JPH0725540Y2 - Air duct connection structure - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a connection structure of an air conditioning duct formed of an inorganic fiber such as glass fiber.

"Conventional technology" In buildings such as skyscrapers, hotels, hospitals and gymnasiums, duct equipment for air conditioning is installed. As these ducts, those made of an iron plate or those made of a glass fiber mat are used.

As the duct formed of the glass fiber mat, a plate-shaped glass fiber mat with a V-shaped groove formed and bent to form a square tube shape, or a glass fiber mat formed into a cylindrical shape is used. Has been done. In this case, the outer surface of the duct is coated with a surface covering material such as aluminum kraft paper, glass fiber reinforced aluminum kraft paper, plastic fiber reinforced aluminum kraft paper, etc. to give the effect of non-breathing, moisture proofing, and reinforcement. The inner surface is coated with black resin to prevent glass fibers from scattering due to ventilation.

Ducts made of glass fiber mats are superior in heat insulation and sound absorption compared to ducts made of iron plates, and have the advantage of being about 1/4 or less in weight. For this reason, it is not necessary to provide a silencer or the like, the burden on the structure is reduced, and it is possible to reduce man-hours and members to shorten the construction period and reduce the cost. Further, even when cold air is passed inside during cooling, dew condensation does not occur on the outer surface.

[Problems to be solved by the invention] However, when a conventional duct made of a glass fiber mat is connected, air leaks easily occur from the joint between the ducts, and it is necessary to perform a severe sealing work on the joint. It was

Further, when connecting the ducts, it is necessary to hold the ducts so that the connecting portions do not bend, and it is difficult to make the linearity of the connecting portions accurate and to provide sufficient rigidity.

Therefore, an object of the present invention is to provide an air-conditioning duct connection structure that prevents air leakage from a joint between ducts, enhances linearity and rigidity of a connecting portion, and facilitates piping construction. It is in.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a connection structure for an air conditioning duct formed of inorganic fibers, wherein the air conditioning duct is a duct body formed of inorganic fibers. It is composed of an outer cylinder and an inner cylinder that has substantially the same length as the outer cylinder and is slidably inserted in the inner hole of the outer cylinder in the cylinder axis direction. While being arranged, one end of the inner cylinder of these air conditioning ducts is inserted into the inner hole of the outer cylinder of the adjacent air conditioning duct, respectively, and the seam of each inner cylinder and the seam of each outer cylinder are displaced from each other. It is characterized in that they are connected as follows.

Hereinafter, the present invention will be described in more detail with reference to specific examples.

In the air-conditioning duct used in the present invention, the outer cylinder forming the duct body is formed of an inorganic fiber such as glass fiber or rock wool. The inorganic fiber can be formed into a desired shape by adding a binder such as a thermosetting resin and depositing it in a mat shape, pressing it to a predetermined thickness and density, and curing the binder. in this case,
The inorganic fiber may be directly formed into a tubular shape, or may be formed into a plate shape in advance and then bent into a tubular shape. When formed from glass fibers, the density is preferably about ³⁰ to 150 kg / m ³ , and the thickness is preferably about 10 to 100 mm.

The inner cylinder inserted into the inner hole of the outer cylinder of the air conditioning duct has substantially the same length as the outer cylinder so that the inner cylinder can be completely accommodated inside without protruding from the outer cylinder. As the material of the inner cylinder, various materials are used according to the purpose of use. In one of the preferred embodiments of the present invention, the inner cylinder is made of a moisture impermeable material. As such a material, for example, a paper foil to which a metal foil such as aluminum or a synthetic resin film is attached to the inner surface or the outer surface thereof, or a tube formed of a synthetic resin such as vinyl chloride is preferably used. In another preferred aspect of the present invention, the inner cylinder is made of a nonflammable material. Examples of such a material include those formed of a metal porous plate. in this case,
The reason for using a perforated plate is to prevent the sound absorbing property from being impaired.

In a preferred aspect of the present invention, a surface covering material is attached to the outside of the outer cylinder of the air conditioning duct. Although this front cover material is not necessary, it prevents the outer cylinder made of inorganic fibers from absorbing moisture due to rain or moisture and lowering the heat insulating property and sound absorbing property, and when the hand etc. touches at the time of work etc. It is effective because it does not give the tingling feel of inorganic fibers. As the surface material, for example, aluminum kraft paper, glass fiber reinforced aluminum kraft paper, plastic fiber reinforced aluminum kraft paper, synthetic resin film of polyethylene or the like is preferably used.

Further, the air conditioning duct used in the present invention may have a cylindrical shape or a rectangular tube shape as a whole. In this case, it is preferable that the inner cylinder is formed in conformity with the outer cylinder so as to fit the outer cylinder.

In the connection structure of the air conditioning duct of the present invention, for example, the inner cylinder of the air conditioning duct is projected outward from one end of the outer cylinder by a predetermined length, and the air conditioning ducts are arranged in the cylinder axial direction. It is formed by inserting the end portion of the protruding inner cylinder into the inner hole of the outer cylinder of the adjacent air conditioning duct from the end surface where the inner cylinder does not protrude, and connecting the end portion.

Alternatively, a plurality of the air conditioning ducts are arranged in the cylinder axis direction,
The inner cylinder of the air-conditioning duct at one end is pushed in the direction of the adjacent air-conditioning duct, and the end surfaces of the inner cylinders are butted against each other and moved in the cylinder axis direction at the same time. It can also be formed by being inserted into the inner hole of the outer cylinder.

The air-conditioning duct connection structure of the present invention can be used for both heating and cooling applications, but when used for heating, it is preferable that the inner cylinder be impermeable.

"Operation" According to the connection structure of the air conditioning duct of the present invention, the following operations are brought about.

(1) The inner cylinder inserted into the inner hole of the outer cylinder is slid in the cylinder axial direction so as to protrude from one end, and the protruding portion is inserted into the inner hole of the adjacent outer cylinder, so that the adjacent outer cylinder is formed. It is possible to push out the inserted inner cylinder and repeat such a work to successively connect the ducts.

(2) As a result of the above, the end faces of the inner cylinders are in close contact with each other,
Moreover, since the seam of the inner cylinder and the seam of the outer cylinder are displaced from each other, air leak from the seam between the ducts can be prevented, and the air inside the duct and the outside air can be almost completely shut off.

(3) Since the seam of the inner cylinder and the seam of the outer cylinder are displaced from each other, the inner cylinder maintains its linearity at the seam of the outer cylinder, and the outer cylinder exhibits the linearity at the seam of the inner cylinder. As a result, the duct connection portion has good linearity and rigidity.

(4) Since the ducts can be temporarily joined together during the construction as described above, the piping construction work becomes easy.

(5) Since the inner cylinder is slidably inserted in the inner hole of the outer cylinder, and the inner cylinder has almost the same length as the outer cylinder, the inner cylinder is housed inside the outer cylinder during transportation. Can be compactly packed.

(6) Since the inner surface of the outer cylinder made of the inorganic fibers is covered with the inner cylinder, it is possible to almost completely prevent the inorganic fibers from being scattered by the air flow.

(7) By smoothly forming the inner surface of the inner cylinder, it is possible to reduce the pressure loss during air blowing. in addition,
The inner cylinder can also improve the pressure resistance at the time of blowing air.

On the other hand, in the preferred embodiment of the present invention, the following actions are further brought about.

(8) In the conventional duct, when hot air is passed inside during heating, hot air enters the inorganic fiber layer and tends to cause dew condensation on the inner surface of the surface material that is in contact with cold outside air. As a result, the inorganic fibers tended to absorb moisture to lower the heat insulating property and sound absorbing property.However, in a preferred embodiment of the present invention, when the inner cylinder is made of a moisture impermeable material, it is used for heating. When heating, the heating is prevented from penetrating into the inorganic fiber layer of the outer cylinder, the dew condensation in the inorganic fiber layer of the outer cylinder is reduced, and the heat insulating property and sound absorbing property of the inorganic fiber are maintained for a long period of time. You can

(9) In another preferred embodiment of the present invention, when the inner cylinder is made of a non-combustible material, both the inner cylinder and the outer cylinder are made of a non-combustible material, which is preferable from the viewpoint of fire prevention. Become. In this case, if the inner cylinder is formed of a metal porous plate, it can be made nonflammable without impairing sound absorption.

"Embodiment" FIGS. 1 and 2 show an example of an air conditioning duct used in the connection structure of the present invention.

As shown in the figure, this air conditioning duct has a cylindrical outer cylinder 2
And an inner cylinder 3, and a surface covering material 4 is attached to the outer peripheral surface of the outer cylinder 2.

In this embodiment, the outer cylinder 2 is formed by depositing short glass fibers with a binder such as a thermosetting resin deposited thereon, molding this mat into a cylindrical shape, and heat-curing the binder. In this embodiment, the glass short fibers have a density of 64 kg / m ³ and the outer cylinder 2 has a thickness of 25 mm, but the density and the thickness can provide the duct with sufficient strength and heat insulation. The range can be changed freely.

As the inner cylinder 3, a paper cylinder having an aluminum foil adhered to the inner peripheral surface is used in this embodiment, but a cylinder made of a synthetic resin such as vinyl chloride may be used. The length of the inner cylinder 3 is substantially the same as the length of the outer cylinder 2, and the outer diameter of the inner cylinder 3 is sized to fit the inner hole 5 of the outer cylinder 2 with a slight frictional force. The inner cylinder 3 is slidably inserted in the inner hole 5 of the outer cylinder 2 in the cylinder axial direction.

Although glass fiber reinforced aluminum kraft paper is used as the surface material 4 in this embodiment, other sheet materials such as plastic fiber reinforced aluminum kraft paper, aluminum kraft paper, and polyethylene film may also be used. Good. The outer cover material 4 may be attached to the outer peripheral surface of the outer cylinder 2 after the outer cylinder 2 is formed, or when the outer cylinder 2 is formed, when the glass short fiber deposit is pressed to cure the binder. You may attach it.

FIG. 3 is a longitudinal sectional view showing an embodiment of the connection structure of the air conditioning duct according to the present invention, in which the air conditioning duct 1 is connected and piped in the cylinder axis direction.

Since the inner cylinder 3 is slidable in the cylinder axis direction, it is made to project outside from one end of the outer cylinder 2 by a predetermined length in advance during construction. In this way, the air-conditioning ducts 1 with the inner cylinders 3 protruding are arranged in the cylinder axis direction, and the ends of the protruding inner cylinders 3 are inserted into the inner holes 5 of the outer cylinders 2 of the adjacent air-conditioning ducts 1. The tube 3 is inserted and connected from the end surface which does not project.

Alternatively, when a plurality of air-conditioning ducts 1 are arranged in the cylinder axis direction and the inner cylinder 3 of the air-conditioning duct 1 at one end thereof is extruded toward the adjacent air-conditioning duct 1, the end surface of each inner cylinder 3 Are abutted against each other and move in the cylinder axis direction at the same time, so that each inner cylinder 3 is inserted into the inner hole 5 of the outer cylinder 2 of the adjacent air conditioning duct 1. In this way, a plurality of air-conditioning ducts 1 can be arranged in the cylinder axis direction and connected simultaneously.

Such a connection method is used for the air conditioning duct 1 during construction.
It can also be used as a temporary joint, and the construction workability can be improved.

In this connected state, the outer cylinder 2 and the inner cylinder 3 are in close contact with each other with their end faces abutted against each other. Therefore, by applying an adhesive to the end surfaces of the outer cylinder 2 and the inner cylinder 3 in advance, the outer cylinder 2 and the inner cylinder 3 can be connected and fixed in the cylinder axis direction. Further, a wide adhesive tape can be wound around the outer periphery of the joint 6 of the outer tube 2 to further ensure the connection.

In this case, the seam 6 of the outer cylinder 2 and the seam 7 of the inner cylinder 3 are
The joints 6 and 7 are formed at positions displaced in the cylinder axis direction and have a structure in which the mutual joints are sealed by the mutual wall portions.
The airtightness is improved, and air leak can be prevented.

Further, since the inner cylinder 3 maintains its linearity at the joint 6 of the outer cylinder 2 and the outer cylinder 2 maintains its linearity at the joint 7 of the inner cylinder 3, the linearity and rigidity of the connecting portion are improved. To do.

When this air-conditioning duct 1 is applied to heating and warm air is flown inside, the warm air flows inside the inner cylinder 3, but since the inner cylinder 3 is impermeable, the warm air passes outside the inner cylinder 3. Since the warm air does not flow into the outer cylinder 2 and the warm air does not come into contact with the surface covering material 4 that is in contact with the cold outer air, dew condensation is prevented from occurring in the glass fiber layer of the outer cylinder 2.

FIG. 4 shows another example of the air conditioning duct used in the connection structure of the present invention.

The air-conditioning duct 11 has a rectangular tube-shaped outer tube 12 formed by bending a glass fiber mat, and a vinyl chloride inner tube 13 having the same rectangular tube shape is slidably inserted therein.
The outer cover 12 is made of aluminum kraft paper and is attached to the outer surface of the cover 12.

The outer cylinder 12 has a plate-shaped glass fiber mat divided into four lateral widths to set three bent portions, and V-shaped cut grooves 12a are formed along these bent portions. It is formed by bending the groove 12a into a rectangular tube. The butted portion 12b of the glass fiber mat is fixed with an adhesive or an adhesive tape.

The inner cylinder 13 may be formed by adhering an aluminum foil or the like to the inner circumference or the outer circumference of the paper cylinder as in the above embodiment. Further, the surface covering material 14 may be a sheet other than aluminum kraft paper.

In this way, the shape of the duct may be either cylindrical or rectangular. In another preferred embodiment of the present invention, the inner cylinders 3 and 13 in each of the above embodiments may be noncombustible ducts, for example, by using a metal cylinder or a cylinder made of a perforated metal plate. it can. In this case, if the inner cylinders 3 and 13 are cylinders made of a perforated metal plate,
Since the outer cylinders 2 and 12 made of inorganic fibers absorb sound, good sound absorption can be maintained.

[Advantages of the Invention] As described above, according to the connection structure of the air conditioning duct of the present invention, the outer cylinder forming the duct main body formed of the inorganic fiber and the outer cylinder having substantially the same length as this outer cylinder are connected. An air-conditioning duct is composed of an inner cylinder slidably inserted in the inner hole in the cylinder axis direction, and a plurality of air-conditioning ducts are arranged in the cylinder axis direction, and one end of the inner cylinder of these air-conditioning ducts is arranged. Are inserted into the inner holes of the outer cylinders of adjacent air conditioning ducts and connected so that the joints of the inner cylinders and the joints of the outer cylinders are at different positions. In this case, the inner cylinder can be stored in the outer cylinder and packed compactly, and the duct can be temporarily connected during construction to facilitate piping.After connecting the ducts, air leakage from the joints of the ducts is effective. And increase the linearity and rigidity of the connecting part. You can Further, by providing the inner cylinder, it is possible to prevent the inorganic fibers forming the outer cylinder from being scattered during air blowing, and by smoothing the inner surface of the inner cylinder, the pressure loss during air blowing can be significantly reduced. Excellent effects such as improved pressure resistance can be expected. Further, in one of the preferred embodiments of the present invention, if the inner cylinder is made of a moisture impermeable material, it is possible to reduce the dew condensation inside the duct which is likely to occur when warm air is flowed inside. Furthermore, in another preferred embodiment of the present invention, if the inner cylinder is made of a non-combustible material, the duct can be made non-combustible to contribute to fire prevention.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing an example of an air conditioning duct used in the connection structure of the present invention, FIG. 2 is a cross-sectional view of the air conditioning duct, and FIG. 3 is a view of the present invention using the air conditioning duct. FIG. 4 is a vertical sectional view showing an embodiment of the connecting structure, and FIG. 4 is a horizontal sectional view showing another example of the air conditioning duct used in the connecting structure of the present invention. In the figure, 1 and 11 are air conditioning ducts, 2 and 12 are outer cylinders, 3 and 13 are inner cylinders, 4 and 14 are front covering materials, 5 is an inner hole, and 6 is a joint of outer cylinders.
7 is a joint of the inner cylinder.

Claims (8)

[Scope of utility model registration request] 1. A connection structure of an air conditioning duct made of inorganic fibers, wherein the air conditioning duct has an outer cylinder forming a duct main body made of inorganic fibers, and has substantially the same length as the outer cylinder. A plurality of air-conditioning ducts are arranged in the cylinder axis direction, and one end of the inner cylinder of each of the air-conditioning ducts is arranged in the inner hole of the outer cylinder slidably in the cylinder axis direction. Are inserted into the inner holes of the outer cylinders of the adjacent air conditioning ducts, and are connected so that the joints of the inner cylinders and the joints of the outer cylinders are displaced from each other. Connection structure. 2. The connection structure for an air conditioning duct according to claim 1, wherein the inner cylinder of the air conditioning duct is formed of a moisture impermeable material. 3. The air-conditioning duct connection structure according to claim 2, wherein the inner cylinder of the air-conditioning duct is formed by attaching a metal foil or a synthetic resin film to an inner surface or an outer surface of a paper cylinder. 4. The air-conditioning duct connection structure according to claim 2, wherein the inner cylinder of the air-conditioning duct is a cylinder made of synthetic resin. 5. The connection structure for an air conditioning duct according to claim 1, wherein the inner cylinder of the air conditioning duct is made of a non-combustible material. 6. The air-conditioning duct connection structure according to claim 5, wherein the inner cylinder of the air-conditioning duct is formed of a perforated metal plate. 7. The air-conditioning duct connection structure according to claim 1, wherein a surface covering material is attached to the outside of the outer cylinder of the air-conditioning duct. 8. The air-conditioning duct connection structure according to claim 1, wherein the air-conditioning duct has a rectangular tube shape or a cylindrical shape as a whole.