Integral non-combustible A-level flexible heat preservation air pipe

Abstract

The invention relates to the technical field of ventilation equipment, in particular to an integral non-combustible A-level flexible heat preservation air duct which comprises an outer layer, a middle layer and an inner layer, clamping rings are installed at the head and tail of an inner ring of the inner layer, limiting rings are installed on the inner ring of the inner layer in an array mode, locking mechanisms are installed at the limiting rings, and a spring framework is installed between the middle layer and the outer layer. The outer layer is divided into a connecting end and a sealing cover end, a sealing mechanism is installed at the connecting end, when the head clamping ring and the tail clamping ring are close to each other, the locking mechanism drives the spring framework to be unfolded, the connecting end is magnetically attracted through the locking mechanism, and the sealing mechanism seals the adjacent connecting end under the action of the locking mechanism. And in the installation process, sealing treatment can be synchronously conducted on the connecting position, then the sealing effect is improved, meanwhile, the manual installation time is saved, and building energy saving is achieved.

Description

Technical Field

[0001] This invention relates to the field of ventilation equipment technology, specifically to an integral non-combustible Class A flexible insulated air duct. Background Technology

[0002] The overall non-combustible Class A flexible insulated air duct is a ventilation duct system that meets the highest fire protection requirements for buildings. It combines flexibility and thermal insulation performance and is mainly used in scenarios with high requirements for fire protection and installation flexibility, such as smoke control and exhaust systems and air conditioning ventilation.

[0003] In HVAC systems, air ducts are the core components for transporting and distributing air. Air ducts are mainly divided into rigid and flexible ducts. While rigid ducts have high strength, they are typically complex to manufacture and install. Therefore, flexible ducts are more widely used due to their lightweight and flexibility. However, existing flexible duct technology struggles to meet high fire safety requirements. Although some duct materials can achieve B1 flame retardancy, they are still inherently combustible and cannot meet high-level fire safety standards. Consequently, flexible ducts are difficult to widely apply in locations with stringent fire safety requirements.

[0004] At the installation and connection level, the installation efficiency of existing flexible ducts is low. During transportation and storage, the ducts are usually folded into short sections. During on-site installation, construction workers need to manually stretch and unfold them along their length. This process is not only time-consuming, but also makes it difficult to ensure that the unfolded duct is straight and free of twisting. More importantly, in order to meet the requirements of non-combustible rating, composite ducts are usually used. On the one hand, their structure is complex and bulky, and on the other hand, the connection between duct sections usually relies on tape wrapping and metal clamp locking. At this time, it is difficult to ensure the firmness and sealing of the connection, thereby reducing the operating efficiency of the entire ventilation duct and increasing energy consumption.

[0005] When using traditional tape and hose clamp connections, the sealing performance deteriorates over time. Tape may age and delaminate due to temperature and humidity changes, and hose clamps may loosen due to vibration. These factors can lead to seal failure and persistent ventilation leaks. Furthermore, the tape and other auxiliary materials used at the joints further reduce their fire resistance, thus posing a fire safety hazard to the entire piping system.

[0006] Based on this, in order to solve the problem that it is difficult to balance convenient disassembly and airtightness when using insulated air ducts, this invention designs an integral non-combustible Class A flexible insulated air duct. Summary of the Invention

[0007] This invention provides an integral non-combustible Class A flexible thermal insulation duct that solves the problem of balancing convenient disassembly and airtightness when using thermal insulation ducts. It achieves quick disassembly and assembly through magnetic adsorption unlocking, while simultaneously sealing the joints during installation. This improves the sealing effect, saves manual installation time, and achieves building energy conservation.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] This invention provides an integral non-combustible Class A flexible thermal insulation duct, comprising an outer layer, a middle layer, and an inner layer. The inner layer has retaining rings installed at both ends of its inner ring, and limiting rings are installed in an array within the inner ring. A locking mechanism is installed at each limiting ring. A spring frame is installed between the middle layer and the outer layer. The outer layer is divided into a connecting end and a sealing end. A sealing mechanism is installed at the connecting end. When the retaining rings at both ends approach each other, the locking mechanism causes the spring frame to unfold. The connecting end is magnetically attracted by the locking mechanism, and the sealing mechanism seals adjacent connecting ends under the action of the locking mechanism.

[0010] By simply splicing the end clips, the duct can automatically unfold and lock in place, eliminating the need for laborious manual stretching. Its self-supporting nature also reduces the need for additional auxiliary support structures such as hangers and brackets. Furthermore, the use of magnetic adsorption for initial pipe connection simplifies the process, saves installation time, and improves installation accuracy.

[0011] The outer layer is made of fiberglass cloth sheath, the middle layer is a flexible thermal insulation core material, and the inner layer is a coated fiberglass cloth layer.

[0012] By ensuring that the core materials of the outer, middle, and inner three-layer structure are all non-combustible, the air duct is protected as a whole, eliminating fire hazards at the source and improving the building's fire safety.

[0013] The retaining ring is divided into a head ring and a bottom ring. The locking mechanism includes a sliding groove, a hollow groove, a limiting groove, and a limiting block. The sliding groove is opened on the inner side of the head ring, the hollow groove is opened on the limiting ring, the limiting groove is opened on the inner side of the bottom ring, and the limiting block is installed on the head ring and slides within the limiting groove.

[0014] In the initial non-working state, the limiting block connected to the head ring is locked in the limiting groove through the connection of the sliding groove, the empty groove and the limiting groove, thereby locking the head ring, the limiting ring and the bottom ring, thus achieving radial constraint on the duct under compression, without occupying space or requiring additional accessories; in addition, this fixing method facilitates the relocation of the duct position and improves the ease of duct installation.

[0015] The sealing mechanism includes a magnetic block, a magnet, a sealing ring, a return spring, and a compression spring. The magnetic block is installed on the outside of the bottom ring, the magnet is installed in the slide groove, the magnet is in contact with the limiting block, the sealing ring is connected to the magnet, the return spring is installed between the magnet and the head ring, and the compression spring is installed between the limiting block and the head ring.

[0016] Under the action of the elastic frame, the bottom ring and the limiting ring will gradually unfold, thereby realizing the unfolding of the air duct. At this time, the return spring will drive the magnet to move back to the initial position. After the limiting block passes the magnet, the magnet squeezes out and locks the limiting block, thus realizing the convenient installation of the air duct. The setting of the magnetic block and magnet not only simplifies the docking process, but also provides the initial connection force, thereby linking the compression action of the sealing ring with the movement of the limiting block of the locking mechanism, thus ensuring the magnitude and uniformity of the sealing force. The return spring realizes the reusability of the mechanism, realizing quick disassembly and installation without affecting the sealing performance.

[0017] The spring skeleton is a variable pitch helical structure, with the pitch of the spring skeleton near both ends of the retaining ring being smaller than the pitch of the middle part of the spring skeleton.

[0018] The closer thread pitch at both ends enhances the rigidity and deformation resistance of the duct ends. This prevents deformation at the duct ends during connection, thereby improving the accuracy of the snap ring engagement and preventing air leakage caused by port collapse. Different thread pitch distributions achieve different stress distributions, concentrating stress at the rigider ends. This avoids stress concentration points when the duct is unfolded, compressed, and subjected to wind pressure, thus extending the service life of the spring frame.

[0019] The inner layer of coated glass fiber cloth has several guide ribs integrally formed along its length; the guide ribs arranged along the length can sort and guide the airflow, suppress lateral or swirling turbulence, and promote smoother axial flow of airflow, thereby reducing airflow pressure loss.

[0020] A double-lip sealing structure is adopted. The first lip extends outward towards the connection end, while the second lip extends inward towards the connection end. When the two sections of the duct are joined and the sealing ring is pressed, the first and second lips will cover the inner and outer sides of the duct connection, respectively, forming a double seal to ensure the airtightness of the connection point.

[0021] The sealing end includes a sealing body, a symmetrical zipper, a zipper head, a pressure rod, a push rod, and a sealing edge. The sealing body is hinged to the outer layer. The symmetrical zipper is installed on the edge of the sealing body and the outer layer. The zipper head is located at the symmetrical zipper. The pressure rod is installed above the front end of the zipper head. The push rod is installed below the front end of the zipper head. The sealing edge is installed on the outside of the symmetrical zipper.

[0022] While achieving a seal, it can prevent the sealing edge from getting stuck between the symmetrical zippers, thus affecting the opening and closing of the symmetrical zippers. After the symmetrical zippers are fully closed, this edge can cover the symmetrical zippers like a lid, further preventing air leakage and protecting the symmetrical zippers.

[0023] The beneficial effects of this invention are as follows:

[0024] 1. This invention proposes an integral non-combustible, Class A flexible insulated air duct. Through simple splicing with end clamps, the duct automatically unfolds and locks itself, eliminating the need for laborious manual stretching. Magnetic adsorption is used for initial pipe connection, simplifying the connection process, saving installation time, and improving installation accuracy. Furthermore, it achieves simultaneous connection and sealing; once the connection is locked, the sealing is completed simultaneously. This solves the problem of air leakage caused by forgetting to wrap tape or tighten hose clamps, ensuring the reliability and airtightness of the connection, thereby improving the overall operating efficiency of the air conditioning and ventilation system.

[0025] 2. The present invention proposes an integral non-combustible Class A flexible thermal insulation duct. The setting of magnetic blocks and magnets not only simplifies the docking process, but also provides initial connection force, thereby linking the compression action of the sealing ring with the movement of the limiting block of the locking mechanism, thus ensuring the magnitude and uniformity of the sealing force. The reset spring realizes the reusability of the mechanism, enabling quick disassembly and installation without affecting the sealing performance.

[0026] 3. The present invention proposes an integral non-combustible Class A flexible thermal insulation duct, which adopts a double-lip sealing structure. The first lip extends outward toward the connection end, while the second lip extends inward toward the connection end. When the two duct sections are joined and the sealing ring is pressed, the first and second lips will cover the inner and outer sides of the duct connection, respectively, forming a double-layer seal, thereby ensuring the airtightness of the connection point. In addition, the double-lip structure can also adapt to the positive and negative pressure difference changes inside and outside the duct. Regardless of whether the duct is under positive pressure supply or negative pressure return, one lip can always fit tightly against the cover, thus maintaining the sealing effect under various working conditions. Attached Figure Description

[0027] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are one embodiment of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2This is a schematic diagram of the half-section structure of the present invention;

[0030] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0031] Figure 4 This is a schematic diagram of the sealing mechanism of the present invention;

[0032] Figure 5 yes Figure 4 Enlarged view of point B in the middle;

[0033] Figure 6 yes Figure 4 Enlarged view of point C in the middle;

[0034] Figure 7 This is a schematic diagram of the capping end of the present invention;

[0035] Figure 8 This is a schematic diagram of the specific structure of the capping end of the present invention.

[0036] In the diagram: 1. Outer layer; 11. Connecting end; 12. Sealing end; 121. Sealing body; 122. Symmetrical zipper; 123. Zipper head; 124. Pressure rod; 125. Push rod; 126. Sealing edge; 2. Middle layer; 3. Inner layer; 31. Guide rib; 4. Snap ring; 41. Head ring; 42. Bottom ring; 5. Limiting ring; 6. Locking mechanism; 61. Slide groove; 62. Empty groove; 63. Limiting groove; 64. Limiting block; 7. Spring skeleton; 8. Sealing mechanism; 81. Magnetic block; 83. Magnet; 84. Sealing ring; 841. First lip; 842. Second lip; 85. Return spring; 86. Compression spring. Detailed Implementation

[0037] To better understand the above solution, the technical solution will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] like Figure 1-7 As shown, the present invention provides an integral non-combustible Class A flexible thermal insulation duct, comprising an outer layer 1, a middle layer 2, and an inner layer 3. The inner layer 3 has retaining rings 4 installed at both ends of its inner ring. Limiting rings 5 ​​are arrayed on the inner ring of the inner layer 3, and a locking mechanism 6 is installed at each limiting ring 5. A spring frame 7 is installed between the middle layer 2 and the outer layer 1. The outer layer 1 is divided into a connecting end 11 and a sealing end 12. A sealing mechanism 8 is installed at the connecting end 11. When the retaining rings 4 are close together, the locking mechanism 6 causes the spring frame 7 to unfold, and the connecting end 11 is magnetically attracted by the locking mechanism 6. The sealing mechanism 8 seals adjacent connecting ends 11 under the action of the locking mechanism 6.

[0039] When installers receive a compressed section of ductwork, they simply bring the head of the compressed duct close to the tail of the preceding duct. Magnetically, the two sections connect, and the compressed ductwork unfolds. This mechanism unlocks and releases the elastic potential energy stored in the spring frame 7, causing the entire duct to automatically spring out from its compressed state and extend into a pre-set, sufficiently rigid cylindrical pipe. Furthermore, once fully unfolded, the locking mechanism 6 engages in a predetermined position, keeping the ductwork in its unfolded state and allowing it to be self-supporting without additional supports. When connecting two duct sections, installers simply bring the connecting end 11 of one duct section close to the other. The locking mechanism 6 of the connecting end 11, or its linkage components, contains magnetic elements that automatically magnetically attract and align the sections, completing the initial physical connection. During this connection and locking process, the action of the locking mechanism 6 synchronously drives the sealing mechanism 8, activating and pressing it at the interface between the two duct sections to form a reliable seal.

[0040] By simply splicing the end rings (4), the duct can automatically unfold and lock relative to each other, eliminating the need for laborious manual stretching. Its self-supporting characteristics also reduce the need for additional support structures such as hangers and brackets (this doesn't mean they are completely eliminated; support structures are still required to maintain stability). Secondly, magnetic adsorption simplifies the initial pipe connection process, saving installation time and improving installation accuracy. Furthermore, it achieves simultaneous connection and sealing; once the connection is locked, the sealing is completed simultaneously. This solves the problem of air leakage caused by forgetting to wrap tape or tighten hose clamps, ensuring the reliability and airtightness of the connection, thereby improving the overall operating efficiency of the air conditioning and ventilation system and avoiding energy waste.

[0041] like Figure 1 , 2 As shown, the outer layer 1 is made of fiberglass cloth sheath, the middle layer 2 is a flexible thermal insulation core material, and the inner layer 3 is a coated fiberglass cloth layer.

[0042] This section specifies that the outer layer 1, middle layer 2, and inner layer 3 must all be made of specific high-performance non-combustible materials. The outer layer 1 uses a fiberglass cloth sheath, a tough, wear-resistant material with excellent fire resistance. The middle layer 2 uses a flexible insulation core material, such as specially treated glass wool or aerogel felt, which already meets the Class A non-combustible standard. The inner layer 3 uses a film-coated fiberglass cloth layer, which is a thin film added to the fiberglass cloth.

[0043] By ensuring that the core materials of the outer, middle, and inner three-layer structure are all non-combustible, the ductwork is guaranteed to function as a whole, rather than just a component, meeting the "overall non-combustible Class A" standard in national fire protection regulations. This eliminates fire hazards at the source and improves the building's fire safety. Specifically, the fiberglass cloth sheath not only provides fire resistance but also protects the internal insulation layer from physical damage during construction or in the environment. The Class A flexible insulation core material provides excellent thermal insulation, prevents energy loss and surface condensation, and ensures that it will not burn or produce toxic fumes in a fire. The inner layer 3, with its film-coated fiberglass cloth, has a fiberglass substrate that guarantees strength and non-combustibility, while the surface film creates a smooth inner wall that effectively reduces airflow resistance and noise, while also preventing fiber detachment from the insulation core material from entering the airflow, ensuring the cleanliness of the delivered air.

[0044] The outer layer 1 of the duct has an opening along its longitudinal axis. The edges of the opening are connected by opening and closing or sewing. The circumference of the duct is connected by symmetrical zippers 122. When the duct is used in places with higher requirements for air leakage, further sealing treatment is required at the duct connection and sewing positions.

[0045] like Figure 2-4 As shown, the retaining ring 4 is divided into a head ring 41 and a bottom ring 42. The locking mechanism 6 includes a sliding groove 61, a hollow groove 62, a limiting groove 63, and a limiting block 64. The sliding groove 61 is opened on the inner side of the head ring 41, the hollow groove 62 is opened on the limiting ring 5, the limiting groove 63 is opened on the inner side of the bottom ring 42, and the limiting block 64 is installed on the head ring 41 and slides within the limiting groove 63.

[0046] The retaining rings 4 at both ends of the duct are designed as a head ring 41 and a bottom ring 42 that can cooperate with each other. In the initial non-working state, the limiting block 64 connected to the head ring 41 is connected to the limiting groove 63 through the passage of the sliding groove 61, the empty groove 62 and the limiting groove 63, so that the limiting block 64 is locked in the limiting groove 63, thereby locking the head ring 41, the limiting ring 5 and the bottom ring 42, thus realizing the radial constraint of the duct under compression, without occupying space or requiring additional accessories; in addition, this fixing method can facilitate the relocation of the duct position and improve the ease of duct installation.

[0047] like Figure 2-6 As shown, the sealing mechanism 8 includes a magnetic block 81, a magnet 83, a sealing ring 84, a return spring 85, and a compression spring 86. The magnetic block 81 is installed on the outside of the bottom ring 42, the magnet 83 is installed in the slide groove 61, the magnet 83 is in contact with the limiting block 64, the sealing ring 84 is connected to the magnet 83, the return spring 85 is installed between the magnet 83 and the head ring 41, and the compression spring 86 is installed between the limiting block 64 and the head ring 41.

[0048] During docking, the permanent magnet block 81 installed on the bottom ring 42 will strongly attract the magnet 83 installed in the slide groove 61 of the head ring 41, realizing the quick alignment and fit of the two pipe openings. The magnet 83 is not fixed, but can move slightly in the slide groove 61. When the magnet block 81 attracts the magnet 83, the magnet 83 slides, which drives the limiting block 64 to release the limit. At this time, the compression spring 86 will push the limiting block 64 along the circumferential direction, thereby moving the limiting block 64 away from the limiting groove 63. At this time, under the action of the elastic frame, the bottom ring 42 and the limiting ring 5 will gradually unfold, thus realizing the unfolding of the air duct. At this time, the return spring 85 will drive the magnet 83 to move back to the initial position. After the limiting block 64 passes the magnet 83, the magnet 83 squeezes out the limiting block 64 to limit and lock it, thereby realizing the convenient installation of the air duct.

[0049] As the magnet 83 moves, the sealing ring 84 connected to the magnet 83 moves synchronously with the magnet 83, thereby causing the sealing ring 84 to block the connection of the air duct and achieve a sealing effect.

[0050] Traditional passive sealing relies mainly on manual operations after duct splicing. However, the location of the installed duct is often inconvenient for workers, making it difficult to fix and seal the duct. The sealing of this invention is completed automatically during installation. The setting of magnetic block 81 and magnet 83 not only simplifies the docking process but also provides initial connection force, thereby linking the compression action of sealing ring 84 with the movement of limit block 64 of locking mechanism 6, thus ensuring the magnitude and uniformity of sealing force. The return spring 85 enables the reusability of the mechanism, allowing for quick disassembly and installation without affecting the sealing performance.

[0051] The spring skeleton 7 is a variable pitch helical structure, and the pitch of the spring skeleton 7 near both ends of the retaining ring 4 is smaller than the pitch of the middle part of the spring skeleton 7.

[0052] Specifically, the springs near both ends of the duct (i.e., near the head ring 41 and bottom ring 42) have a small and dense pitch; while the springs in the main body of the duct have a large and sparse pitch, thereby enhancing the rigidity of the duct ends and improving the stability of the connection: the denser pitch at both ends enhances the rigidity and deformation resistance of the duct port. This makes the port less prone to deformation during duct connection, thereby improving the accuracy of the snap ring 4 engagement and providing the prerequisite for the uniform compression and expansion of the sealing mechanism 8, thus preventing air leakage due to port collapse.

[0053] The pitch of the middle section allows the duct to be compressed to a very small volume during storage and transportation. By distributing different pitches, different stresses are achieved, concentrating the stress at the two ends with greater rigidity. This prevents stress concentration points from forming when the duct is unfolded, compressed, and subjected to wind pressure, thereby extending the service life of the spring frame 7. It also prevents sagging or deformation caused by excessive weight at the ends and ensures the flatness and alignment of the connection.

[0054] The inner layer 3 has a plurality of guide ribs 31 integrally formed along its length on the coated glass fiber cloth layer.

[0055] In flexible ducts, especially in curved sections, airflow is prone to turbulence and eddies. This not only increases airflow resistance and fan energy consumption but also generates additional aerodynamic noise. These guide ribs 31, arranged along the length, can streamline and guide the airflow, suppress lateral or swirling turbulence, and promote smoother axial flow, thereby reducing airflow pressure loss. The guide ribs 31 are bendable, and the specific bending position varies depending on the direction of the duct bend; the figure shows a straight-through configuration.

[0056] The sealing ring 84 is a double-lip sealing structure, which includes a first lip 841 extending outward toward the connecting end 11 and a second lip 842 extending inward toward the connecting end 11.

[0057] A double-lip sealing structure is adopted. The first lip 841 extends outward toward the connecting end 11, while the second lip 842 extends inward toward the connecting end 11. When the two sections of the duct are joined and the sealing ring 84 is pressed tightly, the first lip 841 and the second lip 842 will cover the inner and outer sides of the duct connection respectively, forming a double-layer seal, thereby ensuring the airtightness of the connection point. In addition, the double-lip structure can also adapt to the positive and negative pressure difference changes inside and outside the duct. No matter whether the duct is positive pressure supply or negative pressure return, there is always one lip that can fit tightly against the cover, thus maintaining the sealing effect under various working conditions.

[0058] like Figure 7-8 As shown, the sealing end 12 includes a sealing body 121, a symmetrical zipper 122, a zipper head 123, a pressure rod 124, a push rod 125, and a sealing edge 126. The sealing body 121 is hinged to the outer layer 1. The symmetrical zipper 122 is installed on the edge of the sealing body 121 and the outer layer 1. The zipper head 123 is located at the symmetrical zipper 122. The pressure rod 124 is installed above the front end of the zipper head 123. The push rod 125 is installed below the front end of the zipper head 123. The sealing edge 126 is installed on the outside of the symmetrical zipper 122.

[0059] The cover 121 is connected to the main body of the duct via a hinge, making it easy to carry. Opening and closing are achieved by pulling the zipper head 123 of the symmetrical zipper 122. To address the poor sealing performance of ordinary symmetrical zippers 122, a pressure rod 124 and a push rod 125 are added in front of the zipper head 123. When the zipper head 123 is pulled to close, the pressure rod 124, located above the zipper head 123, gradually smooths out the already traveled sealing edge 126, while the push rod 125, located below the zipper head 123, gradually cleans impurities around the symmetrical zipper 122. Simultaneously, it controls the contact area between the symmetrical zipper 122 and the sealing edge 126, thus achieving a seal while preventing the sealing edge 126 from sinking into the symmetrical zipper 122, which would affect its opening and closing. After the symmetrical zipper 122 is fully closed, this edge can cover the symmetrical zipper 122 like a lid, further preventing air leakage and protecting the symmetrical zipper 122.

[0060] The symmetrical zipper 122 cap design is more convenient than traditional metal pipe caps, and solves the problem of symmetrical zippers 122 being difficult to tighten and not sealing properly on flexible materials, thus ensuring the quality of closure; the external sealing edge 126 ensures that the overall airtightness of the cap end 12 is no less than that of the pipe itself, thus improving the overall sealing performance.

[0061] When the duct needs to be installed and unfolded, the installer brings the head ring 41 of a compressed section of the duct close to a fixed point or the bottom ring 42 of a previously installed section of the duct. The magnet 83 installed in the head ring 41 will be attracted by the magnetic block 81 on the bottom ring 42. At this time, the magnetic block 81 strongly attracts the magnet 83 through magnetic force. This action not only achieves the alignment and fit of the two ends, but also causes the attracted magnet 83 to be displaced in the slide groove 61. This displacement will unlock the limiting block 64 that is limited by the magnet 83, pushing the limiting block 64 out of its locked position in the limiting groove 63.

[0062] Then, the unlocked limiting block 64, pushed by the pre-stored elastic compression spring 86, will quickly slide along its limiting groove 63, completely breaking free from the constraint of the limiting ring 5. At this time, the released limiting ring 5 will lose its restraint on the head ring 41 and the bottom ring 42, thereby allowing the spring frame 7 bound by it to be released instantly. The elastic restoring force of the spring frame 7 will drive the entire duct body to automatically spring out from the compressed state and extend into a cylindrical pipe of a preset length with sufficient rigidity. At this time, the sealing ring 84 will follow the axial displacement of the magnet 83, thereby reaching the connection point of the two duct clamping rings 4, and then tightly pressing it against the connection gap in an inner and outer wrapping manner.

[0063] For the end cap of the duct, when it is necessary to close the end of the duct, the operator pulls the zipper head 123 on the cap body 121. At this time, the push rod 125 below the front end of the zipper head 123 will pre-clean and lift the sealing edge 126 next to the track of the symmetrical zipper 122, ensuring that the symmetrical zipper 122 closes smoothly. At the same time, the pressure rod 124 above the front end of the zipper head 123 will follow closely behind, pressing the sealing edge 126 evenly and flatly and sticking it to the outside of the closed symmetrical zipper 122. Thus, while achieving rapid closure, the gap of the symmetrical zipper 122 is efficiently sealed.

[0064] The foregoing has shown and described the basic principles and beneficial effects of the present invention. However, the present invention is not limited to the above embodiments. Various changes and modifications can be made to the present invention without departing from its effects and scope. All such changes and modifications fall within the scope of the present invention as claimed, which is defined by the appended claims and their equivalents.

Claims

1. A type of integral non-combustible, Class A flexible thermal insulation duct, characterized in that: It includes an outer layer (1), a middle layer (2) and an inner layer (3). The inner layer (3) has retaining rings (4) installed at the beginning and end of its inner ring. The inner ring array of the inner layer (3) has limiting rings (5) installed. A locking mechanism (6) is installed at the limiting rings (5). A spring frame (7) is installed between the middle layer (2) and the outer layer (1). The outer layer (1) is divided into a connecting end (11) and a sealing end (12). A sealing mechanism (8) is installed at the connecting end (11). When the retaining rings (4) at the beginning and end approach each other, the locking mechanism (6) drives the spring frame (7) to unfold. The connecting end (11) is magnetically attracted by the locking mechanism (6). The sealing mechanism (8) seals the adjacent connecting end (11) under the action of the locking mechanism (6).

2. The integral non-combustible Class A flexible thermal insulation duct according to claim 1, characterized in that: The outer layer (1) is made of fiberglass cloth sheath, the middle layer (2) is a flexible thermal insulation core material, and the inner layer (3) is a coated fiberglass cloth layer.

3. The integral non-combustible Class A flexible thermal insulation duct according to claim 1, characterized in that: The retaining ring (4) is divided into a head ring (41) and a bottom ring (42). The locking mechanism (6) includes a sliding groove (61), a hollow groove (62), a limiting groove (63), and a limiting block (64). The sliding groove (61) is opened on the inner side of the head ring (41), the hollow groove (62) is opened on the limiting ring (5), the limiting groove (63) is opened on the inner side of the bottom ring (42), and the limiting block (64) is installed on the head ring (41). The limiting block (64) slides within the limiting groove (63).

4. The integral non-combustible Class A flexible thermal insulation duct according to claim 3, characterized in that: The sealing mechanism (8) includes a magnetic block (81), a magnet (83), a sealing ring (84), a return spring (85), and a compression spring (86). The magnetic block (81) is installed on the outside of the bottom ring (42), the magnet (83) is installed in the slide groove (61), the magnet (83) is in contact with the limiting block (64), the sealing ring (84) is connected to the magnet (83), the return spring (85) is installed between the magnet (83) and the head ring (41), and the compression spring (86) is installed between the limiting block (64) and the head ring (41).

5. The integral non-combustible Class A flexible thermal insulation duct according to claim 2, characterized in that: The spring skeleton (7) is a variable pitch helical structure, and the pitch of the spring skeleton (7) near the two ends of the retaining ring (4) is smaller than the pitch of the middle part of the spring skeleton (7).

6. The integral non-combustible Class A flexible thermal insulation duct according to claim 2, characterized in that: The inner layer (3) has several guide ribs (31) integrally formed along its length on the coated glass fiber cloth layer.

7. The integral non-combustible Class A flexible thermal insulation duct according to claim 4, characterized in that: The sealing ring (84) is a double-lip sealing structure, which includes a first lip (841) extending outward toward the connecting end (11) and a second lip (842) extending inward toward the connecting end (11).

8. The integral non-combustible Class A flexible thermal insulation duct according to claim 1, characterized in that: The sealing end (12) includes a sealing body (121), a symmetrical zipper (122), a zipper head (123), a pressure bar (124), a push bar (125), and a sealing edge (126). The sealing body (121) is hinged to the outer layer (1). The symmetrical zipper (122) is installed on the edge of the sealing body (121) and the outer layer (1). The zipper head (123) is located at the symmetrical zipper (122). The pressure bar (124) is installed above the front end of the zipper head (123). The push bar (125) is installed below the front end of the zipper head (123). The sealing edge (126) is installed on the outside of the symmetrical zipper (122).

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