JP3219987U - Insulation duct - Google Patents

Abstract

The present invention provides a heat insulation duct having a heat insulating material attached to the inside which can be appropriately connected. A heat insulation duct (1) includes a duct body (2) having a flange (3) at an edge of an opening, and a flexible heat insulation sheet (4) joined to an inner surface of the duct body (2), and an end portion of the heat insulation sheet (4) is provided. The duct body 2 is extended from the opening edge to the flange 3 side. The heat insulation duct 1 has small pieces 5 attached in the vicinity of the four corners of the flange 3. The small piece 5 is a material similar to the heat insulating sheet 4 and is a heat insulating material having a flexible resin foam. The small piece 5 is a right-angled isosceles triangular small piece, and is attached to the flange 3 in such a manner that two equal sides having a right angle with each other among the three sides forming the small piece are in contact with the flange portion 4F. The small piece 5 has a size that does not overlap the position of the screw hole 6. [Selection] Figure 1

Description

  The present invention relates to a heat insulation duct.

  In the heat insulation system, a heat insulation duct that forms an air path is used (see, for example, Patent Documents 1-5).

JP-A-8-178404 JP 2001-180250 A JP-A-2018-96570 JP 2007-212114 A JP 2000-171085 A

  A heat insulating material may be attached to the duct for the purpose of suppressing condensation and noise. Such insulation is usually attached to the outside of the duct. And as a heat insulating material attached to the outer side of a duct, glass wool, asbestos, urethane foam, etc. are mentioned. However, asbestos has not been used in recent years due to concerns about carcinogenicity, and urethane foam has poor workability, so the use of glass wool is the mainstream. For example, the air path of an air conditioning system or a smoke exhaust system is usually formed by installing ducts while connecting the ducts on site. Therefore, when the heat insulating material is attached to the outside of the duct, the heat insulating material is usually installed on the site after the duct is first installed on the site. Since the duct is usually attached to a narrow space such as the back of the ceiling, it is not easy to attach the heat insulating material in the narrow space.

  Therefore, for example, it may be possible to attach a heat insulating material to the duct in advance. However, since the duct is installed while being connected at the site, for example, even when the heat insulating material is attached to the outside of the duct in advance, the heat insulating material is unavoidably attached at the site for the connecting portion. Become. In addition, for example, in the case where a heat insulating material is attached in advance to the inside of the duct, it is difficult for an operator to put a hand inside the connected duct. It is difficult to take measures to prevent the insulation material from dropping off from the connecting portion.

  Then, this application makes it a subject to provide the technique which makes it possible to connect appropriately the heat insulation duct which attached the heat insulating material inside.

  In order to solve the above problems, in the present invention, the end of the flexible heat insulating sheet joined to the inner surface of the duct body is extended from the edge of the opening of the duct body to the flange side.

  More specifically, the present invention is a heat insulation duct, and includes a duct body having a flange at an edge of an opening, and a flexible heat insulation sheet joined to an inner surface of the duct body, and an end portion of the heat insulation sheet is a duct. It extends from the edge of the opening of the main body to the flange side.

  If it is such a heat insulation duct, when the flange of another component is fastened to a flange, it will be in the state where the edge part of a heat insulation sheet is pinched | interposed into flanges. For this reason, the edge part of a heat insulation sheet does not peel off. Therefore, if it is the said heat insulation duct, omission of the heat insulation sheet | seat from the connection part will not generate | occur | produce. Moreover, if it is the said heat insulation duct, since the heat insulation sheet is extended from the edge of the opening of a duct main body to the flange side, the treatment for preventing the heat insulation defect | deletion in a connection part is also unnecessary. Therefore, if it is the said heat insulation duct, the heat insulation duct which attached the heat insulating material inside can be connected appropriately.

  The duct body has an inner surface having a plurality of linear end sides, the opening is formed in a polygon by the end sides of the plurality of inner surfaces, and the flange is a plurality of second sides corresponding to the end sides of the plurality of inner surfaces. 1 part and the 2nd part which connects adjacent 1st parts, the edge part of a heat insulation sheet is bent from the edge to the 1st part side, and the 2nd part, The small piece of the heat insulating material for filling between the edge parts of the heat insulation sheet currently bent at the 1st part side in the both sides of the 2nd part may be joined. With such a heat insulating duct, the airtightness at the connecting portion between the flanges is improved.

  If it is said heat insulation duct, the heat insulation duct which attached the heat insulating material inside can be connected appropriately.

Drawing 1 is a figure showing the heat insulation duct concerning an embodiment. FIG. 2 is a diagram illustrating a state in which the heat insulating ducts are connected to each other. FIG. 3 is a view showing a connecting portion of the heat insulation duct. FIG. 4 is a cross-sectional view of the heat insulation duct when cut along a two-dot chain line indicated by AA in FIG. 3. FIG. 5 is a cross-sectional view of the heat insulation duct when cut along a two-dot chain line indicated by a symbol BB in FIG. 3. FIG. 6 is a cross-sectional view of the heat insulation duct taken along the two-dot chain line indicated by the symbol CC in FIG. FIG. 7 is a cross-sectional view of the heat insulation duct taken along the two-dot chain line indicated by the reference sign DD in FIG.

  Hereinafter, embodiments of the present invention will be described. Embodiment shown below illustrates embodiment of this invention and does not limit the technical scope of this invention to the following form.

  Drawing 1 is a figure showing the heat insulation duct concerning an embodiment. The heat insulation duct 1 is a duct installed in a building, a factory, or the like, and a duct internal space 2N serving as an air path is formed in the duct main body 2 by a metal duct main body 2 in which a sheet metal is formed in a rectangular cylindrical shape. To do. The system in which the heat insulation duct 1 is used is constructed by combining the heat insulation duct 1, a damper, a blower, a heat exchanger, and other various system components. Therefore, the heat insulation duct 1 is provided with a flange 3 at the opening of the duct body 2 for connection with system components constituting the system.

In FIG. 1, only the vicinity of the opening in the longitudinal direction of the heat insulation duct 1 is shown, but the heat insulation duct 1 has an appropriate length. Moreover, although the heat insulation duct 1 of a straight pipe is illustrated in FIG. 1, the heat insulation duct according to the present embodiment may be a curved pipe used for bending an air path, or may have other shapes. An insulating duct may be used. The heat insulation duct 1 may be a very short straight pipe. The heat insulation duct 1 may be a rounded duct or a duct having another shape. Therefore, the opening of the duct body 2 where the flange 3 is provided is not necessarily the end of the duct body 2 in the longitudinal direction.

  The heat insulating duct 1 is a heat insulating duct having a heat insulating material on the inner side, and the heat insulating sheets 4 are bonded to four surfaces forming the inner surface of the duct main body 2. The heat insulating sheet 4 is a heat insulating sheet whose main constituent material is a flexible resin foam. The heat insulating sheet 4 is attached to the inner surface of the duct body 2 and extends from the edge of the inner surface of the duct body 2. The end of the duct body 2 that is a part is bent to the flange 3 side and attached to the flange 3. Therefore, the heat insulating sheet 4 includes an inner surface portion 4N that is bonded to the inner surface of the duct body 2 and a flange portion 4F that is bonded to the flange 3. The heat insulating sheet 4 can be freely selected to have an appropriate thickness in accordance with the required heat insulating properties, and a thickness of 2 mm or more is usually applied. For example, the thickness of the heat insulating sheet 4 is preferably 10 mm or less, preferably 6 mm or less, and more preferably 4 mm or less. This is because if the heat insulating sheet 4 is too thick, the flow passage area in the duct is narrowed and the pressure loss is increased. In addition, the thickness of the heat insulation sheet 4 is not limited to these, For example, if the dimension of the duct main body 2 is designed in consideration of the thickness of the heat insulation sheet 4, the heat insulation sheet 4 having a thickness larger than 10 mm is used. It is also possible to apply.

  The heat insulating sheet 4 has a heat insulating layer of a flexible resin foam, an adhesive layer formed on one surface of the heat insulating layer, and an aluminum foil layer formed on the other surface of the heat insulating layer. doing. Since the aluminum foil itself is susceptible to ductile fracture when subjected to a load, the aluminum foil layer is reinforced with fibers or a thin resin film. And in this embodiment, what was provided from the manufacturer in the state which the layer of the adhesive was covered with the release paper is used as the heat insulation sheet 4. Therefore, in this embodiment, the form which affixes the heat insulation sheet 4 to a sheet metal is taken, and it has become a form which the layer of aluminum foil exposes to the duct internal space 2N. However, the heat insulation sheet 4 may be joined using, for example, welding, adsorption, and other various forms of methods.

  The heat insulation duct 1 has small pieces 5 attached in the vicinity of the four corners of the flange 3. The small piece 5 is a material similar to the heat insulating sheet 4 and is a heat insulating material having a flexible resin foam. The small piece 5 is a right-angled isosceles triangular small piece, and is attached to the flange 3 in such a manner that two equal sides having a right angle with each other among the three sides forming the small piece are in contact with the flange portion 4F. The small piece 5 has a size that does not overlap the position of the screw hole 6. Therefore, the remaining one of the three sides forming the small piece is located closer to the inside of the heat insulation duct 1 than the screw hole 6 provided in the flange 3.

  FIG. 2 is a diagram illustrating a state in which the heat insulating ducts 1 are connected to each other. For example, as shown in FIG. 2, the heat insulation duct 1 can be connected to another heat insulation duct 1. In this case, the heat insulation ducts 1 are connected to each other by fastening the flanges 3 at the ends of the heat insulation ducts 1 with screws such as bolts and nuts.

  By the way, as described above, the flange portion 4F and the small piece 5 of the duct body 2 are attached to the flange 3. Therefore, when the flanges 3 at the end portions of the respective heat insulation ducts 1 are fastened with bolts, the flange portion 4F and the small piece 5 are in the following state.

  FIG. 3 is a view showing a connecting portion of the heat insulation duct 1. When the flanges 3 at the ends of the respective heat insulation ducts 1 are fastened with bolts 7 and nuts 8 so that the heat insulation ducts 1 are connected to each other, as shown in FIG. They are in close contact with each other. Hereinafter, the heat insulating structure of the heat insulating duct 1 formed by the heat insulating sheet 4 in FIG. 3 is indicated by a two-dot chain line indicated by reference AA, a two-dot chain line indicated by reference BB, and two indicated by reference C-C. This will be described with reference to a cross-sectional view taken along the dotted line.

FIG. 4 is a cross-sectional view of the heat insulation duct 1 taken along the two-dot chain line indicated by the reference AA in FIG. As shown in FIG. 4, the duct internal space 2 </ b> N through which air flows is insulated by the heat insulating sheet 4 on any of the four surfaces constituting the inner surface of the duct internal space 2 </ b> N. Therefore, the air passing through the duct internal space 2N is less susceptible to thermal influence from the air around the heat insulation duct 1 than the duct in which the heat insulation sheet 4 is omitted. Therefore, for example, when the heat insulation duct 1 is used in an air conditioning system, when the air conditioning system is operated in a heating state, the warm air passing through the duct internal space 2N is converted into a duct in which the heat insulation sheet 4 is omitted. In comparison, a temperature drop is less likely to occur due to thermal effects from the air around the heat insulation duct 1. Further, for example, when the air conditioning system is operated in a cooling state, the cold air passing through the duct internal space 2N is received from the air around the heat insulation duct 1 as compared with the duct in which the heat insulation sheet 4 is omitted. Temperature rise is less likely to occur due to thermal effects. Therefore, if it is an air-conditioning system using the heat insulation duct 1, the space of air-conditioning object can be air-conditioned appropriately, and the thermal loss which arises in the process in which air passes the heat insulation duct 1 can also be suppressed.

  Further, in the case of the heat insulation duct 1, since the space between the duct internal space 2N and the periphery of the heat insulation duct 1 is insulated by the heat insulation sheet 4, for example, air having a temperature lower than that around the heat insulation duct 1 is passed through the duct internal space 2N. Even if it passes, the outer surface of the duct body 2 is less likely to cause a temperature difference with the air around the heat insulation duct 1 compared to the duct in which the heat insulation sheet 4 is omitted. Therefore, although it depends on the heat insulation performance of the heat insulating sheet 4, if it is the heat insulating duct 1, the amount of condensation generated on the outer surface of the duct body 2 is significantly suppressed as compared with a duct in which the heat insulating sheet 4 is omitted. Is possible. In particular, the heat insulating duct 1 has an inner heat insulating structure in which a heat insulating sheet 4 is joined to the inside of the duct body 2, and therefore, compared to a duct having an outer heat insulating structure in which a fiber heat insulating material such as glass wool is attached around the duct. Various problems resulting from the occurrence of condensation can be solved. In other words, condensation occurs when the moisture-containing gas is cooled and the moisture condenses. Therefore, in order to suppress the amount of condensation, basically, from the high temperature side in the heat insulating part. It is important to block the air flow toward the low temperature side. In this regard, in the case of a duct in which a moisture-permeable fiber-based heat insulating material such as glass wool is attached around the duct, an air flow inevitably occurs from the high temperature side to the low temperature side inside the fiber heat insulating material. Even if the fiber-based heat insulating material is covered with a protective cover made of aluminum or the like, moisture is introduced into the fiber-based heat insulating material by the air flowing through the gap of the protective cover, and the fiber-based heat insulating material is condensed. Since the thermal insulation performance of fiber-based insulation is significantly reduced when condensation occurs, once condensation forms inside the fiber-based insulation, natural elimination of condensation is not possible unless the temperature of the air passing through the duct rises. Is possible. In this respect, the heat insulating duct 1 of the present embodiment has an inner heat insulating structure in which the heat insulating sheet 4 is joined to the inside of the duct main body 2, and the air between the air around the duct main body 2 and the heat insulating sheet 4 is ventilated. Since it is blocked by the duct main body 2 that is neither permeable nor moisture permeable, no condensation occurs in the heat insulating sheet 4 even when cool air passes through the duct internal space 2N. In addition, when warm air passes through the duct internal space 2N, there is a possibility that condensation may occur on the surface of the heat insulating sheet 4 when the air around the duct body 2 is extremely low temperature. It is rare that the surroundings of the heat insulation duct 1 installed inside become extremely low temperature, and since the warm air passing through the duct internal space 2N is basically low in humidity, condensation may occur on the surface of the heat insulation sheet 4 The sex is actually low.

  Therefore, it can be said that it is extremely reasonable to make the duct of the air conditioning system have an inner heat insulating structure. Therefore, it can be said that the usefulness of the duct is extremely high if it is possible to realize a duct that does not cause a heat insulation defect in a connection part between the ducts and does not cause the insulation material to drop off from the connection part. In this respect, the heat insulation duct 1 of the present embodiment has the following structure in the connection portion, so that the occurrence of heat insulation defects and the dropout of the heat insulating material are prevented.

FIG. 5 is a cross-sectional view of the heat insulation duct 1 when cut along a two-dot chain line indicated by a symbol BB in FIG. 3. Moreover, FIG. 6 is sectional drawing at the time of cut | disconnecting the heat insulation duct 1 along the dashed-two dotted line shown by code | symbol CC in FIG. As shown in FIG. 5, the flange portion 4F and the small piece 5 of the heat insulating sheet 4 are arranged over the entire circumference of the connecting portion between the heat insulating ducts 1 connected by the flanges 3 fastened to each other. And the flange part 4F and the small piece 5 provided in any one of the two heat insulation ducts 1 connected mutually will be in the state closely_contact | adhered to the flange part 4F and the small piece 5 provided in any other. Therefore, the flange portion 4F and the small piece 5 function as a gasket that ensures the airtightness of the connecting portion between the heat insulating ducts 1 connected by the flange 3. Moreover, since the flange part 4F and the small piece 5 are formed with the heat insulating resin foam, it functions also as a heat insulating material which ensures the heat insulation of the said connection part.

  In the heat insulation duct 1, the flange portion 4 </ b> F located at the end of the heat insulation sheet 4 extends from the edge of the opening of the duct body 2 toward the flange 3, so that the flange 3 of the other heat insulation duct 1 is attached to the flange 3. When fastened, the flange portion 4F is sandwiched between the flanges 3 as shown in FIG. For this reason, even if the heat insulating sheet 4 can be peeled from the duct main body 2 due to deterioration of the adhesive layer that joins the heat insulating sheet 4 to the inner surface of the duct main body 2, the flange located at the end of the heat insulating sheet 4. Since the portion 4F is sandwiched between the flanges 3, the end portion of the heat insulating sheet 4 is not peeled off. Therefore, if it is the heat insulation duct 1 of this embodiment, omission of the heat insulation sheet 4 from a connection part will not generate | occur | produce. Further, when the cool air flows through the duct internal space 2N, the cool air does not directly touch the metal duct main body 2 or the flange 3. Therefore, the metal which comprises the duct main body 2 and the flange 3 becomes a temperature close | similar to external temperature. Therefore, if it is the heat insulation duct 1 of this embodiment, compared with what the metal which comprises the duct main body 2 and the flange 3 touches the cold air which flows through the duct internal space 2N directly, it will become difficult to condense the surface.

  In particular, in the heat insulation duct 1 of this embodiment, the surface of the heat insulation layer of the flexible resin foam is covered with a layer of aluminum foil reinforced with fibers or a thin resin film, and the layer of the aluminum foil is inside the duct. Since it is attached to the inner surface of the duct body 2 in a state facing the space 2N, the aluminum foil layer is sandwiched between the flanges 3 in a continuous state from the inner surface portion 4N to the flange portion 4F. ing. Therefore, if it is the heat insulation duct 1 of this embodiment, even if it is a case where the resin foam of the heat insulation sheet 4 deteriorates, the drop-off of the heat insulation sheet 4 from the connection part will not generate | occur | produce. In addition, the presence of the aluminum foil layer can suppress the fouling and deterioration of the resin foam.

  By the way, the flange portion 4F of the heat insulating sheet 4 is extended from the edge of the opening of the duct body 2 to the flange 3 side and is attached to the flange 3 in a state of being bent at the edge of the opening. In the corner portion of 3, the flange portions 4F are inevitably vacated. Therefore, in the heat insulation duct 1 of the present embodiment, small pieces 5 are provided to fill the gaps between the flange portions 4F. Hereinafter, the small piece 5 will be described.

  FIG. 7 is a cross-sectional view of the heat insulation duct 1 taken along the two-dot chain line indicated by the reference sign DD in FIG. FIG. 7 shows the cross-sectional view (DD cross-sectional view) on the lower side of the sheet of FIG. 7 and an enlarged view of the corresponding portion of FIG. 5 so that the correspondence between the respective portions in the cross-sectional view can be easily understood (B A partially enlarged view of the -B cross section) is shown on the upper side of the paper surface of FIG.

As can be seen from a partially enlarged view of the B-B cross section shown on the upper side of FIG. 7, the small piece 5 has one flange portion 4F and the other flange portion 4F in the portion between the adjacent flange portions 4F. It is joined to the flange 3 so as to be in close contact with any of the above. And as above-mentioned, the small piece 5 becomes a magnitude | size which does not overlap with the position of the screw hole 6, The edge | side equivalent to a long side is provided in the flange 3 in the small piece 5 which exhibits the external shape of a right-angled isosceles triangle. It is located closer to the inside of the heat insulation duct 1 than the screw hole 6 that is present. For this reason, when the flanges 3 are fastened together by the bolt 7 and the nut 8, the following force is not generated between the flange portion 4 </ b> F and the small piece 5.

  That is, when the flanges 3 are fastened together by the bolts 7 and the nuts 8, a portion surrounded by a broken line in the DD sectional view shown in the lower side of FIG. 7, that is, a portion where the flange portion 4 F and the small piece 5 are in contact with each other. Causes a force to press each other. This force acts by the force of crushing the flange portion 4F and the small piece 5 sandwiched between the two flanges 3 to be fastened together by fastening the flanges 3 with the bolts 7 and the nuts 8. As a result, the flange portion 4F And the heat-insulating layer of the flexible resin foam body of the small piece 5 is deformed so as to spread laterally with respect to the force. Further, the small piece 5 has a size that does not overlap with the position of the screw hole 6, and the side corresponding to the long side of the small piece 5 having an outer shape of a right isosceles triangle is larger than the screw hole 6 provided in the flange 3. Is located closer to the inside of the heat insulation duct 1, the slight distortion of the flange 3 caused by the fastening force of the bolt 7 and the nut 8 causes a force acting in the direction of pressing the small piece 5 toward the flange portion 4F. .

  In the corner portion of the flange 3, the force as described above acts between the flange portion 4 </ b> F and the small piece 5 in this way, so that airtightness between the flange portions 4 </ b> F is ensured. As a result, airtightness is ensured over the entire circumference of the flange 3 at the connection portion between the heat insulation ducts 1.

1 .. Insulation duct: 2 .... Duct body: 2N ... Duct interior space: 3 .... Flange: 4 .... Insulation sheet: 4N ... Internal surface part: 4F ... Flange part: 4E ... Edge: 5 .... Small pieces: 6. Screw holes: 7. Bolts: 8. Nuts

Claims (2)

A duct body having a flange at the edge of the opening;
A flexible heat insulating sheet joined to the inner surface of the duct body,
The end of the heat insulating sheet extends from the edge of the opening of the duct body to the flange side,
Insulated duct. The duct body has an inner surface having a plurality of straight edges,
The opening is formed in a polygon by the edges of the plurality of inner surfaces,
The flange has a plurality of first portions corresponding to the edges of the plurality of inner surfaces, and a second portion connecting the adjacent first portions,
The end portion of the heat insulating sheet is bent from the end side to the first portion side,
A small piece of heat insulating material is bonded to the second part to fill the gap between the ends of the heat insulating sheet that is bent to the first part side on both sides of the second part.
The heat insulation duct according to claim 1.

Images