air conditioning ducts

Abstract

To provide an air conditioning duct capable of securing load bearing in a connection part of duct members.SOLUTION: A plurality of duct members 11 having a square cross section is formed by a heat insulating board 13 containing a hard foamed resin as a main material. An air conditioning duct 1 is manufactured by connecting these duct members 11 in a row. A connection part 11c between two adjacent duct members 11 is provided with connection means 20 including at least one of a nipple 21, caulking agents 41, 42, 43, an aluminum adhesive tape 22, and an aluminum glass cloth adhesive tape 24. When a vertical load is applied to the connection part 11c with the two duct members 11 supported by a pair of fulcrums 53 separated by a distance of 1820 mm across the connection part 11c, the two duct members 11 are connected to each other by the connection means 20 so that the connection part 11c has a withstand load of 1000 N or more.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to an air conditioning duct installed in a building, and more particularly to an air conditioning duct consisting of a plurality of duct members each having a rectangular cross section. [Background technology]

[0002] For example, Patent Document 1 discloses an air conditioning duct in which multiple duct members with rectangular cross sections are connected in a row via nipples. The duct member is made of four insulating boards made of hard foam resin assembled in a square shape. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-113265 Summary of the Invention [Problem to be solved by the invention]

[0004] In air conditioning ducts with the above structure, maintaining the joint between the duct members is important. Therefore, the joints must be able to withstand a certain load. However, the load-bearing capacity of this type of air conditioning duct has hardly been verified until now. In view of the above circumstances, an object of the present invention is to provide an air conditioning duct that can ensure load-bearing capacity at the joints between duct members. [Means for solving the problem]

[0005] In order to solve the above problem, the present invention provides an air conditioning duct provided in a building, a plurality of duct members each having a rectangular cross section formed from an insulating board containing a hard foam resin as a main material and joined together in a row; a joining means provided at a joining portion between two adjacent duct members, the joining means including at least one of a nipple, a caulking agent, an aluminum adhesive tape, and an aluminum glass cloth adhesive tape; The two duct members are joined together by the joining means so that when a vertical load is applied to the joint while the two duct members are supported by a pair of fulcrums separated by a fulcrum distance of 1820 mm on either side of the joint, the load-bearing capacity of the joint is 1000 N or more. The insulation board may contain a rigid foamed resin as a main material, and may have a protective layer such as an aluminum foil sheet on its surface. The rigid foamed resin constituting the main material preferably accounts for 80 wt % or more, more preferably 85 to 89 wt % or more of the insulation board.

[0006] In a first embodiment of the air conditioning duct, the joining means includes a rectangular tube-shaped nipple spanning the inner surfaces of the two adjacent duct members, caulking agent evenly distributed between the outer surface of the nipple and the inner surface of each duct member and between the opposing end faces of the two duct members, and aluminum adhesive tape wrapped around the circumferential direction of the air conditioning duct, spanning the outer surfaces of the two duct members. The caulking agent is preferably applied evenly over the entire surface to be coated. It is preferable that the amount of application at each location on the surface to be coated is approximately constant. The caulking agent may also be applied in a serpentine manner so as to spread over the entire surface to be coated.

[0007] In a second aspect of the air conditioning duct, the joining means includes a rectangular tube-shaped nipple that spans the inner surfaces of the two adjacent duct members, and an aluminum glass cloth adhesive tape that spans the outer surfaces of the two duct members and is wrapped around the circumferential direction of the air conditioning duct. In the second aspect, no caulking agent may be provided between the outer surface of the nipple and the inner surface of each duct member, and between the opposing end faces of the two duct members.

[0008] In a third aspect of the air conditioning duct, one of the two adjacent duct members has a convex end surface of a quadrangular pyramid that protrudes toward the other duct member, and the other duct member has a concave end surface of a quadrangular pyramid into which the convex end surface is fitted, The joining means includes a caulking agent applied between the opposing end faces and aluminum adhesive tape or aluminum glass cloth adhesive tape wrapped around the circumferential direction of the air conditioning duct, spanning the outer surfaces of the two duct components. In the third aspect, there may be no nipple that spans the inner surfaces of the two adjacent duct members. The caulking agent is preferably applied so as to be uniformly distributed between the opposing end faces.

[0009] Preferably, caulking is applied to the inner corners of each duct member defined by two orthogonal insulation boards. It is preferable that the side end faces of the two orthogonal insulating boards in the duct member are inclined at an angle of 45° to the main surface, and that the side end faces of the two insulating boards are butted against each other via a caulking agent. Either the caulking agent on the inner corner portions or the caulking agent between the side end faces forming the 45° inclined surfaces may be omitted. The caulking agent is preferably silicone-based, but is not limited to this and may be urethane-based. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide an air conditioning duct that can ensure load-bearing capacity at the joints between duct members. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a side view of an air conditioning duct according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a front cross-sectional view of the air conditioning duct taken along line II-II in FIG. [Figure 3] 3 is a front cross-sectional view of the air conditioning duct taken along line III-III in FIG. [Figure 4] FIG. 4 is an enlarged cross-sectional view of the circle IV in FIG. [Figure 5]5 is a side cross-sectional view of the air conditioning duct taken along line VV in FIG. [Figure 6] FIG. 6 is an enlarged cross-sectional view of the circled portion VI in FIG. [Figure 7] FIG. 7 is a perspective view showing how duct members of the air conditioning duct are connected to each other. [Figure 8] FIG. 8 is a side cross-sectional view of an air conditioning duct according to a second embodiment of the present invention. [Figure 9] FIG. 9 is a side cross-sectional view of an air conditioning duct according to a third embodiment of the present invention. [Figure 10] FIG. 10 is a graph showing the results of the example and the comparative example. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. <First embodiment (FIGS. 1 to 7)>

[0013] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in Fig. 1, an air conditioning system including an air conditioning duct 1 is installed in a building such as an office building or a house. The air conditioning duct 1 includes a plurality of duct members 11 and a connecting means 20. The duct members 11 are arranged in a line. Two adjacent duct members 11 are connected to each other via the connecting means 20.

[0014] As shown in Figures 2 and 3, each duct member 11 is formed in the shape of a rectangular tube with a square cross section. In Figures 2 and 3, the cross-sectional shape of the duct member 11 is a horizontally long rectangle, but is not limited to this and may be a square. Each of the four walls of the duct member 11 is formed by an insulating board 13. The insulating board 13 contains a rigid foamed resin as a main material.

[0015] The components of the rigid resin foam include polyisocyanurate, polyolefin, urethane, phenol, etc., and preferably polyisocyanurate. The rigid resin foam has at least self-supporting property and shape retention, and further has excellent heat insulating property and self-extinguishing property. The cell structure of the rigid resin foam is preferably closed cell. The water absorption of the rigid resin foam is preferably 2 g / 100 cm. 2 The moisture permeability coefficient of the rigid foam resin is preferably 2 ng / (m 2 The density of the rigid foam resin is preferably 20 kgf / m 3 ~50kgf / m 3 degree, preferably 34kgf / m 3 The thermal conductivity of the rigid foamed resin is preferably about 0.010 W / m·K to 0.030 W / m·K, and more preferably about 0.020 W / m·K.

[0016] The length of each duct member 11 (the dimension in the direction perpendicular to the paper surface of Figs. 2 and 3) is preferably about 100 mm to 3000 mm. The outer width of the duct member 11 is preferably about 200 mm to 1550 mm. The outer height of the duct member 11 is preferably about 200 mm to 1550 mm. The thickness of the heat insulating board 13 is preferably about 10 mm to 50 mm, and more preferably about 20 mm. The weight per unit area of ​​the heat insulating board 13 is preferably 0.5 kgf / m 2 ~1.5kgf / m 2 It is about 1.0 kgf / m 2 That's about it.

[0017] 2 and 3, the outer surface 13a and inner surface 13b (main surface) of each insulation board 13 are covered with a metal sheet 15 such as aluminum. The rigid foam resin is exposed on side end surfaces 13d on both sides in the width direction, which is perpendicular to the longitudinal direction of each insulation board 13. The side end surfaces 13d are inclined at an angle of 45° to the outer surface 13a and inner surface 13b.

[0018] As shown in Fig. 4, the opposing side end faces 13d of two orthogonal insulation boards 13 in the duct member 11 are butted against each other via a caulking agent 31. The caulking agent 31 is applied to the entire side end faces 13d over the entire length of the duct member 11. The two insulation boards 13 are joined together by the caulking agent 31.

[0019] As shown in Fig. 4, a caulking agent 32 is provided at the inner corner portion 14 defined by these two insulation boards 13. The caulking agent 32 spans the two insulation boards 13 to join these insulation boards 13 together, and extends over the entire length of the duct member 11 in the longitudinal direction (the direction perpendicular to the plane of the paper in Fig. 4).

[0020] The application of the caulking agents 31 and 32 and the assembly of the heat insulating board 13 are carried out at the manufacturing plant of the duct member 11 or at the construction site. As the caulking agents 31 and 32, a silicone-based caulking agent is preferably used. Either one of the caulking agents 31 and 32 may be omitted.

[0021] As shown in FIG. 1, a joint means 20 is provided at a joint 12 between two adjacent duct members 11. 5, the joining means 20 includes a nipple 21, an aluminum adhesive tape 22, and caulking agents 41, 42, and 43. The nipple 21 is formed in a rectangular tubular shape that matches the inner surface of the duct member 11. The nipple 21 spans the inner surfaces of two adjacent duct members 11.

[0022] The nipple 21 is made of a metal such as zinc, iron, or aluminum. Preferably, the nipple 21 is made of a zinc steel plate. The thickness of the nipple 21 is preferably about 1 mm or less, and more preferably 0.8 mm. The length L of the nipple 21 is 21 is preferably L 21 = 30 mm to 300 mm, and more preferably L 21 = about 60mm.

[0023] 5 and 6, of two adjacent duct members 11, a caulking agent 41 is evenly distributed and applied between the inner surface of one duct member 11A (the left side in FIG. 5) and the outer surface of the nipple 21. The duct member 11A and the nipple 21 are joined by the caulking agent 41. A silicone-based caulking agent is preferably used as the caulking agent 41. The application of the caulking agent 41 and the joining of the duct member 11A and the nipple 21 are carried out in a manufacturing factory of the duct member 11.

[0024] As shown in Figures 5 and 6, of two adjacent duct members 11, a caulking agent 42 is evenly distributed between the inner surface of the other duct member 11B (the one on the right in Figure 5) and the outer surface of the nipple 21. As shown by the crosshatched pattern in Figure 7, the caulking agent 42 is evenly applied, preferably over the entire outer surface of the nipple 21. The caulking agent 42 bonds the duct member 11B and the nipple 21. Consequently, the duct members 11A and 11B are bonded to each other via the nipple 21 and the caulking agents 41 and 42. A silicone-based caulking agent is preferably used as the caulking agent 42. The application of the caulking agent 42 and the joining of the duct member 11B and the nipple 21 are carried out when the air conditioning duct 1 is installed in the building.

[0025] As shown in Figures 5 and 6, a caulking agent 43 is evenly distributed between the opposing end faces 11e of two adjacent duct members 11A, 11B. As shown by the hatched pattern in Figure 7, the caulking agent 43 is evenly applied, preferably over the entire area of ​​the opposing end faces 11e. The duct members 11A, 11B are joined together by the caulking agent 43. A silicone-based caulking agent is preferably used as the caulking agent 43. The application of the caulking agent 43 and the joining of the duct members 11A, 11B to each other are carried out when the air conditioning duct 1 is installed in the building.

[0026] Furthermore, aluminum adhesive tape 22 is attached to joint 12 between duct members 11A and 11B of air conditioning duct 1. Aluminum adhesive tape 22 includes base tape 22a made of an outer aluminum foil sheet and an inner adhesive layer 22b. Aluminum adhesive tape 22 is wrapped around the outer periphery of air conditioning duct 1 so as to straddle the outer surfaces of the two duct members 11A and 11B. Duct members 11A and 11B are joined together by aluminum adhesive tape 22. The aluminum adhesive tape 22 is wound when the air conditioning duct 1 is installed in the building.

[0027] As shown in Figures 1 and 2, the air conditioning duct 1 is suspended by a plurality of suspension support means 50. The suspension support means 50 are arranged at intervals along the longitudinal direction of the air conditioning duct 1. Each suspension support means 50 includes a pair of suspension members 51 made of fully threaded bolts and a support beam 53. Each suspension member 51 hangs vertically from the ceiling member 2. The support beam 53 is horizontally suspended across the lower ends of the pair of suspension bolts 51. The air conditioning duct 1 rests on the support beam 53. Hereinafter, the support beam 53 will be referred to as the "fulcrum 53" as appropriate. The spacing between the suspension support means 50, i.e., the distance between the fulcrums, is, for example, approximately 1.5 m to 2 m, and preferably approximately 1820 mm.

[0028] The air conditioning duct 1 is manufactured and installed as follows. <Fabrication of duct member 11> Four insulation boards 13 are assembled into a square to create the duct member 11. Caulking agent 31 is applied to the entire area between the opposing 45° cut side end faces 13d of the orthogonal insulation boards 13. Caulking agent 32 is also applied to the inner corner portions 14, preferably along the entire length.

[0029] A caulking agent 41 is applied to the outer surface of one half of the longitudinal direction of the nipple 21, preferably over the entire area. One half of the nipple is inserted into one end of the duct member 11 in the longitudinal direction, and the other half of the nipple 21 protrudes from the duct member 11 (FIG. 7).

[0030] <Installation of air conditioning duct 1> The multiple duct members 11 fabricated in this manner are carried to the construction site of the building. Then, while each duct member 11 is suspended by the suspension support means 50, the nipple 21 protruding from one longitudinal end of one duct member 11A is inserted into the opposing end of the adjacent duct member 11B. As shown in the crosshatched pattern in FIG. 7, a caulking agent 42 is applied to preferably the entire outer surface of the protruding half of the nipple 21. Furthermore, a caulking agent 43 is applied to preferably the entire opposing end surface 11e of either duct member 11A or 11B. The caulking agents 42 and 43 may be applied in a serpentine pattern. Furthermore, an aluminum adhesive tape 22 is wrapped around the outer surfaces of the two duct members 11A and 11B so as to straddle them. This joins the adjacent duct members 11A and 11B via the joining means 20, which consists of the nipple 21, the aluminum adhesive tape 22, and the caulking agents 41-43. In this way, the air conditioning duct 1 is produced by connecting a plurality of duct members 11 in a row.

[0031] In the air conditioning duct 1, by providing a joining means 20 at the joint 12 between two adjacent duct members 11, it is possible to ensure the load-bearing capacity of the joint 12. That is, when the air conditioning duct 1 is supported by a pair of supports 53 separated by the support distance (1820 mm) of, for example, 1820 mm across the joint 12, and a vertical load is applied to the joint 12, the two duct members 11 are joined together by the joining means 20 so that the load-bearing capacity of the air conditioning duct 1 at the joint 12 is 1000 N or more. Preferably, the load-bearing capacity at the joint 12 can be made greater than the load-bearing capacity at the longitudinal middle of each duct member 11 of the air conditioning duct 1.

[0032] Next, another embodiment of the present invention will be described. In the following embodiments, the same components as those already described will be denoted by the same reference numerals in the drawings and the description thereof will be omitted. <Second embodiment (FIG. 8)> 8, in an air conditioning duct 1B according to a second embodiment of the present invention, an aluminum glass cloth adhesive tape 24 is used as one of the joining means 20, instead of the aluminum adhesive tape 22 of the first embodiment. The aluminum glass cloth adhesive tape 24 has a glass cloth 24b sandwiched between an outer base tape 24a made of an aluminum foil sheet and an inner adhesive layer 24c. The aluminum glass cloth adhesive tape 24 is wrapped around the outer surfaces of two adjacent duct members 11A, 11B in the circumferential direction of the air conditioning duct 1B. In the second embodiment, the caulking agents 42 and 43 may be omitted.

[0033] <Third embodiment (FIG. 9)> 9, in an air conditioning duct 1C according to a third embodiment of the present invention, the end face 13f of each heat insulating board 13 of a duct member 11A facing the duct member 11B is inclined at an internal angle of 45° with respect to the inner face 13b. As a result, the opposing end face 11f of the duct member 11A forms a convex quadrangular pyramid that protrudes toward the other duct member 11B. The end face 13g of each heat insulating board 13 of the duct member 11B facing the duct member 11A is inclined at an internal angle of 45° with respect to the outer surface 13a. This makes the opposing end face 11g of the duct member 11B a concave surface of a quadrangular pyramid. The opposing end face 11g forming the concave surface of the quadrangular pyramid is fitted with the opposing end face 11f forming the convex surface of the quadrangular pyramid.

[0034] A caulking agent 45 is preferably applied over the entire area between these opposing end faces 11f, 11g. The two duct members 11A, 11B are joined together via the caulking agent 45. Furthermore, an aluminum adhesive tape 22 is wrapped around the outer surfaces of the two duct members 11A and 11B in the circumferential direction of the air conditioning duct 1C. In the third embodiment, the nipple 21 and the caulking agents 41 and 42 of the first embodiment (FIG. 5) may be omitted. The aluminum adhesive tape 22 may be replaced with an aluminum glass cloth adhesive tape 24 (FIG. 8).

[0035] The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention. For example, either one of the caulking agents 31 and 32 of the duct member 11 may be omitted. [Example]

[0036] Examples will be described below, but the present invention is not limited to the following examples. In Example 1, a static load-bearing test was carried out on a sample of an air-conditioning duct 1 made of a duct member 11 substantially equivalent to that of the first embodiment (FIGS. 4 to 7). The outer dimensions of each duct member 11 were 300 mm in width, 300 mm in height, and 910 mm and 405 mm in length. The thickness of the heat insulating board 13 is t 13 =20mm. The hard foam resin component of the heat insulating board 13 was polyisocyanurate. The two duct members 11 were joined via joining means 20. The joining means 20 used were a nipple 21, caulking agents 41, 42, and 43, and aluminum adhesive tape 22. The caulking agents 41, 42, and 43 were evenly applied to the entire outer surface of the nipple 21 and the entire area between the opposing end faces 11e. The length of the nipple 21 along the duct axis is L 21 =60mm. As the caulking agents 41 to 43, silicone-based caulking agents were used. The width of the aluminum adhesive tape 22 was 75 mm.

[0037] The air conditioning duct sample formed by joining the two duct members 11 was supported by a pair of supports 53 separated by a distance of 1820 mm across the joint 12. A cylindrical roller with its axis oriented horizontally and perpendicular to the duct axis was used as the support 53. The corresponding duct member 11 was placed on the cylindrical roller. A vertical load was applied (loaded) by attaching a weight to the joint 12 located exactly midway between the pair of supports 53. The load was increased stepwise, and the load at which the air conditioning duct ruptured was measured. As a result, the load at rupture was 1206N. Furthermore, when a weight was attached to the middle portion of one of the duct members 11A and a load was applied (loaded), the load at rupture was 1114N. The load resistance when the joint 12 is loaded was higher than the load resistance when the duct member 11 is loaded at the middle portion.

[0038] [Comparative Example 1] As a comparative example, an air conditioning duct sample similar to that of Example 1 was prepared, except that the caulking agent 42 was applied only to the edge of the nipple 21 and the caulking agent 43 was omitted. The air conditioning duct sample was subjected to a load resistance test similar to that of Example 1, and the load at rupture when a load was applied to the joint was 428N. Furthermore, the load at rupture when a load was applied to the middle portion of one of the duct members 11A was 1105N. [Example]

[0039] In Example 2, an aluminum glass cloth adhesive tape 24 was used instead of the aluminum adhesive tape 22 of Example 1, and a sample of an air conditioning duct 1B consisting of a duct member 11 substantially equivalent to that of the second embodiment (Figure 8) was produced and a static load-bearing test was conducted. The width of the aluminum glass cloth adhesive tape was 75 mm. Additionally, the caulking agent 42 was omitted. Other than that, the configuration of the air conditioning duct sample was the same as in Example 1. The air conditioning duct sample was subjected to a load resistance test similar to that of Example 1, and the load at rupture when a load was applied to the joint was 1033N. Furthermore, the load at rupture when a load was applied to the middle portion of one of the duct members 11A was 1069N. [Example]

[0040] In Example 3, the caulking agent 31 (Figure 4) between the side end faces 13d of each duct member 11 was omitted, and two air conditioning duct samples were otherwise similar to Example 1, and each was subjected to a load-bearing test similar to Example 1. The fracture load applied to the joint was 1369 N for one sample (n=1) and 1423 N for the other sample (n=2). [Example]

[0041] In Example 4, two air conditioning duct samples were produced in the same manner as in Example 1, except that the caulking agent 32 (Figure 4) on the inner corner portions 14 of each duct member 11 was omitted, and load-bearing tests similar to those in Example 1 were carried out on each. The fracture load applied to the joint was 1320N for one sample (n=1) and 1372N for the other sample (n=2). [Example]

[0042] In Example 5, a sample of an air conditioning duct 1C was produced, which was made of a duct member 11 substantially equivalent to that of the third embodiment (FIG. 9). The nipple 21 and the caulking agents 41 and 42 are omitted. Other than that, the configuration of the air conditioning duct sample was the same as in Example 1. When the air conditioning duct sample was subjected to a load resistance test similar to that of Example 1, the load at rupture when a load was applied to the joint was 1016 N. In addition, the load at rupture when a load was applied to the middle portion of one of the duct members 11A was 1020N. The results of Examples 1 to 5 and Comparative Example 1 are shown in FIG. [Industrial Applicability]

[0043] The present invention is applicable to, for example, air conditioning equipment for buildings. [Explanation of symbols]

[0044] 1. Air conditioning duct 1B, 1C air conditioning duct 11 Duct components 11A One duct member 11B Other duct member 11e Opposite end face 11f, 11g Opposite end faces of square pyramid 12 Joint 13 Insulation board 13a External surface (principal surface) 13b Inner surface (main surface) 13d side end face 13f, 13g Angled end face 14 Inner corner 15 Metal Sheet 20 Joining means 21 nipple 22 Aluminum adhesive tape 24 Aluminum Glass Cloth Adhesive Tape 31 Caulking agent between side end faces 32 Caulking agent for inner corners 41 Caulking agent between one duct member and nipple 42 Caulking agent between the other duct member and the nipple 43 Caulking agent between opposing end faces 45 Caulking agent between opposing ends of a square pyramid 50 Hanging support means 51 Hanging material 53 Support beam (fulcrum)

Claims

1. An air conditioning duct installed in a building, a plurality of duct members each having a rectangular cross section formed from an insulating board containing a hard foam resin as a main material and joined together in a row; a joining means provided at a joining portion between two adjacent duct members among the plurality of duct members; the joining means includes a square tube-shaped nipple that straddles the inner surfaces of the two duct members, a caulking agent that is applied so as to be uniformly distributed over the entire area between the outer surface of the nipple and the inner surface of each duct member and over the entire area between the opposing end faces of the two duct members, and an aluminum adhesive tape or an aluminum glass cloth adhesive tape that is wrapped around the circumferential direction of the air conditioning duct and straddles the outer surfaces of the two duct members, the two duct members are joined by the joining means so that when a vertical load is applied to the joint located exactly midway between the pair of supports with a support distance of 1820 mm between them and sandwiching the joint, the load-bearing capacity of the joint is 1000 N or more, and the load-bearing capacity of the joint is higher than that of the longitudinal midpoint of each duct member.

2. 2. The air conditioning duct according to claim 1, wherein one of the opposing end faces of the two adjacent duct members is a convex pyramid surface that protrudes toward the other duct member, and the opposing end face of the other duct member is a concave pyramid surface into which the convex surface is fitted.

3. 3. The air conditioning duct according to claim 1, wherein a caulking agent is applied to inner corner portions of each duct member defined by two orthogonal insulating boards.

4. An air conditioning duct as described in any one of claims 1 to 3, characterized in that the side end faces of two perpendicular insulation boards in the duct member are inclined at an angle of 45° to the main surface, and the side end faces of these two insulation boards are butted against each other via a caulking agent.

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