Butt joint structure of air duct

Abstract

The application belongs to the technical field of air ducts, and particularly relates to a butt joint structure of an air duct, which comprises a pipe body, a butt joint edge and a mounting structure. The pipe body comprises an outer wall layer, an inner wall layer and a thermal insulation interlayer between the outer wall layer and the inner wall layer. The butt joint edge comprises a first convex edge and a second convex edge, which are respectively arranged at two ends of the pipe body. The mounting structure is arranged on the butt joint edge and used for connecting and fixing the first convex edge and the second convex edge. The mounting structure is provided with a plurality of beneficial effects of the application. The air duct is effectively enhanced in butt joint fastening through stress dispersion of the plurality of mounting structures and double locking.

Description

Technical Field

[0001] This application belongs to the field of duct technology, and in particular relates to a duct connection structure. Background Technology

[0002] Composite ducts, represented by rubber-plastic composite ducts, are a type of rubber-plastic composite duct system made of rubber-plastic composite insulation material. In air conditioning supply and exhaust systems, they can completely replace traditional ducts, air valves, air outlets, static pressure boxes, and insulation materials.

[0003] During duct installation, connections are typically secured using bolts. This involves drilling bolt holes in the flanges at the duct ends and then threading bolts through these holes to connect the two duct sections. However, this method of relying solely on bolts has limitations. During duct operation, airflow generates vibrations, which can lead to bolt loosening over time. Loose bolts create gaps at the duct joints, affecting the ventilation system's seal, causing airflow loss, and potentially generating noise due to airflow disturbances in the gaps. Therefore, improvements are needed. Utility Model Content

[0004] The purpose of this application is to provide a duct connection structure that can solve the above-mentioned problems.

[0005] The purpose of this application is to provide a duct connection structure, including:

[0006] The pipe body includes an outer wall layer and an inner wall layer, as well as an insulation interlayer located between the outer wall layer and the inner wall layer;

[0007] The mating edges include a first convex edge and a second convex edge, which are located at both ends of the tube body, respectively.

[0008] The mounting structure is located on the mating edge and is used to connect and fix the first convex edge and the second convex edge.

[0009] There are multiple installation structures.

[0010] The aforementioned duct connection structure employs a composite structure of an outer wall layer, an inner wall layer, and an insulation interlayer. This not only enhances the overall structural strength and improves the duct's resistance to deformation but also effectively reduces heat exchange between the airflow inside the duct and the external environment through the insulation interlayer, thus reducing energy loss. Simultaneously, the combination of the double-walled structure and the interlayer reduces the outward transmission of noise generated during airflow, improving the quietness of the ventilation system. Furthermore, this structural design makes the duct less prone to cracking due to external forces or temperature changes during long-term use, extending its service life.

[0011] The first and second convex edges of the mating joint are located at both ends of the duct body, providing a clear reference for the connection of the two duct sections. This ensures precise alignment of the axes of the two duct sections during connection, preventing uneven local stress caused by misalignment. The convex edge structure increases the contact area at the joint, allowing the connection force to be distributed more evenly on the convex edge, reducing deformation at the joint edge due to excessive local stress. It also provides a mounting platform for the installation structure, ensuring the reliability of subsequent fixing operations.

[0012] Meanwhile, in this application, multiple installation structures are provided, which can distribute the force at the joint of the two duct sections to multiple points, avoiding loosening of the connection due to excessive force at a single point. The multiple installation structures work together to constrain the first and second convex edges from different positions, enhancing the overall rigidity of the joint. Even in long-term vibration environments, this can reduce connection failures caused by local force imbalance, further improving the stability of the duct joint.

[0013] Furthermore, the mounting structure includes:

[0014] A positioning protrusion is provided on the first protruding edge;

[0015] The first positioning hole is provided on the first protruding edge and extends upward through the positioning protrusion;

[0016] The second positioning hole is provided on the second protruding edge;

[0017] Fastening components, including fasteners and fastening nuts;

[0018] The threaded end of the fastener passes through the first positioning hole and the second positioning hole and then engages with the fastening nut.

[0019] The positioning protrusions in the mounting structure, in conjunction with the first and second positioning holes, enable rapid positioning of the two duct sections during initial installation, reducing adjustment time and ensuring that fasteners are precisely inserted into the corresponding holes, preventing installation difficulties or loose connections due to misalignment. The fasteners of the fixing components, in conjunction with the fastening nuts, form a stable locking force through a threaded connection. Compared to simple bolt fixing, the guiding effect of the positioning protrusions and positioning holes ensures the locking force conforms more closely to the mating surfaces, improving the connection's sealing and reducing the risk of airflow leakage.

[0020] Furthermore: the fastener includes:

[0021] The rod has a threaded head at one end and a limiting head at the other end;

[0022] A limit ring is installed on the rod.

[0023] The mounting cap is movably mounted on the rod and located between the limiting ring and the limiting head;

[0024] The thread length of the threaded head is one-third that of the shank.

[0025] In this application, the fastener's shank is equipped with a threaded head and a limiting head at both ends. The limiting head prevents the fastener from falling out of the hole, improving the safety and convenience of the installation process. The limiting ring restricts the fastener's range of motion on the shank, preventing it from going too deep or shifting, ensuring precise locking. The mounting cap is movably mounted on the shank and can be adjusted according to the mating situation, forming a double constraint with the limiting ring to enhance the fastener's stability. The threaded head is one-third the length of the shank, ensuring an effective mating length with the fastening nut while avoiding installation redundancy caused by excessively long threads, making the locking operation more efficient, and reducing the area of ​​the threads exposed to the external environment for corrosion.

[0026] Furthermore, the mounting cap is provided with an internal thread, and the positioning protrusion is provided with an external thread, and the mounting cap and the positioning protrusion are connected by threads.

[0027] The mounting cap and positioning protrusion are connected by threads, which further enhances the connection strength after the fasteners and nuts are initially tightened. The threaded fit ensures a tight seal between the mounting cap and positioning protrusion, creating a secondary locking effect that effectively resists loosening caused by duct vibration. Simultaneously, the threaded connection's sealing properties reduce the entry of moisture and dust into the positioning hole, protecting the fasteners from corrosion and extending their service life. This double-locking structure ensures a more durable and reliable connection, reducing the frequency of future maintenance.

[0028] Furthermore, a blocking inner ring is provided on the inner wall of the second positioning hole, and an elastic element is provided between the blocking inner ring and the limiting ring, with the elastic element sleeved on the outside of the rod.

[0029] The elastic element between the inner blocking ring and the limiting ring on the inner wall of the second positioning hole generates a continuous preload after clamping. This preload counteracts the gaps caused by vibration during duct operation, maintaining the fasteners in a locked state and preventing loosening due to vibration. The elasticity of the element has a buffering effect, absorbing some vibration energy, reducing the impact of vibration on the overall connection structure, and reducing fatigue damage at the joint caused by long-term vibration. Simultaneously, the continuous preload ensures that the first and second protruding edges remain tightly fitted, guaranteeing the seal at the joint and reducing airflow loss. Furthermore, during disassembly, the elastic element provides a restoring force to assist in disassembly. Here, the elastic element is a spring.

[0030] Furthermore, the diameter of the rod is smaller than the inner diameter of the second positioning hole and the first positioning hole, and the center of the blocking inner ring is provided with a through hole for the rod to pass through, the diameter of which is larger than the diameter of the rod.

[0031] The diameter of the shank is smaller than the inner diameters of the second and first positioning holes, and the diameter of the through hole of the inner retaining ring is larger than the diameter of the shank. This avoids direct contact and friction between the shank and the hole wall, protecting the threads on the shank surface from wear. This ensures the integrity of the threads, maintaining a reliable fit between the fastener and the nut, and preventing a decrease in locking force due to thread wear. Simultaneously, the gap between the shank and the hole wall provides space for fine-tuning during installation, facilitating precise installation even with minor misalignments, reducing component damage caused by forced installation, and extending the overall structure's service life.

[0032] The beneficial effects of this application are:

[0033] 1. By distributing the force through multiple installation structures and combining double locking, the tightness of the duct connection is effectively enhanced;

[0034] 2. By providing continuous preload through elastic elements, the locking effect can be improved, and disassembly can be assisted, thereby increasing the disassembly speed.

[0035] 3. The diameter of the rod is smaller than the inner diameter of the second positioning hole and the first positioning hole, and the diameter of the inner ring through hole is larger than the diameter of the rod, which can prevent the rod from directly contacting and rubbing against the hole wall, and protect the threads on the surface of the rod from wear. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the structure of this utility model;

[0037] Figure 2 This is a structural schematic diagram of the fixing component of this utility model;

[0038] Figure 3 This is a side view of the present invention;

[0039] Figure 4 yes Figure 3 A cross-sectional view along the AA direction;

[0040] Figure 5 yes Figure 4 A magnified view of A in the middle.

[0041] The reference numerals in the figure are as follows: 100, pipe body; 210, outer wall layer; 220, inner wall layer; 230, insulation interlayer; 400, butt joint edge; 410, first convex edge; 420, second convex edge; 500, mounting structure; 510, positioning protrusion; 520, first positioning hole; 530, second positioning hole; 540, fastener; 541, rod; 542, threaded head; 543, limiting head; 544, limiting ring; 545, mounting cap; 550, fastening nut; 560, blocking inner ring; 570, elastic element. Detailed Implementation

[0042] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0043] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0044] The docking structure of the air duct provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0045] Example 1:

[0046] like Figures 1 to 5 As shown in the figure, this application embodiment provides a duct docking structure, including:

[0047] The pipe body 100 includes an outer wall layer 210 and an inner wall layer 220, and an insulation interlayer 230 located between the outer wall layer 210 and the inner wall layer 220;

[0048] The mating edge 400 includes a first protruding edge 410 and a second protruding edge 420, which are located at both ends of the tube body 100, respectively;

[0049] The mounting structure 500 is set on the mating edge 400 and is used to connect and fix the first protruding edge 410 and the second protruding edge 420.

[0050] Among them, there are multiple installation structures 500.

[0051] In some embodiments of this application, such as Figure 1As shown, the ductwork using the aforementioned connection structure employs a composite structure of an outer wall layer 210, an inner wall layer 220, and an insulation interlayer 230. This not only enhances the overall structural strength and improves the duct's resistance to deformation, but also effectively reduces heat exchange between the airflow inside the duct and the external environment through the insulation interlayer 230, thus reducing energy loss. Simultaneously, the combination of the double-walled structure and the interlayer reduces the outward transmission of noise generated during airflow, improving the quietness of the ventilation system. Furthermore, this structural design makes the ductwork 100 less prone to cracking due to external forces or temperature changes during long-term use, extending its service life.

[0052] The first convex edge 410 and the second convex edge 420 of the mating edge 400 are located at both ends of the duct body 100, respectively. They provide a clear reference for the mating of the two duct sections, ensuring precise alignment of the axes of the two duct sections during mating and avoiding uneven local stress caused by misalignment. The convex edge structure increases the contact area at the mating point, making the connection force more evenly distributed on the convex edge, reducing deformation of the mating edge 400 due to excessive local stress, and providing an installation carrier for the installation structure 500, ensuring the reliability of subsequent fixing operations.

[0053] Meanwhile, in this application, multiple installation structures 500 are provided, which can distribute the force at the joint of the two duct sections to multiple points, avoiding loosening of the connection due to excessive force at a single point. The multiple installation structures 500 work together to constrain the first protruding edge 410 and the second protruding edge 420 from different positions, enhancing the overall rigidity of the joint. Even in a long-term vibration environment, it can reduce connection failure caused by local force imbalance, further improving the stability of the duct joint.

[0054] Example 2:

[0055] This application provides a duct docking structure. In addition to the above-mentioned technical features, the duct docking structure of this application also includes the following technical features.

[0056] like Figure 2 and Figure 5 As shown, the mounting structure 500 includes:

[0057] The positioning protrusion 510 is set on the first protruding edge 410;

[0058] The first positioning hole 520 is provided on the first protruding edge 410 and extends upward through the positioning protrusion 510;

[0059] The second positioning hole 530 is provided on the second protruding edge 420;

[0060] The fastening components include fastener 540 and fastening nut 550;

[0061] The threaded end of the fastener 540 passes through the first positioning hole 520 and the second positioning hole 530 and then engages with the fastening nut 550.

[0062] In this embodiment, the positioning protrusion 510 in the mounting structure 500 cooperates with the first positioning hole 520 and the second positioning hole 530, enabling rapid positioning of the two duct sections in the initial stage of installation, reducing adjustment time during installation, and ensuring that the fastener 540 is accurately inserted into the corresponding hole, avoiding installation difficulties or loose connections due to hole misalignment. The fastener 540 of the fixing component cooperates with the fastening nut 550, forming a stable locking force through threaded connection. Compared with simple bolt fixing, the guiding effect of the positioning protrusion 510 and the positioning hole makes the locking force fit the mating surface more closely, improving the sealing of the connection and reducing the risk of airflow leakage.

[0063] Example 3:

[0064] This application provides a duct docking structure. In addition to the above-mentioned technical features, the duct docking structure of this application also includes the following technical features.

[0065] like Figure 2 and Figure 5 As shown, fastener 540 includes:

[0066] The rod 541 has a threaded head 542 at one end and a limiting head 543 at the other end;

[0067] A limiting ring 544 is provided on the rod 541;

[0068] The mounting cap 545 is movably mounted on the rod 541 and located between the limiting ring 544 and the limiting head 543;

[0069] The thread length of the threaded head 542 is one-third of that of the shank 541.

[0070] In this embodiment, the fastener 540 has a threaded head 542 and a limiting head 543 at both ends of the rod 541. The limiting head 543 prevents the fastener 540 from falling out of the hole, improving the safety and convenience of the installation process. The limiting ring 544 restricts the range of motion of the fastener 540 in the rod 541, preventing it from going too deep or shifting, and ensuring accurate locking. The mounting cap 545 is movably mounted on the rod 541 and can be adjusted according to the mating situation. Together with the limiting ring 544, it forms a double constraint, enhancing the stability of the fastener 540. The threaded head 542 is one-third the length of the rod 541, ensuring an effective mating length with the fastening nut 550 while avoiding installation redundancy caused by excessively long threads, making the locking operation more efficient, and reducing the area of ​​the threads exposed to the outside environment for corrosion.

[0071] Furthermore, the mounting cap 545 is provided with internal threads, and the positioning protrusion 510 is provided with external threads. The mounting cap 545 and the positioning protrusion 510 are connected by threads.

[0072] The mounting cap 545 and the positioning protrusion 510 are connected by threads, which further enhances the connection strength after the fastener 540 and the fastening nut 550 are initially tightened. The threaded engagement ensures a tight fit between the mounting cap 545 and the positioning protrusion 510, creating a secondary locking effect that effectively resists loosening caused by duct vibration. Simultaneously, the threaded connection's sealing properties reduce the entry of moisture and dust into the positioning hole, protecting the fastener 540 from corrosion and extending its service life. This double-locking structure ensures a more durable fastening at the joint, reducing the frequency of subsequent maintenance.

[0073] Example 4:

[0074] This application provides a duct docking structure. In addition to the above-mentioned technical features, the duct docking structure of this application also includes the following technical features.

[0075] like Figure 5 As shown, a blocking inner ring 560 is provided on the inner wall of the second positioning hole 530, and an elastic element 570 is provided between the blocking inner ring 560 and the limiting ring 544. The elastic element 570 is sleeved on the outside of the rod portion 541.

[0076] In this embodiment, the elastic element 570 between the blocking inner ring 560 and the limiting ring 544 on the inner wall of the second positioning hole 530 can generate a continuous preload after being pressed. This preload can offset the gap caused by vibration during duct operation, maintain the locked state of the fastener 540, and prevent loosening due to vibration. The elastic force of the elastic element 570 has a buffering effect, absorbing some vibration energy, reducing the impact of vibration on the overall connection structure, and reducing fatigue damage at the joint caused by long-term vibration. At the same time, the continuous preload keeps the first protrusion 410 and the second protrusion 420 tightly fitted, ensuring the sealing of the joint and reducing airflow loss. In addition, during disassembly, the elastic element 570 can also provide a restoring elastic force to assist disassembly. Here, the elastic element 570 is a spring.

[0077] Example 5:

[0078] This application provides a duct docking structure. In addition to the above-mentioned technical features, the duct docking structure of this application also includes the following technical features.

[0079] like Figure 5 As shown, the diameter of the rod 541 is smaller than the inner diameter of the second positioning hole 530 and the first positioning hole 520, and the center of the blocking inner ring 560 is provided with a through hole for the rod 541 to pass through, the diameter of the through hole being larger than the diameter of the rod 541.

[0080] In this embodiment, the diameter of the rod 541 is smaller than the inner diameters of the second positioning hole 530 and the first positioning hole 520, and the diameter of the through hole of the inner blocking ring 560 is larger than the diameter of the rod 541. This avoids direct contact and friction between the rod 541 and the hole wall, protecting the threads on the surface of the rod 541 from wear. This ensures the integrity of the threads, maintaining a reliable fit between the fastener 540 and the fastening nut 550, and preventing a decrease in locking force due to thread wear. Simultaneously, the gap between the rod 541 and the hole wall provides space for fine-tuning during installation, facilitating precise installation even with minor deviations in the connection, reducing component damage caused by forced installation, and extending the overall structure's service life.

[0081] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0082] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A connection structure for a duct, characterized in that: include: The pipe body (100) includes an outer wall layer (210) and an inner wall layer (220), and an insulation interlayer (230) located between the outer wall layer (210) and the inner wall layer (220); The mating edge (400) includes a first convex edge (410) and a second convex edge (420), which are located at both ends of the tube body (100); The mounting structure (500) is set on the mating edge (400) and is used to connect and fix the first protruding edge (410) and the second protruding edge (420); Multiple installation structures (500) are provided.

2. The duct connection structure according to claim 1, characterized in that: The mounting structure (500) includes: A positioning protrusion (510) is provided on the first protruding edge (410); The first positioning hole (520) is provided on the first protruding edge (410) and extends upward through the positioning protrusion (510); The second positioning hole (530) is provided on the second protruding edge (420); The fastening components include fasteners (540) and fastening nuts (550); The threaded end of the fastener (540) passes through the first positioning hole (520) and the second positioning hole (530) and then engages with the fastening nut (550).

3. The duct connection structure according to claim 2, characterized in that: The fastener (540) includes: The rod (541) has a threaded head (542) at one end and a limiting head (543) at the other end; A limiting ring (544) is provided on the rod (541); The mounting cap (545) is movably mounted on the rod (541) and located between the limiting ring (544) and the limiting head (543); The thread length of the threaded head (542) is one-third that of the shank (541).

4. The duct connection structure according to claim 3, characterized in that: The mounting cap (545) is provided with an internal thread, and the positioning protrusion (510) is provided with an external thread. The mounting cap (545) and the positioning protrusion (510) are connected by threads.

5. The duct connection structure according to claim 3, characterized in that: A blocking inner ring (560) is provided on the inner wall of the second positioning hole (530), and an elastic element (570) is provided between the blocking inner ring (560) and the limiting ring (544). The elastic element (570) is sleeved on the outside of the rod (541).

6. The duct connection structure according to claim 5, characterized in that: The diameter of the rod (541) is smaller than the inner diameter of the second positioning hole (530) and the first positioning hole (520), and the center of the blocking inner ring (560) is provided with a through hole for the rod (541) to pass through, the diameter of the through hole being larger than the diameter of the rod (541).

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