JP3761108B2 - Air layer insulation duct - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an air layer insulation duct for transferring a fluid, for example, an air conditioning gas.
[0002]
[Prior art]
Conventional heat-insulating ducts for air conditioning are, for example, the surface of a duct main pipe made of a thin steel plate is covered with a heat insulating material 5 (glass wool, rock wool, etc.) having a thickness of 20 to 25 mm. The surface of the heat insulating material is covered with a protective cover.
In general, on the site, after the duct facility work is completed, the surface of the installed duct is covered with a heat insulating material, and the surface is covered with a protective cover. It was necessary to take long.
Insulation materials such as glass wool and rock wool are generally water-absorbing and are difficult to dry once they absorb water. It was necessary to take. In particular, heat insulating materials such as glass wool and rock wool inherently have a phenomenon in which the heat insulating performance deteriorates when water is absorbed and wetted.
[0003]
In order to remedy these inconveniences, a double pipe type heat insulation duct of Japanese Patent Application No. 5-70562 has been developed by a member of the present applicant.
This double-pipe heat insulation duct forms an air layer having a thickness of 10 to 30 mm by interposing spacers at appropriate intervals between an inner tube serving as a flow path and an outer tube covering the inner tube. In addition, as the spacer, for example, a glass wool or rock wool molded product formed in a bowl shape, a calcium carbonate foam, a plastic or elastomer molded product, or the like is used.
According to such a double-pipe heat insulation duct, an appropriate heat insulation effect can be exhibited by the air layer, and the above disadvantages can be improved.
[0004]
[Problems to be solved by the invention]
However, the following problems still need to be solved in order to realize the product.
(1) In addition to the inner and outer tubes, a separate spacer must be prepared.
(2) After fixing the spacers at various locations on the outer peripheral surface of the inner tube, the outer tube is fitted, but it is not easy to fix the spacer to the inner tube.
(3) The inner tube and the outer tube to be overlapped have a considerable length, and the outer tube is fitted to the outside of a number of spacers fixed in various places, so that fitting is not easy. .
(4) Although it is a factory work, the assembly work mainly relies on manual work, and therefore it takes a lot of labor and time to assemble.
(5) There is much damage to members, and the yield is poor.
(6) Overall, the cost is considerably high.
Therefore, the present invention aims to solve the above-mentioned problems and solve these problems.
[0005]
[Means for Solving the Problems]
Here, the invention of the air layer heat insulation duct according to claim 1 is characterized in that a duct main pipe serving as a flow path for air conditioning gas transfer is used as an inner pipe, and a coated outer pipe covering the duct main pipe is used as an outer pipe. Each formed into a cylindrical shape, and
A spiral outward chevron rib is formed on the inner tube and a spiral inward chevron rib is formed on the outer tube so as to cross each other, and further, both spiral chevron ribs are provided at the intersection. By having a contact, it is provided to hold an air layer having a thickness of 5 to 20 mm between these inner and outer tubes .
[0006]
According to a second aspect of the present invention, there is provided an air-layer heat insulation duct according to the first aspect of the present invention , wherein an outer layer is provided on the outer side of the coated outer tube and another coated outer tube is overlapped with the outer coated tube. it is, to an air layer of a plurality of layers.
[0007]
The invention of the air-layer heat insulation duct according to claim 3 is characterized in that a duct main pipe serving as a flow path for air conditioning gas transfer is used as an inner pipe, and a coated outer pipe covering the duct main pipe is used as an outer pipe. Formed into a shape, and
The inner pipe is provided with spiral outward ribs and the inner pipe is formed in a reverse winding so as to cross each other, and both spiral ribs have a contact at the intersection. Thus, an air layer having a thickness of 5 to 20 mm is provided between the inner and outer pipes .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Part 1.
FIG. 1 is a cross-sectional view showing an embodiment of an air layer heat insulation duct according to the first and second aspects of the present invention.
In FIG. 1, 1 is a duct main pipe which is an inner pipe, and this duct main pipe 1 is a belt plate made of, for example, a galvanized steel plate, a stainless steel plate, a vinyl chloride resin-coated steel plate having a thickness of 0.5 to 2.0 mm. Thus, a gob-tight spiral cylinder is formed. 11 is goby tightening.
In the course of its production, a spiral outward chevron rib 12 having a rib height of about 3 to 20 mm is formed in the duct main pipe 1 and, for example, in the case of a right-handed spiral cylinder, it is molded and arranged in a right-handed manner. Yes.
Reference numeral 2 denotes a sheathed outer tube that is stacked on the outside of the duct main tube 1 with an air layer 3 as a heat insulating layer having a thickness of about 5 to 20 mm. The sheathed outer tube 2 is also the same as the case of the duct main tube 1. In addition, for example, a strip made of galvanized steel plate, stainless steel plate, vinyl chloride resin-coated steel plate having a thickness of 0.5 to 2.0 mm is formed into a spiral tube made of a goose-tightened spiral duct 1 and a reverse spiral. In the process of manufacturing, a spiral inward mountain-shaped rib 22 having a rib height of about 3 to 20 mm is formed on the outer sheath tube 2 in the case of, for example, a left-handed spiral cylinder (in this case, the duct main tube 1 and its spiral outward mountain). The mold rib 12 is a right-handed spiral) and is arranged in the same left-handed manner, and the spiral inward chevron rib 22 is formed with a cross-contact with the spiral outward chevron rib 12 of the duct main pipe 1. The air layer 3 is formed and held 21 is goby tightening.
[0009]
The duct main pipe 1 and the outer sheath pipe 2 may be continuously formed by a gouge-tight spiral cylinder forming machine, and both may be manufactured at the same time or the latter in the subsequent process of the former. By doing so, it can be produced at high speed without relying on manual work, the productivity can be greatly improved, it can be made simple and economical, and the product cost can be greatly reduced, and , it is possible to obtain a lighter. Further, the mechanical strength can be greatly enhanced by the spiral outward chevron rib 12, the spiral inward chevron rib 22, and the gouge fastenings 11 and 21. As described above, the thickness of the air layer 3 is set to about 5 to 20 mm. In other words, if the thickness of the air layer 3 is less than 5 mm, so-called radiation heat transfer and heat bridge phenomena occur, and the heat insulation effect is reduced, and if it exceeds 20 mm, convection easily occurs in the air layer. This is because the heat insulation effect is reduced. As for the heat insulation effect, even if the air layer 3 is a single layer, good data comparable to the conventional product with the heat insulating material and the protective cover could be obtained. The construction test at the construction site made it easier to work due to its light weight, and it was confirmed that the duct facility construction was sufficient, and that all insulation work and water-wetting prevention work covering the insulation and protective cover could be omitted. . The exposed outer tube 2 after the duct facility construction had a beautiful appearance that matched the sense of the space age. Note that the duct main pipe 1 and the outer sheath pipe 2 may be formed by vertical winding welding instead of forming a gob-tight spiral cylinder.
[0010]
Part 2.
FIG. 2 is a cross-sectional view showing an embodiment of an air layer heat insulation duct according to the invention of claim 2 in which two air layers are provided.
In FIG. 2, 1 is a duct main pipe which is an inner pipe, and this duct main pipe 1 is a strip plate made of, for example, galvanized steel plate, stainless steel plate, vinyl chloride resin-coated steel plate having a thickness of 0.5 to 2.0 mm. Thus, a gob-tight spiral cylinder is formed. 11 is goby tightening.
In the course of its production, a spiral outward chevron rib 12 having a rib height of about 3 to 20 mm is formed in the duct main pipe 1 and, for example, in the case of a right-handed spiral cylinder, it is molded and arranged in a right-handed manner. Yes.
2-1 is a first outer sheath tube 2-2 that is laminated by holding a first air layer 3-1, which is a heat insulating layer having a thickness of about 5 to 20 mm, outside the duct main pipe 1. The outer layer of the second layer is an outer tube of the second layer which is stacked by holding the air layer 3-2 of the second layer, which is a heat insulating layer having a thickness of about 5 to 20 mm, outside the outer layer of the first layer. As in the case of the duct main pipe 1, the outer jacket pipe is also a first-layer outer jacket pipe made of, for example, a strip of zinc-coated steel sheet, stainless steel sheet, vinyl chloride resin-coated sheet steel having a thickness of 0.5 to 2.0 mm. 2-1 is a duct main tube 1 and the second outer sheath tube 2-2 is a first layer outer sheath tube, each of which is formed in a spiral shape with a reverse spiral relationship. Then, each of the coated outer pipes 2-1 and 2-2 is provided with a spiral inward chevron rib 22-1, 22-2 having a rib height of about 3 to 20 mm and a spiral outward chevron rib 23-1, for example. Of the first layer When the outer tube 2-1 is a left-handed spiral tube and the second air layer 3-2 is a right-handed spiral tube (in this case, the duct main pipe 1 and its spiral outward chevron rib 12 are a right-handed spiral. ) Includes a left-handed outer sheath 2-1 on the first layer and a right-handed outer sheath 2-2 on the second layer, that is, a spiral inward mountain adapted to the respective spiral direction. The mold ribs 22-1, 22-2 and the spiral outward chevron ribs 23-1 are formed and arranged accordingly, and the spiral inward chevron ribs 22- of the first-layer coated outer tube 2-1 are arranged. 1 and the spiral outward chevron rib 12 of the duct main pipe 1, the spiral inward chevron rib 22-2 of the second outer sheathed pipe 2-2, and the spiral of the outer sheath outer pipe 2-1 of the first layer A cross contact is formed on each of the outwardly facing chevron ribs 23-1, and an air layer 3-1 and a second air layer 3-2 are formed and held in the first layer. 21-1 and 21-2 are goby tightening. However, the coated outer tube 2-2 of the second layer is not provided with the spiral outward chevron rib, but it may be present (see FIG. 3).
The production, function, application, performance, etc. are the same as in case 1 and are omitted.
[0011]
Part 3.
FIG. 3 is a cross-sectional view showing another embodiment of the air-layer heat insulation duct according to the invention of claim 2 in which the air layer has three layers.
In the case of FIG. 3, a third layer air layer 3-3, which is a heat insulation layer having a thickness of about 5 to 20 mm, is further held outside the air layer heat insulation duct of part 2 above, so that the third layer coated outer tube is provided. It is a stack of 2-3.
In this case, the third-layer coated outer tube 2-3 is formed in the same manner as the second-layer coated outer tube 2-2 and in a reverse spiral relationship, and is formed as a spiral-clamped spiral tube. The chevron rib 22-3 and the spiral outward chevron rib 23-3 are also formed and arranged in the forward direction, and the corresponding spiral outward chevron is similarly applied to the outer sheath tube 2-2 of the second layer. The mold ribs 23-3 are formed and arranged, and the spiral inward mountain-shaped ribs 22-3 of the third-layer coated outer tube 2-3 and the spiral-shaped outer mountain of the second-layer coated outer tube 2-2 are formed. The third air layer 3-3 is formed and held by forming a cross contact with the mold rib 23-2. 21-3 is goby tightening. However, the spiral outward chevron rib 23-3 of the third outer sheath tube 2-3 may be omitted.
Others are the same as those described in Part 2 above and will not be described.
[0012]
Part 4.
FIG. 4 is a sectional view showing an embodiment of an air layer heat insulation duct according to the invention of claim 3.
In the case of FIG. 4, in the air layer heat insulation duct of part 1 above, the spiral outward chevron rib 12 of the duct main pipe 1 and the spiral inward chevron rib 23 of the first outer sheath pipe 2. Are replaced with a spiral outward flange 13 and a spiral inward flange 24.
Others are the same as in case 1 above, and the description is omitted.
[0013]
【The invention's effect】
According to the first, second, and third aspects of the invention, the configuration described above has the following effects.
(1) Since the cross-contact is formed by forming spiral chevron ribs or ridge ribs having an inverse relationship between the inner pipe and the outer pipe, the formation of an air layer as a heat insulating layer can be ensured.
(2) Since the cross-contacts are formed by spiral chevron ribs or ridge ribs that have an inverse relationship between the inner and outer pipes, the contact area between the inner and outer pipes can be minimized, and the heat bridge is also small. And heat insulation performance can be kept good.
(3) Since an air layer is formed by forming a cross contact point on the spiral chevron rib or ridge rib having an inverse relationship between the inner tube and the outer tube, a separate spacer is not required.
(4) Since a separate spacer is not required, it is not necessary to fix the spacers at various locations on the outer peripheral surface of the inner tube.
(5) It can be manufactured automatically and continuously in the factory, and there is no need to fit long inner pipe and outer pipe.
(6) It can be manufactured continuously mechanically, so there is no need to rely on manual work, and it does not take time and effort for assembly.
(7) Since it can be manufactured exclusively mechanically and continuously, it can be produced at a high speed and the productivity can be greatly improved.
(8) Since it can be manufactured continuously mechanically, there is little damage in the manufacturing process, and the air layer is reliably formed by spiral chevron ribs or ribs that are inversely related to the inner and outer pipes. As a result, the yield can be significantly improved.
(9) The mechanical strength can be greatly increased by the spiral chevron rib or the rib rib having the inverse relationship between the inner tube and the outer tube.
(10) Since a separate spacer or heat insulating material is not required, the product can be made simple and economical, can be appropriately simplified, and can be reduced in weight.
(11) Product cost can be greatly reduced from the above.
(12) Work on the construction site can be facilitated by reducing the weight of the product
(13) Since the product itself has heat insulation properties, it is only necessary to perform duct facility construction at the construction site, and there is no need for heat insulation work to cover the outer surface of the duct with a heat insulating material or a protective cover.
(14) Since the heat insulation layer of the product itself is an air layer and does not use heat-insulating material with water absorption, it is not necessary to take measures to prevent water wetting.
(15) Since only duct facility construction is required, the construction quality can be greatly improved, the reworking work can be reduced, and the finish can be improved.
(16) From the above, the construction period can be greatly reduced at the construction site.
(17) Overall, construction costs can be greatly reduced.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of Embodiment 1 of an air layer heat insulation duct according to the first and second aspects of the present invention;
FIG. 2 is a sectional view of Embodiment 2 of the air-layer heat insulation duct according to the first and second aspects of the present invention.
FIG. 3 is a sectional view of the third embodiment of the air-layer heat insulation duct according to the first and second aspects of the present invention.
4 is a sectional view of Embodiment 4 of the air-layer heat insulation duct according to the invention of claim 3. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Duct main pipe 2 ... Coated outer pipe 2-1 ... First layer coated outer pipe 2-2 ... Second layer coated outer pipe 2-3 ... Third layer coated outer pipe 3 ... Air layer 3-1 ... Air layer of the first layer 3-2 ... Air layer of the second layer 3-3 ... Air layer of the third layer
11 ... Tightening the duct main
21… Seal tightening of outer sheath
21-1 ... Seal tightening of the outer sheath of the first layer
21-3… Tightening of the outer sheath of the third layer
12 ... Duct main spiral outward chevron rib
22 ... Spiral inward chevron rib of the outer sheath
22-1 ... Spiral inward chevron rib of the outer sheath of the first layer
22-2 ... Spiral inward chevron rib of the outer sheath of the second layer
22-3 ... Spiral inward chevron rib of the outer sheath of the second layer
23-1 ... Spiral outward chevron rib of the outer sheath of the first layer
23-2 ... Spiral outward chevron rib of the outer sheath of the second layer
23-3 ... Spiral outward chevron rib of the outer sheath of the second layer
13 ... Spiral outward rib
24 ... Spiral inward ribs

Claims (3)

As the inner pipe, a duct main pipe serving as a flow path for air conditioning gas transfer, and as the outer pipe, a coated outer pipe covering the duct main pipe is formed in a cylindrical shape, and
A spiral outward chevron rib is formed on the inner tube and a spiral inward chevron rib is formed on the outer tube so as to cross each other, and further, both spiral chevron ribs are provided at the intersection. An air layer insulation duct characterized by having an air layer having a thickness of 5 to 20 mm between the inner and outer pipes by having a contact . The air-layer heat insulation duct according to claim 1 , wherein a plurality of air layers are formed by holding an air layer between the outer sheath tube and another outer sheath tube on the outside of the outer sheath tube . Forming an inner pipe as a duct main pipe serving as a flow path for air-conditioning gas transfer , and forming an outer pipe as a coated outer pipe covering the duct main pipe in a cylindrical shape; and
The inner pipe is provided with spiral outward ribs and the inner pipe is formed in a reverse winding so as to cross each other, and both spiral ribs have a contact at the intersection. Thus, an air layer heat insulation duct provided to hold an air layer having a thickness of 5 to 20 mm between the inner and outer pipes .

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