JP2019200036A - Dew condensation prevention square duct - Google Patents

Abstract

To provide a dew condensation prevention square duct that can prevent dew condensation without winding a thermal insulation material.SOLUTION: A dew condensation prevention square duct includes: an outside square duct 102A in which four plate-like outside wall parts 2 are arranged into a substantially square cylindrical shape; an inside square duct 103A in which four plate-like inside wall parts 3 are arranged into a substantially square cylindrical shape, and which is arranged inside the outside square duct 102A; and a holding projection 22 for making a thermal insulation layer S between the outside square duct 102A and the inside square duct 103A become a predetermined thickness T to hold the inside square duct 103A inside the outside square duct 102A.SELECTED DRAWING: Figure 1

Description

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

  In air-conditioning ducts and the like, heat insulation may be applied to the ducts at the installation site in order to prevent condensation (see, for example, Patent Document 1). That is, after the duct is attached to a predetermined installation location such as in the ceiling, a sheet-like (strip-shaped) heat insulating material made of glass wool is wound around the outer periphery of the duct. Such an insulation process is usually performed by an enforcement contractor different from the enforcement contractor who installs the duct by bringing the thermal insulation into the field separately from the duct.

JP 2008-089288 A

  However, such heat insulation treatment is performed in a state in which the duct is arranged in the ceiling or the like, so that the construction is difficult, and not only does the construction require a lot of labor and time, but also the waste material of the insulation material is not installed at the installation site. Will occur and will require disposal. Especially in recent years, construction and construction schedules and construction and construction costs, including disposal costs, have been severely restricted and managed at construction sites. There is an urgent need not to generate it.

  In addition, since the enforcement contractor that installs the duct is different from the enforcement contractor that performs the heat insulation treatment, it is difficult and complicated to adjust the construction schedule, and it is necessary to secure a storage place for the insulation separately from the duct. The loading and storage adjustment was complicated. In addition, more people are required, which not only increases the cost, but also has a risk of impairing safety.

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

  In order to achieve the above object, the invention according to claim 1 is directed to an outer corner duct in which four plate-like outer wall portions are arranged in a substantially square cylindrical shape, and four plate-like inner wall portions are substantially square. An inner corner duct disposed in the outer corner duct, and a heat insulation layer between the outer corner duct and the inner corner duct are set to have a predetermined thickness, and the inner corner duct is moved to the outer corner duct. A dew condensation prevention angle duct, comprising: a thickness holding portion held in the duct.

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

  According to a third aspect of the present invention, in the dew condensation prevention angular duct according to the first or second aspect, the thickness holding portion is bent so that the outer wall portion protrudes toward the inner wall portion. It is configured to be in contact with each other, or the inner wall portion is bent so as to protrude toward the outer wall portion, and is in contact with the outer wall portion.

  According to a fourth aspect of the present invention, in the dew condensation prevention angular duct according to the first to third aspects, an outer side that extends substantially perpendicularly to the outer side with respect to the plate surface of the outer side wall part at the end of each outer side wall part. A joint portion is provided, and an inner joint portion extending substantially parallel to the plate surface of the inner wall portion is provided at an end portion of each inner wall portion.

  According to a fifth aspect of the present invention, in the dew condensation prevention angular duct according to the fourth aspect, the inner joint portion is formed by folding the end portion of the inner wall portion into three substantially parallel to the plate surface of the inner wall portion. The lower joint part, the middle joint part, and the upper joint part are provided in order from the inner wall part side, and the free end of the upper joint part protrudes from the bent part of the lower joint part and the middle joint part, The upper joint part of the inner joint part of the inner corner duct is connected to the upper joint part and middle joint part of the inner joint part of the connected body with respect to the connected body having the inner joint part of the same structure as the inner joint part. Or by fitting the upper joint portion of the inner joint portion of the body to be connected between the upper joint portion and the middle joint portion of the inner joint portion of the inner corner duct, The connected body is connected.

  The invention according to claim 6 is the dew condensation prevention angular duct according to claim 5, wherein the upper joint portion of the inner joint portion is provided with a locking portion and a higher locked portion, When 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 inserted 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 locking portion of the connected body, and the locking portion of the connected body is locked to the upper locking portion of the inner corner duct. When the upper joint portion of the inner joint portion of the connected body is inserted 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 portion. Locking to the middle locked portion of the duct, the locking portion of the inner corner duct is locked to the upper locked portion of the connected body.

  The invention according to claim 7 is the dew condensation prevention angular duct according to claim 5 or 6, wherein a reinforcing rib having a U-shaped cross section or a reverse 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 rib of the inner corner duct and the reinforcing rib of the body to be connected overlap when fitted between the upper joint portion and the middle joint portion of the inner joint portion of the inner corner duct.

  According to an eighth aspect of the present invention, in the dew condensation prevention angular duct according to the fifth to seventh aspects, the axial direction holding portion is bent so that the outer wall portion protrudes toward the inner wall portion, and the inner joint portion. The upper joint portion and the middle joint portion are in contact with a bent portion.

  The invention according to claim 9 is the dew condensation prevention angular duct according to any one of claims 5 to 8, wherein the inner corner duct and the connected body are connected to each other. It is provided with the connection object which connects the corner of an inner joint part.

  The invention according to claim 10 is the dew condensation prevention angular duct according to claim 9, wherein the connecting body is substantially L-shaped, has a substantially C-shaped cross section, and extends straight. Having a substantially C-shape and extending from the one end of the first connecting portion at a substantially right angle, 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 that is one of the inner joint portions of the inner corner duct, and the first inner joint portion are 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, the end portion side of the first overlapping portion in the C-shape of the first connecting portion The second inner joint portion which is an inner joint portion adjacent to the first inner joint portion of the inner corner duct, and the second inner joint portion are in a fitting relationship. The second coupling portion is positioned on the end portion side of the second overlapping portion where the second inner joint portion that is the inner joint portion of the connection body overlaps, and both ends of the C-shape are closed, The corner portion of the inner joint portion is connected by inserting the end portion side of the second overlapping portion into the C-shape of the second connecting portion.

  An eleventh aspect of the present invention is the dew condensation prevention angular duct according to any one of the first to third aspects, wherein an outer side extending substantially perpendicularly to the outer side with respect to the plate surface of the outer wall portion at the end of each outer wall portion. A joint portion is provided, and an inner joint portion that extends substantially perpendicular to the outer side with respect to the plate surface of the inner wall portion and is substantially flush with the outer joint portion is provided at the end of each inner wall portion. It is characterized by that.

  According to a twelfth aspect of the present invention, in the dew condensation prevention angular duct according to the eleventh aspect, the inner joint portion is a first in which an end portion of the inner wall portion is bent substantially perpendicularly to the outer side with respect to the plate surface. The inner wall vertical portion and an inner wall horizontal portion bent substantially parallel to the plate surface, the first inner wall vertical portion being substantially flush with the outer joint portion, and the inner wall horizontal portion being It is in contact with the outer wall part and functions as the thickness holding part.

  According to a thirteenth aspect of the present invention, in the dew condensation prevention angular duct according to the eleventh aspect, the outer joint portion is a first in which an end portion of the outer wall portion is bent substantially perpendicularly outward with respect to the plate surface. An outer wall vertical portion, and a second outer wall vertical portion protruding outward from the first outer wall vertical portion on the free end side of the first outer wall vertical portion, and the inner joint portion includes the inner wall A first inner wall vertical portion whose end portion is bent substantially perpendicularly outward with respect to the plate surface; a second inner wall vertical portion bent so as to overlap the first inner wall vertical portion; The free end side of the second inner wall vertical portion has an inner wall horizontal portion bent substantially parallel to the plate surface of the inner wall portion, and the second inner wall vertical portion becomes the first outer wall vertical portion. In a state of being opposed to each other, the first inner wall vertical portion is substantially flush with the second outer wall vertical portion, and the inner wall horizontal portion abuts the outer wall portion and Functions as the thickness retaining part, characterized in that.

  According to a fourteenth aspect of the present invention, in the dew condensation prevention angular duct according to the thirteenth aspect, the second inner wall vertical portion abuts on the first outer wall vertical portion, whereby the inner angle with respect to the axial direction is increased. It functions as an axial direction holding part that holds the duct.

  According to a fifteenth aspect of the present invention, in the dew condensation prevention angular duct according to the eleventh aspect, the outer joint portion is a first in which an end portion of the outer wall portion is bent substantially perpendicularly outward with respect to the plate surface. An outer wall vertical portion, and a second outer wall vertical portion protruding outward from the first outer wall vertical portion on the free end side of the first outer wall vertical portion, and the inner joint portion includes the inner wall The inner wall horizontal portion bent so that the end portion of the wall portion protrudes toward the plate surface side of the inner wall portion, and the free end side of the inner wall horizontal portion is substantially perpendicular to the plate surface of the inner wall portion. And a second inner wall vertical portion bent so as to overlap the first inner wall vertical portion, and the second inner wall vertical portion is the first outer wall. The first inner wall vertical portion is substantially flush with the second outer wall vertical portion in a state facing the vertical portion, and the inner wall horizontal portion is the outer wall. Functioning as the thickness retaining part in contact with, and wherein the.

  According to a sixteenth aspect of the present invention, in the dew condensation prevention angular duct according to the fifteenth aspect, the second inner wall vertical portion abuts on the first outer wall vertical portion, so that the inner angle with respect to the axial direction is increased. It functions as an axial direction holding part that holds the duct.

  According to the first aspect of the present invention, since the heat insulating layer (air layer) having a predetermined thickness is provided between the outer corner duct and the inner corner duct, it is possible to prevent condensation by the heat insulating layer without winding the heat insulating material. Is possible. As a result, it is possible to reduce the labor and time required to wrap the insulation, the disposal of waste insulation, etc., as well as the adjustment of the construction schedule, the introduction of materials, the adjustment of storage, etc. It becomes possible to improve economy and safety by reducing.

  And since a heat insulation layer is hold | maintained by predetermined thickness by the thickness holding | maintenance part, it becomes possible to prevent dew condensation stably over a long period of time.

  According to the second aspect of the present invention, the inner corner duct is held in the axial direction by the axial holding portion. In other words, 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, it is possible to prevent condensation stably over a long period of time. It becomes possible.

  According to the third aspect of the present invention, the outer wall portion protrudes and bends toward the inner wall portion side, or the inner wall portion protrudes and bends toward the outer wall portion side to form and constitute the thickness holding portion. Since the structure is simple, it can be manufactured easily and at low cost, and the heat insulating layer can be stably maintained at a predetermined thickness over a long period of time.

  According to the invention described in claim 4, the outer joint portion extending substantially perpendicularly to the outside is provided at the end portion of each outer wall portion, and the end portion of each inner wall portion is provided with respect to the plate surface of the inner wall portion. And an inner joint portion extending substantially in parallel. That is, since the outer joint portion and the inner joint portion are not parallel but are positioned substantially at right angles, the outer joint portion and the inner joint portion can be easily and reliably performed without interference. Moreover, it can fix temporarily by connecting inner joint parts previously, and it becomes possible to connect the outer joint parts easily and flexibly.

  According to the invention described in claim 5, 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 body to be connected are connected only by fitting the upper joint portion of the inner joint portion between the upper joint portion and the middle joint portion of the inner joint portion 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 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.

  Further, among the four inner joint portions of the inner corner duct, in a certain inner joint portion, the upper joint portion is inserted between the upper joint portion and the middle joint portion of the inner joint portion of the body to be connected. In the inner joint portion, the upper joint portion of the inner joint portion of the body to be connected may be inserted between the upper joint portion and the middle joint portion. In other words, since it is only necessary to insert the upper joint portion of the inner corner duct or the connected body, it is not necessary to worry about which one to insert, and it is easier and shorter. It becomes possible to connect in time.

  According to the invention described in claim 6, 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, When the locking part of the connecting 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 engaging portion of the duct is engaged with the upper engaged portion of the connected body. For this reason, it is possible to prevent and suppress separation of the inner corner duct and the connected body, and to connect appropriately and firmly.

  According to the seventh aspect of the invention, since the reinforcing ribs are provided in the inner corner duct and the inner joint portion of the connected body, the inner joint portion becomes strong, and the inner corner duct and the connected body are properly and firmly secured. It becomes possible to connect to. In addition, when the inner corner duct and the body to be connected are connected, the reinforcing rib of the inner corner duct and the reinforcing rib of the body to be connected are overlapped, so that it is possible to connect more appropriately and firmly.

  According to the eighth aspect of the present invention, the outer wall portion projects and bends toward the inner wall portion, contacts the bent portion of the upper joint portion and the middle joint portion of the inner joint portion, and the axial holding portion. Has a simple structure that is simply formed and constructed. That is, since the outer wall portion is bent and only the bent portion of the inner joint portion is used, it can be manufactured easily and at a low cost, and the inner corner duct can be stably held for a long period of time. .

  According to the ninth aspect of the invention, in the state where the inner corner duct and the body to be connected are connected, the corner portion of the inner joint portion of the inner corner duct and the body to be connected is coupled by the coupling body. It is possible to firmly maintain the connection between the rectangular duct and the connected body.

  According to the invention described in claim 10, the inner corner duct and the end portion of the first overlapping portion of the connected body are fitted into the C-shape of the first coupling portion of the coupling body, and the inner corner duct and Easy by simply positioning the second connecting part of the connecting body on the end side of the second overlapping part of the connected body, closing both ends of the C-shape and inserting the end part side of the second overlapping part And the corner | angular part of an inner side joint part can be connected appropriately. Moreover, since no tools are required, safe and easy work is possible.

  According to the eleventh aspect of the present invention, an outer joint portion extending substantially perpendicularly to the outside is provided at an end portion of each outer wall portion, and an outer joint portion extending substantially perpendicularly to the outside at an end portion of each inner wall portion. Since the inner joint portion that is substantially flush with the inner joint portion is provided, the outer joint portion and the inner joint portion can be jointed (connected) simultaneously on the same surface. That is, only by performing joint processing on the outer joint portion, the inner joint portion can be jointed at the same time, and time and labor can be reduced. Moreover, since the inner joint portion does not protrude from the outer joint portion, transportation and handling can be performed more easily and safely.

  According to the twelfth aspect of the present invention, the end of the inner wall portion is bent substantially perpendicularly to the outside, and is further bent substantially in parallel so that the first inner wall vertical portion and the inner wall horizontal portion (thickness holding portion) Since it is a simple structure that is simply formed and configured, it can be manufactured easily and at low cost, and the heat insulating layer can be stably maintained at a predetermined thickness over a long period of time.

  According to the thirteenth aspect of the present invention, 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. In other words, the first inner wall vertical portion is the second outer wall in a state where 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. 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 processing on the outer joint portion.

  Moreover, leakage (air leakage) can be prevented by sealing 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. Since the second outer wall vertical portion is substantially flush with the second outer wall vertical portion, it can be easily and properly sealed together with the second outer wall vertical portion. In addition, since the inner wall horizontal part with a simple structure in which the end part of the inner wall part is bent substantially in parallel functions as the thickness holding part, it can be manufactured easily and at low cost, and is stably insulated over a long period of time. It becomes possible to keep the layer at a predetermined thickness.

  According to the invention described in claim 14, since the second inner wall vertical portion functions as an axial holding portion by contacting the first outer wall vertical portion, the configuration becomes simple and can be manufactured easily and at low cost. At the same time, the inner corner duct can be stably held for a long period of time.

  According to the fifteenth aspect of the invention, the same effect as that of the thirteenth aspect can be obtained. In addition, since the first inner wall vertical part and the second inner wall vertical part are provided on the free end side of the inner wall horizontal part, the inner joint part can be formed easily and appropriately.

  According to the sixteenth aspect of the invention, the same effect as that of the fourteenth aspect can be obtained.

It is sectional drawing (DD sectional drawing of FIG. 2) which shows the arrangement | positioning relationship between 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 angular 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. It is a perspective view which shows the inner side corner duct of the dew condensation prevention corner duct of FIG. It is a figure which shows the junction part of the inner side corner duct of FIG. 4, (a) shows the state which expand | deployed the inner side corner duct, (b) shows the state which closed the inner side corner duct. It is a figure which shows the state which folded the inner side corner duct of FIG. It is sectional drawing which shows the inner side coupling 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 joint parts of FIG. It is sectional drawing which shows a pair of opposing outer joint part and inner joint part before connecting the dew condensation prevention angle ducts of FIG. It is sectional drawing which shows a pair of opposing outer joint part and inner joint part 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 inner side 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 coupling body of FIG. 11 to the inner side corner duct. It is a perspective view which shows the state which attaches the coupling body of FIG. 11 to an inner side corner duct. It is a perspective view which shows the state which attached the coupling body of FIG. 11 to the inner side corner duct. It is a perspective view which shows the dew condensation prevention square duct which concerns on Embodiment 3 of this invention. It is sectional drawing (DD sectional drawing of FIG. 16) which shows the arrangement | positioning relationship between the outer side wall part and inner side wall part of the dew condensation prevention rectangular duct of FIG. It is sectional drawing which shows the outer joint part and inner joint part of the dew condensation prevention corner duct of FIG. It is sectional drawing which shows a pair of opposing outer joint part and inner joint part before connecting the dew condensation prevention corner ducts of FIG. It is sectional drawing which shows a pair of opposing outer joint part and inner joint part in the state which connected the dew condensation prevention angle ducts of FIG. It is sectional drawing (figure equivalent to DD sectional drawing of FIG. 16) which shows the arrangement | positioning relationship of the outer wall part and inner wall part of the dew condensation prevention square duct which concerns on Embodiment 4 of this invention. It is sectional drawing which shows the outer joint part and inner joint part of the dew condensation prevention rectangular duct which concern on Embodiment 4 of this invention. It is sectional drawing which shows a pair of opposing outer joint part and inner joint part before connecting the dew condensation prevention angle duct which concerns on Embodiment 4 of this invention. It is sectional drawing which shows a pair of opposing outer joint part and inner joint part in the state which connected the dew condensation prevention angle ducts which concern on Embodiment 4 of this invention. It is a perspective view which shows the other form of this invention.

  The present invention will be described below based on the illustrated embodiments.

(Embodiment 1)
1 to 10 show this embodiment, and FIG. 2 is a perspective view showing a dew condensation prevention angular duct 101A according to this embodiment. This condensation prevention corner duct 101A is a corner duct capable of preventing condensation, and has a double tubular structure including an outer corner duct 102A and an inner corner duct 103A disposed in the outer corner duct 102A. ing. Here, in this embodiment, as shown in FIG. 3, the connected body connected to the condensation prevention corner duct 101A has the same structure as the condensation prevention corner 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-like outer wall portions 2 made of a corrosion-resistant steel plate are arranged in a substantially square cylindrical shape, and the four outer wall portions 2 are formed on side edges along the axial direction. They are linked by formed goby. Outer joint portions 21 for connecting to a body to be connected 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 of the outer wall portion 2 (surface that forms a cylinder, main surface). And extends substantially perpendicularly to the outside (cylinder outside). As shown in FIG. 2, corner pieces 6 having L-shaped flat plates with bolt holes 6a formed at the corners are mounted at the four corners adjacent to the outer joint portion 21. Further, on the outer surface (joint surface) of each outer joint portion 21, as shown in FIG. 9, a band-shaped packing (gasket) 5 for airtightness is disposed.

  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 wall portion 2 projects and bends toward the inner wall portion 3 side, abuts against the inner wall portion 3, and an upper joint portion 33 and a middle joint of the inner joint portion 30 described later. It is comprised so that the bending part 32b with the part 32 may be contact | abutted. Thereby, the heat insulation 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) is set to a predetermined thickness T, and the inner corner duct 103A is changed to the outer corner duct 102A. The inner corner duct 103A is held (so as not to move) with respect to the axial direction. Thus, the holding protrusion 22 has both a thickness holding part and an axial direction holding part. Here, the predetermined thickness T of the heat insulating layer S is set to a thickness that does not cause dew condensation due to the heat insulating effect of the heat insulating layer S even when the temperature difference between the inside and outside of the dew condensation preventing angular duct 101A is large.

  The inner corner duct 103A is a corner duct in which four plate-shaped inner wall portions 3 made of a corrosion-resistant steel plate are arranged in a substantially square cylindrical shape, and connected to both ends of each inner wall portion 3 in the axial direction. The inner joint part 30 for connecting to is formed. 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.

  In addition, in this embodiment, the inner corner duct 103A is a duct that can be folded and unfolded. That is, as shown in FIG. 4, it joins in the side edge part of the adjacent inner wall part 3, the joint part 10 is free to rotate, and the inner wall part 3 overlaps when the joint part 10 rotates. The whole can be folded or expanded into a cylindrical shape. Specifically, as shown in FIG. 5, a curled single goby 3a is formed on 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 gob 3b that engages with the single goby 3a is formed on one side edge portion extending in the longitudinal direction of the inner wall 3 adjacent to the inner wall 3 and joined by the single gob 3a and the double gob 3b. A part (spin goby) 10 is configured.

  Then, in a state where the inner wall portion 3 and the inner wall portion 3 are positioned at right angles (FIG. 5A, a state where the inner wall portion 3 is expanded in a cylindrical 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 as shown in FIG. 5B, one inner wall 3 moves to the other inner wall 3 side. That is, as shown in FIG. 6, the entire inner wall portion 3 is folded (flattened) so as to overlap each other. Furthermore, when one inner wall part 3 is separated from the other inner wall part 3 side from this state, the single goby 3a rotates around the double gob 3b, and the four inner wall parts 3 are developed into a cylindrical shape. It becomes a state. In addition, the code | symbol 3c in FIG. 5 is a tube-shaped 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. The lower joint part 31, the intermediate joint part 32, and the upper joint part 33 are provided in order from the inner wall part 3 side by being folded in three substantially parallel to the plate surface of the inner wall part 3. That is, the lower joint portion 31 in which the end portion of the inner wall portion 3 extends straight as it is, the middle joint portion 32 bent so as to overlap the lower joint portion 31, and the upper joint portion 32 above. An upper joint portion 33 that is bent so as to overlap with the upper joint portion 33. Each inner side wall part 3 is arrange | positioned so that the front end side (the free end side of the high-order joint part 33) of such an inner joint part 30 may protrude from the edge part (outer joint part 21) of the outer corner duct 102A. .

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

  Then, the upper joint portion 33 of the inner joint portion 30 of the inner corner duct 103A is inserted between the upper joint portion 33 of the inner joint portion 30 and the middle joint portion 32 of the inner corner duct 103B, or the inner corner duct 103B The upper joint portion 33 and the middle joint portion 32 are fitted so that the upper joint portion 33 of the joint portion 30 is fitted between the upper joint portion 33 of the inner joint portion 30 and the middle joint portion 32 of the inner corner duct 103A. By setting a gap or the like and performing such insertion, the inner corner duct 103A and the inner corner duct 103B are connected and joined.

  In addition, an airtight packing 4 is disposed along the longitudinal direction (bending edge) of the bent portion 31a at the bent portion 31a of the lower joint portion 31 and the middle joint portion 32. 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 disposed so that the packing 4 having a predetermined width can be disposed.

  And, 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 of the inner joint portion 30 and the middle joint portion 32 of the inner corner duct 103A, 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, when abutting, both packings 4 are set to be slightly compressed to improve airtightness.

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

  When the upper joint portion 33 of the inner joint portion 30 of the inner corner duct 103A 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 103B, as shown in FIG. Further, 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. 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, shapes, and the like 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.

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

  And, 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 of the inner joint portion 30 and the middle joint portion 32 of the inner corner duct 103A, the inner corner duct 103A The position, shape, and the like 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 rib 33c are set so that a predetermined reinforcing effect and flatness maintaining effect can be obtained, and the reinforcing ribs 33c of the inserted inner corner ducts 103A, B overlap.

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

  First, in order to assemble the dew condensation prevention angular duct 101A, the inner angular duct 103A is developed into a cylindrical shape, and each outer wall 2 is opposed to the inner wall 3 as shown in FIG. The outer corner duct 102A is formed by connecting the four outer wall portions 2 while contacting the wall portion 3 and the bent portion 32b. Thus, the inner corner duct 103A is disposed 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 condensation prevention corner duct 101A and the condensation prevention corner duct 101B, first, as shown in FIG. 9, the end portions of the condensation prevention corner duct 101A and the condensation prevention corner duct 101B are opposed to each other. Thus, 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 and the middle joint portion 32 of the inner corner duct 103B, 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 portion 30 with the inner corner duct 103A, the upper joint portion 33 of the inner corner duct 103A is inserted into the inner corner duct 103B, and in the other inner joint portion 30 in the inner corner duct 103A, the inner corner duct 103B. The upper joint portion 33 may be fitted into the inner corner duct 103A. That is, among 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 are fitted into the inner corner duct 103B. Alternatively, the inner corner duct 103B may be fitted into 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 are in contact with each other between all the inner joint portions 30, 30 facing each other. The space between the inner joint portions 30 and 30 is hermetically sealed. Further, 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. The locking portion 33a of the inner corner duct 103B 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 the inner corner duct. It will be in the state latched by 103B upper part latching part 33b. Further, the reinforcing rib 33c of the inner corner duct 103A and the reinforcing rib 33c of the inner corner duct 103B overlap.

  On the other hand, the packing 5 of the outer corner ducts 102A and 102B abuts in this state. Then, the outer corner duct 102A and the outer corner duct 102B are connected by inserting a bolt into the bolt hole 6a of each corner piece 6 of the outer corner duct 102A, 102B and tightening the nut. In this way, the condensation prevention corner duct 101A and the condensation prevention corner 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 a predetermined thickness T is provided between the outer corner duct 102A and the inner corner duct 103A, the temperature difference between the inside and outside of the duct is large. Even in the case, it is possible to prevent condensation by the heat insulating layer S without winding the heat insulating material. As a result, it is possible to reduce the labor and time required to wrap the insulation, the disposal of waste insulation, etc., as well as the adjustment of the construction schedule, the introduction of materials, the adjustment of storage, etc. It becomes possible to improve economy and safety by reducing.

  In addition, since the heat insulating layer S is held at the predetermined thickness T by the holding protrusions 22, it is possible to prevent condensation stably over a long period of time.

  Further, the inner corner duct 103 </ b> A is held in the axial direction by the holding protrusion 22. 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. It becomes possible to prevent.

  Moreover, since the outer wall 2 protrudes toward the inner wall 3 and is bent to form a holding protrusion 22 as a thickness holding portion, it can be manufactured easily and at a low cost. It becomes possible to hold the heat insulation layer S at a predetermined thickness T stably over a long period of time.

  Furthermore, the outer wall 2 protrudes and bends toward the inner wall 3, contacts the bent portion 32 b of the upper joint 33 and the middle joint 32 of the inner joint 30, and holds 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 2 is bent and only the bent portion 32b of the inner joint portion 30 is used, the inner corner duct 103A can be held stably for a long period of time while being easily and inexpensively manufactured. Is possible.

  On the other hand, an outer joint portion 21 extending substantially perpendicularly to the outside is provided at an end portion of each outer wall portion 2, and extends substantially parallel to the plate surface of the inner wall portion 3 at an end portion of each inner wall portion 3. An inner joint portion 30 is provided. That is, since the outer joint portion 21 and the inner joint portion 30 are not parallel but positioned substantially at a right angle, the outer joint portion 21 and the inner joint portion 30 can be easily and reliably joined without interference. It becomes. In addition, 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 the inner corner duct 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 Is connected. This makes it possible to connect the inner corner duct 103A and the inner corner duct 103B easily and in a short time. It is possible to connect without leaking connection. Moreover, since no tools are required, safe and easy work is possible. Then, by simply fastening 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 easily and quickly connected to connect the dew condensation prevention angle ducts 101A and 101B. it can.

  Of the four inner joint portions 30 of the inner corner duct 103A, in one inner joint portion 30, the upper joint portion 33 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. In another inner joint portion 30, the upper joint portion 33 of the inner joint portion 30 of the inner corner duct 103 </ b> B may be inserted between the upper joint portion 33 and the middle joint portion 32. That is, regardless of which upper joint portion 33 of the inner corner duct 103A or the inner corner duct 103B is inserted, the upper joint portion 33 may be inserted, so that the operator does not need to worry about which one is inserted. It is 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 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. Thus, the locking portion 33a of the inner corner duct 103A is locked to the upper locked portion 33b of the inner corner duct 103B. For this reason, separation of the inner corner duct 103A and the inner corner duct 103B is prevented and suppressed, and it becomes possible to connect appropriately and firmly.

  Further, since the reinforcing rib 33c is provided in 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 connected appropriately and firmly. It becomes possible to do. In addition, 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, so that it is possible to connect more appropriately and firmly. Become.

(Embodiment 2)
11 to 15 show this embodiment. In this embodiment, the configuration is different from that of the first embodiment in that it has a connecting body 7, and the description of the same configuration as that of the first embodiment is omitted by attaching the same reference numerals.

  The connecting body 7 is a hardware that connects the corners C of the inner corner duct 103A and 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, the first connecting portion 71 that is generally L-shaped as a whole, has a substantially C-shaped cross section and extends straight, and the first connecting portion has 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, a vertical portion (end portion) 74 that protrudes vertically from both side edges of the main surface portion 73, and a horizontal portion that protrudes in parallel to the main surface portion 73 from the end edges of both the vertical portions 74. A member having a C-shaped cross section having (end portion) 75 is bent at the central portion so that the vertical portion 74 and the horizontal portion 75 face the inside of the L-shape, and the second portion with the bent portion as a boundary. One connecting portion 71 and a second connecting portion 72 are formed.

  Further, both ends of the C-shape of the second connecting portion 72 can be opened and closed. That is, as shown in FIG. 11, a perforation 76 is 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 manufacture). The main surface portion 73 is substantially flush with the main surface portion 73. Then, when the vertical portions 74 are bent at the perforation 76, the vertical portions 74 are closed as shown in FIG.

Such a coupling 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 those first inner joint portion 30 ₁ is an inner joint portion 30 of the duct 103B overlaps the first overlapping portion 30A. The inner angle with the second of the inner joint portion 30 ₂ is the inner joint portion 30 adjacent to the first inner joint portion 30 ₁ of the inner corner duct 103A, to the second inner joint portion 30 ₂ and the fitting relationship those second and inner joint portion 30 ₂ is the inner joint portion 30 of the duct 103B overlaps the second overlapped portion 30B. Then, the formed corner portion C ₁ in the first overlapping portion 30A and the second overlapping portion 30B, illustrating a case of attaching the coupling body 7 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, the C-shape of the first connecting portion 71 is formed from the edge of the first overlapping portion 30A. The end portion side of the first overlapping portion 30A is inserted into the inside. At this time, the edge of the first overlapping portion 30A is inserted between the two vertical portions 74 of the first connecting portion 71, and the first connecting portion 71 is slid along the first overlapping portion 30A. The end portion side of the first overlapping portion 30 </ b> A is accommodated in a space (within the C shape) constituted by both the 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 moved to the end portion side of the second overlapping portion 30B. The part 72 is positioned. Subsequently, both ends of the C-shape of the second connecting portion 72, that is, both vertical portions 74 are closed, and the second overlapping portion 30B is placed in the C-shape of the second connecting portion 72 as shown in FIG. Insert and house the end side. Thus, the corner portion C ₁ is connected by a connecting member 7.

  In such an attached state, the first connecting portion 71 and the second connecting portion 72 are fitted into 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 is opposed to the upper joint portion 33 of the inner joint portion 30, both vertical portions 74 are opposed to the bent portions 32 b of the inner joint portion 30, and both horizontal portions 75 are 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 102 </ b> A is set so as to contact the vertical portion 74 of the connector 7. That is, the inner corner duct 103 </ b> A is prevented from moving in the axial direction by the holding projection 22 coming into contact with the coupling body 7.

  Thus, according to this embodiment, the corner C formed by the inner corner duct 103A and the inner corner duct 103B is coupled by the coupling body 7 in a state where the inner corner duct 103A and the inner corner duct 103B are connected. The connection and shape between the inner corner duct 103A and the inner corner duct 103B can be maintained firmly.

  At this time, for example, the end side of the first overlapping portion 30A of the inner corner duct 103A and the inner corner duct 103B is fitted into the C-shape of the first connecting portion 71 of the connecting body 7 and the connecting body 7 is slid. Then, the corners C can be easily and properly connected by simply closing both the vertical parts 74 of the second connecting part 72 and inserting the end part side of the second overlapping part 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 that extend substantially perpendicularly to the outside with respect to the plate surface of the outer wall portion 2 are provided at both ends of each outer wall portion 2. In that both inner ends of each inner wall portion 3 are provided with inner joint portions 30 that extend substantially perpendicular to the outer surface of the inner wall portion 3 and are substantially flush with the outer joint portion 21. The configuration is different from that of the first embodiment, and the same components as those of the first embodiment are denoted by the same reference numerals and the description thereof is omitted.

  As shown in FIG. 18, the outer joint portion 21 is a first portion in which the end portion of the outer wall portion 2 is bent substantially perpendicularly outward (vertical 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 a second outer wall vertical portion 212 that protrudes outside the first outer wall vertical portion 211 (on the side opposite to the outer wall 2 in the axial direction) on the free end side of the first outer wall vertical portion 211. And have. That is, the first outer wall vertical portion 211 and the second outer wall vertical portion 212 both 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 stepped portion 211a between the two.

  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 determined in a state where the inner wall vertical portions 301 and 302 are accommodated in the step portion 211a, as will be described later. 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 stepped portion 211a, that is, the first outer wall vertical portion 211 is equal to the first inner wall vertical portion 301 and the second inner wall vertical portion in a state where the inner wall vertical portions 301 and 302 are accommodated in the stepped portion 211a. A large gap is not generated between the bent portion 301a of 302 and the corner portion of the stepped portion 211a. Specifically, the height T2, that is, the height of the second inner wall vertical portion 302 described later is set slightly smaller than the height of the second outer wall vertical portion 212, and the bent portion 301a is formed 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 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 the outer wall portion. And a first piece stopper 214 that is bent substantially vertically inward with respect to the second plate surface. Further, a convex second piece stopper 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 thickness direction, and the first piece stop portion 214 is bent toward the corner piece 6 side. Thus, the corner piece 6 is accommodated and attached in the piece accommodating 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 substantially perpendicular to the plate surface outward (perpendicular to the axial direction and on the outer wall portion 2 side), The second inner wall vertical portion 302 bent to the inner wall portion 3 side so as to overlap with 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 into a curved shape. That is, the inner wall vertical portions 301 and 302 overlap and extend substantially perpendicular to the inner wall portion 3, and the inner wall horizontal portion 303 extends substantially parallel to the inner wall portion 3 from the second inner wall vertical portion 302. Here, the height T1 of the inner wall horizontal part 303 from the plate surface of the inner wall part 3 is such that the inner wall horizontal part 303 is in contact with the inner surface of the outer wall part 2 and the outer wall part 2 and the inner wall part 3 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 in a state where the second inner wall vertical portion 302 faces the first outer wall vertical portion 211. Thus, the inner wall horizontal portion 303 contacts the outer wall portion 2 and functions as a thickness holding portion. That is, the overlapping portion of the inner wall vertical portions 301 and 302 is accommodated in the stepped portion 211a of the outer joint portion 21, the first inner wall vertical portion 301 is 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 an axial direction holding portion, and an inner angle with respect to the axial direction. The duct 103A has stopped moving.

  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 bent inward substantially perpendicular to the plate surface of the inner wall portion 3 is provided. The horizontal part 303 is reinforced. Similarly, a convex convex reinforcing portion 305 protruding toward the inner wall horizontal portion 303 is provided at the position of the inner wall portion 3 facing the inner wall horizontal portion 303, whereby the inner wall portion 3 and the inner joint portion are provided. 30 is reinforced.

  Further, as shown in FIG. 19, an airtight belt-like packing 5 is disposed so as to straddle the second outer wall vertical portion 212 and the first inner wall vertical portion 301 around the bent portion 301 a.

  And in order to connect the dew condensation prevention angle duct 101A and the dew condensation prevention angle duct 101B of such a structure, what is necessary is just as follows. That is, as shown in FIG. 20, the packings 5 of the dew condensation prevention angular ducts 101A and 101B, that is, the outer joint parts 21 and the inner joint parts 30 are combined, and the bolts of the corner pieces 6 of the outer corner ducts 102A and 102B. A bolt is inserted into the hole 6a and a nut is tightened. 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, so that the inner joint portion 30 is sandwiched. They are connected to each other.

  Thus, according to this embodiment, the outer joint portion 21 extending substantially perpendicularly to the outside is provided at the end portion of each outer wall portion 2, and extends substantially perpendicularly to the outside 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 jointed (connected) simultaneously on the same surface. That is, it is possible to jointly process the inner joint portion 30 at the same time only by performing joint processing on the outer joint portion 21 (bolt fastening with the corner piece 6), and time and labor can be reduced. In addition, since the inner joint portion 30 does not protrude from the outer joint portion 21, transportation and handling can be performed more easily and safely.

  Also, the end of the inner wall portion 3 is bent substantially perpendicularly outward, and further bent substantially in parallel to form inner wall vertical portions (axial 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, the first inner wall vertical portion 301 is substantially flush with the second outer wall vertical portion 212 in a state where the second inner wall vertical portion 302 faces the first outer wall vertical portion 211. That is, the first inner wall vertical portion 301 and the second inner wall vertical portion 302 are accommodated in the step portion 211a between the first outer wall vertical portion 211 and the second outer wall vertical portion 212, and the first inner wall vertical portion 302 is accommodated. 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 is also formed by simply performing joint processing on the outer joint portion 21. It becomes possible to perform joint processing firmly.

  Moreover, if 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 is sealed, leakage (air leakage) can be prevented. 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, it is easily and properly sealed together with the second outer wall vertical portion 212 (packing 5 Can be applied). In other words, if the packing 5 is attached around the center of the outer joint portion 21 without worrying about the position, the bent portion 301a, which is a leak location, can be reliably covered with the packing 5 and can be easily and properly sealed. It becomes. On the other hand, when there is a leak portion (bending portion 301a or the like) at the end of the outer joint portion 21, it must be sealed so as to cover this end portion. There may be cases where it is not sealed.

  In addition, since the second inner wall vertical portion 302 abuts on the first outer wall vertical portion 211 and functions as an axial holding portion, the configuration is simplified, and it can be manufactured easily and at low cost, and is stable over a long period of time. Thus, the inner corner duct 103A can be held.

(Embodiment 4)
21 to 24 show this embodiment. In this embodiment, as shown in FIGS. 21 and 22, 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 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 denoted by the same reference numerals and the description thereof is 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 protrudes toward the plate surface side (inner side) of the inner wall portion 3, and a free end side that is inner than the inner wall horizontal portion 303. A first inner wall vertical portion 301 bent substantially perpendicularly outward with respect 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 perpendicular 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 on the free end side. The first inner wall vertical portion 301 is located on the outer side (on the inner joint portion 30 side 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 such that the inner wall horizontal portion 303 is in contact with the inner surface of the outer wall portion 2 and the outer wall portion 2 and the inner wall portion 3 are in contact with each other. A heat insulating layer S having a predetermined thickness T is set between them.

  Then, as shown in FIG. 21, the first inner wall vertical portion 301 is substantially flush with the second outer wall vertical portion 212 in a state where the second inner wall vertical portion 302 faces the first outer wall vertical portion 211. Thus, the inner wall horizontal portion 303 contacts the outer wall portion 2 and functions as a thickness holding portion. That is, the overlapping portion of the inner wall vertical portions 301 and 302 is accommodated in the stepped portion 211a of the outer joint portion 21, the first inner wall vertical portion 301 is 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 an axial direction holding portion, and an inner angle with respect to the axial direction. The duct 103A has stopped moving.

  Further, as shown in FIG. 23, an airtight belt-shaped packing 5 is disposed so as to straddle the second outer wall vertical portion 212 and the first inner wall vertical portion 301.

  And in order to connect the dew condensation prevention angle duct 101A and the dew condensation prevention angle duct 101B of such a structure, what is necessary is just as follows. That is, as shown in FIG. 24, the packings 5 of the dew condensation prevention angular ducts 101A and 101B, that is, the outer joint parts 21 and the inner joint parts 30 are combined, and the bolts of the corner pieces 6 of the outer corner ducts 102A and 102B. A bolt is inserted into the hole 6a and a nut is tightened. 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, so that the inner joint portion 30 is sandwiched. They are connected to each other.

  Thus, according to this embodiment, the same effect as in the third embodiment can be obtained. In addition, 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 formed easily and appropriately.

  Although the embodiment of the present invention has been described above, the specific configuration is not limited to the above embodiment, and even if there is a design change or the like without 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. However, the connected body may be another air conditioner such as a chamber or a pipe joint. There may be.

  In the first and second embodiments, the thickness holding portion (holding protrusion 22) is provided on the outer wall portion 2, but the inner wall portion 3 protrudes toward the outer wall portion 2 and is bent to form the thickness holding portion. The outer wall 2 may be abutted. Further, the thickness holding portion and the axial direction 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 periphery of the inner corner duct 103A. In the thickness holding member 8, connecting portions 82 are provided at both ends of the belt-like body 81, and clogging tooth portions 83 extending substantially perpendicular to the belt-like body 81 are provided between the connecting portions 82. Then, the four thickness holding members 8 are connected by the connecting portions 82 so as to wrap around the outer periphery of the inner corner duct 103A, and a predetermined portion is formed between the outer corner duct 102A and the inner corner duct 103A by the clog tooth portion 83. The heat insulating layer S having a thickness T is ensured.

  Furthermore, the shapes of the outer joint portion 21 and the inner joint portion 30 in the third embodiment are not limited to those described 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 contacts the outer wall portion 2 and functions as a thickness holding portion. 303 may be provided.

101A Condensation prevention corner duct 101B Condensation prevention corner duct (connected body)
102A outer corner duct 103A inner corner duct 2 outer wall portion 21 outer joint portion 22 holding projection (thickness holding portion, axial holding portion)
211 First outer wall vertical portion 211a Stepped portion 212 Second outer wall vertical portion 3 Inner wall portion 30 Inner joint portion 30 ₁ First inner joint portion 30 ₂ Second inner joint portion 30A First overlapping portion 30B Second 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 part 302 Second inner wall vertical part (axial holding part)
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 (16)

An outer corner duct in which four plate-like outer wall portions are arranged in a substantially square cylindrical shape;
Four plate-shaped inner wall portions are arranged in a substantially rectangular tube shape, and an inner corner duct disposed in the outer corner duct;
A thickness holding part that holds the inner corner duct in the outer corner duct with a predetermined thickness of a heat insulating layer between the outer corner duct and the inner corner duct;
Comprising
Condensation prevention angle duct characterized by that. An axial holding portion for holding the inner corner duct with respect to the axial direction;
The dew condensation prevention angle duct according to claim 1 characterized by things. The thickness holding portion is configured such that the outer wall portion protrudes and bends toward the inner wall portion side and abuts on the inner wall portion, or the inner wall portion protrudes and bends toward the outer wall portion side. Configured to abut against the outer wall,
The dew condensation prevention angular duct according to any one of claims 1 and 2. An outer joint portion extending substantially perpendicularly to the outside with respect to the plate surface of the outer wall portion is provided at an end portion of each outer wall portion,
An inner joint portion extending substantially parallel to the plate surface of the inner wall portion is provided at an end of each inner wall portion.
The dew condensation prevention angle duct according to any one of claims 1 to 3, wherein the dew condensation prevention angle duct is provided. The inner joint portion has an end portion of the inner wall portion 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 sequentially arranged from the inner wall portion side. Provided, the free end of the upper joint part protrudes from the bent part of the lower joint part and the middle joint part,
The upper joint part of the inner joint part of the inner corner duct is connected to the upper joint part and middle joint part of the inner joint part of the connected body with respect to the connected body having the inner joint part of the same structure as the inner joint part. Or by fitting the upper joint portion of the inner joint portion of the body to be connected between the upper joint portion and the middle joint portion of the inner joint portion of the inner corner duct, Connected to the connected body,
The dew condensation prevention angle duct according to claim 4 characterized by things. The upper joint part of the inner joint part is provided with a locking part and an upper locked part, and the middle joint part is provided with a middle locked part of the inner joint part,
When the upper joint portion of the inner joint portion of the inner corner duct is inserted 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 connected to the connected portion. Lock to the middle locked part of the body, the locking part of the connected body locks to the upper locked part of the inner corner duct,
When the upper joint portion of the inner joint portion of the body to be connected 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 body to be connected is the inner corner duct. Locking to the middle locked portion, the locking portion of the inner corner duct is locked to the upper locked portion of the connected body,
The dew condensation prevention angle duct according to claim 5 characterized by things. 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 part of the inner joint part of the inner corner duct is inserted between the upper joint part and the middle joint part of the inner joint part of the connected body, or the upper joint part of the inner joint part of the connected body is inserted. When fitted between the upper joint portion and the middle joint portion of the inner joint portion of the inner corner duct, the reinforcing rib of the inner corner duct and the reinforcing rib of the connected body overlap,
The dew condensation prevention angle duct according to any one of claims 5 and 6. The axial direction holding portion is configured such that the outer wall portion protrudes toward the inner wall portion and is bent, 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 angular duct according to any one of claims 5 to 7, characterized in that In a state in which the inner corner duct and the connected body are connected, the inner corner duct and a connected body that connects corner portions of the inner joint portion of the connected body are provided.
The dew condensation prevention angular duct according to any one of claims 5 and 8. The connection body has a substantially L-shaped body, a first connection portion having a substantially C-shaped cross section and extending straight, and a cross section having a substantially C-shape and extending substantially perpendicularly from one end of the first connection portion. A second connecting portion whose both ends can be freely opened and closed, and the C-shaped opening of the first connecting portion and the second connecting portion faces the inside of the L-shape,
A first inner joint portion that is one of the inner joint portions of the inner corner duct, and a first inner joint portion that is an inner joint portion of the body to be connected that is 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 and A second inner joint portion that is an adjacent inner joint portion and a second inner joint portion that is an inner joint portion of the body to be connected that is in a fitting relationship with the second inner joint portion overlap each other. The second connecting portion is positioned on the end portion side of the overlapping portion, both ends of the C-shape are closed, and the end portion side of the second overlapping portion is inserted into the C-shape of the second connecting portion. By connecting the corners of the inner joint part,
The dew condensation prevention angle duct according to claim 9 characterized by things. An outer joint portion extending substantially perpendicularly to the outside with respect to the plate surface of the outer wall portion is provided at an end portion of each outer wall portion,
An inner joint portion that extends substantially perpendicular to the outer side with respect to the plate surface of the inner wall portion and is substantially flush with the outer joint portion is provided at the end of each inner wall portion.
The dew condensation prevention angle duct according to any one of claims 1 to 3, wherein the dew condensation prevention angle duct is provided. The inner joint portion includes a first inner wall vertical portion in which an end portion of the inner wall portion is bent substantially perpendicularly outward with respect to the plate surface, and an inner wall horizontal portion bent substantially parallel to the plate surface. And
The first inner wall vertical portion is substantially flush with the outer joint portion, and the inner wall horizontal portion abuts on the outer wall portion and functions as the thickness holding portion.
The dew condensation prevention angle duct according to claim 11 characterized by things. The outer joint portion includes a first outer wall vertical portion in which an end portion of the outer wall portion is bent substantially perpendicularly to the outer side with respect to the plate surface, and a first end on the free end side of the first outer wall vertical portion. A second outer wall vertical portion protruding outward from the outer wall vertical portion of
The inner joint portion is bent so that an end portion of the inner wall portion is bent substantially perpendicularly outward with respect to the plate surface, and a first inner wall vertical portion is overlapped with the first inner wall vertical portion. Two inner wall vertical parts, and an inner wall horizontal part in which the free end side of the second inner wall vertical part is bent substantially parallel to the plate surface of the inner wall part,
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. Abuts against the wall and functions as the thickness holder,
The dew condensation prevention angle duct according to claim 11 characterized by things. The second inner wall vertical portion abuts on the first outer wall vertical portion, thereby functioning as an axial holding portion that holds the inner corner duct with respect to the axial direction.
The dew condensation prevention angle duct according to claim 13 characterized by things. The outer joint portion includes a first outer wall vertical portion in which an end portion of the outer wall portion is bent substantially perpendicularly to the outer side with respect to the plate surface, and a first end on the free end side of the first outer wall vertical portion. A second outer wall vertical portion protruding outward from the outer wall vertical portion of
The inner joint portion includes an inner wall horizontal portion bent so that an end portion of the inner wall portion protrudes toward a plate surface side of the inner wall portion, and a free end side of the inner wall horizontal portion is a plate of the inner wall portion. A first inner wall vertical portion bent substantially perpendicularly outward with respect to the surface, and a second inner wall vertical portion bent so as to overlap the first inner wall vertical 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. Abuts against the wall and functions as the thickness holder,
The dew condensation prevention angle duct according to claim 11 characterized by things. The second inner wall vertical portion abuts on the first outer wall vertical portion, thereby functioning as an axial holding portion that holds the inner corner duct with respect to the axial direction.
The dew condensation prevention angle duct according to claim 15 characterized by things.

Images