H-shaped duct connector, manufacturing method and duct containing same

Abstract

This invention discloses an H-shaped duct connector, its manufacturing method, and a duct containing the same. The connector is integrally formed from a single sheet of connector material through continuous bending. It includes a first vertical plate, a first vertical overlapping section formed by bending and rolling back the upper end of the first vertical plate, a first horizontal plate formed by bending and extending the free end of the first vertical overlapping section, a second vertical fitting section formed by bending the free end of the first horizontal plate, and a second vertical plate formed by bending the free end of the second vertical fitting section. The first and second vertical plates respectively enclose the upper and lower sides of the first horizontal plate to form a first insertion groove and a second insertion groove. The lower end of the first vertical plate is bent and rolled back to form a first rolled edge, and the upper end of the second vertical plate is bent and rolled back to form a second rolled edge. By integrally bending and forming an H-shaped double-layer insertion structure, and with rolled edge reinforcement at the free end, the flash phenomenon generated during the fastener tightening process is effectively suppressed, ensuring the sealing reliability and system cleanliness of the horizontal connection of the duct.

Description

Technical Field

[0001] This invention relates to the field of duct technology, and in particular to an H-shaped duct connector, a manufacturing method thereof, and a duct containing the same. Background Technology

[0002] Air ducts are piping systems used for air transport and distribution, and are generally made of thin metal sheets or other materials. In air duct systems, when the side length of the duct is large, the width of a single sheet of sheet is insufficient to cover the entire duct surface, requiring multiple sheets to be spliced ​​together horizontally to widen the duct.

[0003] Existing technologies include solutions for splicing duct panels using H-shaped connectors (such as H-shaped reinforcing strips). However, existing H-shaped connectors are usually made of separate parts (such as splicing or welding multiple profiles) or extruded profiles, and are mostly fixed by adhesive bonding or only plug-in fitting, which has problems such as insufficient connection strength, poor sealing, and low construction efficiency.

[0004] More notably, the free end of the interlocking groove sidewall of this type of H-shaped connector is typically a cut surface of a single layer of sheet material. During installation, when operators tighten the duct sheet material into the interlocking groove using fasteners, the tightening torque applied by the fasteners is converted into an outward spreading force on the sidewalls of the interlocking groove, causing the free end of the sidewall to experience significant bending. When the bending stress exceeds the material's yield strength, the free end undergoes irreversible plastic deformation, manifesting as the edge curling and warping outward, forming what is commonly known as "flash." This flash not only poses a safety risk of scratching installers but also compromises the seal between the interlocking groove and the sheet material, leading to a sharp increase in air leakage from the duct.

[0005] Therefore, the above-mentioned prior art has at least the following technical problems: the free end of the insertion groove of the existing H-shaped connector is prone to flash warping after the fastener is tightened, which leads to a decrease in sealing performance, an increase in air leakage, and safety hazards and cleanliness risks; moreover, the connectors are mostly made of split molding or extruded profiles, resulting in low connection strength. Summary of the Invention

[0006] This application provides an H-shaped duct connector, a manufacturing method, and a duct containing the same, which solves the technical problems of existing H-shaped connectors where the free end of the insertion slot is prone to flash warping after the fasteners are tightened, resulting in decreased sealing performance, increased air leakage, safety hazards and cleanliness risks, and low connection strength. The application achieves the technical effects of suppressing flash warping, ensuring horizontal connection sealing, and improving connection reliability and cleanliness.

[0007] In a first aspect, embodiments of this application provide an H-shaped duct connector, the connector being integrally formed from a single sheet of connector material through continuous bending, comprising: The upper end of the first vertical plate is bent inward and rolled back to form a first vertical overlapping section that overlaps the inner side of the first vertical plate. The first horizontal plate is formed by bending and extending the free end of the first vertical overlapping section, and the free end of the first horizontal plate is bent to form the second vertical fitting section. The second vertical plate is formed by bending the free end of the second vertical fitting section. The second vertical plate is attached to the outer side of the second vertical fitting section, and the second vertical plate is spaced apart from the first vertical plate. The first vertical plate and the second vertical plate enclose each other above the first horizontal plate to form a first insertion groove; the first vertical plate and the second vertical plate enclose each other below the first horizontal plate to form a second insertion groove; The lower end of the first vertical plate is bent back to form a first rolled edge, and the upper end of the second vertical plate is bent back to form a second rolled edge.

[0008] Furthermore, the first vertical plate and the second vertical plate are parallel; The first horizontal plate is perpendicular to both the first vertical plate and the second vertical plate.

[0009] Furthermore, the first rolled edge is formed by bending and rolling back from the lower end of the first vertical plate toward the side facing the second vertical plate. The first rolled edge includes a first arc bending section and a first straight pressing section that fits against the inner side of the first vertical plate. The first arc bending section is an arc-shaped folding structure, and the first straight pressing section fits against the inner side of the first vertical plate.

[0010] Furthermore, the second rolled edge is formed by bending and rolling back from the upper end of the second vertical plate toward the side facing the first vertical plate. The second rolled edge includes a second arc-shaped bending section and a second straight pressing section that fits against the inner side of the second vertical plate. The second arc-shaped bending section is an arc-shaped folding structure, and the second straight pressing section fits against the inner side of the second vertical plate.

[0011] Furthermore, the first horizontal plate is formed by extending the free end of the first vertically stacked section by bending it 90° in the horizontal direction.

[0012] Furthermore, the second vertically fitting section is formed by bending the free end of the first horizontal plate downwards by 90°.

[0013] Furthermore, the second vertical plate is formed by folding the free end of the second vertical fitting section upwards by 180°, and the second vertical plate is closely fitted with the second vertical fitting section to jointly bear the load.

[0014] Furthermore, the upper end face of the second vertical plate is flush with the upper end face of the first vertical plate, and the lower end face of the second vertical plate is flush with the lower end face of the first vertical plate.

[0015] Secondly, embodiments of this application provide a method for manufacturing an H-shaped duct connector, comprising the following steps: The connector plate is bent for the first time, so that the upper end of the connector plate is folded back to its own inner side and fits into the inner surface of the connector plate to form the first vertical overlapping section. Starting from the free end of the first vertically stacked section, the connecting plate is bent horizontally at 90° to form the first horizontal plate; Starting from the free end of the first horizontal plate, the connecting plate is bent downwards at 90° to form the second vertical bonding section; Starting from the free end of the second vertical bonding section, the connecting plate is bent downwards by 90° to form a second vertical plate, so that the second vertical plate is parallel to the first vertical plate and its lower end face is flush. Starting from the lower end of the first vertical plate, make a 180° arc transition bend and roll back towards the side facing the second vertical plate to form the first rolled edge; Starting from the upper end of the second vertical plate, make a 180° arc transition bend and roll back towards the side facing the first vertical plate, and press to form the second rolled edge.

[0016] Thirdly, embodiments of this application provide a duct, characterized in that it includes: H-shaped duct connector as described in any of the first aspects; Two duct plates are respectively inserted into the first insertion slot and the second insertion slot of the H-shaped duct connector.

[0017] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages: 1. This application addresses the issue of the connector being integrally formed from a single sheet of connector material through continuous bending, featuring an H-shaped double-layer interlocking structure. Simultaneously, the lower end of the first vertical plate is bent back to form a first rolled edge, and the upper end of the second vertical plate is bent back to form a second rolled edge. This transforms the free ends of both interlocking slots from a single-layer sheet section to a double-layer composite thickened section, effectively doubling the thickness, significantly increasing the bending section modulus, and substantially increasing the moment of inertia. During fastener tightening, the tightening torque generates an outward expanding force on both sides of the interlocking slot, subjecting the free ends to bending. The rolled edge structure in this application ensures that each free end remains within the elastic deformation range during fastener tightening, fundamentally eliminating the mechanical conditions for plastic buckling deformation. This solves the technical problem of existing H-shaped connectors where the free ends of the interlocking slots easily develop flash warping after fastener tightening, leading to decreased sealing performance, increased air leakage, safety hazards, and cleanliness risks. This application achieves the effects of suppressing flash warping, ensuring horizontal connection sealing, and improving connection reliability and cleanliness. Meanwhile, the upper part of the first vertical plate is bent inward and rolled back to form the first vertical overlapping section, which provides a stable foundation for the cantilever of the first horizontal plate; the second vertical fitting section and the second vertical plate also form an overlapping structure, which are closely fitted and work together to bear the load, increasing the equivalent thickness of the lower part of the second vertical plate from a single layer to a double layer; the two overlapping structures and the two rolled edges symmetrically enhance the overall structural strength of the connector, the stiffness distribution is more uniform, and the fatigue resistance of the connector is further enhanced in long-term use.

[0018] 2. This application adopts a single sheet of connector material for continuous bending and integral forming, without the need for welding, splicing or extrusion forming. The processing steps are simplified, the production efficiency is high, the material utilization rate is high and the cost is low, which solves the technical problem that existing H-shaped connectors mostly use split forming or extruded profiles and have low connection strength.

[0019] 3. In this application, the first and second rolled edges are respectively set at the openings of the two insertion slots. The arc-shaped bend of the rolled edge forms a guide structure with an arc transition at the slot opening. When the duct plate is inserted, the end first contacts the arc-shaped bend, guiding the plate smoothly into the insertion slot. This effectively avoids insertion difficulties such as jamming and scratching caused by sharp or deformed slot edges, significantly reducing installation resistance and improving on-site construction efficiency. After the plate is inserted, the straight pressing section of the rolled edge fits against the side wall surface of the insertion slot, increasing the local effective thickness in the slot area. This forms a compression fixation on the inserted duct plate, making the plate more stable and less prone to shaking in the insertion slot, further ensuring the fit and seal between the insertion slot and the plate.

[0020] 4. In this application, coaxial fastening holes are respectively opened on the first and second vertical plates on both sides of the insertion slot. The fasteners pass through the fastening holes on both sides of the insertion slot to lock the duct plate in the insertion slot, so that the duct plate is symmetrically clamped and fixed in the insertion slot. The fastening force is evenly distributed on both sides of the plate, avoiding eccentric force or warping deformation of the plate caused by unilateral fixation, and enhancing the structural strength of the connection. At the same time, the edge of the plate in the drilling area is effectively constrained, avoiding the shedding of burrs and debris generated during drilling, and maintaining the cleanliness of the inside of the duct.

[0021] 5. The rolled edge of this application adopts a rounded roll structure, which eliminates the sharp burrs and micro-crack defects of the plate cutting edge, avoids the risk of scratches during installation and use, and prevents the inner wall of the air duct from shedding powder and slag due to edge wear, thus ensuring the air cleanliness of the air duct system.

[0022] 6. In this application, the first and second insertion slots are both rectangular cross-section through slots, and the two insertion slots are respectively arranged on the upper and lower sides of the first horizontal plate, forming an H-shaped symmetrical cross-section. This makes the force characteristics of the connector consistent in both the upper and lower directions. Regardless of whether the duct plate is inserted from the top or the bottom, the connector can provide the same clamping force and sealing effect, reducing the restriction on the installation direction and improving the flexibility of construction.

[0023] 7. In this application, the first vertical overlapping section serves as the starting foundation for the bending of the first horizontal plate, providing a stable foundation for the cantilever of the first horizontal plate; the second vertical bonding section also forms an overlapping structure with the second vertical plate, and the two are closely bonded and work together to bear the load, increasing the equivalent thickness of the lower area of ​​the second vertical plate from a single layer to a double layer; the two overlapping structures and the two rolled edges symmetrically enhance the overall structural strength of the connector, the stiffness distribution is more uniform, effectively avoids stress concentration caused by local stiffness abrupt changes, and further enhances the fatigue resistance of the connector in long-term use. Attached Figure Description

[0024] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0025] Figure 1 This is a perspective view of a corner connector for ductwork provided in one embodiment of this application; Figure 2 This is an end view of a corner connector for ductwork provided in one embodiment of this application; Figure 3 This is a side view of a duct corner connector provided in one embodiment of this application; Figure 4 This is a top view of a corner connector for ductwork provided in one embodiment of this application.

[0026] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0027] This application provides an H-shaped duct connector, a manufacturing method, and a duct containing the same, which solves the technical problems of existing H-shaped connectors where the free end of the insertion slot is prone to flash warping after the fasteners are tightened, resulting in decreased sealing performance, increased air leakage, safety hazards and cleanliness risks, and low connection strength. The application achieves the technical effects of suppressing flash warping, ensuring horizontal connection sealing, and improving connection reliability and cleanliness.

[0028] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0029] Example 1

[0030] Figures 1 to 4 As shown in the figure, this application provides an H-shaped duct connector for horizontally splicing two duct panels.

[0031] The H-shaped duct connector is formed by bending a single piece of galvanized steel sheet (or stainless steel sheet, aluminum sheet or other thin metal sheet with good bending performance in other embodiments) through multiple continuous bending. The whole is a strip-shaped profile extending along the length direction, without welds or splices, and its cross-section has an H-shaped double-layer plug-in structure.

[0032] like Figure 1 , Figure 2 As shown, the H-shaped duct connector includes a first vertical plate 10, which extends in a vertical direction.

[0033] The upper end of the first vertical plate 10 is bent and rolled back towards its own inner side (i.e., the side facing the second vertical plate 40 below) to form a first vertical overlapping section 11 that overlaps the inner side of the upper half of the first vertical plate 10. The first vertical overlapping section 11 is in contact and fits snugly with the inner side of the first vertical plate 10 without gaps. This overlapping structure increases the equivalent thickness of the upper region of the first vertical plate 10 from a single layer to a double layer, significantly improving the local bending stiffness.

[0034] The free end of the first vertical overlapping section 11 bends 90° to the right along the horizontal direction and extends to form the first horizontal plate 20. The first horizontal plate 20 extends along the horizontal direction and is perpendicular to the first vertical plate 10.

[0035] The free end of the first horizontal plate 20 is bent downwards at 90° to form a second vertically fitting section 30, which extends downwards in the vertical direction. The free end of the second vertically fitting section 30 is folded upwards at 180° to form a second vertical plate 40 that fits against the outer side of the second vertically fitting section 30 and extends upwards in the vertical direction. The second vertical plate 40 and the second vertically fitting section 30 are tightly fitted together and work together to bear the load.

[0036] The second vertical plate 40 is parallel to the first vertical plate 10 and is spaced apart from it. The upper end face of the second vertical plate 40 is flush with the upper end face of the first vertical plate 10, and the lower end face is flush with the lower end face of the first vertical plate 10.

[0037] At this point, the first vertical plate 10 and the second vertical plate 40 form an upward-opening first insertion slot 50 above the first horizontal plate 20, for inserting the first duct plate; the first vertical plate 10 and the second vertical plate 40 form a downward-opening second insertion slot 60 below the first horizontal plate 20, for inserting the second duct plate. Specifically: The first insertion slot 50 is formed by the inner side of the first vertical overlapping section 11, the inner side of the second vertical plate 40, and the upper surface of the first horizontal plate 20, and is a continuous slot with a rectangular cross-section. The second insertion slot 60 is formed by the inner side of the first vertical plate 10, the inner side of the second vertical fitting section 30, and the lower surface of the first horizontal plate 20, and is also a continuous slot with a rectangular cross-section. The two insertion slots are respectively arranged on the upper and lower sides of the first horizontal plate 20, forming an H-shaped cross-section.

[0038] In one embodiment of this application, as Figure 1 , Figure 2 As shown, the lower end of the first vertical plate 10 (i.e., at the opening of the second insertion slot 60) is bent inwards towards its inner side (i.e., towards the inside of the second insertion slot 60) to form a first rolled edge 12. The first rolled edge 12 starts from the free edge of the lower end of the first vertical plate 10, and first bends towards the inside of the second insertion slot 60 to form a first arc-shaped bending segment 121. This first arc-shaped bending segment 121 has an arc-shaped folding structure with a smooth transition and no sharp corners. Then, it continues to bend and extend from the free end of the first arc-shaped bending segment 121 to form a first straight pressing segment 122 that fits against the inner side of the first vertical plate 10. The first straight pressing segment is parallel to the inner side of the first vertical plate 10 and fits tightly against the inner side of the first vertical plate 10 without gaps.

[0039] Similarly, the upper end of the second vertical plate 40 (i.e., at the opening of the first insertion slot 50) is bent inwards towards its inner side (i.e., towards the inside of the first insertion slot 50) to form a second rolled edge 41. The second rolled edge 41 starts from the free edge of the upper end of the second vertical plate 40, first bending inwards towards the inside of the first insertion slot 50 to form a second arc-shaped bent section 411. This second arc-shaped bent section 411 has an arc-shaped folded structure with a smooth transition and no sharp corners. Then, it continues to extend from the free end of the second arc-shaped bent section 411 to form a second straight pressing section 412 that fits against the inner side of the second vertical plate 40. The second straight pressing section 412 is parallel to the inner side of the second vertical plate 40 and fits tightly against the inner side of the second vertical plate 40 without gaps.

[0040] After the duct panel is inserted, the first straight pressing section 122 and the second straight pressing section 412 of the first rolled edge 12 and the second rolled edge 41 respectively adhere to the first insertion groove 50 and the side wall surface, thereby increasing the local effective thickness of the groove area and forming a certain compression and fixation on the inserted duct panel, making the panel more stable and less prone to shaking in the insertion groove.

[0041] In one alternative embodiment, the H-shaped duct connector further includes fasteners (not shown in the figure).

[0042] Along the length of the profile, the first vertical plate 10 and the second vertical plate 40 have corresponding coaxially aligned first set of fastening holes in the portion of the first insertion groove 50 area. These holes are used to insert fasteners to lock the first duct plate material inserted into the first insertion groove 50. The fasteners are inserted from the outside of the first vertical plate 10, and sequentially pass through the fastening holes on the first vertical plate 10, the first duct plate material, and the corresponding coaxially aligned fastening holes on the second vertical plate 40 before being locked, thus stably fixing the first duct plate material in the first insertion groove 50.

[0043] Similarly, the portions of the first vertical plate 10 and the second vertical plate 40 located in the area of ​​the second insertion slot 60 are respectively provided with a second set of coaxially aligned fastening holes for fasteners to pass through and lock the second duct plate inserted into the second insertion slot 60. The fasteners are inserted from the outside of the first vertical plate 10, and pass through the fastening holes on the first vertical plate 10, the second duct plate, and the corresponding coaxially aligned fastening holes on the second vertical plate 40 in sequence before being locked, thus stably fixing the second duct plate in the second insertion slot 60.

[0044] Multiple sets of fastening holes can be arranged at intervals along the length of the profile as needed. The spacing between adjacent sets of fastening holes is preferably 100mm to 300mm to ensure connection strength and uniform sealing.

[0045] Because fastening holes are provided on both sides of the insertion slot (i.e., the first vertical plate 10 and the second vertical plate 40), the duct plate is symmetrically clamped and fixed in the insertion slot, avoiding the eccentric force caused by unilateral fixing. This not only enhances the structural strength of the connection, but also effectively restrains the edge of the plate in the drilling area, preventing burrs and debris from falling off during drilling and maintaining the cleanliness inside the duct.

[0046] During the installation of this duct connector, the operator uses fasteners to lock and secure the connector to the duct panel. The rotational torque applied to the fasteners (i.e., the "fastening torque") is converted into an axial clamping force, pressing the duct panel firmly into the insertion slot. Simultaneously, this clamping force generates an outward expanding component on the two side walls of the insertion slot, causing the free end of the side wall to bear an outward bending moment. If the free end is a single-layer panel, due to the typically small panel thickness and limited bending section modulus, the bending stress easily exceeds the material's yield strength, resulting in irreversible plastic deformation, manifested as outward curling and warping of the edges, i.e., the "flash" phenomenon.

[0047] In this application, the first rolled edge 12 and the second rolled edge 41 transform the corresponding free end portion from a single-layer cross-section to a double-layer composite cross-section—the two layers of the plate adhere to each other and share the load without relative slippage. During the bending and rewinding process, the straight pressing section is compacted by a mold, with no gap between the two layers. Under bending stress, they deform collaboratively, effectively doubling the thickness. The section modulus of bending increases exponentially, and the moment of inertia of the section also increases significantly. Therefore, under the same tightening torque, the maximum bending stress and deflection of the free end are significantly reduced. This mechanical advantage ensures that each free end remains within the elastic deformation range during the fastener tightening process, fundamentally eliminating the mechanical conditions for plastic buckling deformation and significantly reducing the probability of flash warping.

[0048] Meanwhile, the first vertical overlapping section 11 serves as a superimposed reinforcing structure at the upper end of the first vertical plate 10, providing stable support for the upper end of the first vertical plate 10. The equivalent thickness of the upper region increases from a single layer to a double layer, significantly improving the local bending stiffness. The second vertical bonding section 30 also forms a overlapping structure with the second vertical plate 40. The two are closely bonded and work together to bear the load, increasing the equivalent thickness of the lower region of the second vertical plate 40 from a single layer to a double layer, significantly improving the local bending stiffness. This symmetrically enhances the overall structural strength of the connector with the first vertical overlapping section 11.

[0049] In addition, the arc-shaped rewinding structure of the first rolled edge 12 and the second rolled edge 41 eliminates sharp burrs and micro-crack defects on the cut edge of the sheet metal, avoids the risk of scratches during installation and use, and prevents powder and slag from falling off the inner wall of the duct due to edge wear, thus ensuring the air cleanliness of the duct system.

[0050] In this application, the first rolled edge 12 and the second rolled edge 41 not only solve the aforementioned problem of burr warping, but also provide positive assistance to the insertion process of the duct panel. Specifically, the first rolled edge 12 and the second rolled edge 41 are located at the openings of the first insertion groove 50 and the second insertion groove 60, respectively. During panel insertion, the end of the duct panel first contacts the arc-shaped bend of the rolled edge. The smooth and continuous arc surface guides the panel smoothly into the insertion groove, effectively avoiding insertion difficulties such as jamming and scraping caused by sharp or deformed groove edges, significantly reducing installation resistance and improving on-site construction efficiency. After the panel is inserted, the straight pressing section of the rolled edge adheres to the side wall surface of the insertion groove, increasing the local effective thickness in the groove area. This provides a certain degree of compression and fixation to the inserted duct panel, making the panel more stable and less prone to shaking within the insertion groove, further ensuring a tight seal between the insertion groove and the panel.

[0051] A preferred method for manufacturing the connector described in this embodiment is as follows: S1: Forming the first vertical overlapping section 11. The flat metal connector sheet is bent for the first time along a first bending line extending along the length of the profile, so that the upper end of the connector sheet is folded inward and joined to the inner surface of the connector sheet, forming the first vertical overlapping section 11, with a bending angle of 180° arc rollback.

[0052] S2: Forming the first horizontal plate 20. Starting from the free end of the first vertical overlapping section 11, the connecting plate is bent horizontally at 90° along the second bending line to form the first horizontal plate 20.

[0053] S3: Forming the second vertical bonding section 30. Starting from the free end of the first horizontal plate 20, the connecting plate is bent downwards at 90° along the third bending line to form the second vertical bonding section 30.

[0054] S4: Form the second vertical plate 40. Starting from the free end of the second vertical bonding section 30, bend the connecting plate down 90° along the fourth bending line to form the second vertical plate 40, so that the second vertical plate 40 is parallel to the first vertical plate 10 and its lower end face is flush.

[0055] S5: Forming the first rolled edge 12. Starting from the lower end of the first vertical plate 10, make a 180° arc transition bend and roll back towards the side facing the second vertical plate 40, and press it with a mold to form the first rolled edge 12, so that the first straight pressing section is closely attached to the surface of the first vertical plate 10.

[0056] S6: Forming the second rolled edge 41. Starting from the upper end of the second vertical plate 40, make a 180° arc transition bend and roll back towards the side facing the first vertical plate 10, and press it with a mold to form the second rolled edge 41, so that the second straight pressing section 412 is tightly attached to the surface of the second vertical plate 40.

[0057] Example 2 This application embodiment provides a duct, the duct comprising: The H-shaped duct connector as described in Example 1; The first duct plate is inserted into the first insertion slot 50 of the H-shaped duct connector; The second duct plate is inserted into the second insertion slot 60 of the H-shaped duct connector.

[0058] In a preferred embodiment, the duct plate is a rectangular flat plate, and the first insertion groove 50 is a continuous groove with a rectangular cross-section. The upper surface, lower surface, and end face of the end of the duct plate are tightly fitted with the three inner wall surfaces of the first insertion groove 50, respectively. The second insertion groove 60 is also a continuous groove with a rectangular cross-section, and the three surfaces of the end of the duct plate are tightly fitted with the three inner wall surfaces of the second insertion groove 60, respectively.

[0059] Fasteners pass through the fastening holes on the first vertical plate 10, the duct plate, and the corresponding fastening holes on the second vertical plate 40 and are locked in place, so that the duct plate is fixed in the corresponding insertion slot.

[0060] It should be understood that although quantifiers such as "first," "second," etc., may be used herein to describe various units, these units should not be limited by these terms. These terms are used merely to distinguish one unit from another. For example, without departing from the scope of the exemplary embodiments, a first unit may be referred to as a second unit, and similarly, a second unit may be referred to as a first unit.

[0061] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to the structures shown in the accompanying drawings. They are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive.

[0062] The above description is merely a preferred embodiment of this application and is not intended to limit this application in any form or substance. It should be noted that those skilled in the art can make various improvements and additions without departing from the method of this application, and these improvements and additions should also be considered within the scope of protection of this invention. Any modifications, alterations, and equivalent variations made by those skilled in the art without departing from the spirit and scope of this application, based on the disclosed technical content, are equivalent embodiments of this application. Furthermore, any modifications, alterations, and variations made to the above embodiments based on the essential technology of this application still fall within the scope of the technical solution of this application.

Claims

1. An H-shaped duct connector, characterized in that, The connector is integrally formed from a single sheet of connector material through continuous bending, including: The upper end of the first vertical plate is bent inward and rolled back to form a first vertical overlapping section that overlaps the inner side of the first vertical plate. The first horizontal plate is formed by bending and extending the free end of the first vertical overlapping section, and the free end of the first horizontal plate is bent to form the second vertical fitting section. The second vertical plate is formed by bending the free end of the second vertical fitting section. The second vertical plate is attached to the outer side of the second vertical fitting section, and the second vertical plate is spaced apart from the first vertical plate. The first vertical plate and the second vertical plate enclose each other above the first horizontal plate to form a first insertion groove; the first vertical plate and the second vertical plate enclose each other below the first horizontal plate to form a second insertion groove; The lower end of the first vertical plate is bent back to form a first rolled edge, and the upper end of the second vertical plate is bent back to form a second rolled edge.

2. The H-shaped duct connector according to claim 1, characterized in that, The first vertical plate and the second vertical plate are parallel; The first horizontal plate is perpendicular to both the first vertical plate and the second vertical plate.

3. The H-shaped duct connector according to claim 1, characterized in that, The first rolled edge is formed by bending and rolling back from the lower end of the first vertical plate toward the side facing the second vertical plate. The first rolled edge includes a first arc bending section and a first straight pressing section that fits against the inner side of the first vertical plate. The first arc bending section is an arc-shaped folding structure, and the first straight pressing section fits against the inner side of the first vertical plate.

4. The H-shaped duct connector according to claim 1, characterized in that, The second rolled edge is formed by bending and rolling back from the upper end of the second vertical plate toward the side facing the first vertical plate. The second rolled edge includes a second arc-shaped bending section and a second straight pressing section that fits against the inner side of the second vertical plate. The second arc-shaped bending section is an arc-shaped folding structure, and the second straight pressing section fits against the inner side of the second vertical plate.

5. The H-shaped duct connector according to claim 1, characterized in that, The first horizontal plate is formed by extending the free end of the first vertically stacked section by bending it 90° in the horizontal direction.

6. The H-shaped duct connector according to claim 5, characterized in that, The second vertical fitting section is formed by bending the free end of the first horizontal plate downwards by 90°.

7. The H-shaped duct connector according to claim 6, characterized in that, The second vertical plate is formed by folding the free end of the second vertical fitting section upward by 180°. The second vertical plate and the second vertical fitting section are closely fitted and work together to bear the load.

8. The H-shaped duct connector according to claim 1, characterized in that, The upper end face of the second vertical plate is flush with the upper end face of the first vertical plate, and the lower end face of the second vertical plate is flush with the lower end face of the first vertical plate.

9. A method for manufacturing an H-shaped duct connector, characterized in that, Includes the following steps: The connector plate is bent for the first time, so that the upper end of the connector plate is folded back to its own inner side and fits into the inner surface of the connector plate to form the first vertical overlapping section. Starting from the free end of the first vertically stacked section, the connecting plate is bent horizontally by 90° to form the first horizontal plate; Starting from the free end of the first horizontal plate, the connecting plate is bent downwards at 90° to form the second vertical bonding section; Starting from the free end of the second vertical bonding section, the connecting plate is bent downwards by 90° to form a second vertical plate, so that the second vertical plate is parallel to the first vertical plate and its lower end face is flush. Starting from the lower end of the first vertical plate, make a 180° arc transition bend and roll back towards the side facing the second vertical plate to form the first rolled edge; Starting from the upper end of the second vertical plate, make a 180° arc transition bend and roll back towards the side facing the first vertical plate, and press to form the second rolled edge.

10. A type of air duct, characterized in that, include: H-shaped duct connector as described in any one of claims 1 to 8; Two duct plates are respectively inserted into the first insertion slot and the second insertion slot of the H-shaped duct connector.

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