Air conditioning duct

Abstract

To provide an air conditioning duct which can efficiently supply air having a prescribed temperature by an air conditioner to an indoor space of an architectural structure.SOLUTION: An air conditioning duct 1 is arranged in an indoor space R of an architectural structure and is constituted of a flexible sheet material. The air conditioning duct includes: a first duct 10 which is arranged inside in a mode extending along an air blowing direction; and a second duct which is arranged outside around the first duct 10 in a mode extending along the air blowing direction. The first duct 10 is provided with a first inflow port 11 in which air having a prescribed temperature flows from an air conditioner 100 and a first discharge port 12 which discharges the air within the first duct 10 to the indoor space R. The second duct 20 is provided with a second inflow port 21 in which the air having the prescribed temperature flows from the air conditioner 100 and a second discharge port 22 which discharges the air within the second duct 20 to the indoor space R.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to an air conditioning duct that is arranged in an indoor space of a building and is made of a flexible sheet material. [Background technology]

[0002] Conventionally, air conditioning ducts are installed in indoor spaces of buildings such as gymnasiums, evacuation shelters, temporary tents, and huts during disasters, emergencies, events, etc. This air conditioning duct is made of a flexible sheet material, and air blown out from an air conditioner flows in from a base end, flows inside the duct, and is then discharged from the periphery of the duct. This makes it possible to supply air not only to positions in the vicinity of the air conditioner in the indoor space, but also to various positions away from the air conditioner (see, for example, Patent Documents 1 to 3). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-148345 [Patent Document 2] Japanese Patent Application Publication No. 8-294339 [Patent Document 3] Japanese Utility Model Application Publication No. 62-43231 Summary of the Invention [Problem to be solved by the invention]

[0004] However, while conventional air conditioning ducts are fine for the purpose of simply supplying room temperature air to the indoor space of a building, when supplying air of a specified temperature, such as cold or warm air blown out from an air conditioner, to an indoor space, the air of the specified temperature absorbs heat from the indoor space or radiates heat to the indoor space as it flows through the duct, and therefore, when it is discharged from the peripheral surface of the tip or center of the duct, it becomes the same temperature as or close to the temperature of the indoor space, making it difficult to efficiently supply air of the specified temperature from the air conditioner to the indoor space of a building.

[0005] The present invention has been made in consideration of the above-mentioned problems, and has an object to provide an air conditioning duct that can efficiently supply air at a specified temperature produced by an air conditioner to the indoor space of a building. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the present invention provides an air conditioning duct that is arranged in the indoor space of a building and is made of a flexible sheet material, comprising a first duct arranged on the inside in a manner extending along the air blowing direction, and a second duct arranged on the outside around the first duct in a manner extending along the air blowing direction, the first duct having a first inlet through which air at a predetermined temperature from an air conditioner flows in and a first outlet through which the air in the first duct is discharged into the indoor space of the building, and is configured to expand into a cylindrical shape by the air flowing through the first duct, and the second duct having a second inlet through which air at a predetermined temperature from the air conditioner flows in, and is configured to expand into a cylindrical shape by the air flowing through the second duct.

[0007] According to this, the air layer in the first duct is insulated by being surrounded by the air layer in the second duct, so that the air at a predetermined temperature that flows from the air conditioner into the first duct passes through the first duct while roughly maintaining the predetermined temperature, and is then discharged into the indoor space from the first outlet. This makes it possible to efficiently supply air at a predetermined temperature from the air conditioner to the indoor space of the building.

[0008] The first duct may be provided on a circumferential surface thereof such that the first outlets penetrate the second duct in a radial direction, whereby air at a predetermined temperature in the first duct can be discharged in a radial direction from one or more outlets on the circumferential surface of the first duct toward an indoor space of a building.

[0009] The second duct may be provided with a second outlet port for discharging the air in the second duct into the indoor space of the building. In this manner, the air that has flowed into the second duct can also be discharged from the second outlet port into the indoor space of the building.

[0010] The first duct and the second duct may be provided in a position where the second outlet is relatively closer to the air conditioner than the first outlet. With this, the air at a predetermined temperature that has flowed into the second duct is discharged from the second outlet while roughly maintaining the temperature at which it was blown out from the air conditioner, so that the air at the predetermined temperature by the air conditioner can be more efficiently supplied to the indoor space of the building.

[0011] The first duct and / or the second duct may be provided with an openable and closable fastener for discharging air from the duct at the tip end opposite the air conditioner. By opening the fastener within a predetermined range, the air in the air conditioning duct can be released into the indoor space of the building, making it possible to adjust the expansion degree of the air conditioning duct and prevent condensation.

[0012] Furthermore, the first duct and / or the second duct may be provided with a wire member on the periphery of the first inlet and / or the second inlet, which allows the first duct and the second duct of the air conditioning duct to be easily and reliably connected to the air outlet or adapter of the air conditioner.

[0013] Also, the air conditioner may include a cylindrical third duct arranged outside the periphery of the second duct along the air blowing direction, the third duct having an intake port for drawing in air from the indoor space of the building and an exhaust port for discharging the air in the third duct to the air conditioner, and expanding into a cylindrical shape by the air flowing through the third duct. According to this, heat exchange is performed between the air from the indoor space flowing in the reverse direction through the third duct and the air from the air conditioner flowing in the forward direction through the second duct, so that the temperature difference between the air drawn from the third duct into the air conditioner and the air blown out from the air conditioner to the first duct and the second duct can be reduced, and the air heat exchange in the air conditioner can be efficiently performed.

[0014] The present invention also provides an air conditioner set comprising the above-described air conditioning duct and an air conditioner. Effect of the Invention

[0015] According to the present invention, the air layer in the first duct is insulated by being surrounded by the air layer in the second duct, so that the air at a predetermined temperature that flows from the air conditioner into the first duct passes through the first duct while roughly maintaining the predetermined temperature, and is then discharged from the first outlet into the indoor space. This makes it possible to efficiently supply air at a predetermined temperature from the air conditioner to the indoor space of the building.

[0016] This makes it possible to easily install air conditioning ducts in the indoor spaces of buildings such as gymnasiums, evacuation shelters, and temporary tents during disasters, emergencies, or events, and to create comfortable indoor spaces even on hot or cold days. [Brief description of the drawings]

[0017] [Figure 1] 1 is a diagram showing a state in which an air conditioning duct according to a first embodiment of the present invention is installed in an indoor space. [Diagram 2] FIG. 2 is a perspective view showing the air conditioning duct and the air conditioner shown in FIG. [Diagram 3]FIG. 3 is a cross-sectional side view showing the air conditioning duct of FIG. 2. [Figure 4] FIG. 3 is a cross-sectional plan view showing the air conditioning duct of FIG. 2. [Diagram 5] 5A is a cross-sectional view taken along line AA of the air conditioning duct in FIG. 4, and FIG. 5B is a cross-sectional view taken along line BB of the air conditioning duct in FIG. [Figure 6] FIG. 6 is a side cross-sectional view showing an air conditioning duct according to a second embodiment of the present invention. [Figure 7] FIG. 7 is a cross-sectional plan view showing the air conditioning duct of FIG. 6. [Figure 8] 8 is a cross-sectional view of the air conditioning duct of FIG. 7 taken along line CC. [Figure 9] 8 is a cross-sectional view of the air conditioning duct of FIG. 7 taken along line DD. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] <First embodiment> Next, a first embodiment of an air conditioning duct 1 according to the present invention will be described with reference to FIGS.

[0019] 1, this air conditioning duct 1 is installed at a predetermined height from the floor surface and has a length of about 30 m along the horizontal direction in an indoor space R of a building such as a gymnasium, evacuation shelter, temporary tent, or hut, and is connected to an air conditioner 100 to supply air at a predetermined temperature (cold air in this embodiment) to the indoor space R of the building. Note that when installing this air conditioning duct 1, it may be simply connected to the air conditioner 100, or it may be hung from the ceiling, placed directly on the floor surface, or supported by a support member installed on the floor surface.

[0020] The air conditioner 100 is generally separated into an indoor unit 101 and an outdoor unit 102, and the indoor unit 101 blows out cool air at a predetermined temperature from an air outlet 101a and draws in air from the indoor space R from an air inlet 101b, and sends a gas medium that has absorbed heat in the indoor unit 101 to the outdoor unit 102 and sends a gas medium that has released heat in the outdoor unit 102 to the indoor unit 101. Note that the air conditioner 100 may be one in which the functions of the indoor unit 101 and the outdoor unit 102 are integrated.

[0021] The air conditioner 100 is provided with a blow-out side adapter 200 at the blow-out port 101a from which cool air at a predetermined temperature is blown out. As shown in Fig. 3, the blow-out side adapter 200 includes a first cylindrical portion 201 disposed inside the base frame and a second cylindrical portion 202 disposed outside the periphery of the first cylindrical portion 201, and air at a predetermined temperature is blown out from the blow-out port 101a of the air conditioner 100 through the first cylindrical portion 201 and the second cylindrical portion 202 into the inside of the air conditioning duct 1.

[0022] Next, the configuration of the air conditioning duct 1 will be specifically described.

[0023] As shown in Figures 3 and 4, the air conditioning duct 1 is made of a foldable, flexible, bag-shaped sheet material, and comprises a cylindrical first duct 10 with a bottom that is arranged on the inside along the blowing direction of cold air (horizontal in this embodiment), and a cylindrical second duct 20 with a bottom that is arranged on the outside around the first duct 10 along the blowing direction of cold air, and is configured as a two-layer structure consisting of a cylindrical first air layer K1 in the first duct 10 and a cylindrical second air layer K2 in the second duct 20 (air layer between the first duct 10 and the second duct 20).

[0024] 4, the first duct 10 is arranged coaxially inside the second duct 20, and is provided with a first inlet 11 formed on the end face of the base end and a plurality of first outlets 12 formed on the circumferential surface from the tip to the center, and the end face of the tip is formed in a closed state, and is expanded into a cylindrical shape in a manner extending in the air blowing direction by the cool air flowing in the forward direction inside the first duct 10. Note that the first duct 10 is evenly supported from the periphery by the second air layer K2 inside the second duct 20, and is naturally arranged coaxially with the second duct 20.

[0025] The first inlet 11 is fitted into a first cylindrical portion 201 of the outlet side adapter 200 of the air conditioner 100, and the cold air blown out from the first cylindrical portion 201 flows into the first duct 10 from the first inlet 11.

[0026] The first discharge ports 12 are provided symmetrically on the left and right sides of the circumferential surface of the first duct 10 in a front view along the air blowing direction, and discharge the cool air flowing in the forward direction inside the first duct 10 diagonally downward in the radial direction. The first discharge ports 12 penetrate the second duct 20 so as to communicate the inside of the first duct 10 with the indoor space R, and are formed in a truncated cone shape protruding from the circumferential surface of the second duct 20.

[0027] As shown in FIG. 4, the second duct 20 is arranged coaxially with the first duct 10 so as to cover the entire circumference thereof, and is provided with a second inlet 21 formed on the end face of the base end and a plurality of second outlets 22 formed on the circumferential surface from the base end to the central portion, and the end face of the tip end is formed in a closed state. The second duct 20 is expanded cylindrically in a manner extending in the air blowing direction by the cold air flowing in the forward direction inside the second duct 20.

[0028] The second inlet 21 is fitted into the second cylindrical portion 202 of the outlet side adapter 200 of the air conditioner 100, and the cold air blown out from the second cylindrical portion 202 flows into the second duct 20 from the second inlet 21.

[0029] The second discharge ports 22 are provided symmetrically on the left and right sides of the circumferential surface of the second duct 20 in a front view along the air blowing direction, and discharge the cool air flowing in the forward direction inside the second duct 20 diagonally downward. The second discharge ports 22 are formed in a truncated cone shape protruding from the circumferential surface of the second duct 20 so as to communicate the inside of the second duct 20 with the indoor space R.

[0030] 4, the first duct 10 and the second duct 20 are provided in a position where the second outlet 22 is relatively farther away from the air conditioner 100 than the first outlet 12. As a result, the cool air that has flowed into the second duct 20 is discharged from the second outlet 22 while roughly maintaining the temperature at which it was blown out from the air conditioner 100, so that air at a predetermined temperature by the air conditioner 100 can be more efficiently supplied to the indoor space R of the building.

[0031] 2, the first duct 10 and the second duct 20 are provided with annular first fastener portion 13 and second fastener portion 23 on the periphery of the tip portion on the opposite side to the air conditioner 100. Therefore, by opening the first fastener portion 13 and the second fastener portion 23 of the duct within a predetermined range, the air inside the air conditioning duct 1 can be released into the indoor space R of the building, making it possible to adjust the degree of expansion of the air conditioning duct 1 and prevent condensation.

[0032] Furthermore, the first duct 10 and the second duct 20 may be provided with annular wire members (not shown) on the peripheries of the first inlet 11 and the second inlet 21. This makes it possible to easily and reliably connect the first duct 10 and the second duct 20 of the air conditioning duct 1 to the first cylindrical portion 201 and the second cylindrical portion 202 of the air conditioning duct 1 and the air conditioning duct 200 when connecting the air conditioning duct 1 and the air blow-out side adapter 200.

[0033] Next, the material of the air conditioning duct 1 will be specifically described.

[0034] The air conditioning duct 1 is preferably made of a foldable flexible sheet made of polyester fiber as the material of the sheet material. For example, a plain weave of polyester fiber threads with a warp density and weft density of 50 to 300 threads / inch is used. The sheet material has a basis weight of 20 g / m2 so that it is lightweight enough to be deformed by the wind pressure of the cold air from the air conditioner 100, and has strength against the wind pressure of the cold air and pulling during installation. 2 ~100g / m 2 It is preferable that the thickness of the sheet material is within a range of 0.05 mm to 0.25 mm in order to improve ease of handling during installation of the air conditioning duct 1. It is also preferable that the tensile strength of the sheet material is 80 MPa or more and the tensile elongation of the sheet material is 10% or more.

[0035] In addition, the present air conditioning duct 1 has a ventilation rate of 0.01 to 0.05 cm2 as long as it can expand into a cylindrical shape by receiving the wind pressure of the cold air from the air conditioner 100. 3 / cm 2 / s, this can prevent the sheet material from being damaged by excessive force applied to it by the wind pressure of the cold air, and can also prevent condensation from forming on the surface of the sheet material.

[0036] The air conditioning duct 1 may be coated with a thermosetting resin, such as a polyurethane resin, a silicone resin, or a polyvinyl chloride resin, that contains a flame retardant. The amount of the thermosetting resin that contains the flame retardant applied is 1 to 20 g / m2 so that the sheet material exhibits flame retardancy and the thickness and weight of the sheet material do not become excessively large. 2 is preferred.

[0037] Next, a specific description will be given of the flow of cool air in the air conditioning duct 1. The air conditioning duct 1 is connected to the air outlet 101a of the air conditioner 100.

[0038] First, when cold air of a predetermined temperature is blown out from the air outlet 101a of the air conditioner 100, the cold air passes through the first cylindrical portion 201 and the second cylindrical portion 202 of the outlet side adapter 200 and flows into the first duct 10 and the second duct 20 from the first inlet 11 and the second inlet 21, as shown in Figures 3 and 4. At this time, the first duct 10 and the second duct 20 of the air conditioning duct 1 are in a state where they are expanded cylindrically along the air blowing direction due to the pressure of the cold air blown out from the air outlet 101a of the air conditioner 100.

[0039] The cool air that has flowed into the first duct 10 flows in the forward direction from the base end to near the tip end in the first duct 10, and is discharged from each of the first outlets 12 on the circumferential surface of the first duct 10 obliquely downward in the radial direction into the indoor space R, as shown in Fig. 5(a). At this time, the air layer K1 in the first duct 10 is in an insulated state or a state close to an insulated state because it is surrounded by the air layer K2 in the second duct 20. Therefore, the cool air that has flowed into the first duct 10 from the air conditioner 100 is discharged from each of the first outlets 12 in the process of flowing from the center to the tip end of the first duct 10 while roughly maintaining the predetermined temperature at which it was blown out from the air conditioner 100.

[0040] On the other hand, the cold air that has flowed into the second duct 20 flows in the second duct 20 in the forward direction from the base end to the center, and is discharged from each second outlet 22 into the indoor space R, as shown in FIG. 5(b). At this time, the air layer K2 in the second duct 20 is in a state close to the air in the indoor space R, but since the second outlet 22 is disposed in a position close to the air conditioner 100, the cold air that has flowed into the second duct 20 from the air conditioner 100 is discharged from each second outlet 22 in the process of flowing from the base end to the center in the second duct 20 while roughly maintaining the temperature when it was blown out from the air conditioner 100. Note that a part of the cold air that has flowed into the second duct 20 passes the second outlet 22 and remains between the center and the tip of the second duct 20, thereby maintaining the thermal insulation state of the first duct 10.

[0041] Thus, a portion of the cool air blown out from the air conditioner 100 is discharged through the first duct 10 at a position away from the air conditioner 100 while maintaining a predetermined temperature, and a portion of the air is discharged through the second duct 20 at a position closer to the air conditioner 100 while maintaining a predetermined temperature, so that air at a predetermined temperature by the air conditioner 100 can be efficiently supplied to the indoor space R of the building.

[0042] In this embodiment, the air conditioning duct 1 has a two-layer structure made up of the first duct 10 and the second duct 20, but may have a three or more layer structure.

[0043] In addition, the second duct 20 is provided with the second outlet 22 through which the cold air in the second duct 20 is discharged, but the second duct 20 may be configured so that the cold air flowing in from the second inlet 21 stagnates in the second duct 20 without providing the second outlet 22.

[0044] In addition, the first duct 10 and the second duct 20 are connected to the air outlet 101a of the air conditioner 100 via the adapter 200, but they may be directly connected to the air outlet 101a of the air conditioner 100, or may be connected to the air outlet 101a of the air conditioner 100 via a hose or the like.

[0045] In addition, the first duct 10 and the second duct 20 are formed in a truncated conical cylindrical shape with the first outlet 12 and the second outlet 22 protruding from the circumferential surface of the second duct 20, but as long as they connect the inside of the first duct 10 and the second duct 20 to the indoor space R of the building, they do not need to protrude from the circumferential surface of the second duct 20 or may be formed in other shapes.

[0046] In addition, the second duct 20 is arranged coaxially with the first duct 10 so as to cover the entire circumference thereof, but may be arranged so as to cover a part of the circumference of the first duct 10. However, in order to reliably maintain the heat-insulated state of the first duct 10, it is preferable to cover 80% or more of the circumference of the first duct 10.

[0047] <Second embodiment> Next, a second embodiment of the air conditioning duct 1 according to the present invention will be described with reference to Figures 6 to 9. Note that only configurations different from the above embodiment will be described below, and the same configurations will be denoted by the same reference numerals and explanations will be omitted.

[0048] As shown in Figures 6 and 7, this air conditioning duct 1 has a bottomed, cylindrical third duct 30 that is arranged outside the periphery of the second duct 20 along the air blowing direction, and is configured in a three-layer structure consisting of a cylindrical first air layer K1 in the first duct 10, an annular second air layer K2 (air layer between the first duct 10 and the second duct 20) in the second duct 20, and a cylindrical third air layer K3 in the third duct 30 (air layer between the second duct 20 and the third duct 30).

[0049] As shown in FIG. 7, this third duct 30 is arranged coaxially with the second duct 20 in a manner that covers the entire circumference, and is provided with a cylindrical suction port 31 formed on the lower peripheral surface of the tip end and a cylindrical exhaust port 32 formed on the lower peripheral surface of the base end, with the end face of the tip end being formed in a closed state and expanded cylindrically in a manner that extends in the blowing direction (horizontal direction) due to air flowing in the reverse direction within the third duct 30.

[0050] The suction port 31 is formed in a manner to face downward into the third duct 30 , and air in the indoor space R is sucked into the third duct 30 through the suction port 31 .

[0051] The exhaust outlet 32 ​​is formed in a manner that faces downward into the third duct 30, and is connected to the air conditioner 100 and has one end of a suction hose 400 fitted thereto, so that air flowing in the reverse direction through the third duct 30 is discharged from the exhaust outlet 32 ​​into the suction hose 400.

[0052] 6, the air conditioner 100 is provided with an suction side adaptor 300 at the suction port 101b through which air from the indoor space R is drawn in. The other end of the suction hose 400 of the suction side adaptor 300 is connected to a cylindrical portion, and the suction side adaptor 300 draws in the air from the indoor space R that flows in from the suction hose 400 through the cylindrical portion.

[0053] In this embodiment, the first outlet 12 of the first duct 10 is formed in a truncated cone shape that penetrates the second duct 20 and the third duct 30 so as to communicate the inside of the first duct 10 with the indoor space R and protrudes from the circumferential surface of the third duct 30, as shown in Fig. 8. The second outlet 22 of the second duct 20 is formed in a truncated cone shape that penetrates the third duct 30 so as to communicate the inside of the second duct 20 with the indoor space R and protrudes from the circumferential surface of the third duct 30, as shown in Fig. 9.

[0054] 6, the air in the indoor space R is sucked into the third duct 30 from the suction port 31, flows in the third duct 30 in the reverse direction from the tip to the base, and is then discharged from the exhaust port 32 to the suction hose 400, and is sucked into the suction port 101b of the air conditioner 100 through the suction hose 400. At this time, heat exchange occurs between the air from the indoor space R flowing in the reverse direction in the third duct 30 (third air layer K3) and the air from the air conditioner 100 flowing in the forward direction in the second duct 20 (second air layer K2). This makes it possible to reduce the temperature difference between the air sucked into the suction port 101b of the air conditioner 100 from the third duct 30 and the air (cold air) blown out from the air outlet 101a of the air conditioner 100 to the first duct 10 and the second duct 20, and makes it possible to efficiently exchange heat between the air in the air conditioner 100.

[0055] In each of the above embodiments, the air conditioning duct 1 is applied when cool air at a predetermined temperature is blown out from the air conditioner 100, but it may also be applied when warm air at a predetermined temperature is blown out from the air conditioner 100.

[0056] Furthermore, although the present air conditioning duct 1 is configured with one duct in the length direction, a plurality of ducts may be configured in series or parallel in the length direction.

[0057] Although the embodiment of the present invention has been described above with reference to the drawings, the present invention is not limited to the illustrated embodiment. Various modifications and variations can be made to the illustrated embodiment within the same scope as the present invention or within an equivalent scope. [Explanation of symbols]

[0058] 1...Air conditioning duct 10…First duct 11…First inlet 12…First outlet 13…First fastener part 20…Second duct 21…Second inlet 22…Second outlet 23…Second fastener part 30…Third duct 31...Suction port 32…Discharge port 100...Air conditioner 101…Indoor unit 101a...Air outlet 101b…Suction port 102...Outdoor unit 200…Outlet side adapter 201...first cylindrical portion 202...second cylindrical portion 300...Suction side adapter 400…Suction hose K1: First air layer K2: Second air layer K3: The third air layer R…Indoor space

Claims

1. An air conditioning duct arranged in an indoor space of a building and made of a flexible sheet material, The air conditioner includes a first duct disposed on an inner side in a manner extending along an air blowing direction, and a second duct disposed on an outer side around the first duct in a manner extending along the air blowing direction, the first duct is provided with a first inlet through which air at a predetermined temperature from an air conditioner flows in and a first outlet through which the air in the first duct is discharged into an indoor space of a building, and is expanded into a cylindrical shape by the air flowing through the first duct; The second duct is provided with a second inlet through which air at a predetermined temperature from the air conditioner flows in, and is configured to expand into a cylindrical shape due to the air flowing through the second duct.

2. The air conditioning duct according to claim 1 , wherein the first duct is provided on a peripheral surface thereof such that the first outlet port radially penetrates the second duct.

3. The air conditioning duct according to claim 1 , wherein the second duct is provided with a second outlet port for discharging the air in the second duct into an indoor space of a building.

4. The air conditioning duct according to claim 3 , wherein the first duct and the second duct are provided such that the second outlet is relatively closer to the air conditioner than the first outlet.

5. The air conditioning duct according to claim 1 , wherein the first duct and / or the second duct is provided with an openable and closable fastener portion for discharging air within the duct at a tip end on the side opposite to the air conditioner.

6. The air conditioning duct according to claim 1 , wherein the first duct and / or the second duct has a wire member provided on a peripheral edge of the first inlet and / or the second inlet.

7. a cylindrical third duct disposed outside the periphery of the second duct along the air blowing direction; 2. The air conditioning duct as described in claim 1, wherein the third duct is provided with an intake port for drawing in air from the indoor space of the building and an exhaust port for exhausting the air in the third duct to the air conditioner, and is configured to expand into a cylindrical shape by the air flowing through the third duct.

8. An air conditioner set comprising the air conditioning duct according to any one of claims 1 to 7 and an air conditioner.

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