. However, since the convex portion 116 and the concave portion 118 are engaged with each other, the reinforcing body 110 does not protrude significantly from the row like the reinforcing body 6 shown in FIG. With this hose, wrinkles are less likely to occur when bent.

  FIG. 6 is a cross-sectional view illustrating a part of a flexible hose 120 according to still another embodiment of the present invention. The hose 120 includes a hose wall 122, a first reinforcing body 124, and a second reinforcing body 126. In the cross section of FIG. 6, the first reinforcing bodies 124 and the second reinforcing bodies 126 are alternately arranged along the axial direction. The hose 120 can be formed by a double spiral method.

  This hose wall 122 is cylindrical like the hose wall 22 shown in FIG. The hose wall 122 has an inner layer 128, an outer layer 130, and a partition wall 132. The 1st reinforcement body 124 and the 2nd reinforcement body 126 are each helical. The first reinforcing body 124 and the second reinforcing body 126 are embedded in the hose wall 122. A space S is formed between the partition wall 132 and the first reinforcing body 124. A space S is also formed between the partition wall 132 and the second reinforcing body 126. The hose wall 122 is made of a soft resin composition. The first reinforcing body 124 and the second reinforcing body 126 are each made of a hard resin composition. The first reinforcing body 124 is not joined to the hose wall 122. The second reinforcing body 126 is also not joined to the hose wall 122.

  The first reinforcing body 124 includes a first side edge 134 and a second side edge 136. The first side edge 134 has a convex portion 138. The second side edge 136 also has a convex portion 138. The second reinforcing body 126 includes a third side edge 140 and a fourth side edge 142. The third side edge 140 has a recess 144. The fourth side edge 142 also has a recess 144. When the hose 120 is curved, the convex portion 138 engages with the adjacent concave portion 144. By this engagement, the protrusion of the first reinforcing body 124 and the second reinforcing body 126 is suppressed. With this hose 120, wrinkles are less likely to occur when bent.

  The hose according to the present invention can also be used as a ventilation duct, an air conditioning duct, a ventilation duct, and the like. This hose can also be used as a protective tube for electrical cables, communication cables and the like.

20, 120 ... Flexible hose 22, 122 ... Hose wall 24, 56, 66, 78, 90, 100, 110 ... Reinforcement body 26, 128 ... Inner layer 28, 130 ... Outer layer 30, 132 ... partition wall 32 ... housing part 38, 58, 68, 80, 92, 102, 112, 134 ... first side edge 40, 60, 70, 82, 94, 104, 114, 136 ... Second side edge 42, 62, 72, 84, 96, 106, 116, 138 ... Convex part 44, 64, 74, 86, 98, 108, 118, 144 ... Concave part 52 ...・ Thin tape 54 ... Strip 124 ... First reinforcement 126 ... Second reinforcement 140 ... Third side edge 142 ... Fourth side edge

Claims (6)

A cylindrical hose wall, and a reinforcing body embedded in the hose wall and spirally wound,
The flexible hose which has the convex part and / or recessed part which the side edge of the said reinforcement body can engage with an adjacent side edge.   The flexible hose according to claim 1, wherein the hose wall is molded from a resin composition, and the reinforcing body is molded from a resin composition harder than the resin composition of the hose wall.   The flexible hose according to claim 1 or 2, wherein the reinforcing body is not joined to the hose wall.   The flexible hose according to any one of claims 1 to 3, wherein one side edge of the reinforcing body has a convex portion and the other side edge has a concave portion.   The flexible hose according to any one of claims 1 to 4, wherein an axial distance between a side edge of the reinforcing body and a side edge adjacent to the side edge is smaller than a radial thickness of the reinforcing body. .   The hose wall has an inner layer, an outer layer, and a partition wall. The partition wall extends from the inner layer to the outer layer. The flexible hose according to claim 1, wherein a space is formed between the partition wall and the reinforcing body.

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