Flexible composite air pipe tee joint assembly and installation method thereof

Abstract

The application discloses a flexible composite air pipe tee joint connecting assembly and a mounting method thereof. The connecting assembly comprises a tee main pipe, at least one tee branch pipe and at least one tee connecting flange. The side wall of the tee main pipe is provided with a closed annular hole, and one end of the tee branch pipe is provided with a curved edge matched with the hole. The tee connecting flange is a flexible annular sheet material, which is bonded to the surface of the tee main pipe, and the inner ring of the tee connecting flange is matched with the closed annular hole in size. The tee connecting flange is provided with a first connecting zipper, and the tee branch pipe is provided with a second connecting zipper along the curved edge, and the two are pulled together to connect the tee main pipe and the tee branch pipe. According to the scheme, the high-difficulty zipper sewing operation originally directly performed at the closed curved position of the tee main pipe is transferred to the prefabrication process of the tee connecting flange and the tee branch pipe, so that the factory prefabrication and the positioning installation on the engineering site are facilitated, the tee processing difficulty is reduced, the on-site construction convenience is improved, and the material waste caused by the straight pipe modification is reduced.

Description

Technical Field

[0001] This invention relates to the field of flexible composite duct technology, specifically to a flexible composite duct tee connection component and its installation method. Background Technology

[0002] Flexible composite ducts are widely used in HVAC, cleanroom, and industrial ventilation systems due to their lightweight, ease of transportation and installation, and good thermal insulation properties. In flexible composite duct systems, the tee structure is used to achieve flow branching or convergence between the main pipe and branch pipes, and is a common and critical connection method in field installation.

[0003] Existing flexible composite duct tees typically use zippers installed at the intersections of the main and branch pipes, with the tee connected by zipping. Since the intersection line between the main and branch pipes is usually a closed curve, especially when this curve is located in the middle of the main pipe material, directly sewing the zipper along this curve requires simultaneous rotation of the main pipe during the sewing process. This method demands significant space, sewing skills, and worker strength, often requiring multiple people to work together, resulting in high processing difficulty and low efficiency. Furthermore, due to the difficulty of on-site fabrication, existing tee structures often require pre-fabrication in the factory. However, discrepancies easily arise between the factory-made tee positions and the on-site installation dimensions. To match the installation position, straight pipes often need to be lengthened or shortened, increasing construction difficulty and potentially wasting materials.

[0004] Therefore, how to reduce the connection and processing difficulty of flexible composite duct tees and improve their adaptability to on-site installation has become a problem that needs to be solved in this field. Summary of the Invention

[0005] The purpose of this application is to overcome the above-mentioned technical deficiencies and propose a flexible composite duct tee connection component and its installation method, thereby solving the technical problems of difficult connection and processing and inconvenient on-site installation of flexible composite duct tee in the prior art.

[0006] To achieve the above-mentioned technical objectives, this application adopts the following technical solution: In a first aspect, this application provides a flexible composite duct tee connection assembly, comprising: The three-way main pipe has a closed annular hole on its side wall; At least one tee branch pipe, one end of which is configured as a curved edge adapted to the closed annular orifice; and At least one tee connecting flange, the tee connecting flange being a flexible annular sheet that is bonded to the surface of the tee main pipe, the inner ring of which is aligned with and sized to fit the closed annular hole, the tee connecting flange being provided with a first connecting zipper, and the tee branch pipe being provided with a second connecting zipper along the curved edge, the first connecting zipper and the second connecting zipper being pulled together to connect the tee main pipe and the tee branch pipe.

[0007] In some embodiments of this application, the intersection line between the tee main pipe and the tee branch pipe is a closed curve, the edge of the closed annular hole is adapted to the closed curve, and the curve edge is adapted to the closed curve.

[0008] In some embodiments of this application, an adhesive layer is provided on the back of the tee connecting flange, and the tee connecting flange is bonded to the surface of the tee main pipe through the adhesive layer.

[0009] In some embodiments of this application, the tee connecting flange and the tee main pipe are further connected by a plurality of reinforcing nails, which are evenly distributed along the circumference of the closed annular hole.

[0010] In some embodiments of this application, the first connecting zipper is sewn and fixed along the inner ring edge of the tee connecting flange.

[0011] In some embodiments of this application, the outer periphery of the connection between the main tee pipe and the branch tee pipe is also covered with thermal insulation tape.

[0012] In some embodiments of this application, there are multiple tee branch pipes and tee connecting flanges, and multiple closed annular holes are provided on the tee main pipe. Each closed annular hole is connected to a tee branch pipe through a tee connecting flange.

[0013] Secondly, this application also provides an installation method for a flexible composite duct tee connection assembly, comprising the following steps: The tee connection flange is bonded and fixed to the preset position of the tee main pipe by adhesive bonding. The tee connection flange is a flexible ring-shaped sheet with a first connection zipper preset in its inner ring. Using the inner ring edge of the tee flange as a reference, the tee main pipe is cut to form a tee connection hole corresponding to the inner ring; Pull the second connecting zipper of the tee branch pipe and the first connecting zipper on the tee connecting flange together to connect the tee main pipe and the tee branch pipe, wherein the second connecting zipper is pre-set on the curved edge of the end of the tee branch pipe.

[0014] In some embodiments of this application, the installation method further includes: Multiple reinforcing nails are passed through the tee connection flange and the tee main pipe to mechanically reinforce both; Insulating tape is adhered to the outer periphery of the connection between the main tee pipe and the branch tee pipe along their intersection line.

[0015] In some embodiments of this application, the installation method further includes a prefabricated tee connection flange and the tee branch pipe: According to the unfolded diagram of the intersecting curves of the tee, cut out the tee connecting flange and the tee branch pipe respectively; The first connecting zipper is sewn and fixed along the inner ring edge of the tee connecting flange, and the second connecting zipper is sewn and fixed along the curved edge of the end of the tee branch pipe. An adhesive layer is applied to the back of the tee flange.

[0016] Compared with the prior art, the beneficial technical effects of the technical solution provided in this application include: This application adds an independent tee connecting flange to the surface of the tee main pipe and pre-installs the first connecting zipper on the tee connecting flange, transforming the previously difficult sewing process, which required direct stitching at the closed curve of the tee main pipe, into a more easily implemented prefabrication process. This facilitates the prefabrication of the tee connecting flange and tee branch pipe in the factory, reducing the processing difficulty of the main pipe body. Furthermore, it allows for on-site installation by bonding and fixing the tee connecting flange to the surface of the tee main pipe according to the actual positioning before drilling holes and completing the connection, thereby improving on-site construction flexibility and reducing straight pipe lengthening / shortening and material waste caused by prefabrication position deviations. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this application, the accompanying drawings used in the embodiments will be briefly described below: Figure 1 This is a schematic diagram of the structure of a flexible composite duct tee connection component in an embodiment of this application; Figure 2 This is a schematic diagram showing the unfolded arrangement of a tee main pipe and a tee connecting flange in an embodiment of this application; Figure 3 This is a schematic diagram of the unfolded form of a three-way branch pipe in an embodiment of this application; Figure 4 This is a flowchart illustrating an installation method according to an embodiment of this application.

[0018] Figure label: 1-Tee main pipe, 11-Closed annular hole, 2-Tee branch pipe, 21-Curved edge, 3-Tee connecting flange, 41-First connecting zipper, 42-Second connecting zipper, 5-Reinforcing nail. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0020] Those skilled in the art will understand that, in this specification, the term "comprising" is an open-ended expression, meaning that the stated feature is present but other features are excluded. Directional terms such as "upper," "lower," "left," and "right" refer to exemplary directions based on the accompanying drawings. Features specified as "first" or "second" implicitly include one or more of that feature. Singular expressions can also be used in plural forms. "Multiple" means two or more. The terms "installed," "connected," and "linked" can refer to a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection via an intermediate medium, and it can be a connection within two components. Furthermore, "linked" can include wireless connections.

[0021] The purpose of this application is to overcome the above-mentioned technical deficiencies and propose a flexible composite duct tee connection component and its installation method, thereby solving the technical problems of difficult connection and processing and inconvenient on-site installation of flexible composite duct tee in the prior art.

[0022] To achieve the above-mentioned technical objectives, this application adopts the following technical solution: This embodiment provides a flexible composite duct tee connection component, such as... Figures 1 to 3 As shown, it includes a tee main pipe 1, at least one tee branch pipe 2, and at least one tee connecting flange 3.

[0023] The tee main pipe 1 is a flexible composite duct main section, and its side wall has a closed annular hole 11. The closed annular hole 11 is set at a predetermined position on the side wall of the main pipe to form a communication opening corresponding to the branch pipe. The closed annular hole 11 can be a closed curved hole determined according to the spatial intersection relationship between the main pipe and the branch pipe, and its specific outline can be determined according to the diameter of the main pipe, the diameter of the branch pipe, and the included angle between the branch pipe and the main pipe.

[0024] The tee branch pipe 2 is a branch duct that connects to the tee main pipe 1. One end of the tee branch pipe 2 is set with a curved edge 21, which is adapted to the closed annular hole 11 so that the end of the branch pipe can correspond to and fit the edge of the opening on the side wall of the main pipe after connection. Here, "adaptation" means that the two correspond to each other in shape and size, so that the tee branch pipe 2 can form a continuous and smooth air duct transition after connection.

[0025] The tee-connecting flange 3 is a flexible annular sheet, preferably made of a composite sheet compatible with flexible composite ducts, to ensure good adaptability during bending, fitting, and sewing. The tee-connecting flange 3 is bonded to the surface of the tee main pipe 1, with its inner ring aligned and sized to the closed annular hole 11. A first connecting zipper 41 is provided on the tee-connecting flange 3, and a second connecting zipper 42 is provided along the curved edge 21 of the tee branch pipe 2. The first connecting zipper 41 and the second connecting zipper 42 are pulled together to achieve an assemblable connection between the tee main pipe 1 and the tee branch pipe 2.

[0026] In this embodiment, the tee connection flange 3 is equivalent to an independent connecting support component located on the outside of the tee main pipe 1. By prefabricating the tee connection flange 3 and its first connecting zipper 41, it is possible to avoid directly sewing the zipper at the closed curve of the tee main pipe 1.

[0027] During installation, first, the tee connecting flange 3 is fitted and fixed to the target position on the surface of the tee main pipe 1, aligning the inner ring with the predetermined opening area. Then, an opening is made in the corresponding area of ​​the inner ring of the tee main pipe 1, forming a closed annular hole 11 that matches the end of the branch pipe. Afterwards, the second connecting zipper 42 at the end of the tee branch pipe 2 is connected to the first connecting zipper 41 on the tee connecting flange 3 and pulled closed, connecting the tee main pipe 1 and the tee branch pipe 2. Since the first connecting zipper 41 is pre-installed on the independent tee connecting flange 3, rather than being directly sewn to the curved position in the middle of the tee main pipe 1, the more difficult sewing process can be completed in the factory prefabrication stage. On-site installation mainly involves positioning, fitting, opening, and pulling. This reduces processing difficulty, improves construction flexibility, and helps reduce on-site straight pipe modification and material waste.

[0028] This embodiment further defines the geometric matching relationship between the tee main pipe 1 and the tee branch pipe 2. The intersection line between the tee main pipe 1 and the tee branch pipe 2 is a closed curve. The edge of the closed annular hole 11 is adapted to this closed curve, and the curved edge 21 is adapted to this closed curve. The closed curve mentioned here can be the unfolded curve corresponding to the theoretical intersection line formed by the outer wall of the main pipe and the outer wall of the branch pipe at a predetermined installation angle.

[0029] Specifically, when the tee branch pipe 2 is connected to the tee main pipe 1 vertically or at an angle, the boundary where the two intersect is usually not a simple circle, but a closed curve. Setting the closed annular hole 11 and the curved edge 21 to be the same shape as the closed curve helps to form a more accurate circumferential correspondence between the end of the tee branch pipe 2 and the edge of the opening of the tee main pipe 1.

[0030] By designing and processing the edges of the closed annular hole 11 and the curved edge 21 based on the same closed curve, the end of the branch pipe can achieve a better geometric match with the edge of the main pipe opening after installation, reducing local suspension, wrinkles, or misalignment, and making the stress and sealing at the connection more uniform. This improves the consistency of the connection profile and helps to enhance the fit and assembly accuracy of the tee connection.

[0031] This embodiment further defines the adhesive structure of the tee connecting flange 3. An adhesive layer is provided on the back of the tee connecting flange 3, which is bonded to the surface of the tee main pipe 1 via the adhesive layer; this layer can be the inner or outer surface. The adhesive layer can be a pre-coated adhesive layer applied to the back of the tee connecting flange 3, or it can be an adhesive layer applied before installation. In a preferred embodiment, the tee connecting flange 3 adopts an adhesive-backed structure, facilitating transportation, storage, and rapid on-site installation.

[0032] To ensure a good fit, the adhesive layer can be continuously applied to the back of the tee flange 3, or it can be applied in sections without affecting the bonding strength and sealing performance. The outer surface of the tee main pipe 1 can be dusted, leveled, or compacted before bonding to improve bonding stability.

[0033] By applying an adhesive layer to the back of the tee flange 3, the tee flange 3 can be quickly positioned and attached to the surface of the tee main pipe 1, ensuring its stable position during subsequent opening and zipper connection processes. The adhesive structure provides both initial fixation and a certain sealing foundation for the connection area.

[0034] This embodiment further defines the reinforcement method between the tee connecting flange 3 and the tee main pipe 1. The tee connecting flange 3 and the tee main pipe 1 are also connected by multiple reinforcing nails 5, which are evenly distributed circumferentially along the closed annular hole 11. The reinforcing nails 5 are preferably plastic nails. Plastic nails have good compatibility with flexible composite duct materials and are less likely to cause excessive cutting damage to the flexible material. Multiple reinforcing nails 5 can pass through the tee connecting flange 3 and the tee main pipe 1 to achieve mechanical reinforcement between them.

[0035] In some embodiments, the reinforcing nails 5 can be installed after the tee flange 3 is bonded and fixed. The reinforcing nails 5 are distributed close to the inner circumferential area of ​​the tee flange 3 to provide support for the connection area near the edge of the intersecting hole. According to the instructions, the spacing between adjacent reinforcing nails 5 can be controlled within the range of 50 to 500 mm to balance the reinforcement effect and construction convenience.

[0036] The tee flange 3 is first bonded to the tee main pipe 1 with an adhesive layer, and then mechanically fixed circumferentially with multiple reinforcing nails 5. In this way, the adhesive method provides surface contact fixation, while the mechanical reinforcement method provides local anti-peeling and anti-displacement capabilities. The combination of the two makes the connection between the flange and the main pipe more stable.

[0037] This embodiment further defines the arrangement of the first connecting zipper 41. The first connecting zipper 41 is sewn and fixed along the inner ring edge of the tee connecting flange 3. Preferably, the first connecting zipper 41 is continuously arranged along the circumference of the inner ring so that it is consistent with the contour of the inner ring. The sewing stitch can extend along the edge of the zipper tape to ensure sufficient connection strength between the zipper and the tee connecting flange 3.

[0038] The first connecting zipper 41 is located on the tee connecting flange 3 instead of directly on the curved part of the tee main pipe 1. Since the tee connecting flange 3 is a separate sheet material when sewing, it is easier to operate than directly sewing the curved part of the main pipe surface.

[0039] The first connecting zipper 41, pre-sewn onto the inner ring edge of the tee connecting flange 3, can directly mate with the second connecting zipper 42 on the tee branch pipe 2 during subsequent installation. The sewing work is transferred to a separate sheet, reducing the need for complex rotary sewing on large, flexible pipe bodies.

[0040] This embodiment further defines the external sealing and insulation structure at the connection. The outer periphery of the connection between the tee main pipe 1 and the tee branch pipe 2 is also covered with insulating tape. The insulating tape is applied along the intersection line of the tee main pipe 1 and the tee branch pipe 2 or its adjacent area to provide external sealing and insulation for the connection. The insulating tape can be a flexible insulating sealing tape to adapt to the curved contour of the tee connection.

[0041] After installation, continuously apply insulation tape along the circumference of the connection, covering the area near the outer edge of the tee flange 3, the area near the edge of the opening of the tee main pipe 1, and the area near the end of the tee branch pipe 2. If necessary, segmented overlapping can be used to complete the wrapping.

[0042] By adding thermal insulation tape to the outer periphery of the connection between the tee main pipe 1 and the tee branch pipe 2, the connection gaps and exposed areas of the connecting components can be covered, thereby improving the sealing of the connection and isolating local heat exchange, reducing the problem of weak insulation caused by structural changes in the connection part.

[0043] This embodiment further defines the form of multi-branch pipe connection. There are multiple tee branch pipes 2 and tee connecting flanges 3. Multiple closed annular holes 11 are provided on the tee main pipe 1, and each closed annular hole 11 is connected to a tee branch pipe 2 through a tee connecting flange 3. The multiple closed annular holes 11 can be spaced apart along the length of the tee main pipe 1 or staggered circumferentially; the specific positions can be determined according to the branching requirements on site.

[0044] In this embodiment, each set of tee branch pipes 2 and tee connecting flanges 3 can be prefabricated and installed as separate connection units. Sufficient structural spacing should be maintained between each closed annular hole 11 to avoid mutual interference between adjacent connection areas. Multiple tee branch pipes 2 can have the same specifications, or different specifications can be used according to actual air supply and exhaust requirements.

[0045] By setting multiple closed annular holes 11, multiple tee connecting flanges 3, and multiple tee branch pipes 2 on the same tee main pipe 1, multiple branch connections can be completed in a modular manner. Each connection unit is achieved by "flange fitting - main pipe opening - zipper connection", which facilitates individual positioning and installation.

[0046] This embodiment provides an installation method for a flexible composite duct tee connection assembly, such as... Figure 4 As shown, it includes the following steps: Step S1: The tee connecting flange 3 is bonded and fixed to the preset position of the tee main pipe 1 by adhesive bonding. The tee connecting flange 3 is a flexible ring-shaped sheet with a first connecting zipper 41 preset on its inner ring.

[0047] Step S2: Using the inner ring edge of the tee flange 3 as a reference, the tee main pipe 1 is cut to form a tee connection hole corresponding to the inner ring. This tee connection hole is a closed annular hole 11 in the actual structure.

[0048] Step S3: Pull the second connecting zipper 42 of the tee branch pipe 2 and the first connecting zipper 41 on the tee connecting flange 3 together to connect the tee main pipe 1 and the tee branch pipe 2. The second connecting zipper 42 is pre-set on the curved edge 21 at the end of the tee branch pipe 2.

[0049] In actual installation, the tee connecting flange 3 can be positioned according to the site design location first, and then fitted and fixed. Next, the inner ring is used as the cutting reference to create a hole, ensuring the hole position naturally corresponds to the flange position. Finally, the tee branch pipe 2 is connected to the tee connecting flange 3 using a zipper. This embodiment simplifies the on-site process to flange positioning, main pipe hole creation, and zipper connection, facilitating on-site construction and better adapting to on-site dimensional deviations.

[0050] This embodiment further includes the following: passing multiple reinforcing nails 5 through the tee connection flange 3 and the tee main pipe 1 to mechanically reinforce both; and applying thermal insulation tape along the intersection line at the outer periphery of the connection between the tee main pipe 1 and the tee branch pipe 2.

[0051] Preferably, multiple reinforcing nails 5 can be installed after the tee flange 3 is bonded and fixed, or before or after the tee branch pipe 2 is connected. The reinforcing nails 5 are evenly distributed around the circumference of the tee flange 3. Afterward, thermal insulation tape is applied to the connection to form an external thermal insulation sealing layer.

[0052] Based on the flange bonding and fixing, additional fixing is provided by reinforcing nails 5, and then the connection area is sealed with thermal insulation tape, which can make the connection have both good structural stability and external sealing and thermal insulation effect.

[0053] This embodiment further includes the steps of prefabricating a tee connection flange 3 and a tee branch pipe 2: According to the unfolded diagram of the intersecting curves of the tee, cut out the tee connecting flange 3 and the tee branch pipe 2 respectively; sew the first connecting zipper 41 along the inner ring edge of the tee connecting flange 3 and sew the second connecting zipper 42 along the end curved edge 21 of the tee branch pipe 2; apply an adhesive layer on the reverse side of the tee connecting flange 3.

[0054] The development diagram of the tee intersection curve can be determined based on the structural dimensions and installation angles of the tee main pipe 1 and the tee branch pipe 2. The tee connecting flange 3 is cut to form a closed ring-shaped sheet, the inner ring of which matches the development diagram of the tee intersection curve. The curved edge 21 at the end of the tee branch pipe 2 is also cut according to the corresponding development diagram. By pre-completing the flange cutting, zipper sewing, and adhesive backing in the factory, complex on-site processing procedures can be reduced.

[0055] In this embodiment, the more difficult tasks of curve cutting and zipper sewing are completed in the prefabrication stage. On-site, only the positioning and bonding of the tee connection flange 3, the main pipe opening and the branch pipe zipper assembly are required, thereby realizing the division of labor between prefabrication and on-site installation.

[0056] The tee flange 3 is preferably a closed-ring sheet, the width of which can be set to 20-200mm. The flange width refers to the radial dimension between the outer edge and the inner ring of the tee flange 3. In smaller ducts, the flange width can be smaller to reduce material usage and maintain flexibility; in larger ducts or when a larger bonding area is required, the flange width can be appropriately increased to improve bonding and reinforcement space.

[0057] Multiple reinforcing studs 5 are evenly arranged circumferentially along the inner ring of the tee connection flange 3, and the spacing between adjacent reinforcing studs 5 is preferably controlled between 50 and 500 mm. For tee connections with smaller diameters, a smaller spacing can be used to improve edge stability; for tee connections with larger diameters and higher material strength, a larger spacing can be used to reduce the amount of construction work.

[0058] During installation, the closed annular hole 11 on the tee main pipe 1 is preferably cut and formed after the tee connecting flange 3 is fitted and fixed. That is, the connection position of the main pipe side wall is first located using the tee connecting flange 3, and then the tee connecting hole is formed with the inner ring edge as the cutting reference.

[0059] The tee connection flange 3 can include, from the inside out, a base layer bonded to the tee main pipe 1, a reinforcing layer disposed on the base layer, and a zipper mounting area located outside the reinforcing layer. The first connecting zipper 41 is sewn into the zipper mounting area. The base layer can be a flexible composite sheet material adapted to the flexible composite duct, and the reinforcing layer can be a locally thickened layer or a fiber reinforcing layer. The zipper mounting area is arranged along the inner ring edge.

[0060] Before the formal bonding of the tee connection flange 3, the tee connection flange 3 can be pre-attached to the outer surface of the tee main pipe 1 according to the tee positioning position determined at the project site, and the position can be checked. After the position check is completed, the formal bonding and fixing, main pipe opening, branch pipe connection and external insulation treatment can be carried out.

[0061] Compared with the prior art, the beneficial technical effects of the technical solution provided in this application include: This application shifts the complex zipper sewing process, originally required at the intricate closed curve of the tee main pipe 1, to the prefabrication stage of the tee connecting flange 3 and tee branch pipe 2. This allows for the completion of more difficult processing steps in the factory, reducing on-site processing difficulty. On-site installation mainly involves positioning, flange application, main pipe opening, and zipper connection. The construction process is clearer, better adaptable to on-site positioning deviations, reduces the need for straight pipe lengthening and shortening, improves construction convenience, and helps reduce material waste.

[0062] Those skilled in the art will understand that the steps, measures, and schemes in the various operations, methods, processes, and procedures discussed in this application can be alternated, modified, rearranged, decomposed, combined, or deleted.

[0063] The specific embodiments described above do not constitute a limitation on the scope of protection of this application. Any other corresponding changes and modifications made based on the technical concept of this application should be included within the scope of protection of the claims of this application.

Claims

1. A flexible composite duct tee connection assembly, characterized in that, include: The three-way main pipe has a closed annular hole on its side wall; At least one tee branch pipe, one end of which is configured as a curved edge adapted to the closed annular hole; as well as At least one tee connecting flange, the tee connecting flange being a flexible annular sheet, which is bonded to the surface of the tee main pipe, with its inner ring aligned with and sized to fit the closed annular hole, the tee connecting flange being provided with a first connecting zipper, and the tee branch pipe being provided with a second connecting zipper along the curved edge, the first connecting zipper and the second connecting zipper being pulled together to connect the tee main pipe and the tee branch pipe.

2. The flexible composite duct tee connection assembly according to claim 1, characterized in that, The intersection line between the main tee pipe and the branch tee pipe is a closed curve, the edge of the closed annular hole is adapted to the closed curve, and the curve edge is adapted to the closed curve.

3. The flexible composite duct tee connection assembly according to claim 1, characterized in that, The back of the tee flange is provided with an adhesive layer, and the tee flange is bonded to the surface of the tee main pipe through the adhesive layer.

4. The flexible composite duct tee connection assembly according to claim 1, characterized in that, The tee flange and the tee main pipe are also connected by multiple reinforcing studs, which are evenly distributed along the circumference of the closed annular hole.

5. The flexible composite duct tee connection assembly according to claim 1, characterized in that, The first connecting zipper is sewn and fixed along the inner ring edge of the tee connecting flange.

6. The flexible composite duct tee connection assembly according to claim 1, characterized in that, The outer periphery of the connection between the main tee pipe and the branch tee pipe is also covered with thermal insulation tape.

7. The flexible composite duct tee connection assembly according to claim 1, characterized in that, The number of the tee branch pipes and the tee connecting flanges is multiple. The tee main pipe has multiple closed annular holes, and each closed annular hole is connected to a tee branch pipe through a tee connecting flange.

8. An installation method for a flexible composite duct tee connection assembly, characterized in that, Includes the following steps: The tee connection flange is bonded and fixed to the preset position of the tee main pipe by adhesive bonding. The tee connection flange is a flexible ring-shaped sheet with a first connection zipper preset in its inner ring. Using the inner ring edge of the tee flange as a reference, the tee main pipe is cut to form a tee connection hole corresponding to the inner ring; Pull the second connecting zipper of the tee branch pipe and the first connecting zipper on the tee connecting flange together to connect the tee main pipe and the tee branch pipe, wherein the second connecting zipper is pre-set on the curved edge of the end of the tee branch pipe.

9. The installation method of the flexible composite duct tee connection assembly according to claim 8, characterized in that, The installation method further includes: Multiple reinforcing nails are passed through the tee connection flange and the tee main pipe to mechanically reinforce both; Insulating tape is adhered to the outer periphery of the connection between the main tee pipe and the branch tee pipe along their intersection line.

10. The installation method of the flexible composite duct tee connection assembly according to claim 8, characterized in that, The installation method also includes a prefabricated tee connection flange and the tee branch pipe: According to the unfolded diagram of the intersecting curves of the tee, cut out the tee connecting flange and the tee branch pipe respectively; The first connecting zipper is sewn and fixed along the inner ring edge of the tee connecting flange, and the second connecting zipper is sewn and fixed along the curved edge of the end of the tee branch pipe. An adhesive layer is applied to the back of the tee flange.

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