Ventilation pipe structure

Abstract

To facilitate installation of a sloped ventilation pipe on a wall and reduce thermal insulation loss between the sloped ventilation pipe and the wall at an opening on a building wall.SOLUTION: A ventilation pipe structure (10) is inserted into an opening (23) in a wall (20) and comprises an insulation material (2) covering an outer surface (1a) of a sloped ventilation pipe (1). In a thickness direction of the wall (20), an inner diameter (D2) of the insulation material (2) is set in accordance with an inclination of the outer surface (1a) of the ventilation pipe (1), and an outer diameter (D3) of the insulation material (2) is set so that an outer surface (2b) of the insulation material (2) matches an inner surface (23a) of the opening (23).SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a ventilation pipe structure. [Background technology]

[0002] In a building, when a wall is constructed, a vent pipe used for ventilation and exhaust is passed through the wall and fixed. Among vent pipes, there is an inclined vent pipe in which the axis of the cylindrical part is inclined with respect to the wall surface. For example, Patent Document 1 discloses a vent pipe device equipped with an inclined vent pipe with a flange on the outer periphery. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2005-61080 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the ventilation pipe device of Patent Document 1, a flange is provided on the ventilation pipe, which is fixed to the wall of the building, and the inclined posture of the ventilation pipe is fixed. In the ventilation pipe device of Patent Document 1, when installing the ventilation pipe, it is not necessary to provide an opening formed of a base material arranged in a cross pattern in the wall of the building. Therefore, the technology of Patent Document 1 does not support the case where an inclined ventilation pipe is inserted into an opening formed of a base material arranged in a cross pattern.

[0005] When inserting an inclined ventilation pipe into an opening formed in the wall of a building, there is room for improvement in that (1) it is not easy to attach the ventilation pipe to the wall surface, and (2) there is a lack of insulation between the inclined ventilation pipe and the wall at the opening.

[0006] One aspect of the present invention aims to provide a ventilation pipe structure that allows easy installation of an inclined ventilation pipe on a wall and reduces insulation loss between the inclined ventilation pipe and the wall at an opening in the wall of a building. [Means for solving the problem]

[0007] In order to solve the above problems, one aspect of the present invention is as follows.

[0008] [1] A ventilation pipe structure inserted into an opening in a wall having an exterior wall material and an interior wall material, comprising an inclined ventilation pipe installed at an angle to the wall surface, and a thermal insulation material covering the outer surface of the ventilation pipe, wherein in the thickness direction of the wall, the inner diameter of the thermal insulation material is set to match the inclination of the outer surface of the ventilation pipe, and the outer diameter of the thermal insulation material is set so that the outer surface of the thermal insulation material fits the inner surface of the opening.

[0009] [2] The ventilation pipe structure of [1], wherein the insulation material is composed of multiple divided insulation materials divided in the circumferential direction.

[0010] [3] A ventilation pipe structure of [1] or [2], wherein the opening has a rectangular fixed frame arranged along the opening, and the outer peripheral dimensions of the insulation material are adapted to the inner peripheral dimensions of the fixed frame.

[0011] [4] The ventilation pipe structure according to any one of [1] to [3], wherein the insulating material is a resin foam molded body having a base resin selected from the group consisting of polystyrene-based resins, polyolefin-based resins, and polyvinyl chloride-based resins.

[0012] [5] The ventilation pipe structure according to any one of [1] to [4], wherein the heat insulating material is a resin foam molded product having a thermal conductivity of 0.042 W / m·K or less.

[0013] [6] Any of the ventilation pipe structures of [1] to [5], wherein the insulation material is a cylindrical resin foam molded body, the inner surface of the insulation material is a surface that follows the outer surface of the ventilation pipe, and the outer surface of the insulation material is a surface that follows the inner surface of the opening. Effect of the Invention

[0014] According to one aspect of the present invention, the inclined ventilation pipe can be easily attached to a wall, and the insulation loss between the inclined ventilation pipe and the wall at the opening in the wall of a building can be reduced. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is a cross-sectional view showing a schematic configuration of a ventilation pipe structure 10 according to a first embodiment of the present invention. [Diagram 2] 2A to 2C are a cross-sectional view, a top view, a front view, and a rear view showing a schematic configuration of a heat insulating material provided in the ventilation pipe structure 10 shown in FIG. [Diagram 3] 2 is a cross-sectional view showing a schematic example of a method for attaching the ventilation pipe structure 10 shown in FIG. 1 to a wall 20. FIG. [Figure 4] 401 is a front view showing a schematic configuration of an example of an opening in a wall into which a ventilation pipe structure 10 according to embodiment 1 of the present invention is inserted, and 402 is a front view showing a schematic state in which the ventilation pipe structure is inserted into the opening 23 shown in 401. [Diagram 5] FIG. 2 is a cross-sectional view showing a schematic configuration of a modified example of the ventilation pipe structure 10A according to the first embodiment of the present invention. [Figure 6] 10A and 10B are front views showing a schematic configuration of a ventilation pipe structure 10C according to a second embodiment of the present invention, showing a state after it has been inserted into an opening and a state before it has been inserted into the opening. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] The following is a detailed description of the embodiments of the present invention. However, the present invention is not limited to these, and various modifications are possible within the scope of the description. The technical scope of the present invention also includes embodiments obtained by appropriately combining the technical means disclosed in the different embodiments and examples. In this specification, unless otherwise specified, "A to B" indicating a numerical range means "A or more (including A and larger than A) and B or less (including B and smaller than B)."

[0017] In the drawings of the present application, "LD" refers to the length direction, "LDa" refers to one side in the length direction (front side, front side), "LDb" refers to the other side in the length direction (rear side, back side), "WD" refers to the width direction, "HD" refers to the height direction, "HDa" refers to the lower side which is one side in the height direction, and "HDb" refers to the upper side which is the other side in the height direction. The "length direction" here is one of the horizontal directions, and refers to the thickness direction of the wall on which the ventilation pipe structure is installed, and the "width direction" refers to the horizontal direction perpendicular to the length direction, and refers to the width direction of the wall. The "height direction" refers to the direction perpendicular to both the "length direction" and the "width direction", and corresponds to the height direction of the wall. The LDa side corresponds to the outside of the room, and the LDb side corresponds to the inside of the room, across the wall.

[0018] [Embodiment 1] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will now be described in detail. Fig. 1 is a cross-sectional view showing a schematic configuration of a ventilation pipe structure 10 according to this embodiment.

[0019] As shown in FIG. 1, the ventilation pipe structure 10 according to the present embodiment is inserted into the opening 23 of the wall 20. The wall 20 has an exterior wall material 21 and an interior wall material 22. The exterior wall material 21 is a member constituting the wall surface on the LDa side of the wall 20, and the interior wall material 22 is a member constituting the wall surface on the LDb side of the wall 20. The opening 23 communicates with the LDa side and the LDb side of the wall 20 and extends in the LD direction. Therefore, the axis of the opening 23 extends in the horizontal direction. Although not shown in FIG. 1, the opening 23 is rectangular. Note that the wall 20 is not particularly limited as long as it has the opening 23 and includes the exterior wall material 21 and the interior wall material 22, and a wall used in a conventionally known building can be applied. For example, a heat insulating material may be interposed between the exterior wall material 21 and the interior wall material 22 in the wall 20.

[0020] The ventilation pipe structure 10 includes an inclined ventilation pipe 1 and a heat insulating material 2. The ventilation pipe 1 has a cylindrical shape. The heat insulating material 2 is a member that covers the outer surface of the ventilation pipe 1.

[0021] In the ventilation pipe structure 10, the ventilation pipe 1 is installed at an incline with respect to the wall surface of the wall 20. The axis X1 of the ventilation pipe 1 is inclined in the LD direction with respect to a horizontal plane S perpendicular to the wall surface of the wall 20. The ventilation pipe 1 is inclined in the HD direction so that the end on the LDa side is located on the HDa side with respect to the end on the LDb side. By making the ventilation pipe 1 in such an inclined position, it is possible to prevent rainwater blown in from outside and condensation water inside the ventilation pipe 1 from entering the LDb side (inside the room).

[0022] In the conventional technology, when the ventilation pipe 1 is attached to the surface of the wall 20 in the above-mentioned inclined position with respect to the opening 23 of the wall 20, in order to reduce the insulation loss between the ventilation pipe 1 and the wall 20 at the opening 23, it is necessary to fill the gap between the inner surface of the opening 23 and the outer surface of the ventilation pipe 1 with a heat insulating material such as glass wool. Therefore, in the conventional technology, such a filling work of the heat insulating material is required, and it is not easy to attach the inclined type ventilation pipe 1 to the surface of the wall 20. Furthermore, when viewed from the LDa side, the heat insulating material such as glass wool is exposed, and the aesthetic appearance of the ventilation pipe structure is not good.

[0023] Therefore, the ventilation pipe structure 10 according to this embodiment is characterized by the insulating material 2 covering the ventilation pipe 1. Fig. 2 shows a cross-sectional view, a top view, a front view, and a back view showing a schematic configuration of the insulating material 2 provided in the ventilation pipe structure 10.

[0024] 1 and 2, in the thickness direction of the wall 20, i.e., in the LD direction, the inner diameter D2 of the heat insulating material 2 is set to match the inclination of the outer surface 1a of the ventilation pipe 1. In addition, the outer diameter D3 of the heat insulating material 2 is set so that the outer surface 2b of the heat insulating material 2 matches the inner surface 23a of the opening 23.

[0025] The heat insulating material 2 is a cylindrical resin foam molded body. The size of the inner diameter D2 of the heat insulating material 2 is the same as the size of the outer diameter D1 of the ventilation pipe 1 in the LD direction. On the other hand, the center position of the inner diameter D2 of the heat insulating material 2 is not a fixed position in the LD direction, but is along the inclination of the axis X1 of the ventilation pipe 1. That is, in the ventilation pipe structure 10, the center of the inner diameter D2 of the heat insulating material 2 is on the axis X1 of the ventilation pipe 1. When the inner diameter D2 is set in this way, the inner surface 2a of the heat insulating material 2 is a surface along the outer surface 1a of the ventilation pipe 1. Moreover, as a result of the outer diameter D3 of the heat insulating material 2 being set as described above, the outer surface 2b of the heat insulating material 2 is a surface along the inner surface 23a of the opening 23.

[0026] Thus, according to the ventilation pipe structure 10, the insulating material 2 is a cylindrical resin molded body having (1) an inner surface 2a along the outer surface 1a of the ventilation pipe 1, and (2) an outer surface 2b along the inner surface 23a of the opening 23. Therefore, according to the ventilation pipe structure 10, the inclined ventilation pipe 1 can be easily attached to the wall surface of the wall 20, and the insulation defect between the ventilation pipe 1 and the wall 20 at the opening 23 of the wall 20 of the building can be reduced.

[0027] FIG. 3 is a cross-sectional view showing a typical example of a method for attaching the ventilation pipe structure 10 to the wall 20. In the method shown in FIG. 3, first, the cylindrical insulation material 2 is inserted into the opening 23 of the wall 20. Then, the ventilation pipe 1 is inserted into the cylindrical insulation material 2 inserted into the opening 23. In this manner, in the ventilation pipe structure 10, the ventilation pipe 1 can be attached to the wall surface of the wall 20 by the simple process of inserting the insulation material 2 into the opening 23 and inserting the ventilation pipe 1 into the insulation material 2. In addition, with the ventilation pipe 1 attached to the wall 20, the inner surface 2a of the insulation material 2 is in close contact with the outer surface 1a of the ventilation pipe 1, and the outer surface 2b of the insulation material 2 is in close contact with the inner surface 23a of the opening 23. Therefore, the insulation material 2 can reduce the insulation loss between the ventilation pipe 1 and the wall 20 at the opening 23. Therefore, according to the ventilation pipe structure 10, the inclined ventilation pipe 1 can be easily attached to the wall surface of the wall 20, and the insulation loss between the ventilation pipe 1 and the wall 20 at the opening 23 of the wall 20 of the building can be reduced. Furthermore, when the ventilation pipe structure 10 is viewed from the LDa side, the insulation material 2 which is a resin foam molded body is exposed, so that the aesthetic appearance of the ventilation pipe structure 10 is improved compared to when an insulation material made of glass wool or the like is used.

[0028] Furthermore, according to the ventilation pipe structure 10, the inclined posture of the ventilation pipe 1 is fixed simply by attaching the ventilation pipe structure 10 to the wall 20 by, for example, the method shown in Fig. 3. Therefore, it can be said that the insulating material 2 has a role of determining the inclined posture of the ventilation pipe 1 in addition to the role of reducing the above-mentioned insulation loss. Therefore, according to the ventilation pipe structure 10, the inclined posture of the ventilation pipe 1 can be determined without providing a separate positioning structure such as a flange for the ventilation pipe 1. This increases the versatility of the ventilation pipe 1.

[0029] In the method shown in Fig. 3, the insulation material 2 is inserted into the opening 23, and then the ventilation pipe 1 is inserted into the insulation material 2. However, the method of attaching the ventilation pipe structure 10 to the wall 20 is not limited to the method shown in Fig. 3, and the order of inserting the insulation material 2 into the opening 23 and inserting the ventilation pipe 1 into the insulation material 2 does not matter. The ventilation pipe structure 10 may be inserted into the opening 23 of the wall 20 with the ventilation pipe 1 inserted into the insulation material 2.

[0030] The method of attaching the ventilation pipe structure 10 to the wall 20 can be restated as a method of installing the ventilation pipe 1 on the wall 20 or a method of manufacturing the ventilation pipe structure 10.

[0031] The opening 23 in the wall 20 is not particularly limited as long as the ventilation pipe structure 10 can be inserted therein, and any opening used in a conventionally known building can be applied. 401 in Fig. 4 is a front view showing a schematic configuration of an example of the opening 23 in the wall into which the ventilation pipe structure 10 is inserted, and 402 in Fig. 4 is a front view showing a schematic state in which the ventilation pipe structure 10 is inserted into the opening 23 shown in 401 in Fig. 4.

[0032] As shown in 401 of Fig. 4, the opening 23 has a rectangular fixing frame arranged along the opening. The fixing frame has four receiving members 23b to 23e. These receiving members 23b to 23e function as base members of the opening 23. In the opening 23, the four receiving members 23b to 23e are assembled in a grid pattern to form a rectangular fixing frame.

[0033] 4, when the ventilation pipe structure 10 is inserted into the opening 23, the outer circumferential dimension of the heat insulating material 2 matches the inner circumferential dimension of the fixing frame. Therefore, the heat insulating material 2 is shaped to fit into the fixing frame assembled by the receiving members 23b to 23e.

[0034] (Modification) In the configuration of the ventilation pipe structure 10 according to this embodiment, a modified example of the configuration shown in Fig. 1 will be described. Fig. 5 is a cross-sectional view showing a schematic configuration of a modified example of the ventilation pipe structure 10 according to this embodiment.

[0035] As shown in Fig. 5, a ventilation pipe structure 10A as a modified example differs from the ventilation pipe structure 10 shown in Fig. 1 in that a flange 1B is provided on the ventilation pipe 1. The flange 1B is provided on the LDa side of the ventilation pipe 1. The flange 1B extends in the HD direction from the outer surface of the ventilation pipe 1 so as to cover the end face of the thermal insulation material 2 on the LDa side.

[0036] The flange 1B extends at an angle to the axis of the ventilation pipe 1, and is attached to the exterior wall material 21 so as to be parallel to the wall surface of the wall 20. By fixing the flange 1B to the exterior wall material 21, the inclined posture of the ventilation pipe 1 is determined.

[0037] (Insulation 2) The heat insulating material 2 may be made of any conventionally known material, so long as it is made of a material that can reduce the insulation loss between the ventilation pipe 1 and the wall 20 at the opening 23. Preferably, the heat insulating material 2 is a resin foam molded body using a resin selected from the group consisting of polystyrene resins, polyolefin resins, and polyvinyl chloride resins as a base resin.

[0038] The polystyrene resin is not particularly limited, and includes resins containing a resin having a structural unit derived from a styrene monomer. Suitable examples of the styrene monomer include styrene, methylstyrene, ethylstyrene, isopropylstyrene, dimethylstyrene, bromostyrene, chlorostyrene, vinyltoluene, and vinylxylene. Suitable examples of the resin having a structural unit derived from a styrene monomer include (a) a homopolymer of a styrene monomer obtained by polymerizing one type of styrene monomer, or (b) a copolymer of a styrene monomer obtained by polymerizing two or more types of styrene monomer. A homopolymer of a styrene monomer and a copolymer of a styrene monomer, that is, a polystyrene resin, which is a resin having only a structural unit derived from a styrene monomer, can be preferably used.

[0039] The polyolefin resin is not particularly limited, and examples thereof include polypropylene resin, polyethylene resin, etc. Specific examples of monomers of polyolefin resins (hereinafter, sometimes referred to as olefin monomers) include α-olefins having 2 to 12 carbon atoms, such as ethylene, propylene, butene-1, isobutene, pentene-1, 3-methyl-butene-1, hexene-1, 4-methyl-pentene-1, 3,4-dimethyl-butene-1, heptene-1, 3-methyl-hexene-1, octene-1, and decene-1. These may be used alone or in combination of two or more.

[0040] Examples of other monomers copolymerizable with the olefin monomer include cyclic olefins such as cyclopentene, norbornene, and 1,4,5,8-dimethano-1,2,3,4,4a,8,8a,6-octahydronaphthalene, and dienes such as 5-methylene-2-norbornene, 5-ethylidene-2-norbornene, 1,4-hexadiene, methyl-1,4-hexadiene, and 7-methyl-1,6-octadiene. These may be used alone or in combination of two or more.

[0041] Specific examples of polyolefin resins include polyethylene resins mainly composed of ethylene, such as high-density polyethylene, medium-density polyethylene, low-density polyethylene, and linear low-density polyethylene, and polypropylene resins mainly composed of propylene. These polyolefin resins may be used alone or in combination of two or more.

[0042] Among these polyolefin-based resins, polyethylene-based resins containing ethylene as a main component are effective in the manufacturing method of foamed molded articles according to the present embodiment described below. In particular, polypropylene-based resins containing ethylene as a copolymerization monomer component, in which the α-olefin is ethylene, are easily available and have excellent processability.

[0043] The polypropylene-based resin is not particularly limited as long as it contains propylene as the main monomer component, and examples thereof include propylene homopolymer, α-olefin-propylene random copolymer, α-olefin-propylene block copolymer, etc. These may be used alone or in combination of two or more kinds.

[0044] The polyvinyl chloride resin is not particularly limited, but examples thereof include homopolymers of vinyl chloride, copolymers in which vinyl chloride is copolymerized with a polymerizable monomer other than vinyl chloride, graft copolymers in which vinyl chloride is grafted onto a polymer other than vinyl chloride, chlorinated vinyl chloride resins obtained by post-chlorinating these by a conventionally known method, and mixtures of these.

[0045] The degree of polymerization of the vinyl chloride resin is not particularly limited, but is preferably 300 to 1,400, and more preferably 700 to 1,300, in consideration of the processability of the heat insulating material.

[0046] The polymerizable monomer other than vinyl chloride is not particularly limited as long as it has a reactive double bond, and examples thereof include α-olefins such as ethylene, propylene, butylene, etc.; vinyl esters such as vinyl acetate, vinyl propionate, etc.; vinyl ethers such as butyl vinyl ether, cetyl vinyl ether, etc.; acrylic acid esters such as methyl acrylate, ethyl acrylate, etc.; methacrylic acid esters such as methyl methacrylate, ethyl methacrylate, phenyl methacrylate, etc.; aromatic vinyls such as styrene, α-methylstyrene, vinyl toluene, etc.; vinyl halides such as vinylidene chloride, vinyl fluoride, etc.; and N-substituted maleimides such as N-phenylmaleimide, N-cyclohexylmaleimide, etc., and one or more of these may be used.

[0047] As the blowing agent, volatile hydrocarbon blowing agents such as propane, isobutane, butane, pentane, hexane, etc., inorganic gases such as air, nitrogen, carbon dioxide, etc., and water can be used. When an inorganic gas is used, carbon dioxide is preferred because it is easy to obtain expanded particles with a relatively high expansion ratio. These blowing agents may be used alone or in combination of two or more kinds.

[0048] Furthermore, the heat insulating material 2 is preferably a resin foam molded product having a thermal conductivity of 0.042 W / m·K or less. When the thermal conductivity is within the above range, the effect of exhibiting high heat insulating performance is achieved. The thermal conductivity of the heat insulating material 2 is more preferably 0.038 W / m·K or less, and particularly preferably 0.036 W / m·K or less. Furthermore, there is no particular lower limit for the thermal conductivity of the heat insulating material 2.

[0049] [Embodiment 2] Other embodiments of the present invention will be described below. For ease of explanation, the same reference numerals are given to members having the same functions as those described in the above embodiment, and the description thereof will not be repeated.

[0050] 6 is a front view showing a schematic configuration of a ventilation pipe structure 10C according to this embodiment, showing a state after loading into an opening and a state before loading into an opening. The ventilation pipe structure 10C according to this embodiment differs from the first embodiment in the configuration of the heat insulating material 2C.

[0051] As shown in Fig. 6, the thermal insulation material 2C is composed of multiple divided thermal insulation materials 21C and 22C divided in the circumferential direction. The circumferential direction here means a direction perpendicular to a line connecting an arbitrary point on the outer surface 2b of the thermal insulation material 2C and the center (axis) of the thermal insulation material 2C when the thermal insulation material 2C is viewed from the LD direction. The circumferential direction also includes the HD direction and the WD direction.

[0052] 6, a thermal insulation material 2C is composed of divided thermal insulation materials 21C and 22C that are divided in two in the HD direction. The joint surface between the divided thermal insulation materials 21C and 22C extends in the LD direction.

[0053] In this way, according to the ventilation pipe structure 10C, the heat insulating material 2C is composed of a plurality of divided heat insulating materials 21C and 22C divided in the circumferential direction, so the heat insulating material 2C is easier to mold than when the heat insulating material 2C is molded as a single unit. As a result, the heat insulating material 2C is easier to manufacture.

[0054] As long as the insulation material 2C is divided in the circumferential direction, the number and configuration of the divided insulation materials are not particularly limited and can be set appropriately depending on the difficulty of molding the insulation material 2C. Preferably, the insulation material 2C is composed of two divided insulation materials that divide the inner surface of the insulation material 2C into two. Particularly preferably, as shown in Fig. 6, the insulation material 2C is composed of divided insulation materials 21C and 22C that are divided into two in the HD direction.

[0055] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. [Industrial Applicability]

[0056] The invention can be used in the construction technology of building walls. [Explanation of symbols]

[0057] 1 Ventilation pipe 1a External surface 2. 2C Insulation material 21C, 22C split insulation 2a Inside surface 2b External surface 10, 10A, 10C Ventilation pipe structure 21 Exterior wall materials 22 Interior wall materials 23 Opening 23a Inside 23b, 23c, 23d, 23e receiving material D1 Outside diameter of ventilation pipe D2 Insulation inner diameter D3 Outside diameter of insulation

Claims

1. A ventilation pipe structure inserted into an opening in a wall having an exterior wall material and an interior wall material, An inclined ventilation pipe that is installed at an angle to the wall surface; A heat insulating material covering the outer surface of the ventilation pipe, In the thickness direction of the wall, The inner diameter of the heat insulating material is set according to the inclination of the outer surface of the ventilation pipe, A ventilation pipe structure, wherein the outer diameter of the insulation material is set so that the outer surface of the insulation material matches the inner surface of the opening.

2. The ventilation pipe structure according to claim 1 , wherein the insulating material is composed of a plurality of divided insulating materials divided in a circumferential direction.

3. The opening includes a rectangular fixing frame disposed along the opening, The ventilation pipe structure according to claim 1 or 2, wherein the outer peripheral dimension of the insulating material is adapted to the inner peripheral dimension of the fixing frame.

4. 3. The ventilation pipe structure according to claim 1, wherein the insulating material is a resin foam molded body having a base resin selected from the group consisting of polystyrene-based resins, polyolefin-based resins, and polyvinyl chloride-based resins.

5. 3. The ventilation pipe structure according to claim 1, wherein the heat insulating material is a resin foam molded product having a thermal conductivity of 0.042 W / m·K or less.

6. The heat insulating material is a cylindrical resin foam molded body, The inner surface of the heat insulating material is a surface along the outer surface of the ventilation pipe, The ventilation pipe structure according to claim 1 or 2, wherein the outer surface of the insulation material is a surface that follows the inner surface of the opening.

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