JP2021067450A - Dew condensation prevention round duct connection structure - Google Patents

Abstract

To provide a dew condensation prevention round duct that can prevent dew condensation without a thermal insulation material wound around the duct.SOLUTION: A dew condensation prevention round duct connection structure includes: an outside round duct 4 having a substantially circular cross section; an inside round duct 3 having a substantially circular cross section and disposed inside the outside round duct 4; and thickness holding means for holding the inside round duct 3 inside the outside round duct 4 by making a heat insulation layer becoming a predetermined thickness between the outside round duct 4 and the inside round duct 3.SELECTED DRAWING: Figure 1

Description

The present invention relates to a dew condensation prevention round duct connection structure for connecting a dew condensation prevention round duct having a substantially circular cross section and capable of preventing dew condensation.

In ducts for air conditioning and the like, the ducts may be heat-insulated at the installation site in order to prevent dew condensation (see, for example, Patent Document 1). That is, after the duct is attached to a predetermined installation location such as in the ceiling, a sheet-shaped (strip-shaped) heat insulating material made of glass wool is wrapped around the outer circumference of the duct. In such heat insulation treatment, a contractor different from the contractor who installs the duct usually carries the heat insulating material to the site separately from the duct and performs the arrangement work.

Japanese Unexamined Patent Publication No. 2008-089288

However, since such heat insulation treatment is performed in a state where the duct is arranged in the ceiling or the like, it is difficult to construct and not only requires a great deal of labor and time for construction, but also waste heat insulating material at the installation site. Will occur, and disposal will be required. Especially in recent years, construction / construction schedules and construction / construction costs including disposal costs have been strictly restricted and managed at construction sites, etc., and ducts are quickly insulated and waste materials are discharged to the installation site. There is an urgent need to prevent it from occurring.

Moreover, in the past, since the contractor who installs the duct and the contractor who performs the heat insulation treatment are different, it is not only difficult and complicated to adjust the construction schedule, but also a storage place for the heat insulating material must be secured separately from the duct. It had to be carried in and storage adjustment was complicated. In addition, more personnel are required, which not only increases the cost but also may impair safety.

On the other hand, when connecting round ducts, it has been necessary to fix them in multiple places with screws or rivets, which causes work omissions and variations in work quality of screws and rivets, and also requires tools, so work safety is low. It was. As a result, it has been difficult to properly, easily, and safely connect the round ducts to each other.

Therefore, an object of the present invention is to provide a dew condensation prevention round duct connection structure capable of appropriately and easily connecting dew condensation prevention round ducts to each other.

The invention according to claim 1 comprises a first outer round duct which is a spiral duct and a first inner round duct which is a spiral duct and is arranged in the first outer round duct. One end of a first dew condensation prevention round duct having a heat insulating layer having a predetermined thickness between the first outer round duct and the first inner round duct, a second outer round duct which is a spiral duct, and a spiral. A second inner round duct which is a duct and is arranged in the second outer round duct is provided, and heat insulation of a predetermined thickness is provided between the second outer round duct and the second inner round duct. A dew condensation prevention round duct connection structure for connecting one end of a second dew condensation prevention round duct having a layer, and a guide portion projecting inward to one end of the first inner round duct is the second. It is formed on a locus equivalent to the spiral locus of the haze joint of the inner round duct, and one end of the second inner round duct is inserted into one end of the first inner round duct. The feature is that the first inner round duct and the second inner round duct are connected by screwing the guide portion of the inner round duct and the haze joint portion of the second inner round duct. And.

The invention according to claim 2 includes a regulating portion that regulates the amount of insertion of the second inner round duct into the first inner round duct in the dew condensation prevention round duct connection structure according to claim 1. It is characterized by that.

In the invention according to claim 3, in the dew condensation prevention round duct connection structure according to claim 1 or 2, the outer diameters of the first inner round duct and the second inner round duct are set to be the same diameter. One end of the second inner round duct is reduced in diameter and inserted into one end of the first inner round duct.

In the invention according to claim 4, in the dew condensation prevention round duct connection structure according to claims 1 to 3, the outer diameters of the first outer round duct and the second outer round duct are set to be the same diameter. The first outer round duct and the second outer round duct are connected to each other via a cylindrical round duct joint.

The invention according to claim 5 is the dew condensation prevention round duct connection structure according to claim 4, wherein the round duct joint has a first joint fitting portion having an inverted concave cross section protruding outward to one end side. The second joint fitting portion, which is formed with a locus equivalent to the spiral locus of the haze joint portion of the first outer round duct and protrudes outward to the other end side and has an inverted concave cross section, is the second joint fitting portion. It is formed with a locus equivalent to the spiral locus of the haze joint of the outer round duct, and one end of the first outer round duct is inserted into one end side of the round duct joint, and the inside of the first joint fitting portion. The first outer round duct is connected to the round duct joint by fitting the haze joint portion of the first outer round duct to the second end side of the round duct joint. One end of the outer round duct is inserted, and the haze joint portion of the second outer round duct is fitted into the second joint fitting portion, so that the second outer round duct becomes the round duct. It is characterized in that it is connected to a duct.

The invention according to claim 6 is characterized in that, in the dew condensation prevention round duct connection structure according to claim 5, the round duct joint is provided with a grip portion protruding from an outer peripheral surface.

According to the first aspect of the invention, the guide portion of the first inner round duct and the goby joint portion of the second inner round duct are screwed together to form a first inner round duct and a second inner side. A round duct is connected. That is, since they are connected by screwing like a screw, the two inner round ducts are firmly connected and do not easily come off, and moreover, the guide portion and the goby joint portion need only be screwed together. For this reason, it is not necessary to fix at a plurality of places with screws or rivets as in the conventional case, and not only is there no omission of work of screws or rivets or variation in work quality, but also work safety is improved because tools and the like are not required. As a result, the dew condensation prevention round ducts can be properly, easily, and safely connected to each other.

According to the invention of claim 2, since the insertion amount of the second inner round duct into the first inner round duct is regulated by the regulating portion, the insertion amount of the second inner round duct is made appropriate. , Inner round ducts, that is, dew condensation prevention round ducts can be connected more appropriately.

According to the third aspect of the present invention, since the outer diameters of the first inner round duct and the second inner round duct are set to the same diameter, one end of the second inner round duct is set to the first one. Two inner round ducts are connected as round ducts having the same diameter over the entire length while being inserted into one end of the inner round duct. Therefore, a uniform duct space (intake / exhaust space) is formed over the entire length, and a good intake / exhaust flow path can be secured. Moreover, since one end of the second inner round duct is reduced in diameter and inserted into one end of the first inner round duct, a member for inserting and connecting to the first inner round duct is separately provided. It is not necessary to provide it in the inner round duct of No. 2, and the configuration can be simplified.

According to the fourth aspect of the present invention, since the first outer round duct and the second outer round duct are connected via the round duct joint, the plate material, the sheet material, or the like is connected to the first outer round. Compared with the case where the duct and the second outer round duct are wound and connected, the connection can be made properly and easily, and the appearance is improved.

According to the invention of claim 5, the goby joint portion of the first outer round duct is fitted in the first joint fitting portion of the round duct joint, and the second joint fitting of the round duct joint is fitted. The two outer round ducts are connected by fitting the haze joint of the second outer round duct into the portion. That is, since the spiral haze joint is fitted in the spiral joint fitting and is connected by a screw-like screw, the two outer round ducts are firmly connected and easily come off. Moreover, it is only necessary to fit the goby joint portion inside the joint fitting portion. For this reason, it is not necessary to fix at a plurality of places with screws or rivets as in the conventional case, and not only is there no omission of work of screws or rivets or variation in work quality, but also work safety is improved because tools and the like are not required. As a result, the outer round ducts, that is, the dew condensation prevention round ducts can be properly and easily connected to each other.

According to the sixth aspect of the present invention, since the round duct joint is provided with the grip portion, by holding the grip portion and rotating the round duct joint, it is possible to easily and appropriately insert the grip portion into the joint fitting portion. It is possible to fit the joints.

It is a front view which shows the state before the connection of the two dew condensation prevention round ducts which concerns on embodiment of this invention. It is a front view which shows the 1st inner round duct of the 1st dew condensation prevention round duct which concerns on embodiment of this invention. It is a front view which shows the 1st outer round duct of the 1st dew condensation prevention round duct which concerns on embodiment of this invention. It is a side view which shows the thickness holding band attached to the 1st inner round duct of FIG. 2, (a) shows the state in which the heat insulating layer forming part was standing, and (b) is the state where the heat insulating layer forming part laid down. Indicates the state. It is a front view which shows the 2nd inner round duct of the 2nd dew condensation prevention round duct which concerns on embodiment of this invention. FIG. 5 is a cross-sectional view taken along the line AA of FIG. It is a front view which shows the 2nd outer round duct of the 2nd dew condensation prevention round duct which concerns on embodiment of this invention. It is a front view which shows the joint for a round duct which concerns on embodiment of this invention. It is a front view which shows the state before connecting the 1st inner round duct of FIG. 2 and the 2nd inner round duct of FIG. It is a front view which shows the state which connected the 1st inner round duct of FIG. 2 and the 2nd inner round duct of FIG. FIG. 10 is a cross-sectional view taken along the line BB of FIG. It is a front view which shows the state which the 1st inner round duct of a 1st dew condensation prevention round duct and the 2nd inner round duct of a 2nd dew condensation prevention round duct are connected. It is a front view which shows the state which connected the 1st outer round duct and the 2nd outer round duct by the round duct joint of FIG. 8 from the state of FIG. FIG. 3 is a sectional view taken along the line CC of FIG.

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

1 to 14 show an embodiment of the present invention, and FIG. 1 is a front view showing a state before connection of the two dew condensation prevention round ducts 1 and 2 according to the embodiment. The dew condensation prevention round ducts 1 and 2 are round ducts having a substantially circular cross section and capable of preventing dew condensation, and outer round ducts 4 and 6 having a substantially circular cross section and outer round ducts 4 and 6 having a substantially circular cross section, respectively. The heat insulating layer between the inner round ducts 3 and 5 arranged inside and the outer round ducts 4 and 6 and the inner round ducts 3 and 5 has a predetermined thickness, and the inner round ducts 3 and 5 are the outer round ducts 4 and 5. A thickness holding band (thickness holding means) 8 for holding in 6 is provided.

Specifically, in this embodiment, the first dew condensation prevention round duct 1 is arranged in the first outer round duct 4 which is a spiral duct and the first outer round duct 4 which is a spiral duct. It is a round duct including a first inner round duct 3 and having a heat insulating layer having a predetermined thickness between the first outer round duct 4 and the first inner round duct 3. Similarly, the second dew condensation prevention round duct 2 includes a second outer round duct 6 which is a spiral duct and a second inner round duct 5 which is a spiral duct and is arranged in the second outer round duct 6. A round duct having a heat insulating layer having a predetermined thickness between the second outer round duct 6 and the second inner round duct 5.

Here, the spiral duct is a round duct in which a strip-shaped member is spirally wound and adjacent side edge portions are spirally joined to form a circular tubular shape, and the goby joint portion spirally protrudes from the surface. For example, as shown in FIG. 11, in the first inner round duct 3, one side edge portion of the strip-shaped plate material is bent to form a double goby 311 and the other side edge portion is bent to form a single goby 312. It is formed. This strip-shaped plate material is spirally wound, and the double goby 311 and the single goby 312 adjacent to each other are engaged and connected to form a circular tubular material. Then, the goby joint portion 31, which is the joint portion between the double goby 311 and the single goby 312, protrudes from the surface of the first inner round duct 3 and has a spiral locus. The same applies to the other spiral ducts 4 to 6, and in the case of the second inner round duct 5 in FIG. 11, the goby joint 51, which is the joint between the double goby 511 and the single goby 512, is the second inner round duct. It has a spiral locus protruding from the surface of 5.

In this embodiment, the outer diameter and inner diameter of the first inner round duct 3 and the second inner round duct 5 are formed to have the same diameter except for one end portion 5a of the second inner round duct 5, which will be described later. Moreover, the trajectories of the two goby joints 31 and 51 are the same. That is, the two inner round ducts 3 and 5 are basically the same duct, and are formed by winding the same strip-shaped plate material with the same diameter. Here, the inner diameters of the inner round ducts 3 and 5 are set so that the required amount of air can be taken in and out.

Similarly, the outer diameter and the inner diameter of the first outer round duct 4 and the second outer round duct 6 are formed to have the same diameter, and the trajectories of the two goby joints 41 and 61 are the same. That is, the two outer round ducts 4 and 6 are basically the same duct, and are formed by winding the same strip-shaped plate material with the same diameter.

Further, as shown in FIG. 2, a guide portion 32 is formed on a spiral locus at one end portion 3a of the first inner round duct 3. The guide portion 32 has a concave shape protruding inward of the first inner round duct 3, and is formed on a locus equivalent to the spiral locus of the goby joint 51 of the second inner round duct 5. It is designed to be screwed with 51. That is, in this embodiment, since the trajectories of the two goby joints 31 and 51 are the same, the guide portion 32 is formed on the locus along the goby joint 31. Specifically, as shown in FIG. 11, it is formed adjacent to the root side (anti-bending side) of the goby joint portion 31.

Here, in this embodiment, the guide portions 32 are interspersed on the spiral locus, but they may be formed linearly long. The range and length of one end 3a on which such a guide portion 32 is formed is the length of one end 5a of the second inner round duct 5 (the length inserted into the first inner round duct 3). It is set a little longer than. On the other hand, the guide portion 32 may be formed over the entire length of the first inner round duct 3 so that the guide portions 32 appear at both ends no matter where the first inner round duct 3 is cut.

The inner diameter of the first outer round duct 4 shown in FIG. 3 is such that the first outer round duct 4 and the first outer round duct 4 are concentrically arranged in the first outer round duct 4. A heat insulating layer (air layer) having a predetermined thickness is provided between the inner round ducts 3 of the above. Here, the heat insulating layer is uniformly provided on the outside of the first inner round duct 3, and the predetermined thickness of the heat insulating layer is a heat insulating layer even when the temperature difference between the inside and outside of the first dew condensation prevention round duct 1 is large. The thickness is set so that dew condensation does not occur due to the heat insulating effect of.

On the other hand, as shown in FIG. 2, a thickness holding band 8 is attached to the outer peripheral surface of the first inner round duct 3. The thickness holding band 8 is a band-shaped band attached along the circumferential direction of the first inner round duct 3. Specifically, as shown in FIG. 4A, the band-shaped band member 81 is bent in a circular shape, and a first heat insulating layer forming portion 81a bent so as to project outward is formed at both ends thereof. Has been done.

Further, the band member 81 is formed with three second heat insulating layer forming portions 82 projecting outward from the band member 81, and the second heat insulating layer forming portion 82 and the first heat insulating layer forming portion 81a are formed. It is arranged at 90 ° intervals from the center of the band member 81. As shown in FIG. 4B, the second heat insulating layer forming portion 82 is formed by raising a U-shaped notch 81b formed in the band member 81.

The amount of protrusion of the heat insulating layer forming portions 81a and 82 from the first inner round duct 3 is set so that the heat insulating layer having a predetermined thickness as described above is provided. Then, the band member 81 is wound around the outer peripheral surface of the first inner round duct 3 and the heat insulating layer forming portions 81a are screwed together to maintain the ring-shaped thickness on the outer peripheral surface of the first inner round duct 3. Band 8 is attached.

In such a mounting state, the plurality of convex heat insulating layer forming portions 81a and 82 project toward the first outer round duct 4, and the free ends of the heat insulating layer forming portions 81a and 82 are the first outer round duct 4. Contact the inner surface. As a result, the first inner round duct 3 is concentrically arranged in the first outer round duct 4.

By arranging the first inner round duct 3 concentrically in the first outer round duct 4 in this way, the first outer round duct 4 and the first inner round duct 3 are concentrically arranged by the thickness holding band 8. A heat insulating layer having a predetermined thickness is provided between the two, and the first inner round duct 3 is securely held in the first outer round duct 4. The first inner round so that such a thickness holding band 8 can form a heat insulating layer appropriately and stably according to the length of the first inner round duct 3 and the first outer round duct 4. A plurality of ducts 3 are attached along the longitudinal direction.

As shown in FIG. 5, the one end portion 5a of the second inner round duct 5 is reduced in diameter so that it can be inserted and mounted in the one end portion 3a of the first inner round duct 3. That is, as shown in FIG. 6, the one end portion 3a is narrowed inward and has a small diameter by forming a plurality of concave portions 52 extending inward and extending in the axial direction. The outer diameter of the one end portion 5a is set to be slightly smaller than the inner diameter of the first inner round duct 3, so that the goby joint portion 51 of the one end portion 5a can be screwed with the guide portion 32 of the first inner round duct 3. It has become. Further, the goby joint 51 at the one end 5a has a trajectory substantially the same as that of the goby joint 51 other than the one end 5a, and is screwed with the guide 32.

In this way, one end 5a is set to an outer diameter that can be inserted and connected to the first inner round duct 3, and the outer diameter other than the one end 5a and the outer diameter of the first inner round duct 3 are the same. It is set. Further, a stepped portion 53, which is a sakai between a portion other than the one end portion 5a (main pipe portion) and the one end portion 5a, constitutes a regulating portion. That is, the one end portion 5a is inserted into the first inner round duct 3, and the edge of the one end portion 3a of the first inner round duct 3 hits the step portion 53, so that the first inner round duct 3 is connected to the first one. The insertion amount of the inner round duct 5 of 2 is regulated. With respect to the length of such one end portion 5a, by inserting the one end portion 5a into the first inner round duct 3, the two inner round ducts 3 and 5 and the dew condensation prevention round ducts 1 and 2 are stably connected. Is set to.

The inner diameter of the second outer round duct 6 shown in FIG. 7 is such that the second outer round duct 6 and the second outer round duct 6 are concentrically arranged in the second outer round duct 6. A heat insulating layer having a predetermined thickness is provided between the inner round ducts 5 of the above. Here, the heat insulating layer is an air layer similar to the above heat insulating layer formed between the first outer round duct 4 and the first inner round duct 3.

On the other hand, as shown in FIG. 5, a thickness holding band 8 is attached to the outer peripheral surface of the main portion of the second inner round duct 5 as in the first inner round duct 3. That is, the second thickness retaining band 8 as described above forms a heat insulating layer appropriately and stably according to the lengths of the second inner round duct 5 and the second outer round duct 6. A plurality of inner round ducts 5 are attached along the longitudinal direction of the duct 5. Then, by arranging the second inner round duct 5 in the second outer round duct 6 in the same manner as the first dew condensation prevention round duct 1, the thickness holding band 8 makes the second outer round duct 6 A heat insulating layer having a predetermined thickness is provided between the and the second inner round duct 5, and the second inner round duct 5 is concentrically held in the second outer round duct 6.

Further, as shown in FIG. 3, a concave inner rib 42 recessed inward is spirally provided in the central portion between the goby joints 41 on the outer peripheral surface of the first outer round duct 4. Similarly, in the second outer round duct 6, as shown in FIG. 7, a concave inner rib 62 recessed inward is spirally provided in the central portion between the goby joints 61. By providing these inner ribs 42 and 62, it can be easily determined from the appearance that the dew condensation prevention round ducts 1 and 2 are different from the conventional ordinary round ducts.

Next, a dew condensation prevention round duct connection structure for connecting one ends of the dew condensation prevention round ducts 1 and 2 having such a configuration will be described.

First, one end 5a of the second inner round duct 5 is inserted into one end 3a of the first inner round duct 3, and the guide portion 32 of the first inner round duct 3 and the goby of the second inner round duct 5 are inserted. The first inner round duct 3 and the second inner round duct 5 are connected by screwing the joint portion 51. That is, as shown in FIG. 9, one end 3a of the first inner round duct 3 and one end 5a of the second inner round duct 5 face each other, and the goby joint 51 is placed along the guide portion 32, for example. While rotating the second inner round duct 5, one end 5a of the second inner round duct 5 is inserted into the one end 3a of the first inner round duct 3. As a result, as shown in FIG. 10, the goby joint 51 of one end 5a of the second inner round duct 5 is screwed into the guide portion 32, and the two inner round ducts 3 and 5 are spirally connected (screwed). It is connected.

In such a connected state, as shown in FIG. 11, the guide portion 32 formed adjacent to the goby joint 31 of the first inner round duct 3 is connected to the goby joint 51 of the second inner round duct 5. Are adjacent. Further, the gap between the edge of the one end portion 3a of the first inner round duct 3 and the stepped portion 53 of the second inner round duct 5 is sealed (airtight treatment and fixing treatment) with a sealing material.

Further, as described above, since the first inner round duct 3 is inserted into the first outer round duct 4 and the second inner round duct 5 is inserted into the second outer round duct 6, FIG. 12 As shown in, the dew condensation prevention round ducts 1 and 2 are connected by the inner round ducts 3 and 5. Here, in order to connect the inner round ducts 3 and 5, one end 3a of the first inner round duct 3 protrudes by a predetermined amount from one end edge of the first outer round duct 4, and the second inner round duct 5 One end portion 5a protrudes by a predetermined amount from one end edge of the second outer round duct 6.

Further, the first outer round duct 4 and the second outer round duct 6 are connected via a round duct joint 7. As shown in FIG. 8, the round duct joint 7 is a cylindrical socket composed of a spiral duct, and its inner diameter is set so that one end of the outer round ducts 4 and 6 can be inserted. Further, the first joint fitting portion is formed on one end side 7a with a locus equivalent to the spiral locus of the haze joint portion 41 of the first outer round duct 4, and the second joint fitting portion is fitted on the other end side 7b. The portion is formed with a locus equivalent to the spiral locus of the haze joint portion 61 of the second outer round duct 6.

Here, as described above, since the haze joint portions 41 and 61 have the same shape and spiral locus, in this embodiment, the same joint fitting portion (first joint) is used over the entire length of the round duct joint 7. A fitting portion and a second joint fitting portion) 72 are formed. As shown in FIG. 14, the joint fitting portion 72 is a protruding portion that protrudes outward and has an inverted concave (inverted U-shaped) cross section, and is formed so as to accommodate the goby joint portions 41 and 61. Such a joint fitting portion 72 is formed with a locus equivalent to the spiral locus of the goby joints 41 and 61 (between the goby joints 71), and the goby joints 41 and 61 are inside the joint fitting 72. It is designed to be screwed.

Further, the axial length of the round duct joint 7 is set so that the outer round ducts 4 and 6 can be connected reliably and stably. Further, the round duct joint 7 is provided with a grip portion 73 protruding from the outer peripheral surface. That is, the grip portion 73 has a size and shape (for example, a square plate shape) that can be gripped by a person with a hand or a finger, and the round duct joint 7 is formed on the outer peripheral surface of the central portion in the axial direction of the round duct joint 7. Two are attached (point-symmetrical) so as to face each other with the axis line as the center.

One end of the first outer round duct 4 is inserted into one end side 7a of such a round duct joint 7, and the goby joint 41 of the first outer round duct 4 is fitted into the joint fitting portion 72. As a result, the first outer round duct 4 is connected to the round duct joint 7. Similarly, one end of the second outer round duct 6 is inserted into the other end 7b of the round duct joint 7, and the goby joint 61 of the second outer round duct 6 is fitted into the joint fitting portion 72. By doing so, the second outer round duct 6 is connected to the round duct joint 7.

Specifically, for example, as shown in FIG. 1, the round duct joint 7 is temporarily attached to the second outer round duct 6 in advance. That is, while inserting the goby joint 61 into the joint fitting portion 72 and rotating the round duct joint 7 in one direction, one end side of the second outer round duct 6 is inserted into the round duct joint 7. , The round duct joint 7 is temporarily attached to the second outer round duct 6 over the entire length. Then, the two inner round ducts 3 and 5 are connected as described above, and the state shown in FIG. 12 is obtained. Subsequently, the round duct joint 7 is rotated in the other direction to pull out one end side 7a from the second outer round duct 6, and further rotated to insert the goby joint 41 into the joint fitting portion 72. One end of the first outer round duct 4 is inserted into the one end side 7a of the duct joint 7.

As a result, as shown in FIG. 13, one end of the first outer round duct 4 is inserted and connected to one end side 7a of the round duct joint 7, and one end of the second outer round duct 6 is for the round duct. It is inserted and connected to the other end side 7b of the joint 7. That is, the first outer round duct 4 and the second outer round duct 6 are connected via the round duct joint 7. Further, in such a connected state, as shown in FIG. 14, the goby joint portions 41 and 61 are housed in the joint fitting portion 72 while being screwed with the joint fitting portion 72, and the two outer round ducts 4 , 6 are spirally connected (screwed) to the round duct joint 7.

Here, before inserting one end of the first outer round duct 4 into the round duct joint 7, the insertion position is marked on the outer peripheral surface of the first outer round duct 4. That is, as shown in FIG. 12, the regulation mark 4A is marked with ink or the like at the insertion position where the end edge of the one end side 7a of the round duct joint 7 should be located. Here, the insertion amount of the first outer round duct 4 into the round duct joint 7 and the insertion amount of the second outer round duct 6 into the round duct joint 7 are regulated to a position where they are substantially the same amount. Mark 4A.

In this way, with the two outer round ducts 4 and 6 connected via the round duct joint 7, the edge of the one end side 7a of the round duct joint 7 and the first outer round duct 4 The gap is sealed with a sealing material, and the gap between the edge of the other end side 7b of the round duct joint 7 and the second outer round duct 6 is sealed with the sealing material.

In this way, the first inner round duct 3 and the second inner round duct 5 are screwed and connected, and the first outer round duct 4 and the second outer round duct 6 are connected via the round duct joint 7. The two dew condensation prevention round ducts 1 and 2 are firmly connected by being screwed together.

As described above, according to the dew condensation prevention round ducts 1 and 2, since the heat insulating layer (air layer) having a predetermined thickness is provided between the outer round ducts 4 and 6 and the inner round ducts 3 and 5, the heat insulating material is used. The heat insulating layer makes it possible to prevent dew condensation without wrapping. As a result, it is possible to reduce the labor and time required for wrapping the heat insulating material, the disposal treatment of the waste material of the heat insulating material, the adjustment of the construction schedule, the delivery of the material, the adjustment of the storage, etc. It is possible to reduce the amount and improve economic efficiency and safety. Moreover, since the heat insulating layer is held to a predetermined thickness by the thickness holding band 8, it is possible to stably prevent dew condensation for a long period of time.

Further, since the thickness holding means is only formed by the thickness holding band 8 including a plurality of band-shaped and convex heat insulating layer forming portions 81a and 82, the thickness holding means can be easily configured. Moreover, since the heat insulating layer having a predetermined thickness is formed and held by attaching the thickness holding band 8 to the inner round ducts 3 and 5, the specially shaped outer round ducts 4 and 6 and the inner round ducts 3 and 5 are unnecessary. Existing and ready-made outer round ducts 4 and 6 and inner round ducts 3 and 5 can be used, and the manufacturing cost can be reduced. Further, since the thickness holding band 8 is attached along the circumferential direction of the inner round ducts 3 and 5, it is possible to form and hold a heat insulating layer having a predetermined thickness reliably, evenly and stably.

Further, according to the above-mentioned dew condensation prevention round duct connection structure, the guide portion 32 of the first inner round duct 3 and the goby joint portion 51 of the second inner round duct 5 are screwed together to form the first inner side. The round duct 3 and the second inner round duct 5 are connected. That is, since they are connected by screwing like a screw, the two inner round ducts 3 and 5 are firmly connected and do not easily come off, and the guide portion 32 and the goby joint portion 51 are screwed together. All you have to do is let it. For this reason, it is not necessary to fix at a plurality of places with screws or rivets as in the conventional case, and not only is there no omission of work of screws or rivets or variation in work quality, but also work safety is improved because tools and the like are not required. As a result, the dew condensation prevention round ducts 1 and 2 can be properly, easily, and safely connected to each other.

Further, since the insertion amount of the second inner round duct 5 into the first inner round duct 3 is regulated by the step portion 53, the insertion amount of the second inner round duct 5 is adjusted appropriately and the inner round duct 3 is inserted. 5, that is, the dew condensation prevention round ducts 1 and 2 can be connected more appropriately. That is, the second inner round duct 5 can be properly and easily connected by simply inserting the second inner round duct 5 into the first inner round duct 3 until the edge of one end 3a of the first inner round duct 3 hits the step portion 53. Is possible.

Further, since the outer diameters of the first inner round duct 3 and the second inner round duct 5 are set to be the same, one end portion 5a of the second inner round duct 5 is set to the same inner diameter of the first inner round duct 3. The two inner round ducts 3 and 5 are connected as round ducts having the same diameter over the entire length while being inserted into the one end portion 3a. Therefore, a uniform duct space (intake / exhaust space) is formed over the entire length, and a good intake / exhaust flow path can be secured. Moreover, since one end 5a of the second inner round duct 5 is reduced in diameter and inserted into the one end 3a of the first inner round duct 3, it can be inserted and connected to the first inner round duct 3. It is not necessary to separately provide a member or the like in the second inner round duct 5, and the configuration can be simplified.

On the other hand, since the first outer round duct 4 and the second outer round duct 6 are connected to each other via the round duct joint 7, plate materials, sheet materials, and the like can be used for the first outer round duct 4 and the second outer round duct 4. Compared with the case where the outer round duct 6 is wound and connected, the connection can be made properly and easily, and the appearance is improved.

Moreover, the haze joint 41 of the first outer round duct 4 and the haze joint 61 of the second outer round duct 6 are fitted into the joint fitting portion 72 of the round duct joint 7, so that the two are two. The outer round ducts 4 and 6 are connected. That is, since the spiral haze joints 41 and 61 are fitted in the spiral joint fitting 72 and connected by screwing like a screw, the two outer round ducts 4 and 6 are strong. It is not easily pulled out because it is connected to the joint fitting portion 72, and it is only necessary to fit the goby joint portions 41 and 61 in the joint fitting portion 72. For this reason, it is not necessary to fix at a plurality of places with screws or rivets as in the conventional case, and not only is there no omission of work of screws or rivets or variation in work quality, but also work safety is improved because tools and the like are not required. As a result, the outer round ducts 4 and 6, that is, the dew condensation prevention round ducts 1 and 2 can be properly, easily, and safely connected to each other.

Further, since the round duct joint 7 is provided with the grip portion 73, by holding the grip portion 73 and rotating the round duct joint 7, the goby joint portion 41 can be easily and appropriately contained in the joint fitting portion 72. , 61 can be fitted.

Although the embodiment of the present invention has been described above, the specific configuration is not limited to the above-described embodiment, and even if there is a design change or the like within a range that does not deviate from the gist of the present invention, this embodiment is described. Included in the invention. For example, in the above embodiment, the case where the inner round ducts 3 and 5 and the outer round ducts 4 and 6 have the same shape has been described, but the round ducts having different diameters and the circles having different spiral trajectories at the goby joints are described. It may be ducts. In this case, the locus of the guide portion 32 and the joint fitting portion 72 may be changed according to the locus of the goby joint portion, or the inner diameters of the one end side 7a and the other end side 7b of the round duct joint 7 may be changed.

Further, in the above embodiment, the round duct joint 7 is temporarily attached to the second outer round duct 6, but it may be temporarily attached to the first outer round duct 4. Further, although the regulation mark 4A is marked only on the first outer round duct 4, it may be written only on the second outer round duct 6 or on both outer round ducts 4 and 6.

1 1st dew condensation prevention round duct 2 2nd dew condensation prevention round duct 3 1st inner round duct 3a One end 31 Haze joint 32 Guide part 4 1st outer round duct 41 Haze joint 5 2nd inner circle Duct 5a One end 51 Haze joint 53 Step (regulatory part)
6 Second outer round duct 61 Haze joint 7 Round duct joint 7a One end side 7b Another end 71 Haze joint 72 Joint fitting part (first joint fitting part, first joint fitting part)
73 Grip 8 Thickness holding band (thickness holding means)
81 Band member 81a First heat insulating layer forming part 82 Second heat insulating layer forming part

The invention according to claim 1 is a spiral duct in which a strip-shaped material is spirally wound and adjacent side edges are joined to each other in a spiral shape to form a circular duct, and the gorgeous joint portion spirally protrudes from the surface. The first outer round duct is provided with a first outer round duct which is a spiral duct and a first inner round duct which is a spiral duct and is arranged in the first outer round duct. One end of a first dew condensation prevention round duct having a heat insulating layer having a predetermined thickness between the first inner round duct, a second outer round duct which is a spiral duct, and the spiral duct, which is the first. A second inner round duct comprising a second inner round duct arranged within the second outer round duct and having a heat insulating layer of a predetermined thickness between the second outer round duct and the second inner round duct. A dew condensation prevention round duct connection structure that connects one end of the dew condensation prevention round duct, and a guide portion that projects inward to one end of the first inner round duct is a haze of the second inner round duct. It is formed on a locus equivalent to the spiral locus of the joint portion, and one end of the second inner round duct is inserted into one end of the first inner round duct, and a guide portion of the first inner round duct is inserted. When a goby junction of the second inner round duct by the goby junction with the guide portion by screwing adjacent to the first inner round duct and said second inner circle duct is connected It is characterized by being.

Claims (6)

A first outer round duct which is a spiral duct and a first inner round duct which is a spiral duct and is arranged in the first outer round duct are provided, and the first outer round duct and the first outer round duct are provided. One end of a first dew condensation prevention round duct having a heat insulating layer of a predetermined thickness between the inner round ducts of 1.
A second outer round duct which is a spiral duct and a second inner round duct which is a spiral duct and is arranged in the second outer round duct are provided, and the second outer round duct and the second outer round duct are provided. A dew condensation prevention round duct connection structure for connecting one end of a second dew condensation prevention round duct having a heat insulating layer having a predetermined thickness between the two inner round ducts.
A guide portion protruding inward at one end of the first inner round duct is formed on a locus equivalent to the spiral locus of the goby joint of the second inner round duct.
One end of the second inner round duct is inserted into one end of the first inner round duct, and the guide portion of the first inner round duct and the goby joint of the second inner round duct are screwed together. By doing so, the first inner round duct and the second inner round duct are connected.
Condensation prevention round duct connection structure. A regulating unit for regulating the amount of insertion of the second inner round duct into the first inner round duct is provided.
The dew condensation prevention round duct connection structure according to claim 1. The outer diameters of the first inner round duct and the second inner round duct are set to the same diameter, and one end of the second inner round duct is reduced in diameter to reduce the diameter of one end of the first inner round duct. Inserted in,
The dew condensation prevention round duct connection structure according to any one of claims 1 or 2. The outer diameters of the first outer round duct and the second outer round duct are set to be the same, and the first outer round duct and the second outer round duct are set via a cylindrical round duct joint. Is connected,
The dew condensation prevention round duct connection structure according to any one of claims 1 to 3, wherein the dew condensation prevention round duct connection structure is characterized. In the round duct joint, the first joint fitting portion protruding outward to one end side and having a reverse concave cross section is formed with a locus equivalent to the spiral locus of the haze joint portion of the first outer round duct. A second joint fitting portion having an inverted concave cross section protruding outward toward the other end side is formed with a locus equivalent to the spiral locus of the haze joint portion of the second outer round duct.
By inserting one end of the first outer round duct into one end side of the round duct joint and fitting the goby joint of the first outer round duct into the first joint fitting portion. The first outer round duct is connected to the round duct joint, one end of the second outer round duct is inserted into the other end side of the round duct joint, and the inside of the second joint fitting portion is inserted. The second outer round duct is connected to the round duct joint by fitting the haze joint portion of the second outer round duct to the duct.
The dew condensation prevention round duct connection structure according to claim 4. The round duct joint is provided with a grip portion that protrudes from the outer peripheral surface.
The dew condensation prevention round duct connection structure according to claim 5.

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