JP2008096073A - Duct hose - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a duct hose capable of improving sound absorbing performance more effectively while suppressing windage loss by substantially smoothing a duct inner face. <P>SOLUTION: The duct hose is provided with an inner layer 1 substantially formed like a straight tube and having air permeability, a sound absorbing layer 2 laminated on an outer side of the inner layer 1, a heat insulating layer 4 laminated on an outer side of the sound absorbing layer 2, and an outer layer 5 laminated on an outer side of the heat insulating layer 4. By forming uneven parts 21 on an inner circumference face of the sound absorbing layer 2, voids 22 for sound absorption are secured between the inner layer 1 and the sound absorbing layer 2. <P>COPYRIGHT: (C)2008,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 foamed resin body, nonwoven fabric, glass wool or the like is generally widely known, but in order to further improve the sound absorbing performance, the inner circumference of the sound absorbing layer is known. By forming irregularities on the surface, the surface area of the inner peripheral surface of the sound absorbing layer is increased (see, for example, 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. In some cases, a sound-absorbing gap is provided between the sound-absorbing layer and the aluminum foil layer (see, for example, 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 the inner surface of the duct is uneven, and windage is increased during air supply and exhaust.

  Furthermore, in the duct hose disclosed in Patent Document 1, only the surface area of the inner peripheral surface of the sound absorbing layer is enlarged, and in the duct hose disclosed in Patent Document 2, uneven aluminum is used. Although a foil layer is provided to secure a sound-absorbing gap, the sound-absorbing layer itself has not been devised to enhance the sound-absorbing effect. There was room.

  The present invention has been made to solve the above-mentioned conventional drawbacks, and its purpose is to make the duct inner surface substantially smooth to suppress windage loss and to further improve the sound absorption performance more effectively. Is to provide a hose.

  In order to solve the above-mentioned problems, a duct hose of the present invention includes a breathable inner layer 1 formed in a substantially cylindrical shape, and outer layers 2 and 4 having a sound absorbing property and / or heat insulation laminated on the outer side of the inner layer 1. And an uneven portion 21 is formed on the inner peripheral surface of the outer layers 2 and 4 to secure a sound absorbing gap 22 between the inner layer 1 and the outer layers 2 and 4.

  Specifically, the concavo-convex portion 21 is formed by performing profile processing over substantially the entire inner peripheral surface of the outer layers 2 and 4. The inner layer 1 is formed by winding a strip-shaped fibrous material 9 made of a nonwoven fabric or a woven fabric in a spiral shape and directly or indirectly joining the adjacent edge portions.

  Furthermore, the outer layer 2 is formed by spirally winding a band-shaped foamed resin material 20 having an open cell structure along the outer peripheral surface of the inner layer 1 and abutting adjacent edge portions thereof. Further, the outer layer 4 is formed by winding a band-shaped foamed resin material 30 having a closed cell structure spirally along the outer peripheral surface of the inner layer 1 and abutting adjacent edge portions thereof.

  Furthermore, the inner layer 1 is reinforced by attaching a reinforcing core member 6 wound spirally around the outer peripheral surface of the inner layer 1.

  In the duct hose according to the present invention, the outer layer is laminated on the outer side of the substantially straight inner layer, the uneven portion is formed on the inner peripheral surface of the outer layer, and the sound absorbing gap is formed between the inner layer and the outer layer. Therefore, the noise propagating inside the duct can be attenuated by guiding it from the inner layer into the sound-absorbing gap while keeping the inner surface of the duct substantially smooth and suppressing windage loss during sending and exhausting. The sound absorption performance can be improved. In addition, by forming the concavo-convex portion, the outer layer is easily bent, and the flexibility of the hose as a whole can be improved.

  In particular, when the outer layer is a sound-absorbing layer having a sound-absorbing property, noise is efficiently attenuated by both the sound-absorbing layer whose inner peripheral surface area is enlarged by the concavo-convex part and the sound-absorbing gap, thereby further improving the sound-absorbing performance It can be improved effectively.

  Further, when the outer layer is a heat insulating layer having heat insulating properties, the sound absorbing performance can be maintained well by the sound absorbing gap while the heat insulating performance is maintained well by the heat insulating layer. In general, in the duct hose where both the performance of sound absorption and heat insulation is required, it has a structure in which a sound absorption layer and a heat insulation layer are laminated, but by ensuring a space for sound absorption inside the heat insulation layer in this way, Even if the sound absorbing layer is eliminated, it is possible to maintain both the sound absorbing and heat insulating performances, which makes it possible to significantly reduce the wall thickness of the duct and reduce the number of parts.

  Furthermore, when the concavo-convex portion is formed over substantially the entire inner peripheral surface of the outer layer, a sound absorbing gap is ensured over substantially the entire length of the hose, and the sound absorbing performance is uneven over substantially the entire length of the hose. And can be exhibited well. Furthermore, by constituting the inner layer with the spirally wound fibrous material, noise can be attenuated by the inner layer itself, and the sound absorbing performance can be further enhanced.

  Further, by reinforcing the inner layer with the reinforcing core material, the shape retaining property of the duct can be improved, and a sound absorbing space can be secured well, and the sound absorbing performance can be further improved.

  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, this 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 strip-shaped fibrous material 9 made of a non-woven fabric having air permeability into a spiral shape. In addition, as the fibrous material 9 which comprises the inner layer 1, you may make it use not only a nonwoven fabric but the woven fabric which has air permeability, for example.

  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 member 6 is spirally wound between the edge portions of adjacent strip-like fibrous materials 9 in the inner layer 1 and is heat-sealed across the outer peripheral surfaces of these edge portions. A convex main reinforcing core 10 and a sub-reinforcing core having a substantially convex cross section wound spirally along the widthwise central portion of the belt-like fibrous material 9 and thermally fused to the outer peripheral surface of the central portion. 11 and linear reinforcing cores 12 and 12 having a substantially circular cross section that are spirally wound between the main reinforcing core 10 and the auxiliary reinforcing core 11 and are heat-sealed to the outer peripheral surface of the strip-like fibrous material 9. It has. 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 adjacent edge portions of the strip-shaped fibrous material 9 in the inner layer 1 are not only indirectly joined through the main reinforcing core 10 as described above, but also overlapped with each other without using the main reinforcing core 10. You may join directly so that it may match.

  In the reinforcing core member 6, the main reinforcing core 10 has the highest height, and the height of the auxiliary reinforcing core 11 and the linear reinforcing cores 12 and 12 decreases in this order. 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 reinforcing core member 6 is not necessarily provided, for example, as long as the inner layer 1 can be maintained in a substantially straight cylindrical shape by its own shape retention, and may be eliminated depending on circumstances.

  The sound absorbing layer 2 is formed by winding a sound absorbing foamed resin material 20 having a substantially rectangular cross section having flexibility and elasticity, for example, spirally along the outer peripheral surface of the inner layer 1, and adjoining edge portions thereof. By abutting each other, it is formed in a substantially straight cylindrical shape. As the sound-absorbing foam resin material 20 of the sound-absorbing layer 2, for example, a soft foam resin having an open cell structure made of foamed urethane or the like is used. In addition, as the sound-absorbing foamed resin material 20, a soft foamed resin that has a partly closed cell structure and is positively provided with heat insulation may be used. Further, the shape is not limited to a substantially rectangular cross section, and may be a substantially rhombic cross section or a substantially parallelogram cross section, for example.

  And the uneven | corrugated | grooved part 21 is formed in the internal peripheral surface of this sound absorption layer 2, and while this increases the surface area of the internal peripheral surface of the sound absorption layer 2, it is sound-absorbing between the inner layer 1 and the sound absorption layer 2. An air gap 22 is secured. The concavo-convex portion 21 is formed by profiling over almost the entire inner peripheral surface of the sound absorbing layer 2, that is, the inner surface of the sound absorbing foamed resin material 20, so that concave portions and convex portions are alternately arranged along the hose axial direction and the hose circumferential direction. It is formed to be continuous. Therefore, a sound absorbing gap 22 is secured over almost the entire length of the hose. In addition, as the uneven | corrugated | grooved part 21, you may be comprised by forming a some groove | channel in the internal peripheral surface of the sound absorption layer 2, for example.

  In addition, on the inner peripheral side of the sound absorbing layer 2, the main reinforcing core 10 enters between adjacent edge portions of the sound absorbing foamed resin material 20, and the sub reinforcing core 11 contacts the central portion in the width direction of the sound absorbing foamed resin material 20. The linear reinforcing cores 12 and 12 are in contact with each other between the central portion in the width direction of the sound-absorbing foamed resin material 20 and the edge portion.

  As described above, since the reinforcing core member 6 is interposed between the inner layer 1 and the sound absorbing layer 2, it is possible to prevent the positional shift or twist of the sound absorbing layer 2, and the uneven portion 21 of the sound absorbing layer 2. Crushing due to pressure contact with the inner layer 1 can be suppressed.

  The intermediate layer 3 is formed by, for example, winding a soft resin tape 25 in a spiral shape and heat-sealing the adjacent edge portions. The intermediate layer 3 is not necessarily provided, and may be eliminated depending on circumstances.

  The heat insulating layer 4 is formed by winding a heat insulating foamed resin material 30 having a substantially rectangular cross section having flexibility and elasticity, for example, spirally along the outer peripheral surface of the intermediate layer 3, and adjacent edge portions thereof. By mutually abutting each other, 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 foam resin having a closed cell structure made of foamed polyethylene or the like is used. In addition, as the heat insulating foamed resin material 30, a soft foamed resin may be used in which a part has an open-cell structure and positively absorbs sound. Further, the shape is not limited to a substantially rectangular cross section, and may be a substantially rhombic cross section or a substantially parallelogram cross section, for example.

  The abutting portion between the end edges of the heat insulating foamed resin material 30 in the heat insulating layer 4 is shifted in the hose axial direction with respect to the abutting portion between the end edges of the sound absorbing foamed resin material 20 in the sound absorbing layer 2. Thus, the butted portion of the sound absorbing foamed resin material 20 in the sound absorbing layer 2 and the butted portion of the heat insulating foamed resin material 30 in the heat insulating layer 4 are closed, and the sound absorbing performance and heat insulating performance are enhanced.

  Then, on the inner peripheral side of the heat insulating layer 4, for example, a narrow adhesive made of an ethylene vinyl acetate copolymer (EVA) spirally wound between adjacent edge portions of the heat insulating foamed resin material 30. The tape 31 is heat-sealed between the end edges and the outer peripheral surface of the intermediate layer 3. Thereby, the adjacent edge parts of the heat insulation foaming resin material 30 are adhere | attached, and it is in the state to which the heat insulation layer 4 and the intermediate | middle layer 3 were adhere | attached.

  Thus, by joining the end edges of the heat insulating foamed resin material 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 foamed resin material 30 is opened. The heat insulation layer 4 maintains good heat insulation performance without any gaps between the end edges.

  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 is guided to the sound absorbing gap 22 is attenuated by repeatedly diffusing and reflecting in the sound absorbing gap 22. Furthermore, the noise in the sound absorbing gap 22 is efficiently guided from the inner peripheral surface with an enlarged surface area to the inside of the sound absorbing layer 2 and attenuated in the sound absorbing layer 2. Therefore, the noise that has entered the duct can be attenuated efficiently by the inner layer 1, the sound absorbing layer 2, and the sound absorbing gap 22 formed between them, and can be silenced before reaching the indoor opening of the duct hose. it can.

  FIG. 4 shows a duct hose according to another embodiment. In this duct hose, the intermediate layer 3 and the heat insulating layer 4 are abolished, and the outer layer 5 is provided on the outer peripheral surface side of the sound absorbing layer 2. . Thus, by eliminating the heat insulating layer 4, the number of parts can be reduced while the wall thickness of the duct is significantly reduced. In addition, although the heat insulating layer 4 is abolished, heat insulating performance can be provided to some extent by the heat insulating effect by the sound absorbing gap 22. 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. 5 shows a duct hose according to another embodiment. In this duct hose, a heat insulating layer 4 is used instead of the sound absorbing layer 2 as an outer layer laminated on the outer side of the inner layer 1, and the sound absorbing layer 2 and Middle class 3 is abolished. And the uneven | corrugated | grooved part 21 is formed in the internal peripheral surface of the heat insulation layer 4, and the space | gap 22 for sound absorption is ensured between the inner layer 1 and the heat insulation layer 4 by this. Thus, by eliminating the sound absorbing layer 2, the number of parts can be reduced while the wall thickness of the duct is significantly reduced. Moreover, although the sound absorbing layer 2 is abolished, the sound absorbing performance can be favorably maintained by the sound absorbing gap 22. 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.

  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.

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 of the duct hose which concerns on other embodiment. It is a partial expanded sectional view of a duct hose concerning another embodiment.

Explanation of symbols

  1 .... Inner layer 2 .... Sound absorbing layer (outer layer) 4 .... Heat insulation layer (outer layer) 6 .... Reinforcement core material 9 .... Fiber material 20, ... Sound absorbing foam resin material 21, ... Concave and convex portions, 22 .. Sound absorption gap, 30 .. Insulating foam resin material

Claims (6)

A breathable inner layer (1) formed in a substantially straight cylindrical shape and a sound absorbing and / or heat insulating outer layer (2) (4) laminated on the outer side of the inner layer (1). (2) A concave and convex portion (21) is formed on the inner peripheral surface of (4), and a sound absorbing gap (22) is secured between the inner layer (1) and the outer layer (2) (4). A duct hose characterized by The duct hose according to claim 1, wherein the uneven portion (21) is formed by performing profile processing over substantially the entire inner peripheral surface of the outer layer (2) (4). The said inner layer (1) winds the strip | belt-shaped fiber material (9) which consists of a nonwoven fabric or a woven fabric helically, and joins the adjacent edge parts directly or indirectly, The said inner layer (1) is formed. Or the duct hose of 2. The outer layer (2) is formed by spirally winding a band-shaped foamed resin material (20) having an open-cell structure along the outer peripheral surface of the inner layer (1), and abutting adjacent edge portions with each other. The duct hose according to any one of claims 1 to 3. The outer layer (4) is formed by spirally winding a band-shaped foamed resin material (30) having a closed cell structure along the outer peripheral surface of the inner layer (1), and abutting adjacent edge portions with each other. The duct hose according to any one of claims 1 to 3. The duct hose according to any one of claims 1 to 5, wherein a reinforcing core member (6) wound spirally is attached to the outer peripheral surface of the inner layer (1) to reinforce the inner layer (1).