JP2007078323A - Duct hose - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a duct hose capable of improving sound absorption performance while suppressing windage loss by forming an approximate smooth duct inner surface and reducing a thickness of a duct wall. <P>SOLUTION: The duct hose comprises an inner layer 1 formed in an approximately straight cylinder shape, a reinforced core material 6 adhered on an outer circumferential surface of the inner layer 1, and a sound absorbing layer 2 laminated on an outer side of the inner layer 1. The sound absorbing layer 2 is formed by winding a flexible and elastic band like material 20 in a spiral shape around the outer circumferential surface of the inner layer 1, and abutting adjacent end edge parts with each other. The band like material 20 of the sound absorbing layer is pressed in a hose radial outward direction by the reinforced core material 6, and thereby, air gaps 21.. for sound absorption are formed between the inner layer 1 and the sound absorbing layer 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a duct hose that is used, for example, for sending and exhausting air conditioning equipment in a house or a building.

  Conventionally, in a duct hose for air supply / exhaust, noise reduction measures have been taken such that noise from a blower source is attenuated as much as possible inside the duct to prevent propagation into the room. As this type of duct hose, a structure having a sound absorbing layer made of resin foam, nonwoven fabric, glass wool or the like is generally widely known, but in order to further improve sound absorbing performance, the inner circumference of the sound absorbing layer is known. In some cases, irregularities are formed on the surface (for example, see Patent Document 1), or an uneven aluminum foil layer having air permeability is provided on the inner peripheral surface side of the sound absorbing layer (for example, see Patent Document 2).

JP 58-217889 A JP-A-9-217955

  However, the duct hoses disclosed in Patent Document 1 and Patent Document 2 have a problem in that irregularities are exposed on the inner surface of the duct, and windage loss increases during exhaust and exhaust. Further, when a separate member such as an aluminum foil layer is provided on the inner peripheral surface side of the sound absorbing layer, there is a problem that the wall thickness of the duct is increased, and the inner diameter of the duct is reduced or the outer diameter of the duct is increased.

  The present invention has been made in order to solve the above-mentioned conventional drawbacks, and its purpose is to substantially smooth the inner surface of the duct to suppress windage loss and to reduce the sound absorption performance while reducing the wall thickness of the duct. It is to provide a duct hose that can be enhanced.

  In order to solve the above-described problems, the duct hose of the present invention includes an inner layer 1 formed in a substantially straight cylindrical shape, a reinforcing core member 6 fixed in a spirally wound state on the outer peripheral surface of the inner layer 1, and the inner layer 1 The outer layers 2, 4 are laminated on the outer surface of the inner layer 1 by spirally winding the strips 20, 30 having flexibility and elasticity. The adjacent edge portions are abutted against each other, and for example, the intermediate portion in the width direction of the strips 20 and 30 of the outer layers 2 and 4 is pushed outward by the reinforcing core member 6 in the hose diameter outward direction. A sound absorbing gap 21 is formed between the inner layer 1 and the outer layers 2 and 4.

  Specifically, the reinforcing core member 6 includes a main reinforcing core 10 that has a large amount of protrusion in the hose diameter outward direction, and a secondary reinforcing core 11 that has a small amount of protrusion in the hose diameter outward direction, For example, intermediate portions in the width direction of the strips 20 and 30 of the outer layers 2 and 4 are pushed outward by the main reinforcing core 10 in the hose diameter outward direction to form a sound absorbing gap 21.

  Further, the auxiliary reinforcing core 11 enters between the adjacent edge portions of the strips 20 and 30 of the outer layers 2 and 4.

  Further, the reinforcing core member 6 includes linear reinforcing cores 12 and 12 with a protruding amount in the outer hose diameter direction smaller than that of the auxiliary reinforcing core 11, and the linear reinforcing cores 12 and 12 are connected to the main reinforcing cores 12 and 12, respectively. The reinforcing core 10 and the auxiliary reinforcing core 11 are disposed.

  Further, the outer layers 2 and 4 are made of the sound absorbing layer 2 or the heat insulating layer 4, and the strips 20 and 30 are made of a resin foam having an open cell structure or a closed cell structure.

  Further, irregularities 40 are formed on the inner peripheral surfaces of the outer layers 2 and 4. Further, the inner layer 1 is formed by spirally winding a strip-shaped nonwoven fabric 9 or woven fabric having air permeability, and the reinforcing core member 6 is fixed across the outer peripheral surfaces of the adjacent edge portions. .

  In the duct hose of the present invention, an outer layer is laminated on the outer side of the substantially straight inner layer, and a space for absorbing sound by pressing a reinforcing core material fixed to the outer peripheral surface of the inner layer is formed between the inner layer and the outer layer. Forming. Therefore, the inner wall of the duct is kept substantially smooth to suppress wind loss during sending and exhausting, and the wall thickness of the duct can be reduced compared to the case where a gap forming member is separately provided on the inner peripheral side of the sound absorbing layer. However, the sound absorbing performance can be enhanced by effectively attenuating noise by the sound absorbing gap.

  In particular, by pushing the outer layer with the main reinforcing core that protrudes outward in the hose diameter direction, it is possible to reliably secure a sound-absorbing gap and to stably exhibit good sound-absorbing performance.

  Moreover, the positional offset of a strip | belt-shaped material etc. can be prevented by inserting a sub reinforcement core between the adjacent edge parts of the strip | belt-shaped material of an outer side layer. Furthermore, by arranging the linear reinforcing core between the main reinforcing core and the auxiliary reinforcing core, it is possible to reliably prevent the inner layer from being bent in the hose diameter inward direction. By these, the shape retention property of a duct can be improved, the space | gap for sound absorption can be maintained favorable, and sound absorption performance can be improved further.

  Furthermore, by forming a sound absorbing gap on the inner peripheral side of the sound absorbing layer, the sound absorbing performance of the sound absorbing layer can be added to the sound absorbing performance of the sound absorbing layer itself, so that the sound absorbing performance of the sound absorbing layer is further improved. be able to. In addition, by forming a sound-absorbing gap on the inner peripheral side of the heat-insulating layer and exhibiting excellent sound-absorbing performance in the heat-insulating layer, for example, in a duct hose that requires both sound-absorbing and heat-insulating functions, Even if it is abolished, both functions can be achieved with only the heat insulating layer, the wall thickness of the duct can be significantly reduced, and the cost reduction associated with the reduction in the number of parts can be realized.

  Furthermore, by forming irregularities on the inner peripheral surface of the outer layer, it is possible to promote the diffusion and reflection of noise in the sound-absorbing gap, thereby further improving the sound-absorbing performance.

  Next, embodiments of the present invention will be described in detail with reference to the drawings. A duct hose according to an embodiment of the present invention is connected to an air supply / exhaust port of an air conditioner such as a house or a building, or connected to an air supply / exhaust port of a ventilator, and is used for air supply / exhaust to these air conditioning equipment. Is done.

  As shown in FIGS. 1 to 3, the duct hose has a structure in which an inner layer 1, a sound absorbing layer 2 as an outer layer, an intermediate layer 3, a heat insulating layer 4, and an outer layer 5 are laminated in order from the inner side.

  The inner layer 1 is formed in a substantially straight cylindrical shape by, for example, winding a belt-shaped nonwoven fabric 9 having air permeability into a spiral shape. In forming the inner layer 1, not only the nonwoven fabric but also a woven fabric having air permeability, for example, may be used.

  On the outer peripheral surface of the inner layer 1, a reinforcing core member 6 made of, for example, an extruded product made of polypropylene is fixed, and the inner layer 1 and the reinforcing core member 6 are integrated. Thereby, the inner layer 1 is maintained in a substantially straight cylindrical shape, and the inner peripheral surface and the outer peripheral surface thereof are maintained substantially smooth.

  The reinforcing core material 6 is spirally wound along the central portion in the width direction of the belt-shaped nonwoven fabric 9 in the inner layer 1 and is heat-sealed to the outer peripheral surface of the central portion. The sub-reinforcing cores 11 having a substantially convex cross section, spirally wound between the edge portions of the adjacent strip-shaped nonwoven fabric 9, and heat-sealed between the outer peripheral surfaces of the edge portions; Linear reinforcing cores 12 and 12 having a substantially circular cross section are provided which are spirally wound between the main reinforcing core 10 and the sub reinforcing core 11 and are heat-sealed to the outer peripheral surface of the strip-shaped nonwoven fabric 9. The main reinforcing core 10, the auxiliary reinforcing core 11, and the linear reinforcing cores 12 and 12 are heat-sealed to the outer peripheral surface of the inner layer 1 by heat of fusion at the time of extrusion molding. The main reinforcing core 10 is heat-sealed between the outer peripheral surfaces of the edge portions of the adjacent nonwoven fabrics 9, and the sub-reinforcing core 11 is heat-sealed to the outer peripheral surface of the central portion in the width direction of the nonwoven fabric 9. Also good.

  And the height of the main reinforcement core 10 is the highest, and the height becomes small in order of the sub reinforcement core 11 and the linear reinforcement cores 12 and 12. That is, the amount of the main reinforcing core 10 protruding outward in the hose diameter direction is large, the amount of the auxiliary reinforcing core 11 protruding outward in the hose diameter direction is small, and the linear reinforcing cores 12 and 12 extend outward in the hose diameter direction. The overhanging amount is smaller than that of the main reinforcing core 10 and the auxiliary reinforcing core 11.

  The sound-absorbing layer 2 is formed by, for example, winding a sound-absorbing belt-like material 20 having a substantially rectangular cross section in a spiral shape around the outer peripheral surface of the inner layer 1 and abutting adjacent edge portions with each other. It is formed in a substantially straight cylindrical shape. As the sound absorbing band-like material 20 of the sound absorbing layer 2, for example, a soft resin foam having an open cell structure made of urethane foam or a soft resin foam having a closed cell structure made of foamed polyethylene or the like is used. Further, as the sound absorbing band-like material 20, a non-woven fabric or the like may be used in addition to such a soft resin foam. Note that the sound-absorbing belt-like material 20 that is spirally wound is not limited to a substantially rectangular cross section, and may be, for example, a substantially rhombic cross section or a substantially parallelogram cross section.

  Then, on the inner peripheral side of the sound absorbing layer 2, the central portion in the width direction of the sound absorbing strip 20 is pushed outward by the tip of the main reinforcing core 10, and the sound absorbing strip 20 is elastically deformed while the hose diameter is being elastically deformed. By being lifted slightly outward, a sound absorbing gap 21 is formed between the outer peripheral surface of the inner layer 1 and the inner peripheral surface of the sound absorbing layer 2. When the amount of the main reinforcing core 10 protruding outward in the hose diameter direction is relatively large, as shown in FIG. 3, gaps 21 are formed so as to extend to both sides of the main reinforcing core 10. However, when the amount of the main reinforcing core 10 projecting outward in the hose diameter direction is relatively small, both sides sandwiching the main reinforcing core 10 are almost filled with the sound-absorbing belt-like material 20 as shown in FIG. . Therefore, if the projecting amount of the main reinforcing core 10 in the outer diameter direction of the hose is increased, the gaps 21 can be reliably formed and the sound absorbing performance can be improved.

  Further, the auxiliary reinforcing core 11 is embedded between the adjacent edge portions of the sound absorbing band-like material 20. Further, the linear reinforcing cores 12 and 12 are pressed between the central portion in the width direction of the sound absorbing belt-like material 20 and the edge portion.

  As described above, since the reinforcing core member 6 is digged into the inner peripheral surface of the sound absorbing layer 2, it is possible to prevent the sound absorbing layer 2 from being displaced, twisted, and the like, and the main reinforcement that protrudes most outward in the hose diameter direction. Since the air gap 21 for sound absorption is formed by pushing the core 10, the wall thickness of the duct is kept small compared to when a member for air gap formation is separately provided on the inner peripheral side of the sound absorption layer 2. It is possible to ensure the sound absorbing gaps 21.

  The intermediate layer 3 is formed by, for example, winding a soft resin tape 22 in a spiral shape and heat-sealing adjacent edge portions thereof. The intermediate layer 3 is not necessarily provided, and may be eliminated depending on circumstances.

  The heat insulating layer 4 is formed by, for example, winding a heat-insulating strip 30 having a substantially rectangular cross section and having flexibility and elasticity on the outer peripheral surface of the intermediate layer 3 in a spiral manner, and abutting adjacent edge portions with each other. Thus, it is formed in a substantially straight cylindrical shape. As the heat insulating strip-like material 30 of the heat insulating layer 4, for example, a soft resin foam having a closed cell structure made of foamed polyethylene or the like is used. In addition, the thickness of the heat insulating layer 4 in the hose radial direction is formed thinner than the thickness of the sound absorbing layer 2 in the hose radial direction. Moreover, the heat insulation strip | belt-shaped material 30 wound spirally is not restricted to a thing with a cross-sectional substantially rectangular shape, For example, the thing of a cross-sectional substantially rhombus or a cross-section substantially parallelogram may be used.

  The abutting portion between the end edges of the heat insulating strip 30 in the heat insulating layer 4 is in a state shifted in the hose axial direction with respect to the abutting portion between the end edges of the sound absorbing strip 20 in the sound absorbing layer 2. As a result, the abutting portion of the sound absorbing band-like material 20 of the sound absorbing layer 2 can be closed, and the sound absorbing performance can be improved.

  Then, on the inner peripheral side of the heat insulating layer 4, a narrow adhesive tape made of, for example, an ethylene vinyl acetate copolymer (EVA) spirally wound between adjacent edge portions of the heat insulating strip 30. 31 is heat-sealed between these edge portions and the outer peripheral surface of the intermediate layer 3. Thereby, the adjacent edge parts of the heat insulation strip 30 are adhered, and the heat insulation layer 4 and the intermediate layer 3 are adhered.

  In this way, by joining the end edges of the heat insulating strip 30 with the adhesive tape 31, for example, even when the hose is bent, the butted portion between the end edges of the heat insulating strip 30 opens, There is no gap between the end edges, and the heat insulation layer 4 maintains good heat insulation performance.

  The outer layer 5 is formed by, for example, winding a soft resin tape 35 in a spiral shape and heat-sealing the adjacent edge portions. The outer layer 5 is bonded to the heat insulating layer 4 via a narrow adhesive tape 36 made of, for example, EVA wound spirally on the outer peripheral surface side of the heat insulating layer 4. Providing such an outer layer 5 suppresses deterioration and damage of the heat insulating layer 4 and enhances heat insulating performance.

  When the duct hose having the above configuration is connected to the air supply / exhaust port of the air conditioning equipment, when noise from the blower enters the duct, the noise is first attenuated by interfering with the inner layer 1 while propagating inside the duct. Is done. Further, the noise that has passed through the inner layer 1 and entered the sound absorbing gap 21... Is attenuated by repeatedly diffusing and reflecting in the gap 21. Furthermore, noise that has entered the sound absorbing layer 2 from the air gaps 21 is attenuated inside the sound absorbing layer 2. Therefore, the noise that has entered the duct is efficiently attenuated by the inner layer 1, the sound absorbing layer 2, and the sound absorbing gap 21 formed between them, and is silenced before reaching the opening on the indoor side of the duct hose. be able to.

  In general, an open-cell structure resin foam has a higher sound absorption performance than a closed-cell structure resin foam, but even when a closed-cell structure resin foam is used as the sound-absorbing band-like material 20 of the sound-absorbing layer 2. It has been experimentally found that the sound absorption performance is higher than that of a structure in which an open cell resin foam is simply spirally wound without forming a void. Therefore, even if a closed cell structure resin foam is used as the sound absorbing band-like material 20 of the sound absorbing layer 2, a duct hose excellent in sound absorbing performance can be configured.

  FIG. 5 shows a modification of the sound absorbing layer 2 in the duct hose. In the duct hose according to this embodiment, for example, embossed irregularities 40 are formed on the inner peripheral surface of the sound absorbing layer 2, thereby promoting the diffusion and reflection of noise in the air gaps 21. Can be further increased. The unevenness 40 is not limited to the embossed shape, and may be configured by forming a plurality of grooves on the inner peripheral surface of the sound absorbing layer 2, for example. Other configurations are the same as those in the above embodiment, and members having the same functions as those in the above embodiment are denoted by the same reference numerals.

  FIG. 6 shows a duct hose according to another embodiment. In the duct hose according to this embodiment, the outer layer laminated on the outer side of the inner layer 1 is composed of the heat insulating layer 4, and the sound absorbing layer 2 and the intermediate layer 3 are abolished.

  And in the inner peripheral surface side of the heat insulation layer 4, the center part of the heat insulation strip | belt-shaped material 30 in the width direction is pushed into the hose diameter outward direction by the front-end | tip part of the main reinforcement core 10, and a hose diameter is elastically deforming the heat insulation strip | belt-shaped material 30. By being lifted slightly outward, a sound absorbing gap 21 is formed between the outer peripheral surface of the inner layer 1 and the inner peripheral surface of the heat insulating layer 4. Note that, when the amount of the main reinforcing core 10 protruding outward in the hose diameter direction is relatively small, both sides sandwiching the main reinforcing core 10 are substantially filled with the heat insulating strip 30 as shown in FIG. .

  Further, the auxiliary reinforcing core 11 is embedded between the adjacent edge portions of the heat insulating strip 30. Further, the linear reinforcing cores 12 and 12 are pushed between the center part in the width direction of the heat insulating strip 30 and the edge part.

  Also in this duct hose, as shown in FIG. 8, the unevenness | corrugation 40 may be formed in the internal peripheral surface of the heat insulation layer 4. As shown in FIG. In addition, the other structure is the same as that of the said embodiment, and the same code | symbol is attached | subjected about the member which has the same function as the said embodiment.

  In this way, the sound absorbing layer 2 is abolished by forming the sound absorbing air gap 21... By pushing the main reinforcing core 10 on the inner surface side of the heat insulating layer 4 and providing the heat insulating layer 4 with a sound absorbing function. In addition, excellent sound absorption performance can be exhibited, the wall thickness of the duct can be further reduced, and the number of parts can be reduced to reduce the cost.

  Although specific embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made within the scope of the present invention. For example, the outer layer laminated on the outer side of the inner layer of the duct hose is not limited to the sound absorbing layer and the heat insulating layer as in the above embodiment, and may have a function other than the sound absorbing function and the heat insulating function. Further, in the above embodiment, the sound absorbing gap is formed by pushing the central portion in the width direction of the band-like material in the sound-absorbing layer or the heat-insulating layer as the outer layer with the main reinforcing core, but for example, the width of the band-like material A space for absorbing sound may be formed by pushing a position shifted from the central portion in the direction with the main reinforcing core. Furthermore, as shown in FIGS. 9 and 10, the auxiliary reinforcing core may be eliminated and the reinforcing core material may be configured by the main reinforcing core and the linear reinforcing core.

It is a partial fracture perspective view of a duct hose concerning one embodiment of this invention. It is the partially broken side view similarly. It is the same partial expanded sectional view. It is a partial expanded sectional view which shows the space | gap when the amount of protrusion of the main reinforcement core to the hose diameter outward direction is comparatively small. It is a partial expanded sectional view which shows the modification of the sound absorption layer in a duct hose. It is a partial expanded sectional view of a duct hose concerning another embodiment. It is a partial expanded sectional view which shows the space | gap when the amount of protrusion of the main reinforcement core to the hose diameter outward direction is comparatively small. It is a partial expanded sectional view which shows the modification of the heat insulation layer in a duct hose. It is a partial expanded sectional view of the duct hose which abolished the auxiliary reinforcement core. It is a partial expanded sectional view of the duct hose which abolished the auxiliary reinforcement core.

Explanation of symbols

  1 .... Inner layer, 2 .... Sound absorbing layer (outer layer), 4 .... Heat insulation layer (outer layer), 6 .... Reinforcement core material, 9 .... Strip-shaped non-woven fabric, 10 .... Main reinforcement core, ... Reinforcing core, 12 .... Linear reinforcing core, 20 .... Sound-absorbing band material, 21 .... Sound-absorbing gap, 30 .... Heat-insulating band material, 40 .... Uneven surface

Claims (8)

An inner layer (1) formed in a substantially straight cylindrical shape, a reinforcing core (6) fixed in a spirally wound state on the outer peripheral surface of the inner layer (1), and an outer layer laminated on the outer side of the inner layer (1) Layers (2) and (4), and the outer layers (2) and (4) are spiral and flexible strips (20) and (30) on the outer peripheral surface of the inner layer (1). The adjacent edge portions are butted against each other, and the strips (20) and (30) of the outer layers (2) and (4) are hose radially outward by the reinforcing core (6). A duct hose characterized in that a sound-absorbing space (21) is formed between the inner layer (1) and the outer layer (2) (4). An inner layer (1) formed in a substantially straight cylindrical shape, a reinforcing core (6) fixed in a spirally wound state on the outer peripheral surface of the inner layer (1), and an outer layer laminated on the outer side of the inner layer (1) Layers (2) and (4), and the reinforcing core member (6) includes a main reinforcing core (10) having a large protruding amount outward in the hose diameter direction and a small protruding amount in the hose diameter outward direction. The outer layer (2) (4) has a flexible and elastic band-like material (20) (30) on the outer peripheral surface of the inner layer (1). It is wound in a spiral shape and its adjacent edge portions are butted against each other. The strips (20) and (30) of the outer layers (2) and (4) are separated from the hose diameter by the main reinforcing core (10). The sound-absorbing gap (21) is formed between the inner layer (1) and the outer layer (2) (4) by pushing in the direction. Duct hose to the butterflies. The duct hose according to claim 2, wherein the auxiliary reinforcing core (11) enters between adjacent edge portions of the strips (20) (30) of the outer layer (2) (4). The reinforcing core member (6) includes linear reinforcing cores (12) and (12) that have a smaller amount of protrusion in the hose diameter outward direction than the auxiliary reinforcing core (11). The duct hose according to claim 2 or 3, wherein (12) is disposed between the main reinforcing core (10) and the auxiliary reinforcing core (11). 5. The sound absorbing space (21) is formed by pressing a width direction intermediate portion of the strips (20) (30) of the outer layer (2) (4). The described duct hose. The outer layer (2) (4) comprises a sound absorbing layer (2) or a heat insulating layer (4), and the strips (20) (30) comprise a resin foam having an open cell structure or a closed cell structure. Item 6. The duct hose according to any one of Items 1 to 5. The duct hose according to any one of claims 1 to 6, wherein irregularities (40) are formed on an inner peripheral surface of the outer layer (2) (4). The inner layer (1) is formed by spirally winding a strip-shaped nonwoven fabric (9) or woven fabric having air permeability, and straddles the reinforcing core (6) across the outer peripheral surfaces of the adjacent edge portions. The duct hose according to any one of claims 1 to 7, which is fixed.