JP6736237B2 - Dew condensation prevention square duct - Google Patents

Description

The present invention relates to a rectangular duct having a substantially square cross section, and more particularly to a dew condensation preventing rectangular duct capable of preventing dew condensation.

In an air conditioning duct or the like, the duct may be subjected to heat insulation at the installation site in order to prevent dew condensation (see, for example, Patent Document 1). That is, after the duct is attached to a predetermined installation place such as the ceiling, a sheet-shaped (strip-shaped) heat insulating material made of glass wool is wound around the duct. Such heat insulation treatment is usually carried out by an operator different from the operator who installs the duct, carrying in the heat insulating material to the site separately from the duct and arranging it.

JP, 2008-089288, A

However, since such a heat treatment is performed in a state where the duct is arranged in the ceiling, etc., the construction is difficult, and not only a great amount of labor and time is required for the construction, but also the waste material of the heat insulating material is generated at the installation site. It will occur and will require disposal. Particularly in recent years, construction/construction schedules and construction/construction costs including waste treatment costs have been severely limited and managed at construction sites, etc., and promptly perform heat insulation treatment of ducts as well as waste materials at the installation site. There is an urgent need to prevent it from occurring.

Moreover, conventionally, the contractor who installs the duct and the contractor who performs the heat insulation process are different, which makes it difficult and complicated to adjust the construction schedule, and it is necessary to secure a storage place for the heat insulating material separately from the duct. It was necessary to carry in and adjust the storage. Furthermore, not only the number of personnel is increased, the cost is increased, but also the safety may be impaired.

Therefore, an object of the present invention is to provide a dew condensation preventing square duct capable of preventing dew condensation without winding a heat insulating material.

In order to achieve the above-mentioned object, the invention according to claim 1 has an outer corner duct in which four plate-shaped outer wall portions are arranged in a substantially square tubular shape, and four plate-shaped inner wall portions are substantially square. The inner corner duct disposed in the outer corner duct in a tubular shape and the air layer between the outer corner duct and the inner corner duct have a predetermined thickness, and the inner corner duct is set to the outer corner duct. A thickness holding portion for holding the inside of the duct; and an outer joint portion that extends substantially perpendicularly to the plate surface of the outer wall portion is provided at an end portion of each outer wall portion. A dew condensation prevention angle duct, characterized in that an inner joint portion extending substantially parallel to the plate surface of the inner wall portion is provided at an end portion of the portion .

According to a second aspect of the present invention, in the dew condensation prevention angular duct according to the first aspect, an axial holding portion that holds the inner angular duct with respect to the axial direction is provided.

According to a third aspect of the present invention, in the dew condensation prevention rectangular duct according to the first or second aspect, the thickness maintaining portion is bent such that the outer side wall portion protrudes toward the inner side wall portion side and is bent. It is configured to be in contact with each other, or the inner wall portion is configured to project toward the outer wall portion side, be bent, and come into contact with the outer wall portion.

According to a fourth aspect of the present invention, in the dew condensation prevention rectangular duct according to the first to third aspects, the inner joint portion is folded in three so that an end portion of the inner side wall portion is substantially parallel to a plate surface of the inner side wall portion. The lower joint portion, the middle joint portion, and the upper joint portion are provided in order from the inner wall portion side, and the free end of the upper joint portion is more than the bent portion of the lower joint portion and the middle joint portion. With respect to the connected body having an inner joint portion having the same structure as the inner joint portion, the upper joint portion of the inner joint portion of the inner corner duct is set to a middle position with the upper joint portion of the inner joint portion of the connected body. Fitting between joint parts, or by fitting the upper joint part of the inner joint part of the connected body between the upper joint part and the middle joint part of the inner joint part of the inner corner duct, the inner corner The duct and the connected body are connected.

According to a fifth aspect of the present invention, in the dew condensation prevention rectangular duct according to the fourth aspect , the upper joint portion of the inner joint portion is provided with an engaging portion and an upper engaged portion, and the middle joint of the inner joint portion is provided. A middle locked portion is provided in the joint portion, and the upper joint portion of the inner joint portion of the inner corner duct is fitted between the upper joint portion and the middle joint portion of the inner joint portion of the connected body. The locking portion of the inner corner duct is locked to the middle locked portion of the connected body, and the locking portion of the connected body is locked to the upper locked portion of the inner corner duct. When the upper joint portion of the inner joint portion of the connected body is fitted between the upper joint portion and the middle joint portion of the joint portion of the inner corner duct, the locking portion of the connected body has the inner corner portion. It is characterized in that it is locked to the middle locked portion of the duct, and the locking portion of the inner corner duct is locked to the upper locked portion of the connected body.

According to a sixth aspect of the present invention, in the dew condensation prevention rectangular duct according to the fourth or fifth aspect , a reinforcing rib having a U-shaped cross section or an inverted U concave shape is provided in the upper joint portion of the inner joint portion, The upper joint portion of the inner joint portion of the inner corner duct is fitted between the upper joint portion and the middle joint portion of the inner joint portion of the connected body, or the upper joint portion of the inner joint portion of the connected body is The reinforcing ribs of the inner corner duct and the reinforcing ribs of the connected body overlap each other when they are fitted between the upper joint part and the middle joint part of the inner joint part of the inner corner duct.

According to a seventh aspect of the present invention, in the dew condensation prevention angular duct according to the fourth to sixth aspects, an axial holding portion that holds the inner angular duct with respect to an axial direction is provided, and the axial holding portion includes the axial holding portion. The outer wall portion is bent so as to project toward the inner wall portion side, and is configured to be in contact with a bent portion of the upper joint portion and the middle joint portion of the inner joint portion.

According to an eighth aspect of the present invention, in the dew condensation prevention rectangular duct according to the fourth or seventh aspect , in a state where the inner corner duct and the connected body are connected, the inner corner duct and the connected body are connected. It is characterized by comprising a connecting body which connects the corners of the inner joint portion.

According to a ninth aspect of the present invention, in the dew condensation prevention rectangular duct according to the eighth aspect , the connecting body is a substantially L-shaped body, a first connecting portion having a substantially C-shaped cross section and extending straight, and a cross section. A second C-shaped portion having a substantially C-shape and extending substantially at right angles from one end of the first connecting portion and having both ends of the C-shape openable and closable, the first connecting portion and the second connecting portion. The C-shaped opening of the connecting portion faces the inside of the L-shape, and the first inner joint portion is one of the inner joint portions of the inner corner duct, and the first inner joint portion is in a fitting relationship with the first inner joint portion. From the edge of the first overlapping portion where the first inner joint portion, which is the inner joint portion of the connected body, overlaps, within the C-shape of the first connecting portion, the end portion side of the first overlapping portion A second inner joint part which is an inner joint part adjacent to the first inner joint part of the inner corner duct, and an inner joint of the connected body in a fitting relationship with the second inner joint part. The second connecting portion is positioned on the end side of the second overlapping portion where the second inner joint portion, which is a portion, overlaps, and both ends of the C-shape are closed, and C of the second connecting portion is closed. By inserting the end portion side of the second overlapping portion into the character, the corner portions of the inner joint portion are connected.

The invention according to claim 10 is : an outer corner duct in which four plate-shaped outer wall portions are arranged in a substantially square tubular shape, and four plate-shaped inner side wall portions are arranged in a substantially square tubular shape, Maintaining the thickness of the inner corner duct disposed in the outer corner duct and the air layer between the outer corner duct and the inner corner duct to have a predetermined thickness so that the inner corner duct is retained in the outer corner duct. And an end portion of each of the outer wall portions is provided with an outer joint portion that extends substantially perpendicularly to a plate surface of the outer wall portion, and an end portion of each of the inner wall portions is provided with the outer joint portion. an inner joint portion is set eclipse to be substantially flush with the outer joint part extends substantially perpendicularly outwardly with respect to the plate surface of the inner wall portion, the outer joint part, an end portion of the outer wall portion, the plate A first outer wall vertical portion that is bent substantially perpendicular to the surface, and a second outer wall vertical portion that projects outward from the first outer wall vertical portion on the free end side of the first outer wall vertical portion And a first inner wall vertical portion in which the end portion of the inner wall portion is bent substantially perpendicular to the outside with respect to the plate surface, and the first inner wall vertical portion. It has a second inner wall vertical portion that is bent so as to overlap, and an inner wall horizontal portion that is bent substantially parallel to the plate surface of the inner wall portion, and the second inner wall vertical portion is the first inner wall vertical portion. The first inner wall vertical portion is substantially flush with the second outer wall vertical portion in a state of facing the outer wall vertical portion, and the inner wall horizontal portion abuts the outer wall portion to function as the thickness retaining portion. This is a dew condensation prevention rectangular duct.

According to an eleventh aspect of the present invention, in the dew condensation prevention rectangular duct according to the tenth aspect , the free end side of the second inner wall vertical portion is bent substantially parallel to the plate surface of the inner wall portion, and The inner wall horizontal portion is formed .

According to a twelfth aspect of the present invention, in the dew condensation prevention rectangular duct according to the tenth aspect , the end portion of the inner wall portion is bent so as to project toward the plate surface side of the inner wall portion, and the inner wall horizontal portion is formed. Is formed, and the free end side is bent with respect to the inner wall horizontal portion to form the first inner wall vertical portion and the second inner wall vertical portion .

According to a thirteenth aspect of the present invention, in the dew condensation prevention rectangular duct according to the eleventh or twelfth aspect , the second inner wall vertical portion is brought into contact with the first outer wall vertical portion, whereby the axial direction is reduced. It is characterized in that it functions as an axial holding portion for holding the inner corner duct.

According to the invention described in claim 1, since the heat insulating layer (air layer) having a predetermined thickness is provided between the outer corner duct and the inner corner duct, dew condensation can be prevented by the heat insulating layer without winding a heat insulating material. Is possible. As a result, it is possible to reduce the labor and time required for winding the heat insulating material, the disposal of the waste heat insulating material, and the like, which makes it easy to adjust the construction schedule, carry in and store the material, and reduce the number of personnel. It is possible to reduce the cost and improve the economical efficiency and safety.

Moreover, since the thickness of the air layer is maintained at a predetermined value by the thickness retaining portion, it is possible to stably prevent dew condensation for a long period of time.
Further, an outer joint portion that extends substantially vertically to the outside is provided at an end portion of each outer wall portion, and an inner joint portion that extends substantially parallel to the plate surface of the inner wall portion is provided at an end portion of each inner wall portion. It is provided. That is, since the outer joint portion and the inner joint portion are not parallel to each other and are located at a substantially right angle, the outer joint portion and the inner joint portion do not interfere with each other, and the joint work can be performed easily and reliably. Further, the inner joint portions can be temporarily fixed by connecting them first, and the outer joint portions can be connected easily and flexibly.

According to the invention described in claim 2, the inner corner duct is held in the axial direction by the axial holding portion. That is, since the inner corner duct does not move in the axial direction, the heat insulation layer can be stably formed and held by the outer corner duct and the inner corner duct, and as a result, dew condensation can be prevented stably over a long period of time. It will be possible.

According to the invention as set forth in claim 3, the outer wall portion is projected and bent toward the inner wall portion side, or the inner wall portion is projected and bent toward the outer wall portion side to form the thickness retaining portion. Since it is a simple structure, it can be manufactured easily and at low cost, and the heat insulating layer can be stably maintained at a predetermined thickness for a long period of time.

According to the invention described in claim 4 , the upper joint portion of the inner joint portion of the inner corner duct is fitted between the upper joint portion and the middle joint portion of the inner joint portion of the connected body, or the connected body. The inner corner duct and the connected body are connected to each other only by fitting the upper joint part of the inner joint part into the upper joint part and the middle joint part of the inner joint part of the inner corner duct. For this reason, it becomes possible to connect the inner corner duct and the connected body easily and in a short time, and it is also possible to connect properly in a narrow place or a high place without giving a heavy burden to the operator. Become. Moreover, since no tools are required, safe and easy work is possible.

In addition, among the four inner joint portions of the inner corner duct, in a certain inner joint portion, the upper joint portion is fitted between the upper joint portion and the middle joint portion of the inner joint portion of the connected body, and another In the inner joint portion, the upper joint portion of the inner joint portion of the connected body may be fitted between the upper joint portion and the middle joint portion. In other words, it does not matter which upper joint part of the inner corner duct or the connected body is fitted, but it does not matter which one is fitted. It will be possible to connect in time.

According to the invention of claim 5 , when the inner corner duct and the connected body are connected, the locking portion of the inner corner duct is locked to the middle locked portion of the connected body, and When the locking part of the connection body is locked to the upper locked part of the inner corner duct, or the locking part of the connected body is locked to the middle locked part of the inner corner duct, The locking portion of the duct is locked to the upper locked portion of the connected body. For this reason, it is possible to prevent and suppress separation of the inside corner duct and the connected body, and it is possible to connect properly and firmly.

According to the invention of claim 6 , since the reinforcing ribs are provided on the inner joint portion of the inner corner duct and the connected body, the inner joint portion becomes strong, and the inner corner duct and the connected body are properly and firmly attached. It is possible to connect to. Moreover, when the inside corner duct and the connected body are connected, the reinforcing ribs of the inside corner duct and the reinforcing ribs of the connected body overlap each other, so that the connection can be made more properly and firmly.

According to the invention as set forth in claim 7 , the outer side wall portion is protruded and bent toward the inner side wall portion side, abuts on the bent portion of the upper joint portion and the middle joint portion of the inner joint portion, and the axial direction holding portion. Has a simple structure that is formed and configured. That is, since only the bent portion of the inner joint portion is used by bending the outer wall portion, it is possible to easily and inexpensively manufacture, and it is possible to stably hold the inner corner duct for a long period of time. ..

According to the invention of claim 8 , in a state where the inner corner duct and the connected body are connected, the inner corner duct and the corner portion of the inner joint portion of the connected body are connected by the connecting body. It is possible to firmly maintain the connection between the rectangular duct and the connected body.

According to the invention of claim 9 , the inside corner duct and the end side of the first overlapping portion of the connected body are fitted into the C-shape of the first connection part of the joint body to form the inside corner duct. It is easy to position the second connecting part of the connecting body on the end side of the second overlapping part of the connected body, close both ends of the C-shape, and insert the end side of the second overlapping part. In addition, the corners of the inner joint can be properly connected. Moreover, since no tools are required, safe and easy work is possible.

According to the invention as set forth in claim 10 , since the air layer having a predetermined thickness is provided between the outer corner duct and the inner corner duct, it is possible to prevent dew condensation by the air layer without winding a heat insulating material. .. As a result, it is possible to reduce the labor and time required for winding the heat insulating material, the disposal of the waste heat insulating material, and the like, which makes it easy to adjust the construction schedule, carry in and store the material, and reduce the number of personnel. It is possible to reduce the cost and improve the economical efficiency and safety. Moreover, since the thickness of the air layer is maintained at a predetermined value by the thickness retaining portion, it is possible to stably prevent dew condensation for a long period of time.
Further, an outer joint portion that extends substantially vertically to the outside is provided at an end portion of each outer wall portion, and an inner joint portion that extends substantially vertically to the end portion of each inner wall portion and is substantially flush with the outer joint portion. Since it is provided, it is possible to simultaneously perform joint processing (connection work) on the outer joint portion and the inner joint portion on the same surface. That is, it is possible to jointly process the inner joint portion at the same time only by jointly treating the outer joint portion, and it is possible to reduce time and labor. In addition, since the inner joint portion does not protrude from the outer joint portion, it is possible to carry and handle it more easily and safely.
Further, the first inner wall vertical portion is substantially flush with the second outer wall vertical portion in a state where the second inner wall vertical portion faces the first outer wall vertical portion. That is, in a state in which the first inner wall vertical portion and the second inner wall vertical portion are accommodated in the step portion between the first outer wall vertical portion and the second outer wall vertical portion, the first inner wall vertical portion has the second outer wall vertical portion. Since it is substantially flush with the vertical portion, the outer joint portion and the inner joint portion are integrated, and the inner joint portion can be firmly jointed only by performing joint treatment on the outer joint portion.
Moreover, if the boundary between the outer joint portion and the inner joint portion, that is, the bent portion of the first inner wall vertical portion and the second inner wall vertical portion is sealed, leakage (air leakage) can be prevented. Since it is substantially flush with the outer wall vertical portion of No. 2, it is possible to easily and properly seal together with the second outer wall vertical portion.

According to the invention as set forth in claim 11, the inner wall horizontal portion having a simple structure in which the end portions of the inner wall portion are bent substantially parallel to each other functions as a thickness holding portion, and therefore can be manufactured easily and at low cost. At the same time, the air layer can be stably maintained at a predetermined thickness over a long period of time.

According to the invention as set forth in claim 13 , since the second inner wall vertical portion comes into contact with the first outer wall vertical portion to function as the axial direction holding portion, the structure is simplified, and the manufacturing can be performed easily and at low cost. At the same time, it becomes possible to stably hold the inner corner duct over a long period of time.

According to the invention described in claim 12, for having the free end side of the inner wall horizontal portion and the first inner wall vertical portion and second inner wall vertical section, forming easily and properly inner joint portion Is possible.

It is sectional drawing (DD sectional drawing of FIG. 2) which shows the arrangement|positioning relationship of the outer side wall part and inner side wall part of the dew condensation prevention square duct which concerns on Embodiment 1 of this invention. It is a perspective view which shows the dew condensation prevention angle duct which concerns on Embodiment 1 of this invention. It is a front view which shows the state before connecting the dew condensation prevention angle ducts of FIG. FIG. 3 is a perspective view showing an inner corner duct of the dew condensation prevention corner duct of FIG. 2. It is a figure which shows the junction part of the inside corner duct of FIG. 4, (a) shows the state which expanded the inside corner duct, (b) shows the state which closed the inside corner duct. It is a figure which shows the state which folded the inside corner duct of FIG. It is sectional drawing which shows the inner side joint part of the inner side corner duct of FIG. It is sectional drawing (D1-D1 sectional drawing of FIG. 15) which shows the state which connected the inner side joint parts of FIG. It is sectional drawing which shows a pair of outer joint part and inner joint part which oppose before connecting the dew condensation prevention angle ducts of FIG. It is sectional drawing which shows a pair of outer joint part and inner joint part which oppose in the state which connected the dew condensation prevention angle ducts of FIG. It is a perspective view which shows the connection body of the inside corner duct which concerns on Embodiment 2 of this invention, and shows the state which the both ends of the 2nd connection part opened. It is a perspective view which shows the state which the both ends of the 2nd connection part of the connection body of FIG. 11 closed. It is sectional drawing (D2-D2 sectional drawing of FIG. 15) which shows the state which attached the connection body of FIG. 11 to the inside corner duct. It is a perspective view which shows the state which attaches the connection body of FIG. 11 to an inner corner duct. It is a perspective view which shows the state which attached the connection body of FIG. 11 to the inside corner duct. It is a perspective view which shows the dew condensation prevention square duct which concerns on Embodiment 3 of this invention. FIG. 17 is a cross-sectional view (cross-sectional view taken along line DD of FIG. 16) showing an arrangement relationship between an outer wall portion and an inner wall portion of the dew condensation prevention angle duct of FIG. 16. It is sectional drawing which shows the outer side joint part and inner side joint part of the dew condensation prevention angle duct of FIG. It is sectional drawing which shows a pair of outer joint part and inner joint part which oppose before connecting the dew condensation prevention angle ducts of FIG. It is sectional drawing which shows a pair of outer joint part and inner joint part which oppose in the state which connected the dew condensation prevention angle ducts of FIG. FIG. 17 is a cross-sectional view (a view corresponding to a cross-sectional view taken along line D-D in FIG. 16) showing an arrangement relationship between an outer side wall part and an inner side wall part of a dew condensation preventing square duct according to a fourth embodiment of the present invention. It is sectional drawing which shows the outer side joint part and inner side joint part of the dew condensation prevention square duct which concerns on Embodiment 4 of this invention. It is sectional drawing which shows a pair of outer joint part and inner joint part which oppose before connecting the dew condensation prevention square ducts which concern on Embodiment 4 of this invention. It is sectional drawing which shows a pair of outer joint part and inner joint part which oppose in the state which connected the dew condensation prevention square duct which concerns on Embodiment 4 of this invention. It is a perspective view which shows the other form of this invention.

Hereinafter, the present invention will be described based on the illustrated embodiments.

(Embodiment 1)
1 to 10 show this embodiment, and FIG. 2 is a perspective view showing a condensation preventing square duct 101A according to this embodiment. The dew condensation prevention angular duct 101A is a square duct capable of preventing dew condensation, and has a double tubular structure including an outer corner duct 102A and an inner corner duct 103A arranged in the outer corner duct 102A. ing. Here, in this embodiment, as shown in FIG. 3, the connected body connected to the dew condensation prevention angle duct 101A has the same structure as the dew condensation prevention angle duct 101A (the length may be different). The case of the prevention angle duct 101B will be mainly described. Therefore, the dew condensation prevention angle duct 101A will be mainly described, and the dew condensation prevention angle duct 101B will be denoted by the same reference numerals as those of the dew condensation prevention angle duct 101A, and the description thereof will be omitted.

The outer corner duct 102A is a corner duct in which four plate-shaped outer wall portions 2 made of a corrosion-resistant steel plate are arranged in a substantially square tubular shape. The four outer wall portions 2 are provided at side edges along the axial direction. They are linked by the formed goby. Outer joint portions 21 for connecting to a connected body are formed at both axial end portions of each outer wall portion 2. That is, the outer joint portion 21 is a co-plate flange formed by bending the end portion of the outer wall portion 2 substantially perpendicularly, and with respect to the plate surface (the surface forming the cylinder, the main surface) of the outer wall portion 2. And extends substantially vertically to the outside (outside the cylinder). As shown in FIG. 2, corner pieces 6 each having an L-shaped flat plate and having bolt holes 6a formed at the corners are attached to the four corners adjacent to the outer joint portion 21 as described above. Further, as shown in FIG. 9, a band-shaped packing (gasket) 5 for airtightness is arranged on the outer surface (joint surface) of each outer joint portion 21.

Further, as shown in FIG. 1, a holding projection 22 is formed on the outer joint portion 21 side of each outer wall portion 2. The holding projection 22 has a rib shape in which the outer side wall portion 2 projects toward the inner side wall portion 3 and is bent, and is in contact with the inner side wall portion 3 and is connected to the upper joint portion 33 of the inner joint portion 30 described later and the middle joint. It is configured to come into contact with the bent portion 32b with the portion 32. As a result, the heat insulating layer S, which is an air layer between the outer corner duct 102A and the inner corner duct 103A (the outer wall portion 2 and the inner wall portion 3), has a predetermined thickness T, and the inner corner duct 103A has the outer corner duct 102A. The inside corner duct 103A is held (not to move) with respect to the axial direction while being held inside. In this way, the holding protrusion 22 serves as both the thickness holding portion and the axial holding portion. Here, the predetermined thickness T of the heat insulation layer S is set to such a thickness that condensation does not occur due to the heat insulation effect of the heat insulation layer S even when the temperature difference between the inside and outside of the condensation prevention corner duct 101A is large.

The inner square duct 103A is a square duct in which four plate-shaped inner wall portions 3 made of a corrosion-resistant steel plate are arranged in a substantially square tubular shape, and the connected body is provided at both axial end portions of each inner wall portion 3. An inner joint portion 30 is formed to connect with the inner joint portion 30. Here, the cross-sectional shapes of the outer corner duct 102A and the inner corner duct 103A are set so that the heat insulating layer S having the predetermined thickness T as described above is secured between the outer wall portion 2 and the inner wall portion 3. Has been done.

The inner corner duct 103A is a duct that can be folded and unfolded in this embodiment. That is, as shown in FIG. 4, the inner wall portions 3 are joined to each other at the side edge portions thereof, the joint portions 10 are rotatable, and the joint portions 10 rotate so that the inner wall portions 3 overlap each other. The whole can be folded or expanded into a cylinder. Specifically, as shown in FIG. 5, a curl-shaped single goby 3a is formed at one side edge portion extending in the longitudinal direction of the substantially rectangular inner wall portion 3 (the axial direction of the inner corner duct 103A). .. On the other hand, a curl-shaped double goby 3b that engages with the single goby 3a is formed at one side edge portion of the inner wall portion 3 adjacent to the inner wall portion 3 that extends in the longitudinal direction, and is joined by the single goby 3a and the double goby 3b. The section (spin goby) 10 is configured.

Then, in a state where the inner wall portion 3 and the inner wall portion 3 are positioned at a right angle (FIG. 5A, a state where the inner wall portion 3 is expanded into a tubular shape), one inner wall portion 3 is pushed toward the other inner wall portion 3 side. Then, the single goby 3a rotates about the double goby 3b, and one inner side wall portion 3 moves to the other inner side wall portion 3 side as shown in FIG. 5B. That is, as shown in FIG. 6, the entire inner wall portions 3 are folded (flattened) so as to overlap each other. Further, in this state, when one inner wall portion 3 is separated from the other inner wall portion 3 side, the single goby 3a rotates about the double goby 3b as an axis, and the four inner wall portions 3 are deployed in a tubular shape. It is a state. The reference numeral 3c in FIG. 5 is a tubular gasket.

The inner joint portion 30 is a joint portion that extends substantially parallel to the plate surface (the surface forming the cylinder, the main surface) of the inner wall portion 3, and as shown in FIG. It is folded in three in parallel with the plate surface of the inner wall portion 3, and a lower joint portion 31, a middle joint portion 32, and an upper joint portion 33 are provided in order from the inner wall portion 3 side. That is, the end portion of the inner wall portion 3 extends straight as it is, the lower joint portion 31, the middle joint portion 32 bent so as to overlap the lower joint portion 31, and the upper portion of the middle joint portion 32. And an upper joint portion 33 that is bent so as to overlap. The inner wall portions 3 are arranged such that the tip side of the inner joint portion 30 (the free end side of the upper joint portion 33) projects from the end portion (outer joint portion 21) of the outer corner duct 102A. ..

Further, the free end of the upper joint portion 33 extends so as to protrude from the bent portion 31 a of the lower joint portion 31 and the middle joint portion 32. That is, the length of the upper joint part 33 is set so that the upper joint part 33 substantially covers the lower joint part 31 and the middle joint part 32 of the inner corner duct 103B when connected to the inner corner duct 103B. There is.

Then, the upper joint portion 33 of the inner joint portion 30 of the inner corner duct 103A is fitted between the upper joint portion 33 and the middle joint portion 32 of the inner joint portion 30 of the inner corner duct 103B, or the inside of the inner corner duct 103B. The upper joint portion 33 and the middle joint portion 32 are arranged so that the upper joint portion 33 of the joint portion 30 can be fitted between the upper joint portion 33 and the middle joint portion 32 of the inner joint portion 30 of the inner corner duct 103A. A gap or the like is set, and by performing such fitting, the inner corner duct 103A and the inner corner duct 103B are connected and joined.

An airtight packing 4 is arranged at the bent portion 31a of the lower joint portion 31 and the middle joint portion 32 along the longitudinal direction (bent edge) of the bent portion 31a. Here, the cross section of the bent portion 31a is formed in a trapezoidal shape with a wide surface on which the packing 4 is arranged so that the packing 4 having a predetermined width can be arranged.

Then, as shown in FIG. 8, the upper joint portion 33 of the inner joint portion 30 of the inner corner duct 103A is fitted between the upper joint portion 33 and the middle joint portion 32 of the inner joint portion 30 of the inner corner duct 103B, or , When the upper joint portion 33 of the inner joint portion 30 of the inner corner duct 103B is fitted between the upper joint portion 33 and the middle joint portion 32 of the inner joint portion 30 of the inner corner duct 103A, The thickness of the packing 4 and the position of the bent portion 31a are set so that the packing 4 and the packing 4 of the inner corner duct 103B come into contact with each other. Here, the two packings 4 are set to be slightly compressed when they come into contact with each other to improve the airtightness.

The upper joint portion 33 of the inner joint portion 30 is provided with a locking portion 33a and the upper engaged portion 33b, and the middle joint portion 32 of the inner joint portion 30 is provided with a middle engaged portion 32a. ing. That is, as shown in FIG. 7, the free end portion of the upper joint portion 33 is formed with a locking portion 33a that is obliquely bent toward the inner wall portion 3 side along the free end edge, and the upper joint portion 33 has a free end portion. On the bent portion 32b side with the middle joint portion 32, a concave upper locked portion 33b that is recessed toward the inner wall portion 3 side is formed along the longitudinal direction (opening edge of the inner corner duct 103A). Further, on the bent portion 32b side of the middle joint portion 32, a convex middle engaged portion 32a protruding toward the side opposite to the inner side wall portion 3 is formed along the longitudinal direction. Here, the middle locked portion 32a is formed in a substantially triangular shape (a substantially right-angled triangle with an intruding side being inclined) so that the locking portion 33a can easily enter and can be properly locked.

When the upper joint portion 33 of the inner joint portion 30 of the inner corner duct 103A is fitted between the upper joint portion 33 and the middle joint portion 32 of the inner joint portion 30 of the inner corner duct 103B, as shown in FIG. In addition, the locking portion 33a of the inner corner duct 103A is locked to the middle locked portion 32a of the inner corner duct 103B, and the locking portion 33a of the inner corner duct 103B is locked to the upper locked portion of the inner corner duct 103A. Lock to 33b. On the other hand, when the upper joint portion 33 of the inner joint portion 30 of the inner corner duct 103B is fitted between the upper joint portion 33 and the middle joint portion 32 of the inner joint portion 30 of the inner corner duct 103A, the inner corner duct 103B The locking portion 33a is locked to the middle locked portion 32a of the inner corner duct 103A, and the locking portion 33a of the inner corner duct 103A is locked to the upper locked portion 33b of the inner corner duct 103B. In other words, the positions and shapes of the locking portion 33a, the upper locked portion 33b, and the middle locked portion 32a are set so as to lock in this way.

Further, the upper joint portion 33 of the inner joint portion 30 is provided with a reinforcing rib 33c having a U-shaped cross section in order to enhance strength and flatness. That is, as shown in FIG. 7, reinforcing ribs 33c having a U-shaped cross section recessed toward the inner wall 3 are provided on each of the engaging portion 33a side and the upper engaged portion 33b side of the upper joint portion 33. It is formed along the longitudinal direction.

Then, as shown in FIG. 8, the upper joint portion 33 of the inner joint portion 30 of the inner corner duct 103A is fitted between the upper joint portion 33 and the middle joint portion 32 of the inner joint portion 30 of the inner corner duct 103B, or , When the upper joint portion 33 of the inner joint portion 30 of the inner corner duct 103B is fitted between the upper joint portion 33 and the middle joint portion 32 of the inner joint portion 30 of the inner corner duct 103A, The position, shape, etc. of each reinforcing rib 33c are set so that the reinforcing rib 33c and the reinforcing rib 33c of the inner corner duct 103B overlap. In other words, the shape and size of the reinforcing ribs 33c are set so that the predetermined reinforcing effect and the flatness maintaining effect are obtained, and the reinforcing ribs 33c of the fitted inner corner ducts 103A and 103B overlap each other.

Next, a method for assembling the dew condensation prevention angle duct 101A having such a configuration and a method for connecting the dew condensation prevention angle duct 101B will be described.

First, in order to assemble the anti-condensation angular duct 101A, the inner angular duct 103A is expanded into a tubular shape, and as shown in FIG. The outer corner ducts 102A are formed by connecting the four outer wall parts 2 while contacting the wall parts 3 and the bent parts 32b. As a result, the inner corner duct 103A is arranged in the outer corner duct 102A, and the heat insulating layer S having a predetermined thickness T is provided between the outer corner duct 102A and the inner corner duct 103A.

Next, in order to connect the dew condensation prevention angle duct 101A and the dew condensation prevention angle duct 101B, first, as shown in FIG. 9, the end portions of the dew condensation prevention angle duct 101A and the dew condensation prevention angle duct 101B are opposed to each other, and As described above, the upper joint portion 33 of the inner joint portion 30 of the inner corner duct 103A is fitted between the upper joint portion 33 of the inner joint portion 30 of the inner corner duct 103B and the middle joint portion 32, or the inner corner duct 103B. The upper joint portion 33 of the inner joint portion 30 is inserted between the upper joint portion 33 and the middle joint portion 32 of the inner joint portion 30 of the inner corner duct 103A, and as shown in FIGS. The duct 103A and the inner corner duct 103B are connected. At this time, in the inner joint part 30 with the inner corner duct 103A, the upper joint part 33 of the inner corner duct 103A is fitted into the inner corner duct 103B, and in the other inner joint part 30 of the inner corner duct 103A, the inner corner duct 103B. The upper joint part 33 may be fitted into the inner corner duct 103A. That is, of the four inner joint portions 30 of the inner corner duct 103A, all the inner joint portions 30 may be fitted into the inner corner duct 103B, or some of the inner joint portions 30 may be fitted into the inner corner duct 103B. Alternatively, the inner corner ducts 103B may be fitted in all the inner joint portions 30.

When the inner corner duct 103A and the inner corner duct 103B are connected in this way, the packing 4 of the inner corner duct 103A and the packing 4 of the inner corner duct 103B come into contact with each other between all the inner joint parts 30, 30 facing each other. The inner joint portions 30 and 30 are hermetically sealed. In addition, the locking portion 33a of the inner corner duct 103A is locked to the middle locked portion 32a of the inner corner duct 103B, and the locking portion 33a of the inner corner duct 103B is the upper locked portion of the inner corner duct 103A. 33b, or the locking part 33a of the inner corner duct 103B is locked to the middle locked part 32a of the inner corner duct 103A, and the locking part 33a of the inner corner duct 103A is locked to the inner corner duct. The upper locked portion 33b of 103B is locked. Further, the reinforcing rib 33c of the inner corner duct 103A and the reinforcing rib 33c of the inner corner duct 103B overlap each other.

On the other hand, in this state, the packings 5 of the outer corner ducts 102A and 102B abut. Then, by inserting a bolt and tightening a nut into the bolt hole 6a of each corner piece 6 of the outer corner ducts 102A and 102B, the outer corner duct 102A and the outer corner duct 102B are connected. In this way, the dew condensation prevention angle duct 101A and the dew condensation prevention angle duct 101B are connected.

As described above, according to the dew condensation prevention angle duct 101A, since the heat insulation layer (air layer) S having the predetermined thickness T is provided between the outside corner duct 102A and the inside corner duct 103A, the temperature difference between the inside and outside of the duct is large. Even in such a case, the heat insulating layer S can prevent dew condensation without winding the heat insulating material. As a result, it is possible to reduce the labor and time required for winding the heat insulating material, the disposal of the waste heat insulating material, and the like, which makes it easy to adjust the construction schedule, carry in and store the material, and reduce the number of personnel. It is possible to reduce the cost and improve the economical efficiency and safety.

Moreover, since the heat insulating layer S is held at the predetermined thickness T by the holding projections 22, it is possible to stably prevent dew condensation for a long period of time.

Further, the holding projection 22 holds the inner corner duct 103A in the axial direction. That is, since the inner corner duct 103A does not move in the axial direction, the heat insulation layer S can be stably formed and held by the outer corner duct 102A and the inner corner duct 103A, and as a result, dew condensation can be stably carried out for a long period of time. It becomes possible to prevent it.

Moreover, the outer wall portion 2 projects toward the inner wall portion 3 and is bent to form the holding projection 22 as a thickness holding portion, which is a simple structure. Therefore, it can be manufactured easily and at low cost. The heat insulating layer S can be stably maintained at a predetermined thickness T for a long period of time.

Further, the outer side wall portion 2 is bent so as to project toward the inner side wall portion 3 side and abuts on the bent portion 32b of the upper joint portion 33 and the middle joint portion 32 of the inner joint portion 30 to hold it as an axial holding portion. It has a simple structure in which the protrusions 22 are formed and configured. That is, since the outer wall portion 2 is bent and only the bent portion 32b of the inner joint portion 30 is used, the inner corner duct 103A can be stably manufactured over a long period of time while being manufactured easily and at low cost. Is possible.

On the other hand, an outer joint portion 21 that extends substantially vertically to the outside is provided at an end portion of each outer wall portion 2, and an end portion of each inner wall portion 3 extends substantially parallel to the plate surface of the inner wall portion 3. The inner joint portion 30 is provided. That is, since the outer joint portion 21 and the inner joint portion 30 are not parallel to each other and are positioned substantially at right angles, the outer joint portion 21 and the inner joint portion 30 do not interfere with each other, and the joint work can be performed easily and reliably. Becomes Further, the inner joint portions 30 can be temporarily fixed by connecting them first, and the outer joint portions 21 can be easily and flexibly connected.

Specifically, the upper joint portion 33 of the inner joint portion 30 of the inner corner duct 103A is fitted between the upper joint portion 33 and the middle joint portion 32 of the inner joint portion 30 of the inner corner duct 103B, or By simply fitting the upper joint portion 33 of the inner joint portion 30 of 103B between the upper joint portion 33 and the middle joint portion 32 of the inner joint portion 30 of the inner corner duct 103A, the inner corner duct 103A and the inner corner duct 103B can be formed. Are connected. Therefore, it becomes possible to connect the inner corner duct 103A and the inner corner duct 103B easily and in a short time, and also in a narrow place or a high place properly without imposing a great burden on the operator (the connecting point It becomes possible to connect (without leakage, etc.). Moreover, since no tools are required, safe and easy work is possible. Then, by simply fastening the bolts and nuts at the corner pieces 6 of the outer corner ducts 102A and 102B, the outer corner ducts 102A and 102B can be connected easily and quickly to connect the dew condensation prevention corner ducts 101A and 101B. it can.

In addition, among the four inner joint portions 30 of the inner corner duct 103A, in a certain inner joint portion 30, the upper joint portion 33 thereof is replaced with the upper joint portion 33 and the middle joint portion 32 of the inner joint portion 30 of the inner corner duct 103B. The upper joint part 33 of the inner joint part 30 of the inner corner duct 103B may be fitted between the upper joint part 33 and the middle joint part 32 of the other inner joint part 30. That is, since it does not matter which of the inner corner duct 103A and the inner corner duct 103B is fitted, the upper joint portion 33 can be fitted, so that the operator does not need to care which one is fitted, and more It becomes possible to connect easily and in a short time.

Further, when the inner corner duct 103A and the inner corner duct 103B are connected, the locking portion 33a of the inner corner duct 103A is locked to the middle locked portion 32a of the inner corner duct 103B, and the inner corner duct 103B is locked. The locking portion 33a is locked to the upper locked portion 33b of the inner corner duct 103A, or the locking portion 33a of the inner corner duct 103B is locked to the middle locked portion 32a of the inner corner duct 103A. Then, the locking portion 33a of the inner corner duct 103A is locked to the upper locked portion 33b of the inner corner duct 103B. Therefore, the inner corner duct 103A and the inner corner duct 103B are prevented from being separated from each other, and can be properly and firmly connected.

Further, since the reinforcing rib 33c is provided on the inner joint portion 30 of the inner corner duct 103A and the inner corner duct 103B, the inner joint portion 30 becomes strong, and the inner corner duct 103A and the inner corner duct 103B are properly and firmly connected. It becomes possible to do. Moreover, when the inner corner duct 103A and the inner corner duct 103B are connected, the reinforcing rib 33c of the inner corner duct 103A and the reinforcing rib 33c of the inner corner duct 103B overlap each other, so that more appropriate and strong connection is possible. Become.

(Embodiment 2)
11 to 15 show this embodiment. In this embodiment, the structure is different from that of the first embodiment in that the connecting body 7 is provided, and the same structures as those of the first embodiment are denoted by the same reference numerals and the description thereof will be omitted.

The connecting body 7 is a metal object that connects the inner corner duct 103A and the corner C of the inner corner duct 103B in a state where the inner corner duct 103A and the inner corner duct 103B are connected. Specifically, as shown in FIG. 12, a first connecting portion 71 having a substantially L-shaped body as a whole and a substantially C-shaped cross section and extending straight, and a first connecting portion having a substantially C-shaped cross section. And a second connecting portion 72 extending substantially at right angles from one end of 71, and the C-shaped openings of the first connecting portion 71 and the second connecting portion 72 face the inside of the L-shape. That is, a rectangular main surface portion 73, vertical portions (end portions) 74 that vertically project from both side edges of the main surface portion 73, and horizontal portions that project from the end edges of both vertical portions 74 in parallel to the main surface portion 73. (End portion) 75 having a C-shaped cross section is bent in the central portion so that the vertical portion 74 and the horizontal portion 75 face the inside of the L shape, A first connecting portion 71 and a second connecting portion 72 are formed.

Moreover, both ends of the C-shape of the second connecting portion 72 can be opened and closed. That is, as shown in FIG. 11, perforations 76 are formed at the boundary between the main surface portion 73 and the vertical portion 74 of the second connecting portion 72, and both vertical portions 74 are opened before use (during manufacturing). Are arranged substantially flush with the main surface portion 73. When the vertical portions 74 are bent at the perforations 76, the vertical portions 74 are closed as shown in FIG.

Such a connecting body 7 is attached as follows. Here, as shown in FIG. 14, the inner angle with the first and the inner joint portion 30 ₁ is one of the inner joint portion 30 of the inner angle duct 103A, to the first inner joint portion 30 ₁ and the fitting relationship The overlap of the _first inner joint portion 30 ₁ , which is the inner joint portion 30 of the duct 103B, is referred to as a first overlapping portion 30A. Also, a second inner joint portion 30 ₂ which is the inner joint portion 30 adjacent to the first inner joint portion 30 ₁ of the inner corner duct 103A, and an inner corner which is in a fitting relationship with the _second inner joint portion 30 _2. The second inner joint portion 30 ₂ which is the inner joint portion 30 of the duct 103B overlaps with each other and is referred to as a second overlap portion 30B. Then, a case where the connecting body 7 is attached to the corner portion C ₁ configured by the first overlapping portion 30A and the second overlapping portion 30B will be described as an example.

First, in a state where both vertical portions 74 of the second connecting portion 72 shown in FIG. 11 are open, as shown in FIG. 14, from the edge of the first overlapping portion 30A, the C-shaped portion of the first connecting portion 71 is formed. The end side of the first overlapping portion 30A is fitted into the inside. At this time, by inserting the end edge of the first overlapping portion 30A between the vertical portions 74 of the first connecting portion 71 and sliding the first connecting portion 71 along the first overlapping portion 30A. The end portion side of the first overlapping portion 30A is accommodated in the space (in the C shape) formed by the both vertical portions 74 and the both horizontal portions 75.

Then, the first connecting portion 71 is slid until the main surface portion 73 of the second connecting portion 72 contacts the second overlapping portion 30B, and the second connecting portion is connected to the end portion side of the second overlapping portion 30B. Position the part 72. Subsequently, both ends of the C-shape of the second connecting portion 72, that is, both vertical portions 74 are closed, and as shown in FIG. 15, the second overlapping portion 30B of the second overlapping portion 30B is inserted into the C-shape of the second connecting portion 72. The end side is inserted and accommodated. As a result, the corner C ₁ is connected by the connecting body 7.

In such an attached state, the first connecting portion 71 and the second connecting portion 72 are fitted to the first overlapping portion 30A and the second overlapping portion 30B, as shown in FIG. Here, the 1st connection part 71 is demonstrated. That is, the main surface portion 73 of the first connecting portion 71 faces the upper joint portion 33 of the inner joint portion 30, the both vertical portions 74 face the bent portion 32b of the inner joint portion 30, and the both horizontal portions 75 face each other. Each is located between the lower joint portion 31 and the middle joint portion 32 of the inner joint portion 30.

On the other hand, in this embodiment, the position of the holding projection 22 of each outer wall portion 2 of the outer corner duct 102A is set so as to abut on the vertical portion 74 of the connecting body 7. That is, the holding projection 22 contacts the connecting body 7, whereby the inner corner duct 103A does not move in the axial direction.

Thus, according to this embodiment, since the inner corner duct 103A and the inner corner duct 103B are connected to each other, the corner portion C formed by the inner corner duct 103A and the inner corner duct 103B is connected by the connecting body 7. It is possible to firmly maintain the connection and shape between the inner corner duct 103A and the inner corner duct 103B.

At this time, for example, the end portions of the first overlapping portions 30A of the inner corner duct 103A and the inner corner duct 103B are fitted into the C-shape of the first joint portion 71 of the joint body 7 to slide the joint body 7. Then, the corner portions C can be easily and properly connected by simply closing both vertical portions 74 of the second connecting portion 72 and fitting the end portion side of the second overlapping portion 30B. Moreover, since no tools are required, safe and easy work is possible.

(Embodiment 3)
16 to 20 show this embodiment. In this embodiment, as shown in FIGS. 16 and 17, outer joint portions 21 are provided at both ends of each outer wall portion 2 and extend substantially perpendicularly to the plate surface of the outer wall portion 2. In that the inner joint portions 30 that extend substantially perpendicular to the plate surface of the inner wall portion 3 and that are substantially flush with the outer joint portion 21 are provided at both ends of each inner wall portion 3. The configuration different from that of the first embodiment and the same configuration as that of the first embodiment will be denoted by the same reference numerals and the description thereof will be omitted.

As shown in FIG. 18, the outer joint portion 21 has a first end in which the end portion of the outer wall portion 2 is bent substantially outwardly (perpendicular to the axial direction and opposite to the inner wall portion 3 side) with respect to the plate surface. The outer wall vertical portion 211 and the second outer wall vertical portion 212 projecting outward (on the axially opposite outer wall portion 2 side) from the first outer wall vertical portion 211 at the free end side of the first outer wall vertical portion 211. Have and. That is, both the first outer wall vertical portion 211 and the second outer wall vertical portion 212 extend substantially perpendicular to the plate surface of the outer wall portion 2, and the first outer wall vertical portion 211 and the second outer wall vertical portion 212. There is a step portion 211a between the two.

As will be described later, the width of the step portion 211a (the amount of protrusion of the second outer wall vertical portion 212 from the first outer wall vertical portion 211) is in the state where the inner wall vertical portions 301 and 302 are housed in the step portion 211a. The first inner wall vertical portion 301 is set to be substantially flush with the second outer wall vertical portion 212. Further, the height T2 of the step portion 211a, that is, the first outer wall vertical portion 211, is the height T2 of the first inner wall vertical portion 301 and the second inner wall vertical portion when the inner wall vertical portions 301 and 302 are accommodated in the step portion 211a. A large gap is not formed between the bent portion 301a of 302 and the corner of the step portion 211a. Specifically, the height T2, that is, the height of the second inner wall vertical portion 302, which will be described later, is set to be slightly smaller than the height of the second outer wall vertical portion 212, and the bent portion 301a is provided at the center of the outer joint portion 21. Is located.

On the other hand, on the free end side of the second outer wall vertical portion 212, a piece accommodating portion 213 that is bent substantially parallel to the plate surface of the outer wall portion 2, and further, the free end side of the piece accommodating portion 213 is an outer wall portion. The first piece stop portion 214 is formed so as to be bent substantially inward with respect to the second plate surface. Further, a convex second piece stop portion 215 protruding outward is formed on the outer joint portion 21 side of the outer wall portion 2. Then, the corner piece 6 is sandwiched between the outer joint portion 21 (first outer wall vertical portion 211) and the second piece stop portion 215 in the plate thickness direction, and the first piece stop portion 214 is bent toward the corner piece 6 side. Then, the corner piece 6 is housed and mounted in the piece housing portion 213.

The inner joint portion 30 includes a first inner wall vertical portion 301 in which an end portion of the inner wall portion 3 is bent outward (perpendicular to the axial direction and on the outer wall portion 2 side) substantially perpendicular to a plate surface, and a first inner wall vertical portion 301. Second inner wall vertical portion 302 that is bent toward the inner wall portion 3 so as to overlap the inner wall vertical portion 301, and the free end side of the second inner wall vertical portion 302 is substantially parallel to the plate surface of the inner wall portion 3. And an inner wall horizontal portion 303 that is bent to a horizontal direction. That is, the inner wall vertical portions 301 and 302 overlap each other and extend substantially perpendicularly to the inner wall portion 3, and the second inner wall vertical portion 302 extends the inner wall horizontal portion 303 substantially parallel to the inner wall portion 3. Here, the height T1 of the inner wall horizontal portion 303 from the plate surface of the inner wall portion 3 is equal to that of the outer wall portion 2 and the inner wall portion 3 when the inner wall horizontal portion 303 is in contact with the inner surface of the outer wall portion 2. The heat insulating layer S having a predetermined thickness T is set between the two.

Then, as shown in FIG. 17, the first inner wall vertical portion 301 is substantially flush with the second outer wall vertical portion 212 with the second inner wall vertical portion 302 facing the first outer wall vertical portion 211. Therefore, the inner wall horizontal portion 303 comes into contact with the outer wall portion 2 and functions as a thickness retaining portion. That is, the overlapping portion of the inner wall vertical portions 301 and 302 is accommodated in the step portion 211a of the outer joint portion 21, the first inner wall vertical portion 301 becomes substantially flush with the second outer wall vertical portion 212, and the inner wall The horizontal portion 303 is in contact with the outer wall portion 2, and a heat insulating layer S having a predetermined thickness T is secured between the outer wall portion 2 and the inner wall portion 3.

Further, in this state, the second inner wall vertical portion 302 abuts on the first outer wall vertical portion 211, whereby the inner wall vertical portions 301 and 302 function as the axial direction holding portion, and the inner angle with respect to the axial direction. Duct 103A is stuck.

On the other hand, as shown in FIG. 18, on the free end side of the inner wall horizontal portion 303, a vertical reinforcing portion 304 that is bent inward substantially perpendicularly to the plate surface of the inner wall portion 3 is provided. The horizontal portion 303 is reinforced. Similarly, at the position of the inner wall portion 3 facing the inner wall horizontal portion 303, a convex convex reinforcing portion 305 protruding toward the inner wall horizontal portion 303 side is provided, whereby the inner wall portion 3 and the inner joint portion are provided. 30 is reinforced.

Further, as shown in FIG. 19, a band-like packing 5 for airtightness is arranged so as to straddle the second outer wall vertical portion 212 and the first inner wall vertical portion 301 around the bent portion 301a.

Then, in order to connect the dew condensation prevention angle duct 101A and the dew condensation prevention angle duct 101B having such a configuration, the following may be performed. That is, as shown in FIG. 20, the packings 5 of the dew condensation prevention angle ducts 101A and 101B, that is, the outer joint portions 21 and the inner joint portions 30 are combined to each other, and the bolts of the corner pieces 6 of the outer corner ducts 102A and 102B are combined. Insert the bolt into the hole 6a and tighten the nut. As a result, the outer joint portions 21 of the dew condensation prevention angle ducts 101A and 101B are connected to each other, and the inner wall vertical portions 301 and 302 are sandwiched by the first outer wall vertical portion 211 of the outer joint portion 21, and the inner joint portion 30 is formed. The two are connected to each other.

As described above, according to this embodiment, the outer joint portion 21 that extends substantially vertically outward is provided at the end of each outer wall portion 2, and the outer joint portion 21 extends substantially vertically outward at the end portion of each inner wall portion 3. Since the inner joint portion 30 that is substantially flush with the outer joint portion 21 is provided, the outer joint portion 21 and the inner joint portion 30 can be joint-processed (connection work) simultaneously on the same surface. That is, it is possible to jointly process the inner joint portion 30 at the same time by merely jointing the outer joint portion 21 (fastening the corner pieces 6 with bolts), and it is possible to reduce time and labor. Moreover, since the inner joint portion 30 does not project from the outer joint portion 21, it becomes possible to carry and handle the joint easily and safely.

In addition, the end portion of the inner wall portion 3 is bent outward substantially vertically, and is further bent substantially parallel to form inner wall vertical portions (axial direction holding portions) 301 and 302 and an inner wall horizontal portion (thickness holding portion) 303. Since the structure is simple, it can be manufactured easily and at low cost, and the heat insulating layer S can be stably maintained at a predetermined thickness for a long period of time.

More specifically, in a state where the second inner wall vertical portion 302 faces the first outer wall vertical portion 211, the first inner wall vertical portion 301 is substantially flush with the second outer wall vertical portion 212. That is, with the first inner wall vertical portion 301 and the second inner wall vertical portion 302 housed in the step portion 211a between the first outer wall vertical portion 211 and the second outer wall vertical portion 212, the first inner wall vertical portion Since 301 is substantially flush with the second outer wall vertical portion 212, the outer joint portion 21 and the inner joint portion 30 are integrated, and the inner joint portion 30 can be formed by simply performing joint treatment on the outer joint portion 21. It is possible to perform joint processing firmly.

Moreover, leakage (air leakage) can be prevented by sealing the boundary between the outer joint portion 21 and the inner joint portion 30, that is, the bent portion 301a of the first inner wall vertical portion 301 and the second inner wall vertical portion 302. Since the bent portion 301a is substantially flush with the second outer wall vertical portion 212 and is located at the center of the outer joint portion 21, the second outer wall vertical portion 212 can be easily and properly sealed together (packing 5 Can be attached). In other words, if the packing 5 is attached to the vicinity of the center of the outer joint portion 21 without worrying about the position, the packing 5 can surely cover the bent portion 301a, which is the leak point, and the sealing can be performed easily and properly. Becomes On the other hand, when there is a leaked portion (bent portion 301a or the like) at the end of the outer joint portion 21, it is necessary to perform sealing so as to cover this end, which not only takes time and labor but also needs to be properly performed. There may be cases where they are not sealed.

Further, since the second inner wall vertical portion 302 functions as the axial holding portion by contacting the first outer wall vertical portion 211, the structure is simple, and the manufacturing is easy and low cost, and is stable for a long period of time. It becomes possible to hold the inner corner duct 103A.

(Embodiment 4)
21 to 24 show this embodiment. In this embodiment, as shown in FIGS. 21 and 22, a first inner wall vertical portion 301 and a second inner wall vertical portion 302 are provided on the free end side of the inner wall horizontal portion 303 of the inner joint portion 30. In this respect, the configuration is different from that of the third embodiment, and the same components as those of the third embodiment are designated by the same reference numerals and the description thereof will be omitted.

The inner joint portion 30 includes an inner wall horizontal portion 303 that is bent so that an end portion of the inner wall portion 3 projects toward the plate surface side (inner side) of the inner wall portion 3, and a free end side is inside the inner wall horizontal portion 303. A first inner wall vertical portion 301 bent outward substantially perpendicular to the plate surface of the wall portion 3 and a second inner wall vertical portion 302 bent so as to overlap the first inner wall vertical portion 301. Have. That is, in the inner joint portion 30 that extends substantially perpendicularly to the plate surface of the inner wall portion 3, the inner wall horizontal portion 303 is formed on the plate surface side (root side) of the inner wall portion 3, and the inner wall vertical portion is formed on the free end side. 301 and 302 are formed so as to overlap each other, and the first inner wall vertical portion 301 is located outside (on the side of the inner joint portion 30 of the connection partner).

Here, the inner wall horizontal portion 303 is formed so as to extend obliquely from the plate surface side of the inner wall portion 3 and then extend substantially horizontally to the plate surface of the inner wall portion 3. Further, the height T1 of the inner wall horizontal portion 303 from the plate surface of the inner wall portion 3 is the height of the outer wall portion 2 and the inner wall portion 3 in the state where the inner wall horizontal portion 303 is in contact with the inner surface of the outer wall portion 2. It is set so that a heat insulating layer S having a predetermined thickness T is secured therebetween.

Then, as shown in FIG. 21, with the second inner wall vertical portion 302 facing the first outer wall vertical portion 211, the first inner wall vertical portion 301 is substantially flush with the second outer wall vertical portion 212. Therefore, the inner wall horizontal portion 303 comes into contact with the outer wall portion 2 and functions as a thickness retaining portion. That is, the overlapping portion of the inner wall vertical portions 301 and 302 is accommodated in the step portion 211a of the outer joint portion 21, the first inner wall vertical portion 301 becomes substantially flush with the second outer wall vertical portion 212, and the inner wall The horizontal portion 303 is in contact with the outer wall portion 2, and a heat insulating layer S having a predetermined thickness T is secured between the outer wall portion 2 and the inner wall portion 3.

Further, in this state, the second inner wall vertical portion 302 abuts on the first outer wall vertical portion 211, whereby the inner wall vertical portions 301 and 302 function as the axial direction holding portion, and the inner angle with respect to the axial direction. Duct 103A is stuck.

Further, as shown in FIG. 23, a band-shaped packing 5 for airtightness is arranged so as to extend over the second outer wall vertical portion 212 and the first inner wall vertical portion 301.

Then, in order to connect the dew condensation prevention angle duct 101A and the dew condensation prevention angle duct 101B having such a configuration, the following may be performed. That is, as shown in FIG. 24, the packings 5 of the dew condensation prevention rectangular ducts 101A and 101B, that is, the outer joint portions 21 and the inner joint portions 30 are combined to bolt the corner pieces 6 of the outer corner ducts 102A and 102B. Insert the bolt into the hole 6a and tighten the nut. As a result, the outer joint portions 21 of the dew condensation prevention angle ducts 101A and 101B are connected to each other, and the inner wall vertical portions 301 and 302 are sandwiched by the first outer wall vertical portion 211 of the outer joint portion 21, and the inner joint portion 30 is formed. The two are connected.

Thus, according to this embodiment, the same effect as that of the third embodiment can be obtained. Moreover, since the first inner wall vertical portion 301 and the second inner wall vertical portion 302 are provided on the free end side of the inner wall horizontal portion 303, the inner joint portion 30 can be easily and properly formed.

Although the embodiments of the present invention have been described above, the specific configuration is not limited to the above-mentioned embodiments, and even if there is a design change or the like within a range not departing from the gist of the present invention, Included in the invention. For example, in the above-described embodiment, the case where the connected body is the dew condensation prevention angle duct 101B having the same structure as the dew condensation prevention angle duct 101A has been described, but the connected body may be another air conditioner such as a chamber or a pipe joint. It may be.

Further, in Embodiments 1 and 2, the thickness retaining portion (retaining protrusion 22) is provided on the outer wall portion 2, but the inner wall portion 3 projects toward the outer wall portion 2 side and is bent to form the thickness retaining portion. Alternatively, the outer wall portion 2 may be brought into contact with the outer wall portion 2. Further, the thickness holding portion and the axial holding portion may be configured separately from the outer wall portion 2 and the inner wall portion 3.

For example, as shown in FIG. 25, a band-shaped thickness holding member (thickness holding portion) 8 may be attached to the outer circumference of the inner corner duct 103A. The thickness maintaining member 8 is provided with connecting portions 82 at both ends of the strip-shaped body 81, and tooth portions 83 of the geta extending substantially perpendicularly to the strip-shaped body 81 are provided between the connecting portions 82. Then, the four thickness maintaining members 8 are connected to each other by the connecting portions 82 so that the outer circumference of the inner corner duct 103A is wound once, and a predetermined portion is provided between the outer corner duct 102A and the inner corner duct 103A with the tooth portions 83 of the geta. The heat insulating layer S having the thickness T is secured.

Further, the shapes of the outer joint portion 21 and the inner joint portion 30 in the third embodiment are not limited to the above. For example, without providing the second inner wall vertical portion 302, the first inner wall vertical portion 301 that is substantially flush with the outer joint portion 21, and the inner wall horizontal portion that abuts the outer wall portion 2 and functions as a thickness retaining portion. You may make it provide 303.

101A Dew Condensation Prevention Duct 101B Dew Condensation Prevention Duct (Connected Object)
102A Outer corner duct 103A Inner corner duct 2 Outer wall part 21 Outer joint part 22 Holding protrusion (thickness holding part, axial holding part)
211 First Outer Wall Vertical Section 211a Stepped Section 212 Second Outer Wall Vertical Section 3 Inner Side Wall Section 30 Inner Joint Section 30 ₁ First Inner Joint Section 30 ₂ Second Inner Joint Section 30A First Overlap Section 30B Second Overlapping part 31 lower joint part 31a bent part 32 middle joint part 32a middle locked part 32b bent part 33 upper joint part 33a locking part 33b upper locked part 33c reinforcing rib 301 first inner wall vertical part ( Axial holding part)
301a Bent portion 302 Second inner wall vertical portion (axial holding portion)
303 Inner wall horizontal part (thickness holding part)
4, 5 Packing 6 Corner piece 7 Connecting body 71 First connecting portion 72 Second connecting portion 73 Main surface portion 74 Vertical portion (end portion)
75 Horizontal part (end part)
8 Thickness holding member (thickness holding part)
S heat insulation layer T predetermined thickness

Claims (13)

An outer corner duct in which four plate-shaped outer wall portions are arranged in a substantially square tubular shape,
An inner square duct in which the four plate-shaped inner side wall portions are arranged in a substantially rectangular tubular shape, and the inner square duct is arranged in the outer square duct;
A thickness retaining portion that retains the inner corner duct in the outer corner duct, with an air layer having a predetermined thickness between the outer corner duct and the inner corner duct,
Equipped with
An outer joint portion is provided at an end of each of the outer wall portions, the outer joint portion extending substantially perpendicular to the plate surface of the outer wall portion,
An inner joint portion that extends substantially parallel to the plate surface of the inner wall portion is provided at an end of each inner wall portion,
This is a dew condensation prevention angle duct. An axial holding portion that holds the inner corner duct with respect to the axial direction is provided.
The dew condensation prevention rectangular duct according to claim 1, wherein The thickness retaining portion is configured such that the outer wall portion projects toward the inner wall portion side and is bent to abut against the inner wall portion, or the inner wall portion projects toward the outer wall portion side and is bent. Abutting on the outer wall,
The dew condensation prevention angle duct according to claim 1 or 2, characterized in that. In the inner joint portion, the end portion of the inner wall portion is folded in three substantially parallel to the plate surface of the inner wall portion, and a lower joint portion, a middle joint portion, and an upper joint portion are arranged in order from the inner wall portion side. Provided, the free end of the upper joint portion protrudes more than the bent portion of the lower joint portion and the middle joint portion,
With respect to the connected body having the inner joint portion having the same structure as the inner joint portion, the upper joint portion of the inner joint portion of the inner corner duct is the upper joint portion and the middle joint portion of the inner joint portion of the connected body. , Or by fitting the upper joint portion of the inner joint portion of the connected body between the upper joint portion and the middle joint portion of the inner joint portion of the inner corner duct, the inner corner duct and The connected body is connected,
The dew condensation prevention angle duct according to any one of claims 1 to 3 , characterized in that: The upper joint portion of the inner joint portion is provided with a locking portion and an upper engaged portion, and the middle joint portion of the inner joint portion is provided with a middle engaged portion,
When the upper joint part of the inner joint part of the inner corner duct is fitted between the upper joint part and the middle joint part of the inner joint part of the connected body, the locking part of the inner corner duct is connected to the connected part. Locking to the middle locked portion of the body, the locking portion of the connected body is locked to the upper locked portion of the inner corner duct,
When the upper joint portion of the inner joint portion of the connected body is fitted between the upper joint portion and the middle joint portion of the joint portion of the inner corner duct, the locking portion of the connected body is the inner corner duct. Locking to the middle locked portion, and the locking portion of the inner corner duct locks to the upper locked portion of the connected body,
The dew condensation prevention square duct according to claim 4 , wherein Reinforcing ribs having a U-shaped cross section or an inverted U concave shape are provided in the upper joint portion of the inner joint portion,
The upper joint portion of the inner joint portion of the inner corner duct is fitted between the upper joint portion and the middle joint portion of the inner joint portion of the connected body, or the upper joint portion of the inner joint portion of the connected body. When fitted between the upper joint part and the middle joint part of the inner joint part of the inner corner duct, the reinforcing ribs of the inner corner duct and the reinforcing ribs of the connected body overlap each other,
The dew condensation prevention angle duct according to claim 4 or 5 , wherein An axial holding portion that holds the inner corner duct with respect to the axial direction is provided,
The axial direction holding portion is configured such that the outer side wall portion is protruded and bent toward the inner side wall portion side, and is in contact with a bent portion of the upper joint portion and the middle joint portion of the inner joint portion. ,
The dew condensation prevention angle duct according to any one of claims 4 to 6 characterized by things. A state in which the inside corner duct and the connected body are connected to each other, a connecting body for connecting the inside corner duct and a corner portion of an inner joint portion of the connected body,
The dew condensation prevention angle duct according to claim 4 or 7 , characterized in that. The connecting body is a substantially L-shaped body, has a first connecting portion having a substantially C-shaped cross section and extending straight, and having a substantially C-shaped cross section and extending at a substantially right angle from one end of the first connecting portion to a C shape. A second connecting portion whose both ends are openable and closable, and the C-shaped openings of the first connecting portion and the second connecting portion face the inside of the L-shape,
A first inner joint portion which is one of the inner joint portions of the inner corner duct, and a first inner joint portion which is an inner joint portion of the connected body in a fitting relationship with the first inner joint portion. From the edge of the first overlapping portion where the two overlap, the end portion side of the first overlapping portion is fitted into the C-shape of the first connecting portion, and the first inner joint portion of the inner corner duct A second inner joint portion, which is an adjacent inner joint portion, and a second inner joint portion, which is an inner joint portion of the connected body in a fitting relationship with the second inner joint portion, are overlapped with each other. The second connecting portion is positioned on the end side of the overlapping portion to close both ends of the C-shape, and the end portion side of the second overlapping portion is fitted into the C-shape of the second connecting portion. By connecting the corners of the inner joint portion,
The dew condensation prevention rectangular duct according to claim 8 , wherein An outer corner duct in which four plate-shaped outer wall portions are arranged in a substantially square tubular shape,
An inner square duct in which the four plate-shaped inner side wall portions are arranged in a substantially rectangular tubular shape, and the inner square duct is arranged in the outer square duct;
A thickness retaining portion that retains the inner corner duct in the outer corner duct, with an air layer having a predetermined thickness between the outer corner duct and the inner corner duct,
Equipped with
An outer joint portion is provided at an end of each of the outer wall portions, the outer joint portion extending substantially perpendicular to the plate surface of the outer wall portion,
Wherein the end of each inner wall portion, an inner joint portion to be substantially flush with the outer joint part extends substantially perpendicularly outwardly with respect to the plate surface of the inner side wall portion is set vignetting,
The outer joint portion includes a first outer wall vertical portion in which an end portion of the outer wall portion is bent outwardly substantially perpendicular to a plate surface, and a first outer wall vertical portion at a free end side of the first outer wall vertical portion. And a second outer wall vertical portion projecting outward from the outer wall vertical portion of 1,
The inner joint portion is bent such that an end portion of the inner wall portion is overlapped with a first inner wall vertical portion that is bent substantially perpendicularly outward with respect to a plate surface and the first inner wall vertical portion. A second inner wall vertical portion, and an inner wall horizontal portion bent substantially parallel to the plate surface of the inner wall portion,
In a state where the second inner wall vertical portion faces the first outer wall vertical portion, the first inner wall vertical portion is substantially flush with the second outer wall vertical portion, and the inner wall horizontal portion is the outer side. Abutting on the wall portion and functioning as the thickness holding portion,
This is a dew condensation prevention angle duct. The free end side of the second inner wall vertical portion is bent substantially parallel to the plate surface of the inner wall portion to form the inner wall horizontal portion,
The dew condensation prevention angle duct according to claim 10 , wherein The inner wall horizontal portion is formed by bending an end portion of the inner wall portion so as to project toward the plate surface side of the inner wall portion, and the first inner wall is formed by bending a free end side of the inner wall horizontal portion. A vertical portion and the second inner wall vertical portion are formed,
The dew condensation prevention angle duct according to claim 10 , wherein By contacting the second inner wall vertical portion with the first outer wall vertical portion, the second inner wall vertical portion functions as an axial holding portion that holds the inner angular duct with respect to the axial direction.
The dew condensation prevention angle duct according to any one of claims 11 and 12, wherein:

Images